ORCID Profile
0000-0003-3204-1416
Current Organisations
Real-Time and Embedded Computing Systems Research Centre (CISTER)
,
Guangzhou University
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Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA04131H
Abstract: The ionic liquid, tetramethylammonium hydroxide, was introduced into SnO 2 films to enhance the conductivity of both SnO 2 and overlying perovskite film for perovskite solar cells with efficiency exceeding 21%.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA02530G
Abstract: Layered HTi 2 NbO 7 displays excellent cycling stability as the anode in sodium ion batteries.
Publisher: AIP Publishing
Date: 04-02-2008
DOI: 10.1063/1.2840715
Abstract: Polyimide nanofoamed films have been prepared from the polyimide precursors (PMDA-ODA) and poly(ethylene oxide) (PEO) in N,N-dimethylacetamide. The dielectric properties of the films were studied over the temperature range of −150–150°C and a frequency range of 1Hz–10MHz. The frequency dependence of the dielectric constant for nanofoamed films with different amounts of PEO was studied. An relaxation process at below the glass transition temperature of the polyimide nanofoamed films was found. The peak value of the dielectric loss increased with increasing amount of PEO.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Elsevier BV
Date: 09-2021
Publisher: IEEE
Date: 11-2016
Publisher: Elsevier BV
Date: 06-2009
Publisher: AIP Publishing
Date: 04-2016
DOI: 10.1063/1.4947142
Abstract: In this paper, intrinsic and extrinsic factors dependent switching process in P(VDF-TrFE) thin films is investigated through time domain polarization measurements. The thinning-induced increase of switching time is observed for s les below 80 nm due to the surface oxide layer. For thinner s les the switchable polarization decreases with decreasing temperature since domain pinning prevails. Switching is faster using metal electrode with higher work function, which can be attributed to the lower depolarization field. Furthermore, the switching time increases with increasing the waiting time and increasing the pulse width of the prepolarization pulse caused by imprint effect.
Publisher: American Chemical Society (ACS)
Date: 24-04-2018
Abstract: Transparent flexible electrodes are in ever-growing demand for modern stretchable optoelectronic devices, such as display technologies, solar cells, and smart windows. Such sandwich-film-electrodes deposited on polymer substrates are unattainable because of the low quality of the films, inducing a relatively large optical loss and resistivity as well as a difficulty in elucidating the interference behavior of light. In this article, we report a high-quality AZO/Au/AZO sandwich film with excellent optoelectronic performance, e.g., an average transmittance of about 81.7% (including the substrate contribution) over the visible range, a sheet resistance of 5 Ω/sq, and a figure-of-merit (FoM) factor of ∼55.1. These values are well ahead of those previously reported for sandwich-film-electrodes. Additionally, the interference behaviors of light modulated by the coat and metal layers have been explored with the employment of transmittance spectra and numerical simulations. In particular, a heater device based on an AZO/Au/AZO sandwich film exhibits high performance such as short response time (∼5 s) and uniform temperature field. This work provides a deep insight into the improvement of the film quality of the sandwich electrodes and the design of high-performance transparent flexible devices by the application of a flexible substrate with an atomically smooth surface.
Publisher: European Alliance for Innovation n.o.
Date: 2016
Publisher: Elsevier BV
Date: 03-2018
Publisher: Tsinghua University Press
Date: 06-2019
Publisher: Elsevier BV
Date: 07-2020
Publisher: American Chemical Society (ACS)
Date: 11-12-2020
Publisher: Elsevier BV
Date: 12-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6SC00245E
Abstract: Charge transfer has been demonstrated to have a fundamental role in particulate Ta 3 N 5 electrode for achieving high efficient photoelectrochemical water oxidation.
Publisher: Hindawi Limited
Date: 11-07-2018
DOI: 10.1155/2018/5296406
Abstract: This paper presents a suboptimal approach for resource allocation of massive MIMO-OFDMA systems for high-speed train (HST) applications. An optimization problem is formulated to alleviate the severe Doppler effect and maximize the energy efficiency (EE) of the system. We propose to decouple the problem between the allocations of antennas, subcarriers, and transmit powers and solve the problem by carrying out the allocations separately and iteratively in an alternating manner. Fast convergence can be achieved for the proposed approach within only several iterations. Simulation results show that the proposed algorithm is superior to existing techniques in terms of system EE and throughput in different system configurations of HST applications.
Publisher: Elsevier BV
Date: 2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC06900A
Abstract: A hybrid photoanode integrating photosystem II with a hematite film is constructed for photoelectrochemical water oxidation.
Publisher: Springer Science and Business Media LLC
Date: 30-10-2007
Publisher: AIP Publishing
Date: 16-11-2015
DOI: 10.1063/1.4935951
Abstract: The dielectric and ferroelectric nonlinearity of Nb-doped PbZrO3 relaxor ferroelectric thin films was investigated. The ac field dependence of the permittivity of relaxor ferroelectric thin films is demonstrated to be described by a Rayleigh type relation. Both reversible and irreversible components of dielectric permittivity decrease linearly with the logarithm of the frequency of the ac field. The irreversible Rayleigh coefficient α′(T) shows a peak around the “freezing temperature” Tf, which is probably according to the transition from polar nano-regions (PNRs) to dipole-glass state in relaxor ferroelectrics. The results demonstrate that the models describing the interaction of domain walls and randomly distributed pinning centers in ferroelectric materials can be extended to the displacement of nanoscale walls in relaxors.
Publisher: IOP Publishing
Date: 10-09-2019
Publisher: Elsevier BV
Date: 07-2021
Publisher: Springer Science and Business Media LLC
Date: 22-06-2012
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC00312F
Abstract: Modification of an FTO surface using tetramethylammonium hydroxide achieves 20.1% efficiency for ETL-free perovskite solar cells with a reduced hysteresis.
Publisher: IEEE
Date: 12-2017
Publisher: AIP Publishing
Date: 08-2008
DOI: 10.1063/1.2964088
Abstract: The temperature dependence of dielectric permittivity was investigated for the barium zirconium titanate solid solution system [BZT, Ba(ZrxTi1−x)O3 0.25≤x≤0.5]. The dielectric relaxation behavior was observed in these ferroelectrics with diffused phase transition. In contrast to the canonical relaxors such as Pb(Mg1/3Nb2/3)O3, the diffused phase transition of BZT could not be well described by the popular modified Curie–Weiss law. Quasiferroelectric state theory was introduced to explain the dielectric results of the BZT relaxors.
