ORCID Profile
0000-0002-3520-1553
Current Organisation
Swinburne University of Technology
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Functional Materials | Optical Physics | Photonics, Optoelectronics and Optical Communications | Sensor Technology (Chemical aspects)
Diagnostic Methods | Health Status (e.g. Indicators of Well-Being) | National Security |
Publisher: Penerbit UTM Press
Date: 15-09-2013
DOI: 10.11113/JT.V64.2086
Abstract: This paper reports on the study of the effect on adding total peripheries and sharp edges to the Schottky contact as a hydrogen sensor. Schottky contact was successfully designed and fabricated as hexagon-shape. The contact was integrated together with zinc oxide thin film and tested towards 1% hydrogen gas. Simulations of the design were conducted using COMSOL Multiphysics to observe the electric field characteristic at the contact layer. The simulation results show higher electric field induced at sharp edges with 4.18×104 V/m. Current-voltage characteristic shows 0.27 V voltage shift at 40 µA biased current.
Publisher: Elsevier BV
Date: 05-2016
Publisher: IEEE
Date: 2007
Publisher: IEEE
Date: 10-2011
Publisher: Elsevier BV
Date: 05-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TC05982A
Abstract: Porous WO 3 nanofibers have been synthesized by electrospinning polyvinylpyrrolidone (PVP) nanofibers embedded with semiconducting WO 3 nanoparticles followed by annealing in air and have been tested toward acetone.
Publisher: Beilstein Institut
Date: 13-08-2018
DOI: 10.3762/BJNANO.9.202
Abstract: Electrospun one-dimensional (1D) nanostructures are rapidly emerging as key enabling components in gas sensing due to their unique electrical, optical, magnetic, thermal, mechanical and chemical properties. 1D nanostructures have found applications in numerous areas, including healthcare, energy storage, biotechnology, environmental monitoring, and defence/security. Their enhanced specific surface area, superior mechanical properties, nanoporosity and improved surface characteristics (in particular, uniformity and stability) have made them important active materials for gas sensing applications. Such highly sensitive and selective elements can be embedded in sensor nodes for internet-of-things applications or in mobile systems for continuous monitoring of air pollutants and greenhouse gases as well as for monitoring the well-being and health in everyday life. Herein, we review recent developments of gas sensors based on electrospun 1D nanostructures in different sensing platforms, including optical, conductometric and acoustic resonators. After explaining the principle of electrospinning, we classify sensors based on the type of materials used as an active sensing layer, including polymers, metal oxide semiconductors, graphene, and their composites or their functionalized forms. The material properties of these electrospun fibers and their sensing performance toward different analytes are explained in detail and correlated to the benefits and limitations for every approach.
Publisher: IOP Publishing
Date: 06-06-2016
DOI: 10.1088/0957-4484/27/28/285704
Abstract: We have successfully grown graphene film on the surface of cylindrical copper conductors by chemical vapour deposition. The quality and number of graphene layers have been investigated using Raman spectroscopy, Raman mapping and scanning electron microscopy, as a function of methane gas flow rate and of growth temperature. Transmission electron microscopy analysis has been performed to verify the number of graphene layers, confirming the results obtained by Raman spectroscopy. The results open up the possibility of using graphene as an anticorrosion coating for copper cables and earth grids.
Publisher: Elsevier BV
Date: 12-2018
Publisher: MDPI AG
Date: 15-11-2021
DOI: 10.3390/CHEMOSENSORS9110320
Abstract: Cyanopyridone-based oligothiophene donors with both hydrophobic and hydrophilic characters have been evaluated as active layers within simple capacitive devices for humidity sensing at room temperature. Surface studies using atomic force microscopy revealed a self-assembled nanofibrous network with a thin needle-like structure for the terminal hydroxy ex le (CP6), devoid in the methyl ex le (CP1). The sensing performance of each sensor was investigated over a broad range of relative humidity levels as a function of capacitance at room temperature. The sensor CP6 demonstrated favourable features such as high sensitivity (12.2 pF/%RH), quick response/recovery (13 s/20.7 s), wide working range of relative humidity (10%–95% RH), low hysteresis (0.57%), outstanding recyclability, and excellent long-term stability. From the results obtained, hydrophilicity and hydrogen bonding appear to play a vital role in enhancing humidity sensing performance, leading to possible new design directions for simple organic semiconductor-based sensors.
