Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 1, Pages 405-413Publisher
SPRINGER
DOI: 10.1007/s11051-010-0047-7
Keywords
Silicon nanoparticles; Photoluminescence; X-ray photoelectron spectroscopy; Bio-imaging; Nanobiology; Nanomedicine
Categories
Funding
- University of East Anglia
- Royal Society [2007/R2]
- EPSRC [EP/G01664X/1]
- European Community [FP7/2007-2013, 226716]
- Engineering and Physical Sciences Research Council [EP/G01664X/1] Funding Source: researchfish
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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.
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