Publisher: AIP Publishing
Date: 15-01-2018
DOI: 10.1063/1.5010358
Abstract: In this paper, high-performance conducting Al-doped ZnO (AZO) electrodes were deposited on transparent and flexible muscovite mica substrates. The use of mica as a substrate material makes a van der Waals epitaxy possible, which significantly improves the structural, electrical, and optical properties of deposited AZO single-crystal-like films. AZO/mica retains its low electric resistivity, even after continuous bending of up to 1000 times on account of the unique layered structure of mica. When used as a transparent heater, AZO/mica shows an ultrahigh heating rate (200 °C/s) across large areas, which is a record among flexible transparent heaters.
Publisher: Elsevier BV
Date: 09-2019
Publisher: American Chemical Society (ACS)
Date: 17-01-2018
DOI: 10.1021/JACS.7B10662
Abstract: It has been anticipated that learning from nature photosynthesis is a rational and effective way to develop artificial photosynthesis system, but it is still a great challenge. Here, we assembled a photoelectrocatalytic system by mimicking the functions of photosystem II (PSII) with BiVO
Publisher: Elsevier BV
Date: 11-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CP02391A
Abstract: Overall water splitting with STH efficiency exceeding 2.5% using an all earth-abundant dual-photoelectrode device under parallel illumination without bias.
Publisher: AIP Publishing
Date: 25-02-2019
DOI: 10.1063/1.5082803
Abstract: Ultrathin and transparent metal films are considered as desirable materials to substitute indium-tin oxide based transparent electrodes. In this work, we report that an Al-doped ZnO layer effectively induced the formation of epitaxial ultrathin and ultrasmooth Au films on mica. The ultrathin Au film shows optimum electrical conductivity, optical properties, and high tolerance to mechanical bending, including a low sheet resistance of 8 Ω/sq and a high average transmittance of 80.1%, and maintains low electric resistivity even after 1000 continuous bending cycles. Moreover, the Au/AZO anode-based organic light-emitting diode was fabricated with the maximum luminance intensity of 32 540 cd/cm2, which demonstrates that it is promising for application in next generation optoelectronic devices.
Publisher: Elsevier BV
Date: 06-2008
Publisher: Elsevier BV
Date: 10-2015
Publisher: American Physical Society (APS)
Date: 07-12-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA07498J
Abstract: Photofuel cells have been demonstrated to be a promising strategy for generating electricity using biomass.
Publisher: American Chemical Society (ACS)
Date: 12-10-2020
Publisher: IOP Publishing
Date: 12-2017
Publisher: Elsevier BV
Date: 09-2019
Publisher: Elsevier BV
Date: 12-2015
Publisher: Springer International Publishing
Date: 2014
Publisher: Elsevier BV
Date: 08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA05725J
Abstract: Herein, we presented a facile and universal synthetic route that can incorporate a series of amorphous metal–phosphorous-derived (denoted as M–P) HER catalysts with p-Si under ambient conditions.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2018
Publisher: Springer Science and Business Media LLC
Date: 14-11-2017
DOI: 10.1038/S41467-017-01655-5
Abstract: Multi-layer structure of functional materials often involves the integration of different crystalline phases. The film growth orientation thus frequently exhibits a transformation, owing to multiple possibilities caused by incompatible in-plane structural symmetry. Nevertheless, the detailed mechanism of the transformation has not yet been fully explored. Here we thoroughly probe the heteroepitaxially grown hexagonal zinc oxide (ZnO) films on cubic (001)-magnesium oxide (MgO) substrates using advanced scanning transition electron microscopy, X-ray diffraction and first principles calculations, revealing two distinct interface models of (001) ZnO/(001) MgO and (100) ZnO/(001) MgO. We have found that the structure alternatives are controlled thermodynamically by the nucleation, while kinetically by the enhanced Zn adsorption and O diffusion upon the phase transformation. This work not only provides a guideline for the interface fabrication with distinct crystalline phases but also shows how polar and non-polar hexagonal ZnO films might be manipulated on the same cubic substrate.
Publisher: Wiley
Date: 22-11-2018
Publisher: AIP Publishing
Date: 07-11-2022
DOI: 10.1063/5.0097238
Abstract: Flexoelectricity of semiconductors usually exhibits large flexoelectric coefficients due to their significantly enhanced surface piezoelectricity caused by surface symmetry breaking. In this Letter, we reported a general paradigm to tune the semiconductor flexoelectricity through interface engineering. We selected Nb-SrTiO3 (Nb-STO) single crystals as the targets and tuned their surface piezoelectricity through depositing TiO2-terminated and SrO-terminated ultra-thin BaTiO3 (BTO) films. The results suggested that the deposition of TiO2-terminated and SrO-terminated ultra-thin BaTiO3 films to Nb-STO can induce a downward and upward out-of-plane surface polarization, respectively, thereby significantly increasing/decreasing the apparent flexoelectric coefficients of Nb-STO single crystals. Our work proves the feasibility of interface engineering in the application of flexoelectricity and also provides a possible route to achieve the large apparent flexoelectricity of semiconductor materials.
Publisher: China Science Publishing & Media Ltd.
Date: 2016
Publisher: Elsevier BV
Date: 02-2016
Abstract: A multichannel quartz crystal microbalance array (MQCM) with three pairs of gold electrodes was fabricated for detection of two biomarkers: acetone and nitric oxide (NO). The gold electrodes were deposited symmetrically on an AT-cut 10 MHz circular quartz plate using photolithography, sputtering, and lift-off technologies. The effect of gold layer thickness on MQCM performance was investigated and the optimized thickness was 101 nm. The simulation values of the electric parameters C0, Cq, Lq, and Rq in the Butterworth-Van Dike equivalent circuit for the MQCM device were 97 pF, 1.3 pF, 1.05 mH, and 9.8 Ω, respectively. Simulation values were in the theoretical range, which indicated that the fabricated MQCM device had good resonance performance. Two types of nanocomposites, titanium dioxide-multiwalled carbon nanotubes and cobalt (II)phthalocyanine-silica, were synthesized as sensing materials. The sensing mechanism is based on coordination adsorption of target molecules onto the sensing material, resulting in a resonant frequency shift of modified QCM sensor. A linear range from 4.33 to 129.75 ppmv for acetone was obtained and one from 5.75 to 103.45 ppbv for NO.
Publisher: IEEE
Date: 06-2018
Publisher: Trans Tech Publications Ltd.
