期刊
CHEMISTRY OF MATERIALS
卷 23, 期 9, 页码 2407-2418出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm200270d
关键词
nanoparticles; silicon; Si nanoparticles; one-step synthesis; melt synthesis; surface modification; surface oxide; aqueous suspension; luminescence; quantum yield; optical spectroscopy; cellular imaging
资金
- Burroughs Wellcome Fund [1007294.01]
- Oregon Nanoscience and Microtechnologies Institute [N000141010082]
- United States Air Force [FA8650-05-1-5041]
- National Center for Research Resources [RR 15583]
- NSF [DMR-0923572]
We have developed a versatile, one-step melt synthesis of water-soluble, highly emissive silicon nanopartides using bifunctional, low-melting solids (such as glutaric acid) as reaction media. Characterization through transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy shows that the one-step melt synthesis produces nanoscale Si cores surrounded by a silicon oxide shell. Analysis of the nanoparticle surface using FT-IR, zeta potential, and gel electrophoresis indicates that the bifunctional ligand used in the one-step synthesis is grafted onto the nanoparticle, which allows for tuning of the particle surface charge, solubility, and functionality. Photoluminescence spectra of the as-prepared glutaric acid-synthesized silicon nanoparticles show an intense blue green emission with a short (ns) lifetime suitable for biological imaging. These nanoparticles are found to be stable in biological media and have been used to examine cellular uptake and distribution in live N2a cells.
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