Photoluminescence enhancement of porous silicon particles by microwave-assisted activation

Authors

  • Bing Xia,

    Corresponding author
    1. Key Laboratory of Forest Genetics & Biotechnology (Ministry of Education of China), Nanjing Forestry University, Nanjing 210037, P. R. China
    2. Advanced Analysis and Testing Center, Nanjing Forestry University, Nanjing 210037, P. R. China
    • Phone: +86-25-85428960, Fax: +86-25-85485496
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  • Wenyi Zhang,

    1. Key Laboratory of Forest Genetics & Biotechnology (Ministry of Education of China), Nanjing Forestry University, Nanjing 210037, P. R. China
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  • Weiyi Bao,

    1. Advanced Analysis and Testing Center, Nanjing Forestry University, Nanjing 210037, P. R. China
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  • Chen Dong,

    1. Key Laboratory of Forest Genetics & Biotechnology (Ministry of Education of China), Nanjing Forestry University, Nanjing 210037, P. R. China
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  • Junfeng Zhang,

    1. State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, P. R. China
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  • Jisen Shi

    Corresponding author
    1. Key Laboratory of Forest Genetics & Biotechnology (Ministry of Education of China), Nanjing Forestry University, Nanjing 210037, P. R. China
    • Phone/Fax: +86-25-85428711
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Abstract

Photoluminescence (PL) of porous silicon (PSi) particles can be significantly enhanced in some organic solvents (i.e., ethanol or dimethyl sulfoxide) under microwave irradiation. Fourier transform infrared spectra, dynamic-light-scattering measurements, and scanning electron microscopy had been adopted to explore the mechanism of PL enhancement of PSi particles under microwave irradiation, which is attributed to the formation of higher porosity and the growth of silicon oxide by microwave-assisted wet etching. Compared with that fabricated by ultrasonication, smaller luminescent PSi nanoparticles (average size ∼60 nm) with stronger orange-red fluorescence (PL quantum yield ∼14.8%) and higher dispersibility can be large-scale prepared for cellular imaging and drug delivery in biomedical applications.

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