News Column

Australian Nuclear Science and Technology Organization Reports Findings in Quantum Dots

February 28, 2014



By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Quantum Dots. According to news reporting out of Menai, Australia, by NewsRx editors, research stated, "High-quality TOP/TOPO capped CdSe quantum dots (QDs) displaying a narrow emission band have been grafted on to graphene nanosheets through a simple wet chemical procedure. A significant red-shift of both the broad absorption and narrow emission spectra of the QDs is induced in the resultant hybrid material, presumably by a strong graphene-QD interaction consistent with a quantum tunnelling phenomenon."

Our news journalists obtained a quote from the research from Australian Nuclear Science and Technology Organization, "The optical properties of monodisperse CdSe QDs of 3-4 nm in diameter have been determined in UV-vis and photoluminescence spectra and HRTEM and XPS data, demonstrating the successful decoration of graphene sheets with CdSe QDs. The CdSe QD absorption was observed to shift to longer wavelengths by up to 30 nm, with a corresponding shift of up to 18 nm observed in the emission band. This effect is equivalent to a narrowing of the band gap by 0.094 +/- 0.015 eV in absorption and 0.033 +/- 0.013 eV in emission, or an interaction potential of 9.1 +/- 1.5 kJ mol(-1). Another is to consider the effective particle growth based upon the narrowed band gap, consistently found to be 28 +/- 1%, despite the physical size remaining unchanged."

According to the news editors, the research concluded: "By effectively shifting the absorption and emission of CdSe QDs to longer wavelengths, this type of nanocomposite may have potential applications in the fields of optics, biological imaging and sensing."

For more information on this research see: Deposition of CdSe quantum dots on graphene sheets. Journal of Luminescence, 2014;146():46-52. Journal of Luminescence can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Journal of Luminescence - www.elsevier.com/wps/product/cws_home/505700)

Our news journalists report that additional information may be obtained by contacting F.K. Kanodarwala, Australian Nucl Sci & Technol Organization, Bragg Inst, Menai, NSW 2234, Australia. Additional authors for this research include F. Wang, P.J. Reece and J.A. Stride (see also Quantum Dots).

Keywords for this news article include: Menai, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies, Australia and New Zealand

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Source: Science Letter


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