Publisher: IEEE
Date: 11-2010
Publisher: American Scientific Publishers
Date: 08-2009
DOI: 10.1166/SL.2009.1121
Publisher: MDPI AG
Date: 14-02-2022
DOI: 10.3390/CHEMOSENSORS10020078
Abstract: A two-dimensional (2D) Dy2O3-Pd-PDA/rGO heterojunction nanocomposite has been synthesised and tested for hydrogen (H2) gas sensing under various functioning conditions, including different H2 concentrations (50 ppm up to 6000 ppm), relative humidity (up to 25 %RH) and working temperature (up to 200 °C). The material characterisation of Dy2O3-Pd-PDA/rGO nanocomposite performed using various techniques confirms uniform distribution of Pd NPs and 2D Dy2O3 nanostructures on multi-layered porous structure of PDA/rGO nanosheets (NSs) while forming a nanocomposite. Moreover, fundamental hydrogen sensing mechanisms, including the effect of UV illumination and relative humidity (%RH), are investigated. It is observed that the sensing performance is improved as the operating temperature increases from room temperature (RT = 30 °C) to the optimum temperature of 150 °C. The humidity effect investigation revealed a drastic enhancement in sensing parameters as the %RH increased up to 20%. The highest response was found to be 145.2% towards 5000 ppm H2 at 150 °C and 20 %RH under UV illumination (365 nm). This work offers a highly sensitive and selective hydrogen sensor based on a novel 2D nanocomposite using an environmentally friendly and energy-saving synthesis approach, enabling us to detect hydrogen molecules experimentally down to 50 ppm.
Publisher: Elsevier BV
Date: 2010
Publisher: MDPI AG
Date: 19-09-2023
DOI: 10.3390/S23187971
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TC04922K
Abstract: We report on a highly sensitive erometric gas sensing device that employs electrospun tungsten oxide (WO 3−x ) nanofibers thus enabling trace levels (concentrations 1.2–12.5 ppm) of acetone vapor to be detected when operating at 350 °C.
Publisher: AIP Publishing
Date: 05-01-2009
DOI: 10.1063/1.3054164
Abstract: Pt/nanostructured molybdenum oxide (MoO3)/SiC Schottky diode based gas sensors were fabricated for hydrogen (H2) gas sensing. Due to the enhanced performance, which is ascribed to the application of MoO3 nanostructures, these devices were used in reversed bias. MoO3 characterization by scanning electron microscopy showed morphology of randomly orientated nanoplatelets with thicknesses between 50 and 500 nm. An α-β mixed phase crystallographic structure of MoO3 was characterized by x-ray diffraction. At 180 °C, 1.343 V voltage shift in the reverse I-V curve and a Pt/MoO3 barrier height change of 20 meV were obtained after exposure to 1% H2 gas in synthetic air.
Publisher: Elsevier BV
Date: 10-2014
Publisher: American Scientific Publishers
Date: 04-2011
DOI: 10.1166/SL.2011.1648
Publisher: American Scientific Publishers
Date: 02-2011
DOI: 10.1166/SL.2011.1409
Publisher: Elsevier BV
Date: 09-2009
Publisher: Wiley
Date: 08-07-2019
Publisher: Elsevier BV
Date: 29-04-2010
Publisher: IEEE
Date: 04-2013
Publisher: American Chemical Society (ACS)
Date: 14-09-2015
Publisher: American Chemical Society (ACS)
Date: 22-07-2010
DOI: 10.1021/JP104459S
Publisher: IEEE
Date: 10-2009
Publisher: AIP
Date: 2009
DOI: 10.1063/1.3156546
Publisher: MDPI AG
Date: 21-07-2023
DOI: 10.3390/CHEMOSENSORS11070409
Abstract: As a promising sustainable and clean energy source for the future, hydrogen plays an important role. Due to its high flammability and the explosive nature of hydrogen gas, it is crucial to employ reliable sensors that can detect the presence of hydrogen gas in air at room temperature (RT). By utilizing light, the working temperature of such gas sensors can be reduced whilst simultaneously enhancing sensing performance. In this study, sensors have been fabricated that introduces nano-Schottky junctions (Pd–TiO2) via a facile chemical method and p–n heterojunctions (PdO–TiO2), through both chemical and hydrothermal methods, with a mean Pd nanoparticle (NP) diameter of 4.98 ± 0.49 nm and 4.29 ± 0.45 nm, respectively. The hydrothermally treated Pd-decorated TiO2 nanosphere (HPT NS) shows a response of 100.88% toward 500 ppm hydrogen with a faster response and recovery (77 s and 470 s, respectively). Meanwhile, hydrothermally untreated Pd-decorated TiO2 (PT) NSs show a response of 100.29% with slow response and recovery times (240 s and 3146 s, respectively) at 30 °C under 565 nm visible light and a bias of 500 mV. The experimental results confirm that introducing both metallic Pd and PdO onto the TiO2 NSs open a novel approach for detecting hydrogen gas through light-induced sensing at room temperature using low voltage bias.