Date: 15-03-2007
Publisher: AIP Publishing
Date: 05-2009
DOI: 10.1063/1.3125271
Abstract: The measurement of dielectric spectroscopy over a broad frequency range of 0.01–107 Hz has been conducted to examine the segmental motions in poly[3-hydroxybutyrate-co-3-hydroxyvalerate] (PHBV) biopolymers. The ac conductivity at either low temperatures or high frequencies is almost temperature independent, indicating clearly that the nearly constant loss (NCL) phenomenon also takes place in polymers. The respective data were analyzed by adding a NCL term to the Jonscher relation. NCL in PHBV is discussed to be originated from the vibrational motion model. PHBV may have potential application as a biodegradable dielectric material.
Publisher: Tsinghua University Press
Date: 24-02-2021
DOI: 10.1007/S40145-020-0442-1
Abstract: The resistive switching (RS) mechanism of hybrid organic-inorganic perovskites has not been clearly understood until now. A switchable diode-like RS behavior in MAPbBr 3 single crystals using Au (or Pt) symmetric electrodes is reported. Both the high resistance state (HRS) and low resistance state (LRS) are electrode-area dependent and light responsive. We propose an electric-field-driven inner p-n junction accompanied by a trap-controlled space-charge-limited conduction (SCLC) conduction mechanism to explain this switchable diode-like RS behavior in MAPbBr 3 single crystals.
Publisher: Elsevier BV
Date: 04-2007
Publisher: Cold Spring Harbor Laboratory
Date: 28-02-2019
DOI: 10.1101/563452
Abstract: Ancestral sequence reconstruction has had recent success in decoding the origins and the determinants of complex protein functions. However, phylogenetic analyses of remote homologues must handle extreme amino-acid sequence ersity resulting from extended periods of evolutionary change. We exploited the wealth of protein structures to develop an evolutionary model based on protein secondary structure. The approach follows the differences between discrete secondary structure states observed in modern proteins and those hypothesised in their immediate ancestors. We implemented maximum likelihood-based phylogenetic inference to reconstruct ancestral secondary structure. The predictive accuracy from the use of the evolutionary model surpasses that of comparative modelling and sequence-based prediction the reconstruction extracts information not available from modern structures or the ancestral sequences alone. Based on a phylogenetic analysis of multiple protein families, we showed that the model can highlight relationships that are evolutionarily rooted in structure and not evident in amino acid-based analysis.
Publisher: American Chemical Society (ACS)
Date: 09-2017
Abstract: Photoelectrochemical water splitting provides an attractive way to store solar energy in molecular hydrogen as a kind of sustainable fuel. To achieve high solar conversion efficiency, the most stringent criteria are effective charge separation and injection in electrodes. Herein, efficient photoelectrochemical water oxidation is realized by optimizing charge separation and surface charge transfer of GaN:ZnO photoanode. The charge separation can be greatly improved through modified moisture-assisted nitridation and HCl acid treatment, by which the interfaces in GaN:ZnO solid solution particles are optimized and recombination centers existing at the interfaces are depressed in GaN:ZnO photoanode. Moreover, a multimetal phosphide of NiCoFeP was employed as water oxidation cocatalyst to improve the charge injection at the photoanode/electrolyte interface. Consequently, it significantly decreases the overpotential and brings the photocurrent to a benchmark of 3.9 mA cm
Publisher: Wiley
Date: 30-05-2014
Abstract: Photoelectrochemical (PEC) water splitting is an ideal approach for renewable solar fuel production. One of the major problems is that narrow bandgap semiconductors, such as tantalum nitride, though possessing desirable band alignment for water splitting, suffer from poor photostability for water oxidation. For the first time it is shown that the presence of a ferrihydrite layer permits sustainable water oxidation at the tantalum nitride photoanode for at least 6 h with a benchmark photocurrent over 5 mA cm(-2) , whereas the bare photoanode rapidly degrades within minutes. The remarkably enhanced photostability stems from the ferrihydrite, which acts as a hole-storage layer. Furthermore, this work demonstrates that it can be a general strategy for protecting narrow bandgap semiconductors against photocorrosion in solar water splitting.
Publisher: AIP Publishing
Date: 12-09-2013
DOI: 10.1063/1.4821042
Abstract: The dielectric and transport properties of Ba(Fe0.5Nb0.5)O3 ceramics have been investigated in a temperature range of 140–300 K and a frequency range of 1 Hz–10 MHz. The temperature dependence of bulk dc conductivity does not feature an Arrhenius behavior, but indicates a variable-range-hopping mechanism. The observed low temperature relaxation can be perfectly described by a polaronic model, which indicates that the dielectric relaxation is intimately related to the hopping motion caused by localized charge carriers.
Publisher: Springer Science and Business Media LLC
Date: 20-04-2020
Publisher: SPIE
Date: 02-04-2012
DOI: 10.1117/12.922902
Publisher: Royal Society of Chemistry (RSC)
Date: 16-09-2014
DOI: 10.1039/C4CP03731F
Abstract: Ultra-high onset potential hinders the application of hematite for photoelectrochemical (PEC) water splitting. Herein, a hematite photoanode with an unprecedentedly low onset potential of 0.50 V vs. the reversible hydrogen electrode for PEC water oxidation is reported. The drastically reduced onset potential is mainly ascribed to the passivation of the hematite surface states and the gradient structure made by H2-O2 flame at high temperature.
Publisher: IEEE
Date: 12-2017
Publisher: IOP Publishing
Date: 09-11-2011
DOI: 10.1088/0022-3727/44/47/475305
Abstract: A type of Ni/CCTO/PVDF three-phase percolative composite was prepared, in which the filler content (volume fraction) of Ni and CCTO was set at 60 vol%. The dependence of permittivity, electrical modulus and ac conductivity on the concentration of Ni and CCTO fillers near the percolation threshold was investigated in detail. The permittivity of the composites dramatically increased as the Ni content approached 24 vol%. This unique physical mechanism was realized as the formation of conductive channels near the percolation threshold. Analysis on the electrical modulus showed that the conductive channels are governed by three relaxation processes induced by the fillers (Ni, CCTO) and PVDF matrix, which are the interfacial polarization derived from the interfaces between fillers (Ni, CCTO) and PVDF matrix, and the polarization of CCTO ceramic filler and PVDF matrix. The conductivity behaviour with various Ni loadings and temperature suggested that the transition from an insulating to a conducting state should be induced by charge tunnelling between Ni–Ni particles, Ni–CCTO fillers and Ni–PVDF matrix. These findings demonstrated that the tunnelling conduction in the composite can be attributed to the unique physical mechanism near the percolation threshold.
