ORCID Profile
0000-0001-5612-1520
Current Organisation
Tianjin University
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Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9NH00719A
Abstract: The combination of graphene oxide and cellulose produces shape programmable active origamis, which are able to transform among their multi-stable morphs, including 3D soft robotic architectures, mechanical metamaterials and biomimetic analogies.
Publisher: Elsevier BV
Date: 12-2016
Publisher: American Chemical Society (ACS)
Date: 04-2022
Publisher: American Chemical Society (ACS)
Date: 29-03-2023
Publisher: Wiley
Date: 03-07-2017
Publisher: Wiley
Date: 05-2023
DOI: 10.1002/APJ.2920
Abstract: A series of ultra‐microporous rod‐shaped three‐dimensional metal organic frameworks MAF stu‐1 modified with different amounts of ammonia water were synthesized by solvothermal method using chelated nitrogen‐containing ligands, which was applied to CO 2 capture and exhibited excellent adsorption performance and CO 2 /N 2 (15:85, v/v) separation efficiency. MAF stu‐1‐C regulated by .13 mol NH 3 had small pore size of 4.9 Å and uncoordinated imidazole nitrogen sites in the channel, which were beneficial to improving CO 2 adsorption capacity and selectivity. The maximal CO 2 adsorption capacity of MAF stu‐1‐C was 110 cm 3 /g, exhibiting excellent CO 2 capture ability and cycle stability. The ideal adsorption solution theory (IAST) model was used to calculate the adsorption and separation ratio of CO 2 to N 2 . The CO 2 to N 2 selectivity of the modified adsorbent was more than 100. Furthermore, the adsorption heat of MAF stu‐1‐C for CO 2 was calculated to be about 35 kJ/mol by virial equation fitting method, indicating that the modified adsorbent also had remarkable regeneration performance.
Publisher: Wiley
Date: 02-07-2021
Publisher: Wiley
Date: 14-06-2021
Abstract: A direct thin film approach to fabricate large‐surface MoS 2 nanosheet thin film supercapacitors using the solution‐based diffusion of thiourea into an anodized MoO 3 thin film was investigated. A dense MoS 2 nanosheet thin film electrode (D‐MoS 2 ) was obtained when the anodized MoO 3 thin film was processed in a low thiourea solution concentration, whereas a highly porous MoS 2 nanosheet thin film electrode (P‐MoS 2 ) was formed at a higher thiourea solution concentration. The charge storage performances of the D‐MoS 2 and P‐MoS 2 thin films displayed an unusual increase in capacitance on extended cycling, leading to a capacitance as high as around 5–8 mF cm −2 . X‐ray diffraction and cross‐sectional microscopy revealed the capacitance enhancements of the MoS 2 supercapacitors are attributable to the nucleation of a new MoS 2‐ x O x phase upon cycling. For the D‐MoS 2 nanosheet thin film, the formation and growth of the MoS 2‐ x O x phase during cycling was accompanied by a volumetric expansion of the MoS 2 layer. For the P‐MoS 2 thin film, the nucleation and growth of the MoS 2‐ x O x phase occurred in the pores of the MoS 2 layer. The propagation of the MoS 2‐ x O x phase also shifted the charge storage process in both films from a diffusion‐limited process to a capacitive‐dominant process.
Publisher: Elsevier BV
Date: 04-2020
Publisher: American Chemical Society (ACS)
Date: 21-04-2016
Abstract: Some oxides have the ability to trap excess electrons in the form of small polarons. Here, using first-principles techniques, we investigate the interaction of excess electrons with α-MoO3. Polarons are found to be about 0.6 eV more stable than delocalized electrons. They can propagate with a high degree of anisotropicity along different crystallographic directions with the lowest barrier found to be about 0.08 eV. In addition to the band gap photoexcited charge carriers that can populate such polaron states, we investigate the role of oxygen vacancies as an intrinsic source of electrons. We also investigate intercalated alkali ions that can form complexes with the created polarons in the lattice. The alkali-polaron complex (AxMoO6, A = alkali ion) binding energies are relatively low, making it easy for the complex to dissociate. This, coupled with the low polaron migration energies, can generate a non-negligible contribution to electronic conductivity even in the absence of illumination, which is experimentally verified. Combined, this light-induced intercalation of alkali ion in MoO3 and its subsequent deintercalation (complex dissociation) processes lead to a novel self-photocharghing phenomenon.