Publisher: IEEE
Date: 02-2010
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TC05362K
Abstract: An erometric sensor whose active layer is derived from a tetra core-substituted organic semiconductor, naphthalene diimide (NDI-CN4), has been evaluated for ammonia sensing at room temperature against the NDI devoid of core-substitution effects.
Publisher: IEEE
Date: 06-2011
Publisher: MDPI AG
Date: 02-2021
DOI: 10.3390/CHEMOSENSORS9020030
Abstract: This review provides an update on advances in the area of electrical mode sensors using organic small molecule n-type semiconductors based on perylene. Among small organic molecules, perylene diimides (PDIs) are an important class of materials due to their outstanding thermal, chemical, electronic, and optical properties, all of which make them promising candidates for a wide range of organic electronic devices including sensors, organic solar cells, organic field-effect transistors, and organic light-emitting diodes. This is mainly due to their electron-withdrawing nature and significant charge transfer properties. Perylene-based sensors of this type show high sensing performance towards various analytes, particularly reducing gases like ammonia and hydrazine, but there are several issues that need to be addressed including the selectivity towards a specific gas, the effect of relative humidity, and operating temperature. In this review, we focus on the strategies and design principles applied to the gas-sensing performance of PDI-based devices, including resistive sensors, erometric sensors, and operating at room temperature. The device properties and sensing mechanisms for different analytes, focusing on hydrazine and ammonia, are studied in detail, and some future research perspectives are discussed for this promising field. We hope the discussed results and ex les inspire new forms of molecular engineering and begin to open opportunities for other rylene diimide classes to be applied as active materials.
Publisher: IOP Publishing
Date: 21-12-2010
Publisher: American Scientific Publishers
Date: 02-2011
DOI: 10.1166/SL.2011.1418
Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 03-2018
Publisher: American Scientific Publishers
Date: 04-2011
DOI: 10.1166/SL.2011.1617
Publisher: AIP Publishing
Date: 06-2011
DOI: 10.1063/1.3583658
Abstract: Two different morphologies of nanotextured molybdenum oxide were deposited by thermal evaporation. By measuring their field emission (FE) properties, an enhancement factor was extracted. Subsequently, these films were coated with a thin layer of Pt to form Schottky contacts. The current-voltage (I-V) characteristics showed low magnitude reverse breakdown voltages, which we attributed to the localized electric field enhancement. An enhancement factor was obtained from the I-V curves. We will show that the enhancement factor extracted from the I-V curves is in good agreement with the enhancement factor extracted from the FE measurements.