Publisher: SPIE
Date: 18-07-2007
DOI: 10.1117/12.779867
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 08-2016
Publisher: AIP Publishing
Date: 08-07-2022
DOI: 10.1063/5.0087676
Abstract: Significant flexoelectricity is expected to exist in materials with colossal permittivity. Here, we systematically studied the interplay of flexoelectricity and permittivity in CaCu3Ti4O12 (CCTO) ceramic by examining the thickness and electrode dependence of the flexoelectric coefficients over a wide range of temperatures. We found that an abnormal flexoelectric transition occurs at 95 °C. Below this critical temperature, the barrier layer mechanism dominates the significant flexoelectricity in CCTO ceramic, whereas above this critical temperature, the flexoelectric response mainly originates from the contributions of semiconducting grains and insulating grain boundaries. The observed flexoelectric transition is beneficial not only for developing new materials with high flexoelectric coefficients but also for understanding the colossal permittivity mechanism in CCTO ceramics.
Publisher: AIP Publishing
Date: 30-10-2006
DOI: 10.1063/1.2374682
Abstract: The dielectric properties of CaCu3Ti4O12 (CCTO) ceramics have been investigated in a temperature range of 143–573K and a frequency range of 1Hz–10MHz. A dielectric anomaly has been observed between 350 and 600K. The broad dielectric peaks in ε′(T) can be well fitted by a modified Curie-Weiss law and a Vogel-Fulcher relationship, which is indicative of a relaxor ferroelectric behavior. A slim I-V loop as well as the P-E hysteresis loop and broad maxima in ε″(f) also suggest the existence of a relaxor ferroelectric behavior in CCTO ceramics.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5EE03802B
Abstract: The integrated architecture enables the Ta 3 N 5 photoanode to approach the theoretical photocurrent limit for solar water splitting.
Publisher: Wiley
Date: 02-08-2017
Publisher: AIP Publishing
Date: 16-12-2019
DOI: 10.1063/1.5126987
Abstract: Coupling between polarization and the strain gradient, namely, flexoelectricity, is a universal phenomenon that widely exists in all solid dielectrics and polymers. At a low level of the applied strain gradient, this electromechanical coupling is strictly a linear effect. In this Letter, a strong nonlinearity between the polarization and the strain gradient was experimentally found in polyvinylidene fluoride when the strain gradient was higher than a material-dependent threshold value. Such nonlinear behavior was in good accordance with an ion chain theory and could be fitted by a nonlinear equation. The observed flexoelectric nonlinearity in this work will help in the understanding of the discrepancy between the previous findings about the bulk materials and their nanoscale counterparts.
Publisher: American Chemical Society (ACS)
Date: 08-01-2019
Abstract: HfO
Publisher: Springer Science and Business Media LLC
Date: 27-07-2017
DOI: 10.1038/S41598-017-07192-X
Abstract: BaTi 1−x Sn x O 3 (BTSn, 0 ≤ x ≤ 0.30) ceramics were prepared by both the conventional sintering (CS) and sparking plasma sintering (SPS). Composition, temperature and grain size dependences of the nonlinear dielectric behaviors were systematically studied. BTSn was found to have especially large tunability (≥90%), which is larger than most other Pb-free systems, and is comparable to Pb-based relaxors. The high dielectric tunability in BTSn is attributed to its specific domain structures. Besides, temperature dependent tunability of BTSn presents a dispersed behavior and the dispersion is enhanced with the increase of Sn 4+ concentrations, which is explained by the compositional fluctuation model.
Publisher: Elsevier BV
Date: 11-2017
DOI: 10.20964/2017.11.38
Publisher: Wiley
Date: 05-12-2017
Publisher: Wiley
Date: 16-08-2018
Abstract: Organic bioelectronics have shown promising applications for various sensing purposes due to their significant advantages in term of high flexibility, portability, easy fabrication, and biocompatibility. Here, a new type of organic device, organic photo-electrochemical transistor (OPECT), is reported, which is the combination of an organic electrochemical transistor and a photo-electrochemical gate electrode modified with CdS quantum dots (QDs). Thanks to the inherent lification function of the transistor, the OPECT-based biosensor exhibits much higher sensitivity than that of a traditional biosensor. The sensing mechanism of the OPECT is attributed to the charge transfer between the photosensitive semiconductor CdS QDs and the gate electrode. In an OPECT-based DNA sensor, target DNA is labeled with Au nanoparticles (NPs) and captured on the gate electrode, which can influence the charge transfer on the gate caused by the exciton-plasmon interactions between CdS QDs and Au NPs. Consequently, a highly sensitive and selective DNA sensor with a detection limit of around 1 × 10
Publisher: AIP Publishing
Date: 02-01-2006
DOI: 10.1063/1.2161119
Abstract: We simplified the hydrothermal process using oxides instead of liquid-base reactants as precursors. Lead lanthanum zirconate titanate Pb0.94La0.06(Zr0.65Ti0.35)0.985O3 (PLZT) thick films were prepared on Ti substrates at 150°C via hydrothermal synthesis. The films with a single perovskite structure were smooth and the surfaces were free of micrometer scale cracks. The thickness of the film was about 56μm. The dielectric constant and dielectric loss were 665 and 0.03, respectively, at 1MHz. Even at high frequencies the dielectric properties of the PLZT film still remain stable. The s les showed excellent reproducibility in the measurement of leakage current.
Publisher: Elsevier BV
Date: 06-2019
Publisher: MDPI AG
Date: 08-05-2017
DOI: 10.3390/CRYST7050130
Publisher: Wiley
Date: 11-04-2015
Publisher: Elsevier BV
Date: 03-2022
Publisher: IEEE
Date: 10-2012
Publisher: American Chemical Society (ACS)
Date: 13-10-2016
Abstract: Sn-doped In
Publisher: AIP Publishing
Date: 16-10-2017
DOI: 10.1063/1.5001265
Abstract: Flexoelectricity couples strain gradient to polarization and usually exhibits a large coefficient in the paraelectric phase of the ferroelectric perovskites. In this study, we employed the relaxor 0.3Pb(In1/2Nb1/2)O3-0.35Pb(Mg1/3Nb2/3)O3-0.35PbTiO3 (PIN-PMN-PT) single crystals to study the relationship between flexoelectric coefficients and the crystal structure. The flexoelectric coefficients in PIN-PMN-PT single crystal are found to vary from 57 μC/m at orthorhombic/monoclinic phase to 135 μC/m at tetragonal phase, and decreases to less than 27 μC/m in the temperature above Tm. This result discloses that ferroelectricity can significantly enhance the flexoelectricity in this kind of perovskite.
