ORCID Profile
0000-0002-8860-7098
Current Organisation
University of Sydney
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Biomaterials | Cellular nervous system | Biomedical engineering |
Publisher: Wiley
Date: 27-05-2021
Abstract: A new printable organic semiconducting material combination as a tissue equivalent photodetector for indirect X‐ray detection is demonstrated in this work. The device exhibits a higher optical‐to‐electrical conversion efficiency than any other reported printable organic systems for X‐ray photodetection while also operating efficiently with zero applied bias. Complete X‐ray detectors fabricated by coupling the photodiode with a plastic scintillator are among the first flexible and fully tissue equivalent X‐ray detectors capable of operating without external bias. The response to X‐rays is energy independent between 50 keV and 1.2 MeV, with a detection sensitivity equivalent to inorganic direct X‐ray detectors and one of the fastest temporal responses ever reported for organic X‐ray detectors. The materials can be printed into arrays with a pixel pitch of 120 μm, providing 2D spatial detection. The devices are found to be highly stable with respect to time, mechanical flexing, and large (5 kGy) radiation doses. The new materials and fully tissue equivalent X‐ray detectors reported here provide stable, printable, flexible, and tissue equivalent detectors with a high radiolucency that are ideally suited for wearable applications, where simultaneous monitoring and high transmission of the X‐ray absorbed dose into the human body is required.
Publisher: American Chemical Society (ACS)
Date: 12-10-2022
Abstract: Atomic-scale information about the structural and compositional properties of novel semiconductor nanowires is essential to tailoring their properties for specific applications, but characterization at this length scale remains a challenging task. Here, quasi-1D InAs/InGaAs semiconductor nanowire arrays were grown by selective area epitaxy (SAE) using molecular beam epitaxy (MBE), and their subsequent properties were analyzed by a combination of atom probe tomography (APT) and aberration-corrected transmission electron microscopy (TEM). Results revealed the chemical composition of the outermost thin InAs layer, a fine variation in the indium content at the InAs/InGaAs interface, and lightly incorporated element tracing. The results highlight the importance of correlative microscopy approaches in revealing complex nanoscale structures, with TEM being uniquely suited to interrogating the crystallography of InGaAs NWs, whereas APT is capable of three-dimensional (3D) elemental mapping, revealing the subtle compositional variation near the boundary region. This work demonstrates a detailed pathway for the nanoscale structural assessment of novel one-dimensional (1D) nanomaterials.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NR00839H
Abstract: The first report of sub-4 nm mapping of donor : acceptor nanoparticle composition in eco-friendly colloidal dispersions for organic electronics.
Publisher: Wiley
Date: 02-2018
DOI: 10.1002/MDS3.10001
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0QM00980F
Abstract: This work unravels the intricate relationship between non-fullerene acceptor material surface energy and nanostructure formation in organic nanoparticle colloids.
Publisher: Elsevier BV
Date: 11-2012
Publisher: Wiley
Date: 17-05-2023
Abstract: Here efficient organic photovoltaic devices fabricated from water‐based colloidal dispersions with donor:acceptor composite nanoparticles achieving up to 9.98% power conversion efficiency (PCE) are reported. This high efficiency for water processed organic solar cells is attributed to morphology control by surface energy matching between the donor and the acceptor materials. Indeed, due to a low interfacial energy between donor and the acceptor, no large phase separation occurs during the nanoparticle formation process as well as upon thermal annealing. Indeed, synchrotron‐based scanning transmission X‐ray microscopy reveals that the internal morphology of composite nanoparticles is intermixed as well as the active layer morphology after thermal treatment. The PCE of this system reaches 85% that of devices prepared from chlorinated solvent. The gap between water‐based inks and organic solvent‐based inks gets narrower, which is promising for the development of eco‐friendly processing and fabrication of organic photovoltaics.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8CP07137C
Abstract: Building intermixed donor–acceptor nanoparticle morphologies by utilising rapid miniemulsion dispersed phase solvent removal to disrupt self-assembly.
