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

FM Dickinson, TA Alsop, N Al-Sharif, CEM Berger, HK Datta, L. Šiller, Y Chao, EM Tuite, A Houlton, BR Horrocks

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)1573
Number of pages1
JournalThe Analyst
Volume133
Issue number11
DOIs
Publication statusPublished - 10 Aug 2008

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