Publisher: American Chemical Society (ACS)
Date: 12-07-2018
Publisher: Elsevier BV
Date: 02-2011
DOI: 10.1016/J.JCIS.2010.10.061
Abstract: The effect of gold attachment on the physical characteristics, cellular uptake, gene expression efficiency, and biocompatibility of magnetic iron oxide (MNP) vector was investigated in vitro in BHK21 cells. The surface modification of magnetite with gold was shown to alter the morphology and surface charge of the vector. Nonetheless, despite the differences in the surface charge with and without gold attachment, the surface charge of all vectors were positive when conjugated with PEI/DNA complex, and switched from positive to negative when suspended in cell media containing serum, indicating the adsorption of serum components onto the composite. The cellular uptake of all MNP vectors under the influence of a magnetic field increased when the composite loadings increased, and was higher for the MNP vector that was modified with gold. Both bare magnetite and gold-coated magnetite vectors gave similar optimal gene expression efficiency, however, the gold-coated magnetite vector required a 25-fold higher overall loading to achieve a comparable efficiency as the attachment of gold increased the particle size, thus reducing the surface area for PEI/DNA complex conjugation. The MNP vector without gold showed optimal gene expression efficiency at a specific magnetite loading, however further increases beyond the optimum loading decreased the efficiency of gene expression. The drop in efficiency at high magnetite loadings was attributed to the significant reduction in cellular viability, indicating the bare magnetite became toxic at high intracellular levels. The gene expression efficiency of the gold-modified vector, on the other hand, did not diminish with increasing magnetite loadings. Intracellular examination of both bare magnetite and gold-coated magnetite vectors at 48h post-magnetofection using transmission electron microscopy provided evidence of the localization of both vectors in the cell nucleus for gene expression and elucidated the nuclear uptake mechanism of both vectors. The results of this work demonstrate the efficacy of gold-modified vectors to be used in cellular therapy research that can function both as a magnetically-driven gene delivery vehicle and an intracellular imaging agent with negligible impact on cell viability.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA00700G
Abstract: A photoactive Bi 2 MoO 6 /MoO 3 heterojunction electrode derived from a direct thin-film-route showed close to 100% faradic photocurrent-to-O 2 conversion efficiency.
Publisher: American Chemical Society (ACS)
Date: 09-03-2023
Publisher: Springer Science and Business Media LLC
Date: 11-12-2014
DOI: 10.1038/SREP07428
Abstract: Nanocrystalline molybdenum oxide (α-MoO 3 ) thin films with iso-oriented crystalline layers were synthesised by the anodisation of Mo foils. Upon band-gap excitation using light illumination, α-MoO 3 generates excited electrons for reductive reactions and stores some of the excited electrons in its layered crystalline structure via alkali cation intercalation. These stored electrons can be subsequently discharged from α-MoO 3 to allow reductive reactions to continue to occur under non-illuminated conditions. The modulation of water concentrations in the organic/aqueous anodisation electrolytes readily produces α-MoO 3 crystals with high degree of (kk0) crystallographic orientation. Moreover, these (kk0)-oriented MoO 3 crystals exhibit well-developed {hk0} and {0k0} crystal facets. In this paper, we show the benefits of producing α-MoO 3 thin films with defined crystal facets and an iso-oriented layered structure for in situ storing of excited charges. α-MoO 3 crystals with dominant (kk0) planes can achieve fast charging and a strong balance between charge release for immediate exploitation under illuminated conditions and charge storage for subsequent utilisation in dark. In comparison, α-MoO 3 crystals with dominant (0k0) planes show a preference for excited charge storage.
Publisher: Wiley
Date: 20-12-2017
Publisher: Wiley
Date: 08-05-2014
Abstract: Nanostructured molybdenum oxide (α-MoO3 ) thin film photoelectrodes were synthesised by anodisation. Upon band gap-excitation by light illumination, α-MoO3 is able to store a portion of the excited charges in its layered structure with the simultaneous intercalation of alkali cations. The stored electrons can be discharged from α-MoO3 for utilisation under dark conditions, and α-MoO3 is able to recharge itself with successive illuminations to behave as a 'self-photo-rechargeable' alkali-ion battery. The alteration of the anodisation pH allowed the crystal structure and oxygen vacancy concentrations of α-MoO3 to be modulated to achieve (i) a distorted MoO6 octahedra for enhanced charge separation and storage, (ii) a layered structure with a greater exposed (010) crystal face for rich and reversible ion intercalation and (iii) a highly crystalline thin film that suppresses electron-hole pair recombination. Overall, the larger MoO6 octahedral distortion in α-MoO3 at a higher pH favours charge storage, whereas smaller octahedral distortion at a lower pH leads to anodic photocurrent enhancement.
Location: Korea, Republic of
No related grants have been discovered for Shi Nee Lou.