Dispersions of alkyl-capped silicon nanocrystals in aqueous media: photoluminescence and ageing

Dickinson, FM, Alsop, TA, Al-Sharif, N, Berger, CEM, Datta, HK, Šiller, L., Chao, Y, Tuite, EM, Houlton, A and Horrocks, BR (2008) Dispersions of alkyl-capped silicon nanocrystals in aqueous media: photoluminescence and ageing. The Analyst, 133 (11). p. 1573. ISSN 0003-2654

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Abstract

Water-dispersible silicon nanoparticles (Si-NPs) are desirable for applications in biological techniques. A simplified method to synthesize such particles is reported here. The resulting Si-NPs are water-dispersible and luminescent. Under the excitation of UV light, the Si-NPs emit strong red light with a peak maximum at 606 nm and a quantum yield of 6%. They are highly stable, and remain so over several weeks. Fourier Transform Infrared (FTIR) spectroscopy shows a visible Si–CH2 scissoring vibration mode. Furthermore, the surface chemical bondings were confirmed by X-ray photoelectron spectroscopy (XPS). In the Si2p and C1s core levels, Si–C components are observed. The diameters of the synthesized Si-NPS as measured by atomic force microscope (AFM) are approximately 5 nm. Furthermore, the nanoparticles can be taken up by cultured cells. Fluorescence images of Si-NPs within MCF-7 human breast cancer cells show they are distributed throughout the cell tissue.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Rachel Smith
Date Deposited: 21 Mar 2011 12:07
Last Modified: 06 Nov 2018 12:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/26765
DOI: 10.1039/b801921e

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