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Issue 35, 2016
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Synthesis of silicon quantum dots using cyclohexasilane (Si6H12)

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We report a novel, ambient pressure, continuous gas-phase, synthesis of Si-QDs by direct pyrolysis of cyclohexasilane (CHS, Si6H12), a liquid hydrosilane. We also report that using a low activation energy precursor such as Si6H12 enabled effective gas-phase reduction of the hydrosilane leading to better nucleation of Si nanoparticles than other hydrosilanes. By suitably designing the reactor length and its temperature profile, the structure of the Si-QDs are rendered amorphous or crystalline. The as-synthesized Si-QDs were thermally hydrosilylated with 1-dodecene and their properties examined. High resolution transmission electron microscopic (HRTEM) analysis revealed that the nano-crystalline Si-QDs (Si-NCs) have an average size of 2.0 nm. The amorphous Si-QDs (a-Si-QDs) and the Si-NCs samples exhibited UV-Vis absorptions below 300 and 375 nm, respectively. The a-Si-QDs and Si-NCs excited at 300 nm showed PL emissions at ∼370 nm and 374 nm, respectively, while the latter showed additional characteristic emissions at 403, 425 and 457 nm. The quantum yields were determined to be 9 and 13%, respectively, with PL relaxation life times of 6.5 and 13 ns, respectively.

Graphical abstract: Synthesis of silicon quantum dots using cyclohexasilane (Si6H12)

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Publication details

The article was received on 09 Apr 2016, accepted on 28 Jul 2016 and first published on 28 Jul 2016

Article type: Paper
DOI: 10.1039/C6TC01435F
Citation: J. Mater. Chem. C, 2016,4, 8206-8213

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    Synthesis of silicon quantum dots using cyclohexasilane (Si6H12)

    S. Guruvenket, J. M. Hoey, K. J. Anderson, M. T. Frohlich, R. Krishnan, J. Sivaguru, M. P. Sibi and P. Boudjouk, J. Mater. Chem. C, 2016, 4, 8206
    DOI: 10.1039/C6TC01435F

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