Publisher: Elsevier BV
Date: 02-2020
Publisher: OMICS Publishing Group
Date: 2016
Publisher: China Science Publishing & Media Ltd.
Date: 2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TC00218H
Abstract: A negative electrocaloric effect (ECE) in 4 mol% Eu-doped PbZrO 3 antiferroelectric (AFE) thin films prepared by using a sol–gel method is investigated via indirect measurements.
Publisher: American Chemical Society (ACS)
Date: 12-08-2015
Publisher: Springer Science and Business Media LLC
Date: 08-01-2011
Publisher: AIP Publishing
Date: 27-09-2010
DOI: 10.1063/1.3494531
Abstract: The Vögel–Fulcher (VF) equation ω=ω0 exp[−Ea/kB(Tm−Tf)] was frequently used to describe the dielectric relaxation of relaxor ferroelectrics where ω is the probe frequency at the peak temperature Tm of either the real or imaginary parts of the dielectric constant. We revisited this relation in a typical relaxor lead magnesium niobate and found that the parameters obtained were not physically meaningful. Meaningful results can only be obtained by fitting the VF relation on the characteristic relaxation time τc, whose temperature dependence can be obtained from the Cole–Cole model. The freezing temperature we obtained is 230 K, below which τc becomes temperature independent.
Publisher: ACM
Date: 16-04-2019
Publisher: Elsevier BV
Date: 2012
Publisher: American Chemical Society (ACS)
Date: 10-05-2018
Abstract: Epitaxy and misfit strain imposed by underlying substrates have been intensively used to tailor the microstructure and electronic properties of oxide films, but this approach is largely restricted by commercially limited substrates. In contrast to the conventional epitaxial misfit strains with a positive Poisson's constant, we show here a tunable Poisson's ratio with anomalous values from negative, zero, to positive. This permits effective control over the out-of-plane lattice parameters that strongly correlate the magnetic and transport properties in perovskite mixed-valence La
Publisher: American Chemical Society (ACS)
Date: 12-07-2023
Publisher: Institution of Engineering and Technology
Date: 25-11-2016
DOI: 10.1049/PBCE100E_CH3
Publisher: American Physical Society (APS)
Date: 29-09-2022
Publisher: Elsevier BV
Date: 04-2018
Publisher: AIP Publishing
Date: 20-08-2012
DOI: 10.1063/1.4747212
Publisher: Springer Science and Business Media LLC
Date: 25-04-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2019
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 30-09-2008
Publisher: AIP Publishing
Date: 04-05-2021
DOI: 10.1063/5.0048925
Abstract: The recently discovered large flexoelectricity in relaxor ferroelectrics has rekindled considerable research interest. In this paper, several Sm-doped Pb(Mg2/3Nb1/3)O3–xPbTiO3 (PMN–xPT) ferroelectric ceramics were prepared and the relationship between flexoelectricity and PT content was systematically investigated. The largest flexoelectric response (∼550 μC/m) was observed in the Sm-doped PMN–32PT ceramic, which should be accounted for in the reorientation of the polar nanoregions. At room temperature, the flexoelectric response of Sm-doped PMN–32PT ceramic is an order of magnitude higher than that of the parent PMN–PT ceramics and even 50% higher than that of Bi–PMN–32PT ceramic (∼300 μC/m). Such a big increment is directly related to the greater local structural heterogeneity caused by Sm3+ ions into PMN–PT. Therefore, the result presented in this paper verifies that introducing local structural heterogeneity is a feasible approach to achieve ultrahigh flexoelectricity.
Publisher: AIP Publishing
Date: 15-09-2010
DOI: 10.1063/1.3487472
Abstract: The effect of electric field on the dielectric properties of high-k Ba(Fe1/2Nb1/2)O3 ceramics with different grain sizes is reported. A low frequency giant dielectric tunability (& %) can be obtained under a bias field as low as 50 V/mm. The results suggest that the giant dielectric tunability originates from extrinsic contributions such as domain boundary and oxygen defect relaxations. These findings provide a clear understanding to the complicated dielectric response in a family of high-k ceramics and a key to the high tunability of nonferroelectrics under low electric fields, which is attractive for potential applications in tunable devices.
Publisher: Elsevier BV
Date: 06-2019
Publisher: AIP Publishing
Date: 17-04-2023
DOI: 10.1063/5.0142555
Abstract: We report a thickness-dependent flexoresistance effect caused by strain gradient in SrTiO3 (STO) epitaxial thin films. The strain gradient in STO was induced by using an atomic force microscope diamond-coated tip. The depolarization field caused by the strain gradient changes the electrical state of the film, resulting in a decrease in the resistance of the films by 4–6 orders of magnitude. By testing the current–voltage (I–V) curves of STO films with different thicknesses, it is found that the flexoresistance behavior of STO films is obvious thickness dependent: the thicker the film, the higher the force threshold to trigger the film to enter a highly conductive state. The comparison of the surface morphology before and after the I–V test with loading shows that only when the thickness of the STO film is below 8 nm, the film can enter the conductive state from the insulating state without damaging the surface. During the electrical state switching process, the strain gradient caused by tip loading play an important role in the modification of the film barrier.
Publisher: Elsevier BV
Date: 2017
Publisher: MDPI AG
Date: 05-03-2019
DOI: 10.3390/S19051126
Abstract: Traditional wireless security focuses on preventing unmanned aerial vehicle (UAV) communications from suspicious eavesdropping and/or jamming attacks. However, there is a growing need for governments to keep malicious UAV communications under legitimate surveillance. This paper first investigates a new surveillance paradigm for monitoring suspicious UAV communications via jamming suspicious UAVs. Due to the power consumption limitation, the choice of eavesdropping and jamming will reflect the performance of the UAVs communication. Therefore, the paper analyses the UAV’s eavesdropping and jamming models in different cases, and then proposes the model to optimize the data package in the constraints of lower power consumption, which can be solved by the proposed selection policy. The simulation results validate our proposed selection policy in terms of power consumption and eavesdropped packets. In different fading models, power consumption increases with time, regardless of distances, and our proposed policy performs better in Weibull fading channels in terms of eavesdropped packets.