Publisher: American Chemical Society (ACS)
Date: 03-08-2020
Publisher: American Chemical Society (ACS)
Date: 09-03-2022
Publisher: Elsevier BV
Date: 02-2014
Publisher: American Chemical Society (ACS)
Date: 17-08-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B902468A
Publisher: Springer Science and Business Media LLC
Date: 14-02-2017
DOI: 10.1557/JMR.2017.7
Publisher: American Scientific Publishers
Date: 05-2013
Publisher: Elsevier BV
Date: 09-2013
Publisher: AIP Publishing
Date: 04-11-2013
DOI: 10.1063/1.4829152
Abstract: Water-based nanoparticle (NP) organic solar cells eliminate the need for harmful organic solvents during deposition. However, the core-shell NP structure should limit charge extraction resulting in poor performance. Here, we use dynamic Monte Carlo modelling to show that for optimised NP structures the core-shell character does not severely limit performance. Simulations further reveal that small NPs are more susceptible to extensive phase segregation, which diminishes charge carrier percolation pathways from the cores to the electrodes and thus inhibits charge extraction. Simulated performance behaviour was used to propose an explanation for the experimentally observed change in performance due to annealing.
Publisher: American Chemical Society (ACS)
Date: 08-06-2023
Publisher: IOP Publishing
Date: 10-12-2019
Abstract: Printed electronics is simultaneously one of the most intensely studied emerging research areas in science and technology and one of the fastest growing commercial markets in the world today. For the past decade the potential for organic electronic (OE) materials to revolutionize this printed electronics space has been widely promoted. Such conviction in the potential of these carbon-based semiconducting materials arises from their ability to be dissolved in solution, and thus the exciting possibility of simply printing a range of multifunctional devices onto flexible substrates at high speeds for very low cost using standard roll-to-roll printing techniques. However, the transition from promising laboratory innovations to large scale prototypes requires precise control of nanoscale material and device structure across large areas during printing fabrication. Maintaining this nanoscale material control during printing presents a significant new challenge that demands the coupling of OE materials and devices with clever nanoscience fabrication approaches that are adapted to the limited thermodynamic levers available. In this review we present an update on the strategies and capabilities that are required in order to manipulate the nanoscale structure of large area printed organic photovoltaic (OPV), transistor and bioelectronics devices in order to control their device functionality. This discussion covers a range of efforts to manipulate the electroactive ink materials and their nanostructured assembly into devices, and also device processing strategies to tune the nanoscale material properties and assembly routes through printing fabrication. The review finishes by highlighting progress in printed OE devices that provide a feedback loop between laboratory nanoscience innovations and their feasibility in adapting to large scale printing fabrication. The ability to control material properties on the nanoscale whilst simultaneously printing functional devices on the square metre scale is prompting innovative developments in the targeted nanoscience required for OPV, transistor and biofunctional devices.
Publisher: Springer Science and Business Media LLC
Date: 20-09-2019
DOI: 10.1557/MRC.2019.132
Publisher: Elsevier BV
Date: 12-2021
Publisher: Beilstein Institut
Date: 20-02-2018
DOI: 10.3762/BJNANO.9.60
Abstract: In this study we have optimised the preparation conditions for large-volume nanoparticle inks, based on poly(3-hexylthiophene) (P3HT):indene-C 60 multiadducts (ICxA), through two purification processes: centrifugal and crossflow ultrafiltration. The impact of purification is twofold: firstly, removal of excess sodium dodecyl sulfate (SDS) surfactant from the ink and, secondly, concentration of the photoactive components in the ink. The removal of SDS was studied in detail both by a UV–vis spectroscopy-based method and by surface tension measurements of the nanoparticle ink filtrate revealing that centrifugal ultrafiltration removed SDS at a higher rate than crossflow ultrafiltration even though a similar filter was applied in both cases (10,000 Da M w cut-off). The influence of SDS concentration on the aqueous solar nanoparticle (ASNP) inks was investigated by monitoring the surface morphology/topography of the ASNP films using atomic force microscopy (AFM) and scanning electron microscopy (SEM) and photovoltaic device performance as a function of ultrafiltration (decreasing SDS content). The surface morphology/topography showed, as expected, a decreased number of SDS crystallites on the surface of the ASNP film with increased ultrafiltration steps. The device performance revealed distinct peaks in efficiency with ultrafiltration: centrifuge purified inks reached a maximum efficiency at a dilution factor of 7.8 × 10 4 , while crossflow purified inks did not reach a maximum efficiency until a dilution factor of 6.1 × 10 9 . This difference was ascribed to the different wetting properties of the prepared inks and was further corroborated by surface tension measurements of the ASNP inks which revealed that the peak efficiencies for both methods occurred for similar surface tension values of 48.1 and 48.8 mN m −1 . This work demonstrates that addressing the surface tension of large-volume ASNP inks is key to the reproducible fabrication of nanoparticle photovoltaic devices.
