ORCID Profile
0000-0003-4377-2791
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Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA04927J
Abstract: Partially ring-terminated graphene quantum dots enable efficient detection of aromatic molecules via the edge-localized π–π interaction.
Publisher: Elsevier
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 17-03-2016
DOI: 10.1557/ADV.2016.198
Publisher: Elsevier BV
Date: 08-2009
DOI: 10.1016/J.JCIS.2009.04.005
Abstract: A novel route is proposed to produce graphite nanoplatelets (GNPs) and graphene sheets. The natural graphite flakes were directly exfoliated by ultrasonication in formic acid. A stable graphene aqueous dispersion was obtained using the as-produced GNPs after two processing steps: (i) chemical oxidation of GNPs to graphite oxide nanoplatelets (GONPs) and (ii) chemical reduction of graphite oxide nanoplatelets to graphene. The total duration for oxidation and production of stable graphite oxide colloid was significantly shortened due to the use of exfoliated GNPs with large surface area. The work proposed here has several advantages over the previous methods, including a high efficiency of exfoliation process, the use of a non-toxic, environmental-friendly intercalant and the capability for mass production of graphene for industrial applications.
Publisher: Wiley
Date: 17-04-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7RE00197E
Abstract: High shear vortex fluidics coupled with NIR affords luminescent carbon dots as a scalable process.
Publisher: Elsevier BV
Date: 08-2011
Publisher: American Chemical Society (ACS)
Date: 23-01-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA16516H
Abstract: This review provides a comprehensive account on the current research status regarding the toxicity of graphene quantum dots (GQDs) – a new nano material with profound potential in various advanced applications.
Publisher: American Chemical Society (ACS)
Date: 08-11-2017
DOI: 10.1021/ACS.JPCLETT.7B02550
Abstract: Graphene quantum dots (GQDs) are emerging luminescent nanomaterials for energy, bioimaging, and optoelectronic applications. However, unlike conventional fluorophores, GQDs contain multiple emissive centers that result in a complex interaction with external electromagnetic fields. Here we utilize core-shell plasmonic nanoparticles to simultaneously enhance and modulate the photoluminescence (PL) intensities and spectral profiles of GQDs. By analyzing the spectral profiles, we show that the emissive centers are highly influenced by the proximity to the metal particles. Under optimal spacer thickness of 25 nm, the overall PL displays a four-fold enhancement compared with a pristine GQD. However, detailed lifetime measurements indicate the presence of midgap states that act as the bottleneck for further enhancement. Our results offer new perspectives for fundamental understanding and new design of functional luminescent materials (e.g., GQDs, graphene oxide, carbon dots) for imaging, sensing, and light harvesting.
Publisher: American Scientific Publishers
Date: 03-2008
DOI: 10.1166/JNN.2008.342
Publisher: Elsevier BV
Date: 02-2015
Publisher: Wiley
Date: 16-02-2018
Publisher: Elsevier BV
Date: 05-2010
Publisher: Elsevier BV
Date: 2019
Publisher: Center for Open Science
Date: 27-09-2019
Abstract: Biological molecules such as proteins, DNA and RNA have specific spatial configuration known as conformation which is essential for the functions of those molecules. The specific binding or ‘docking’ of one molecule (e. g. O2, glucose, proteins) to its conformational matching biomolecules (e. g. DNA, RNA, proteins) underscores all biological processes ranging from DNA transcription, protein synthesis, biological signaling (e. g. endocrinology), in vitro transportation of nutrition to enzymatic reactions and so on. However, the mathematical or physical basis of such ‘shape-driven’ binding behaviors still remains mystery. In particular given the stochasticity and the crowdedness of the intracellular environment, how cell manage to achieve all the molecule binding in biological processes is not yet well understood. Here, we present a theory that may provide a footing for mathematical or physical understanding of the binding behavior of molecules with biomolecules. This theory attributes the binding interactions to the existence of conformational potentials that are specific to the shapes of the molecules. We derived a spatially varied diffusion coefficients and the corresponding stochastic equation for diffusive motion of molecules in a conformational potential, which indicates the Einstein’s diffusion theory featured with an invariant diffusion coefficient is an approximation of our version of diffusion at places far from the centers of the binding sites. The theory provides a good explanation for the ‘anomalous diffusion’ behavior of biomolecules observed in single particle tracking studies. It also provides for the first time an experimentally measurable physical quantity named ‘conformational coefficient’ for studying the conformational behaviors and functioning mechanisms of biomolecules.
Publisher: Elsevier BV
Date: 12-2010
Publisher: American Scientific Publishers
Date: 11-2010
Abstract: In this study, the effects of chemical functionalization on the elastic properties of graphene sheets are investigated by using molecular dynamics (MD) and molecular mechanics (MM) simulations. The influences of the degree of functionalization, which is defined as the ratio of the number of the total sp3-hybridized atoms to the number of the total carbon atoms of the graphene sheet, the chirality of graphene sheets, the molecular structure and molecular weight of functional groups on Young's modulus are studied. The dependence of shear modulus and wrinkling properties on the functional groups are also investigated. The simulation results indicate that Young's modulus depends strongly on the degree of functionalization and the molecular structure of the functional groups, while the effects of chirality of the graphene sheets and the molecular weight of the functional groups are negligible. The chemical functionalization also reduces the shear modulus and critical strain, beyond which the wrinkling instability occurs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC03302D
Abstract: We for the first time report a quantum-confined bandgap narrowing mechanism through which the absorption of two UV absorbers, namely the graphene quantum dots (GQDs) and TiO 2 nanoparticles, can be easily extended into the visible light range in a controllable manner.
Start Date: 2013
End Date: 2016
Funder: Commonwealth Scientific and Industrial Research Organisation
View Funded ActivityStart Date: 2013
End Date: 2016
Funder: Griffith University
View Funded ActivityStart Date: 2019
End Date: 2023
Funder: Australian Research Council
View Funded Activity