Publisher: IEEE
Date: 05-2018
Publisher: American Chemical Society (ACS)
Date: 12-06-2015
Abstract: A highly textured (111)-oriented Pb0.8Ba0.2ZrO3 (PBZ) relaxor thin film with the coexistence of antiferroelectric (AFE) and ferroelectric (FE) phases was prepared on a Pt/TiOx/SiO2/Si(100) substrate by using a sol-gel method. A large recoverable energy storage density of 40.18 J/cm(3) along with an efficiency of 64.1% was achieved at room temperature. Over a wide temperature range of 250 K (from room temperature to 523 K), the variation of the energy density is within 5%, indicating a high thermal stability. The high energy storage performance was endowed by a large dielectric breakdown strength, great relaxor dispersion, highly textured orientation, and the coexistence of FE and AFE phases. The PBZ thin film is believed to be an attractive material for applications in energy storage systems over a wide temperature range.
Publisher: Elsevier BV
Date: 2019
DOI: 10.2139/SSRN.3474533
Publisher: ACM
Date: 06-12-2016
Publisher: Wiley
Date: 07-10-2019
Publisher: Elsevier BV
Date: 12-2020
Publisher: IEEE
Date: 04-2014
Publisher: China Science Publishing & Media Ltd.
Date: 2014
Publisher: AIP Publishing
Date: 29-10-2018
DOI: 10.1063/1.5045716
Abstract: In this letter, we report on significant flexoelectric fatigue in lead-free (K,Na,Li)(Nb,Sb)O3 (KNNLS) ceramics. In the ferroelectric phase of KNNLS, the observed effective transverse flexoelectric coefficient, which is initially as high as 1 μC/m, decreases nonlinearly with increasing cycles of strain gradient, and the fatigue regulation is well reproduced by a stretched exponential function. By comparing the time dependence of dielectric permittivity and ferroelectricity in KNNLS ceramics, we conclude that large flexoelectric and flexocoupling coefficients in the ferroelectric phase originate mainly from ferroelectricity and that the related flexoelectric fatigue is likely due to the pinning effect of ferroelectric domains.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2020
Publisher: AIP Publishing
Date: 02-2023
DOI: 10.1063/5.0134531
Abstract: In spite of the flexoelectric effect being a universal phenomenon in the ferroelectric perovskites, the current understanding of flexoelectric aging in ferroelectrics is, actually, rather incomplete. In this paper, we have fabricated a series of Mn-doped BaTiO3 perovskite ceramics (BaTi1–xMnxO3, x = 0.1% and 1%, BTMO) to systematically investigate the corresponding flexoelectric aging behavior by controlling the concentration of Mn. We found that the variation of Mn dopant significantly effects the Curie temperature, dielectric constant, flexoelectric aging, and flexoelectric coefficient of the BTMO ceramics. Especially for the BTMO (0.1%) ceramics, obvious ferroelectric aging and flexoelectric aging phenomenon are observed at room temperature. The main reason for aging of BTMO ceramics is that the doping of Mn introduces oxygen vacancies, which tend to be stable under the action of strain gradient and electric field. Therefore, the results presented in this paper verify that the flexoelectric aging in Mn-doped BTO ceramics is closely related to ferroelectric fatigue.
Publisher: Hindawi Limited
Date: 2015
DOI: 10.1155/2015/812538
Abstract: The considerable investigations of ferroelectric polymer thin films have explored new functional devices for flexible electronics industry. Polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene (TrFE) are the most commonly used polymer ferroelectric due to their well-defined ferroelectric properties and ease of fabrication into thin films. In this study, we review the recent advances of thin ferroelectric polymer films for organic electronic applications. Initially the properties of ferroelectric polymer and fabrication methods of thin films are briefly described. Then the theoretical polarization switching models for ferroelectric polymer films are summarized and the switching mechanisms are discussed. Lastly the emerging ferroelectric devices based on P(VDF-TrFE) films are addressed. Conclusions are drawn regarding future work on materials and devices.
Publisher: Elsevier BV
Date: 10-2018
Publisher: AIP Publishing
Date: 15-09-2008
DOI: 10.1063/1.2987733
Abstract: The temperature dependence of the dielectric permittivity of perovskite Ba(ZrxTi1−x)O3 solid solutions, PbMg1/3Nb2/3O3 relaxor, and BaTiO3 ferroelectric ceramics was measured. It is found that a Lorentz-type law can be used to describe the dielectric permittivity of either the normal ferroelectrics with or without diffuse phase transitions (DPT) or the typical ferroelectric relaxors. The ferroelectric DPT can be well described by just one fitting process using the Lorentz-type law, while the relaxor ferroelectric transition needs two independent fitting processes. The Lorentz-type law fails at the low temperature side of the dielectric maximum of a first-order ferroelectric phase transition. Above the transition temperature, the dielectric curves of all the studied materials can be well described by a Lorentz-type law.
Publisher: MDPI AG
Date: 20-01-2017
DOI: 10.3390/S17010194
Publisher: Elsevier BV
Date: 05-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TC02941E
Abstract: In this study, we used pulsed laser deposition to successfully grow epitaxial Hf 0.5 Zr 0.5 O 2 (HZO) films on (001)-, (011)- and (111)-oriented yttria-stabilized zirconia (YSZ) substrates using TiN as the bottom electrode.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6EE00526H
Abstract: Spatial charge separation achieved on the anisotropic facets of high symmetry SrTiO 3 nanocrystals for highly efficient photocatalytic overall water splitting.
Publisher: AIP Publishing
Date: 15-10-2007
DOI: 10.1063/1.2799259
Abstract: The piezoelectric response in Cd0.9Zn0.1Te (CZT) semiconductor single crystals has been investigated by analyzing room temperature impedance spectra. The polarization is significantly influenced by light illumination. A slow relaxation process of the piezoelectric response has been observed with a relaxation time of 37s, which is comparable to the discharge current results. The frequencies for piezoelectric resonance and antiresonance can be tuned to lower values when a bias field is applied and can be recovered when the bias field is removed. These phenomena may be universal for ferroelectric semiconductors and can be explained by a slow relaxation model in dielectrics.
Publisher: The Optical Society
Date: 20-10-2016
DOI: 10.1364/OL.41.004895
Publisher: Elsevier BV
Date: 11-2020
Publisher: American Physical Society (APS)
Date: 26-04-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6EE03401B
Abstract: A CdS–PSII hybrid PEC cell for overall water splitting contains a biomimetic electron transfer pathway comprising two redox shuttles.