Publisher: Elsevier BV
Date: 2018
Publisher: MDPI AG
Date: 16-05-2022
Abstract: Good conductivity, suitable transparency and uniform layers of graphene thin film can be produced by chemical vapour deposition (CVD) at low temperature and utilised as a transparent electrode in organic photovoltaics. Using chlorobenzene trapped in poly(methyl methacrylate) (PMMA) polymer as the carbon source, growth temperature (Tgrowth) of 600 °C at hydrogen (H2) flow of 75 standard cubic centimetres per minute (sccm) was used to prepare graphene by CVD catalytically on copper (Cu) foil substrates. Through the Tgrowth of 600 °C, we observed and identified the quality of the graphene films, as characterised by Raman spectroscopy. Finally, P3HT (poly (3-hexylthiophene-2, 5-diyl)): PCBM (phenyl-C61-butyric acid methyl ester) bulk heterojunction solar cells were fabricated on graphene-based window electrodes and compared with indium tin oxide (ITO)-based devices. It is interesting to observe that the OPV performance is improved more than 5 fold with increasing illuminated areas, hinting that high resistance between graphene domains can be alleviated by photo generated charges.
Publisher: American Chemical Society (ACS)
Date: 23-02-2021
Publisher: Elsevier BV
Date: 07-2015
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Chemical Society (ACS)
Date: 12-03-2021
Publisher: American Chemical Society (ACS)
Date: 09-01-2012
DOI: 10.1021/MA202497V
Publisher: Elsevier BV
Date: 09-2014
Publisher: Oxford University Press (OUP)
Date: 11-2021
DOI: 10.1017/S1551929521001322
Abstract: In response to the requirements imposed by the COVID-19 pandemic in 2020, we developed a remote learning undergraduate workshop for 44 students at the University of Newcastle by embedding scanning electron microscope (SEM) images of Maratus (Peacock) spiders into the MyScope Explore environment. The workshop session had two main components: 1) to use the online MyScope Explore tool to virtually image scales with structural color and pigmented color on Maratus spiders 2) to join a live SEM session via Zoom to image an actual Maratus spider. In previous years, the undergraduate university students attending this annual workshop would enter the Microscopy Facility at the University of Newcastle to image specimens with SEM however, in 2020 the Microscopy Facility was closed to student visitors, and this virtual activity was developed in order to proceed with the educational event. The program was highly successful and constitutes a platform that can be used in the future by universities for teaching microscopy remotely.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1QM90018H
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1RA02328D
Abstract: Plasmonic Na x WO 3 nanoparticles were introduced to aqueous processed organic photovoltaics with 35% device enhancement.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA00683J
Abstract: Microscopy and spectroscopy correlate efficiency enhancement of TQ1:PC 70 BM solar cells with changes in morphology through optimized solution formulation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9GC02288K
Abstract: Realising bicontinuous interpenetrating network morphologies – with nanoscale phase separation – for donor–acceptor material systems processed from environmentally-friendlier ink formulations.
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 12-2022
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CP55037K
Abstract: Organic photovoltaic devices with either bulk heterojunction (BHJ) or nanoparticulate (NP) active layers have been prepared from a 1 : 2 blend of (poly{3,6-dithiophene-2-yl-2,5-di(2-octyldodecyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-alt-naphthalene}) (PDPP-TNT) and the fullerene acceptor, ([6,6]-phenyl C71-butyric acid methyl ester) (PC70BM). Atomic force microscopy (AFM) and scanning electron microscopy (SEM) have been used to investigate the morphology of the active layers of the two approaches. Mild thermal treatment of the NP film is required to promote initial joining of the NPs in order for the devices to function, however the NP structure is retained. Consequently, whereas gross phase segregation of the active layer occurs in the BHJ device spin cast from chloroform, the nanoparticulate approach retains control of the material domain sizes on the length scale of exciton diffusion in the materials. As a result, NP devices are found to generate more than twice the current density of BHJ devices and have a substantially greater overall efficiency. The use of aqueous nanoparticulate dispersions offers a promising approach to control the donor acceptor morphology on the nanoscale with the benefit of environmentally-friendly, solution-based fabrication.
