Browsing Australian Research Council (ARC) by Subject "Chemistry"
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ItemApplication of polymer interlayers in silicon–carbon nanotube heterojunction solar cells(WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2015-02-27) Yu, Le Ping; Tune, Daniel David; Shearer, Cameron; Shapter, Joseph GeorgeWe explore the use of polymers as a conducting interlayer within silicon–carbon nanotube heterojunction photovoltaics. Three types of devices have been fabricated and characterized including silicon–carbon nanotube, silicon–conducting polymer and silicon–conducting polymer–carbon nanotube. The conducting polymers studied were polyaniline, poly(3-hexylthiophene-2,5-diyl) and poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate). A thin conducting polymer interlayer significantly improves photovoltaic performance by creating a better depletion layer within the underlying silicon. With the addition of a top antireflection layer, a photovoltaic device, silicon-poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate)–carbon nanotube–poly(styrene) has been fabricated with a photovoltaic conversion efficiency of 8.7 %. ItemHeterojunction solar cells based on silicon and composite films of graphene oxide and carbon nanotubes(WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2015-05-08) Yu, Le Ping; Tune, Daniel David; Shearer, Cameron; Shapter, Joseph GeorgeGraphene oxide (GO) sheets have been used as the surfactant to disperse single-walled carbon nanotubes (CNT) in water to prepare GO/CNT electrodes that are applied to silicon to form a heterojunction that can be used in solar cells. GO/CNT films with different ratios of the two components and with various thicknesses have been used as semitransparent electrodes, and the influence of both factors on the performance of the solar cell has been studied. The degradation rate of the GO/CNT-silicon devices under ambient conditions has also been explored. The influence of the film thickness on the device performance is related to the interplay of two competing factors, namely, sheet resistance and transmittance. CNTs help to improve the conductivity of the GO/CNT film, and GO is able to protect the silicon from oxidation in the atmosphere. ItemNon-toxic luminescent carbon dot/poly(dimethylacrylamide) nanocomposite reagent for latent fingermark detection synthesized via surface initiated reversible addition fragmentation chain transfer polymerization(John Wiley & Sons, 2015-01-13) Dilag, Jessirie; Kobus, Hilton John; Yu, Yang; Gibson, Christopher; Ellis, Amanda VeraHere, non-toxic luminescent carbon nanoparticles, namely carbon dots (C-dots), were facilely synthesized via a one-pot hydrothermal route. Raman, Fourier transform infrared, fluorescence, carbon NMR and X-ray photoelectron spectroscopies revealed that the C-dots possessed a graphitic-like core with an oxidized surface. The oxidized surface of the C-dots allowed for functionalization of the C-dots with a 2-methyl-2-[(dodecylsulfanylthiocarbonyl)sulfanyl]propanoic acid chain transfer agent. Poly(N,N-dimethylacrylamide) (p(DMA)) was then grafted from the C-dot surface via surface initiated reversible addition fragmentation chain transfer (RAFT) polymerization. The resulting luminescent C-dot/polymer nanocomposite, C-dot/p(DMA), was analyzed using UV−visible and fluorescence spectrometry verifying that the functionalized surface was responsible for the C-dots' luminescence. This C-dot/p(DMA) nanocomposite was water soluble and was used as a solution for the luminescent detection of latent fingermarks deposited on non-porous aluminium foil substrates. ItemRecent developments in nucleic acid identification using solid-phase enzymatic assays(Springer Verlag, 2014-02-04) Khodakov, Dmitriy A; Ellis, Amanda VeraThis review (containing 101 references) covers recent achievements in the development of new approaches for enzymatically assisted detection of nucleic acids on microarrays. We discuss molecular techniques including the polymerase chain reaction, reverse transcription, allele specific primer extension and a range of isothermal techniques for the amplification and discrimination of nucleic acids. This also includes their implementation into microfluidic systems. These techniques all show great promise for use in the life sciences by allowing for high throughput, cost effective and highly sensitive and specific analysis of nucleic acids. Importantly, they can be potentially integrated into personalized and point-of-care medicine. ItemSequence selective capture, release and analysis of DNA using a magnetic microbead-assisted toehold-mediated DNA strand displacement reaction(Royal Society of Chemistry, 2014-05-15) Khodakov, Dmitriy A; Khodakova, Anastasia S; Linacre, Adrian Matthew Thornton; Ellis, Amanda VeraThis paper reports on the modification of magnetic beads with oligonucleotide capture probes with a specially designed pendant toehold (overhang) aimed specifically to capture double-stranded PCR products. After capture, the PCR products were selectively released from the magnetic beads by means of a toehold-mediated strand displacement reaction using short artificial oligonucleotide triggers and analysed using capillary electrophoresis. The approach was successfully shown on two genes widely used in human DNA genotyping, namely human c-fms (macrophage colony-stimulating factor) proto-oncogene for the CSF-1 receptor (CSF1PO) and amelogenin. ItemSolution processed graphene–silicon Schottky junction solar cells(Royal Society of Chemistry, 2015-04-20) Larsen, Lachlan J; Shearer, Cameron; Ellis, Amanda Vera; Shapter, Joseph GeorgeHere, surfactant-assisted exfoliated graphene (SAEG) has been used to make transparent conducting graphene films which for the first time were used to make SAEG–silicon Schottky junctions for photovoltaics. The graphene films were characterised using UV-Vis spectroscopy, Raman spectroscopy, atomic force microscopy and four point probe sheet resistance measurements. The effects of film thickness, thermal annealing and chemical doping of the graphene films on the power conversion efficiency (PCE) of the cells were investigated. Mild annealing of thickness optimised films resulted in a doubling of the PCE. Additionally, chemical doping resulted in a further 300% increase of the peak PCE. These results indicate that SAEG has the potential to compete with chemical vapour deposited graphene in graphene–silicon Schottky junction applications.