Publisher: Elsevier BV
Date: 04-2008
Publisher: Elsevier BV
Date: 05-2008
Publisher: Wiley
Date: 24-11-2015
Abstract: The photo fuel cell (PFC) is a promising technology for simultaneously converting solar energy and bioenergy into electricity. Here, we present a miniature air-breathing PFC that uses either BiVO4 or W-doped BiVO4 as the photoanode and a Pt/C catalyst as the air-breathing cathode. The PFC exhibited excellent performance under solar illumination and when fed with several types of biomaterial. We found the PFC performance could be significantly enhanced using W-doping into the BiVO4 photoanode. With glucose as the fuel and simulated sunlight (AM 1.5 G) as the light source, the open-circuit voltage increased from 0.74 to 0.92 V, the short-circuit current density rose from 0.46 to 1.62 mA cm(-2) , and the maximum power density was boosted from 0.05 to 0.38 mW cm(-2) , compared to a PFC using undoped BiVO4 as the anode.
Publisher: Elsevier BV
Date: 07-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA01408F
Abstract: Dual-functional black phosphorus quantum dot electron selective layer was designed for plastic perovskite solar cells. The efficient electron extraction and improved perovskite film quality contributed to the reasonably high efficiency.
Publisher: Springer Science and Business Media LLC
Date: 31-08-2017
DOI: 10.1038/S41598-017-10562-0
Abstract: (In + Nb) co-doped TiO 2 (TINO) rutile is an emerging material with a colossal dielectric permittivity (CP) and a low dielectric loss over wide temperature and frequency ranges. The electrical inhomogeneous nature of TINO ceramics is demonstrated by direct local current probing with high-resolution conductive atomic force microscopy (cAFM). The CP response in TINO is found to originate from the electron-pinned defect dipole induced conductive cluster effect and the electrode effect. Two types of dielectric relaxations are simultaneously observed due to these two effects. With the given synthesis condition, we found TINO shows a highly leaky feature that impairs its application as a dielectric material. However, the fast-temperature-rising phenomenon found in this work may open a new door for TINO to be applied as a potential electrothermal material with high efficiency, oxidation-proof, high temperature stability, and energy saving.
Publisher: Elsevier BV
Date: 2012
Publisher: Elsevier BV
Date: 12-2019
Publisher: MDPI AG
Date: 31-08-2017
DOI: 10.3390/S17091997
Publisher: Springer Science and Business Media LLC
Date: 11-04-2018
Publisher: Wiley
Date: 02-09-2021
Abstract: The nucleation and growth of bubbles within a solid matrix is a ubiquitous phenomenon that affects many natural and synthetic processes. However, such a bubbling process is almost “invisible” to common characterization methods because it has an intrinsically multiphased nature and occurs on very short time/length scales. Using in situ transmission electron microscopy to explore the decomposition of a solid precursor that emits gaseous byproducts, the direct observation of a complete nanoscale bubbling process confined in ultrathin 2D flakes is presented here. This result suggests a three‐step pathway for bubble formation in the confined environment: void formation via spinodal decomposition, bubble nucleation from the spherization of voids, and bubble growth by coalescence. Furthermore, the systematic kinetics analysis based on COMSOL simulations shows that bubble growth is actually achieved by developing metastable or unstable necks between neighboring bubbles before coalescing into one. This thorough understanding of the bubbling mechanism in a confined geometry has implications for refining modern nucleation theories and controlling bubble‐related processes in the fabrication of advanced materials (i.e., topological porous materials).
Publisher: AIP Publishing
Date: 15-04-2010
DOI: 10.1063/1.3386511
Abstract: Mn-doped Bi(Mg1/2Ti1/2)–PbTiO3 disordered ferroelectric ceramics were studied under ac electric fields and a crossover from a nearly constant loss to a superlinear power-law behavior was observed. Our results confirmed that the nearly constant loss behavior also exists in disordered ferroelectrics. The exponent of the superlinear power-law was found to be temperature dependent. Such a behavior was related to the local movements of oxygen vacancies.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA18123F
Abstract: The relation between surface states and the photoresponse on a hematite photoanode unraveled in electrochemical way indicates that the distribution of surface states determines the current–potential curves.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA09832D
Abstract: An organic electrochemical transistor (OECT) based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate with porous anodic aluminum oxide (AAO) as a gate electrode was proposed for DNA sensing.
Publisher: Springer Science and Business Media LLC
Date: 15-09-2011
DOI: 10.1557/JMR.2011.271
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 05-2014
Publisher: AIP Publishing
Date: 18-07-2023
DOI: 10.1063/5.0157590
Abstract: Two-dimensional electron gas is precisely confined at the interface of insulating oxide thin films and substrates, e.g., LaAlO3/SrTiO3(STO) and, thus, shows 2D electronic transport features. Here, we report a high mobility electron state at the interface of a Cr2O3 film and a STO substrate, which is realized by depositing a Cr film onto a STO (111) substrate in high vacuum (1 × 10−10 mbar) using molecular beam epitaxy. At a substrate temperature of 700 °C, the deposited Cr films capture oxygen atoms from STO substrates, resulting in the formation of an insulating Cr2O3 layer and an oxygen-deficient STO layer. Due to the presence of high mobility electrons [1.5 × 104 cm2V−1 s−1 at 1.8 K] at the Cr2O3/STO interface, both out-of-plane and in-plane Shubnikov–de Haas oscillations are observed at low temperatures (& K), which suggests that the highly conducting electron gas has extended into the STO bulk along the thickness direction with a certain depth to allow electrons to complete the cyclotron motion.
Publisher: Elsevier BV
Date: 07-2022
Publisher: IOP Publishing
Date: 15-11-2016
Publisher: IEEE
Date: 06-2017
Publisher: AIP Publishing
Date: 15-07-2008
DOI: 10.1063/1.2956615
Abstract: Dielectric properties, microstructures, and phase transition behaviors of α and β phases of CaxBa1−xNb2O6 (x=0.22, 0.30, and 0.38) ceramics were investigated. All the three compositions had partially filled tungsten-bronze structure (TTB) and relatively high Curie temperatures (up to 345°C) compared with Sr1−xBaxNb2O6. The α phase exhibits unambiguously a diffused phase transition, while the β phase is associated with an incommensurate phase and needs to be further studied. The dielectric and ferroelectric properties of CaxBa1−xNb2O6 ceramics were strongly processing-dependent. A mechanism was proposed to explain the grain growth behavior of TTB ceramic niobates.