Publisher: Elsevier BV
Date: 09-2015
Publisher: AIP Publishing
Date: 27-01-2014
DOI: 10.1063/1.4863216
Abstract: Nanoparticulate zinc oxide can be prepared at low temperatures from solution processable zinc acetylacetonate. The use of this material as a cathode interfacial layer in nanoparticulate organic photovoltaic devices results in comparable performances to those based on reactive calcium layers. Importantly, the enhanced degradation stability and full solution processability make zinc oxide a more desirable material for the fabrication of large area printed devices.
Publisher: Springer Science and Business Media LLC
Date: 03-2017
DOI: 10.1557/MRC.2017.3
Publisher: Springer Science and Business Media LLC
Date: 10-04-2020
Publisher: Wiley
Date: 26-03-2013
DOI: 10.1002/POLA.26650
Publisher: MDPI AG
Date: 24-07-2023
Abstract: The performance of poly(3-hexylthiophene) (P3HT): phenyl-C61-butyric acid methyl ester (PCBM) organic photovoltaic (OPV) devices was found to be strongly influenced by environmental during preparation, thermal annealing conditions, and the material blend composition. We optimized laboratory fabricated devices for these variables. Humidity during the fabrication process can cause electrode oxidation and photo-oxidation in the active layer of the OPV. Thermal annealing of the device structure modifies the morphology of the active layer, resulting in changes in material domain sizes and percolation pathways which can enhance the performance of devices. Thermal annealing of the blended organic materials in the active layer also leads to the growth of crystalline for P3HT domains due to a more arrangement packing of chains in the polymer. Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) acts as a hole transport layer in these P3HT:PCBM devices. Two commercially materials of PEDOT:PSS were utilizing in the optimization of the OPV in this research high conductivity PEDOT:PSS-PH1000 and PEDOT:PSS-Al4083, which is specifically designed for OPV interfaces. It was demonstrated that OPVs were prepared with PEDOT:PSS-PH1000 have a less than the average performance of PEDOT:PSS-Al4083. The power conversion efficiency (PCE) decreased clearly with a reducing in masking area devices from 5 mm2 to 3.8 mm2 for OPVs based on PH1000 almost absolutely due to the reduced short circuit current (Jsc). This work provides a roadmap to understanding P3HT:PCBM OPV performance and outlines the preparation issues which need to be resolved for efficient device fabrication
Publisher: Elsevier BV
Date: 02-2010
DOI: 10.1016/J.ULTSONCH.2009.08.008
Abstract: Several acrylic hydrogels were prepared via ultrasonic polymerization of water soluble monomers and macromonomers. Ultrasound was used to create initiating radicals in viscous aqueous monomer solutions using the additives glycerol, sorbitol or glucose in an open system at 37 degrees C. The water soluble additives were essential for the hydrogel production, glycerol being the most effective. Hydrogels were prepared from the monomers 2-hydroxyethyl methacrylate, poly(ethylene glycol) dimethacrylate, dextran methacrylate, acrylic acid/ethylene glycol dimethacrylate and acrylamide/bis-acrylamide. For ex le a 5% w/w solution of dextran methacrylate formed a hydrogel in 6.5min in a 70% w/w solution of glycerol in water at 37 degrees C with 20kHz ultrasound, 56Wcm(-2). The ultrasonic polymerization method described here has a wide range of applications such a biomaterial synthesis where initiators are not desired.
Publisher: Elsevier BV
Date: 05-2016
Start Date: 2019
End Date: 2020
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2020
End Date: 2022
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2018
End Date: 2018
Funder: Australian Nanotechnology Network
View Funded ActivityStart Date: 2017
End Date: 2017
Funder: Australian National University
View Funded ActivityStart Date: 2018
End Date: 2019
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2021
End Date: 2024
Funder: National Health and Medical Research Council
View Funded ActivityStart Date: 2021
End Date: 2021
Funder: Australian National University
View Funded ActivityStart Date: 2020
End Date: 2020
Funder: University of Newcastle Australia
View Funded ActivityStart Date: 2013
End Date: 2013
Funder: University of Newcastle Australia
View Funded ActivityStart Date: 2012
End Date: 2012
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2011
End Date: 2014
Funder: Australian Renewable Energy Agency
View Funded ActivityStart Date: 2011
End Date: 2011
Funder: Department of Agriculture, Fisheries and Forestry, Australian Government
View Funded ActivityStart Date: 02-2023
End Date: 01-2026
Amount: $463,985.00
Funder: Australian Research Council
View Funded Activity