Publisher: American Chemical Society (ACS)
Date: 18-09-2020
Publisher: MDPI AG
Date: 10-05-2022
DOI: 10.3390/NANO12101628
Abstract: A two-dimensional (2D) CeO2-Pd-PDA/rGO heterojunction nanocomposite has been synthesised via an environmentally friendly, energy efficient, and facile wet chemical procedure and examined for hydrogen (H2) gas sensing application for the first time. The H2 gas sensing performance of the developed conductometric sensor has been extensively investigated under different operational conditions, including working temperature up to 200 °C, UV illumination, H2 concentrations from 50–6000 ppm, and relative humidity up to 30% RH. The developed ceria-based nanocomposite sensor was functional at a relatively low working temperature (100 °C), and its sensing properties were improved under UV illumination (365 nm). The sensor’s response towards 6000 ppm H2 was drastically enhanced in a humid environment (15% RH), from 172% to 416%. Under optimised conditions, this highly sensitive and selective H2 sensor enabled the detection of H2 molecules down to 50 ppm experimentally. The sensing enhancement mechanisms of the developed sensor were explained in detail. The available 4f electrons and oxygen vacancies on the ceria surface make it a promising material for H2 sensing applications. Moreover, based on the material characterisation results, highly reactive oxidant species on the sensor surface formed the electron–hole pairs, facilitated oxygen mobility, and enhanced the H2 sensing performance.
Publisher: Hindawi Limited
Date: 06-02-2023
DOI: 10.1155/2023/5336273
Abstract: Background. According to recent studies, amyloid-β (Aβ) isoforms as cerebrospinal fluid (CSF) biomarkers have remarkable predictive value for cognitive decline in the early stages of Alzheimer’s disease (AD). Herein, we aimed to investigate the correlations between several targeted proteomics in CSF s les with Aβ ratios and cognitive scores in patients in AD spectrum to search for potential early diagnostic utility. Methods. A total of 719 participants were found eligible for inclusion. Patients were then categorized into cognitively normal (CN), mild cognitive impairment (MCI), and AD and underwent an assessment of Aβ and proteomics. Clinical Dementia Rating (CDR), Alzheimer’s Disease Assessment Scale (ADAS), and Mini Mental State Exam (MMSE) were used for further cognitive assessment. The Aβ42, Aβ42/Aβ40, and Aβ42/38 ratios were considered as means of comparison to identify those peptides corresponding significantly to these established biomarkers and cognitive scores. The diagnostic utility of the IASNTQSR, VAELEDEK, VVSSIEQK, GDSVVYGLR, EPVAGDAVPGPK, and QETLPSK was assessed. Results. All investigated peptides corresponded significantly to Aβ42 in controls. In those with MCI, VAELEDEK and EPVAGDAVPGPK were significantly correlated with Aβ42 ( p value 0.001). Additionally, IASNTQSR, VVSSIEQK, GDSVVYGLR, and QETLPSK were significantly correlated with Aβ42/Aβ40 and Aβ42/38 ( p value 0.001) in this group. This group of peptides similarly corresponded to Aβ ratios in those with AD. Eventually, IASNTQSR, VAELEDEK, and VVSSIEQK were significantly associated with CDR, ADAS-11, and ADAS-13, particularly in MCI group. Conclusion. Our research suggests potential early diagnostic and prognostic utilities for certain peptides extracted from CSF-targeted proteomics research. The ethical approval of ADNI is available at ClinicalTrials.gov with Identifier: NCT00106899.
Publisher: Beilstein Institut
Date: 17-07-2014
DOI: 10.3762/BJNANO.5.120
Abstract: Here we report on the synthesis of caesium doped graphene oxide (GO-Cs) and its application to the development of a novel NO 2 gas sensor. The GO, synthesized by oxidation of graphite through chemical treatment, was doped with Cs by thermal solid-state reaction. The s les, dispersed in DI water by sonication, have been drop-casted on standard interdigitated Pt electrodes. The response of both pristine and Cs doped GO to NO 2 at room temperature is studied by varying the gas concentration. The developed GO-Cs sensor shows a higher response to NO 2 than the pristine GO based sensor due to the oxygen functional groups. The detection limit measured with GO-Cs sensor is ≈90 ppb.
Publisher: Elsevier BV
Date: 12-2011
Publisher: IEEE
Date: 11-2010
Publisher: IEEE
Date: 10-2008
Publisher: Elsevier BV
Date: 03-2014
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC01968B
Abstract: Gas sensing performance of conductometric devices based on 2D hybrid nanomaterials operating at room temperature.