Publisher: World Scientific Pub Co Pte Lt
Date: 10-2019
DOI: 10.1142/S2010135X19500425
Abstract: Hybrid perovskite solar cells (PSCs) have been intensively studied in recent years because of their high efficiency and low costs. For PSCs, the electron transport layer (ETL) is a key for its photoelectric conversion efficiency. Here we demonstrate the application of amorphous InGaZnO 4 thin films as ETL for efficient PSCs by pulsed laser deposition (PLD). The PSC device using such InGaZnO 4 amorphous film as ETL has achieved an efficiency of 15.1%. The outstanding performance is attributed to the excellent properties of amorphous InGaZnO 4 oxide thin films, including high electron mobility and high transparency, what is more, the electronic properties of the films can be controlled by changing the partial pressure of oxygen in the deposition chamber and post-deposition annealing process. Our result will be helpful for preparation of large area PSCs and other opto-electric devices at low temperature by physical vapor deposition method.
Publisher: American Chemical Society (ACS)
Date: 12-02-2015
Abstract: The electrode-electrolyte interface chemistry is highly important for photoelectrochemical (PEC) and electrocatalytic water splitting where cations in the electrolyte are often crucial. However, the roles of cations in an electrolyte are much debated and not well-understood. This work reports that the PEC and electrocatalytic water oxidation (WO) activities in basic electrolytes with different cations follow an unexpected trend (Li(+) > K(+) > Na(+)) especially for long-term reaction. Such an abnormal order of activity is found to be the balance effect of two factors: the distinct extents of the weakening of O-H bond on electrode surface after interacting with cations in different electrolytes and the different rates of oxygen reduction reaction (ORR) which turns out to be dominant. Li(+) not only brings the most significant decrease of O-H bond strength but also is most effective for avoiding back reaction, while Na(+) shows the most detrimental effect on WO because of ORR. Our results provide important insight into the roles of cations in WO and demonstrate a new strategy of tailoring the electrode-electrolyte interface via judicious choice of cations in electrolyte for more efficient PEC and electrocatalytic water splitting.
Publisher: Elsevier BV
Date: 2020
DOI: 10.2139/SSRN.3581339
Publisher: Elsevier BV
Date: 05-2016
Publisher: IEEE
Date: 05-2019
Publisher: Springer Science and Business Media LLC
Date: 27-07-2021
Publisher: AIP Publishing
Date: 30-09-2019
DOI: 10.1063/1.5115561
Abstract: Flexoelectricity yields electric polarization through graded strains and exists in various kinds of solid dielectrics but usually with a weak coupling response. In this letter, several Bi-doped Pb(Mg2/3Nb1/3)O3-xPbTiO3 (PMN-xPT) ferroelectric ceramics were prepared and the interplay of their piezoelectricity and flexoelectricity was systematically investigated. The largest flexoelectric response (∼300 μC/m) was 30 times larger than that of pure PMN-PT and was observed in the Bi-doped PMN-32PT, where the after poling piezoelectric coefficients were also the largest (990 pC/N) among all the compositions. This suggests that the apparent flexoelectricity in ferroelectrics is highly related to the bulk piezoelectricity. Therefore, introducing a local structural heterogeneity is considered as a feasible approach to achieve an ultrahigh piezoelectric response while also providing an ultrahigh flexoelectricity.
Publisher: Elsevier BV
Date: 2024
Publisher: Elsevier BV
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 07-2009
Publisher: Elsevier BV
Date: 05-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6SC01611A
Abstract: The key to phase junctions for efficient charge separation is to consider both the phase alignment and interface structure.
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 05-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2016
Publisher: American Chemical Society (ACS)
Date: 20-12-2016
Publisher: American Physical Society (APS)
Date: 20-07-2022
Publisher: Hindawi Limited
Date: 25-09-2013
DOI: 10.1155/2013/795827
Abstract: The dielectric properties of CaCu 3 Ti 4 O 3 (CCTO) and A 2 FeNbO 6 (AFN, A = Ba, Sr, and Ca) giant dielectric constant ceramics were investigated in the frequency range from 1 Hz to 10 MHz. The relaxation properties can be perfectly described by a polaron model, indicating that the dielectric relaxation is intimately related to the hopping motion caused by localized charge carriers.
Publisher: Elsevier BV
Date: 11-2017
Publisher: IEEE
Date: 02-2018
Publisher: American Chemical Society (ACS)
Date: 09-03-2016
Abstract: The photoelectrochemical water oxidation efficiency of photoanodes is largely limited by interfacial charge-transfer processes. Herein, a metal oxide electron-transport layer (ETL) was introduced at the substrate-electrode interface. Hematite photoanodes prepared on Li(+)- or WO3-modified substrates deliver higher photocurrent. It is inferred that a Li-doped Fe2O3 (Li:Fe2O3) layer with lower flat band potential than the bulk is formed. Li:Fe2O3 and WO3 are proved to function as an expressway for electron extraction. Via introducing ETL, both the charge separation and injection efficiencies are improved. The lifetime of photogenerated electrons is prolonged by 3 times, and the ratio of surface charge transfer and recombination rate is enhanced by 5 times with Li:Fe2O3 and 125 times with WO3 ETL at 1.23 V versus reversible hydrogen electrode. This result indicates the expedited electron extraction from photoanode to the substrate can suppress not only the recombination at the back contact interface but also those at the surface, which results in higher water oxidation efficiency.
Publisher: Wiley
Date: 19-07-2016
Publisher: IEEE
Date: 06-2015
Publisher: IEEE
Date: 04-2018
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 08-2018
Publisher: MDPI AG
Date: 12-10-2015
DOI: 10.3390/S151025746
Publisher: IOP Publishing
Date: 19-10-2007
Location: Portugal
Start Date: 2020
End Date: 2021
Funder: Carnegie Mellon University
View Funded ActivityStart Date: 2011
End Date: 2014
Funder: Australian Research Council
View Funded ActivityStart Date: 2014
End Date: 2015
Funder: Ministry of National Development - Singapore
View Funded ActivityStart Date: 2015
End Date: 2016
Funder: Singapore - China Joint Research Programme
View Funded ActivityStart Date: 2017
End Date: 2019
Funder: FCT, Horizon 2020 Framework Programme
View Funded ActivityStart Date: 2017
End Date: 2019
Funder: Horizon 2020
View Funded ActivityStart Date: 2009
End Date: 2010
Funder: Innovation and Technology Fund
View Funded ActivityStart Date: 2010
End Date: 2011
Funder: Innovation and Technology Fund
View Funded Activity