Publisher: Elsevier BV
Date: 05-2017
Publisher: MDPI AG
Date: 28-09-2022
DOI: 10.3390/S22197380
Abstract: Transport is Australia’s third-largest source of greenhouse gases accounting for around 17% of emissions. In recent times, and particularly as a result of the global pandemic, the rapid growth within the e-commerce sector has contributed to last-mile delivery becoming one of the main emission sources. Delivery vehicles operating at the last-mile travel long routes to deliver to customers an array of consignment parcels in varying numbers and weights, and therefore these vehicles play a major role in increasing emissions and air pollutants. The work reported in this paper aims to address these challenges by developing an IoT platform to measure and report on real-world last-mile delivery emissions. Such evaluations help to understand the factors contributing to freight emissions so that appropriate mitigation measures are implemented. Unlike previous research that was completed in controlled laboratory settings, the data collected in this research were from a delivery vehicle under real-world traffic and driving conditions. The IoT platform was tested to provide contextualised reporting by taking into account three main contexts including vehicle, environment and driving behaviours. This approach to data collection enabled the analysis of parcel level emissions and correlation of the vehicle characteristics, road conditions, ambient temperature and other environmental factors and driving behaviour that have an impact on emissions. The raw data collected from the sensors were analysed in real-time in the IoT platform, and the results showed a trade-off between parcel weight and total distance travelled which must be considered when selecting the best delivery order for reducing emissions. Overall, the study demonstrated the feasibility of the IoT platform in collecting the desired levels of data and providing detailed analysis of emissions at the parcel level. This type of micro-level understanding provides an important knowledge base for the enhancement of delivery processes and reduction of last-mile delivery emissions.
Publisher: Wiley
Date: 20-02-2008
DOI: 10.1002/SIA.2736
Abstract: Nanowires of different metal oxides (SnO 2 , ZnO) have been grown by evaporation–condensation process. Their chemical composition has been investigated by using XPS. The standard XPS quantification through main photoelectron peaks, modified Auger parameter and valence band spectra were examined for the accurate determination of oxidation state of metals in the nanowires. Morphological investigation has been conducted by acquiring and analyzing the SEM images. For the simulation of working conditions of sensor, the s les were annealed in ultra high vacuum (UHV) up to 500 °C and XPS analysis repeated after this treatment. Finally, the nanowires of SnO 2 have were used to produce a novel gas sensor based on Pt/oxide/SiC structure and operating as Schottky diode. Copyright © 2008 John Wiley & Sons, Ltd.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-07-2020
Publisher: Elsevier BV
Date: 04-2015
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 10-2019
Publisher: SPIE
Date: 26-12-2008
DOI: 10.1117/12.810108
Publisher: Elsevier BV
Date: 12-2009
Publisher: IEEE
Date: 10-2011
Publisher: IOP Publishing
Date: 14-11-2013
DOI: 10.1088/0957-4484/24/49/495501
Abstract: Nanorod forms of metal oxides are recognized as one of the most remarkable morphologies. Their structure and functionality have driven important advancements in a vast range of electronic devices and applications. In this work, we postulate a novel concept to explain how numerous localized surface states can be engineered into the bandgap of niobium oxide nanorods using tungsten. We discuss their contributions as local state surface charges for the modulation of a Schottky barrier height, the relative dielectric constant and their respective conduction mechanisms. Their effects on hydrogen gas molecule interaction mechanisms are also examined herein. We synthesized niobium tungsten oxide (Nb17W2O25) nanorods via a hydrothermal growth method and evaluated the Schottky barrier height, ideality factor, dielectric constant and trap energy level from the measured I-V versus temperature characteristics in the presence of air and hydrogen to show the validity of our postulations.
Publisher: SPIE
Date: 26-12-2008
DOI: 10.1117/12.810586
Publisher: Elsevier BV
Date: 07-2013
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TC03548E
Abstract: The ability to detect and monitor toxic and greenhouse gases is highly important, however to achieve this at room temperature and allow for remote sensing applications is a significant challenge.
Publisher: IEEE
Date: 11-2015
Location: Iran (Islamic Republic of)
Start Date: 2015
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2017
End Date: 2018
Funder: Department of Industry, Innovation and Science
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: NSW Department of Education and Training
View Funded ActivityStart Date: 06-2015
End Date: 12-2019
Amount: $434,300.00
Funder: Australian Research Council
View Funded Activity