一种制备氢封端硅纳米颗粒的新方法：合成、功能化及水稳定性
A New Solution Route to Hydrogen Terminated Silicon Nanoparticles: Synthesis, Functionalization, and Water Stability.
作者信息
Zhang Xiaoming, Neiner Doinita, Wang Shizhong, Louie Angelique Y, Kauzlarich Susan M
机构信息
Department of Chemistry, University of California, Davis, CA 95616 ; Department of Biomedical Engineering, University of California, Davis, CA 95616.
Department of Chemistry, University of California, Davis, CA 95616.
出版信息
Nanotechnology. 2007 Jan 24;18(9):095601-95601. doi: 10.1088/0957-4484/18/9/095601.
Hydrogen capped silicon nanoparticles with strong blue photoluminescence were synthesized by the metathesis reaction of sodium silicide, NaSi, with NHBr. The hydrogen capped Si nanoparticles were further terminated with octyl groups and then coated with a polymer to render them water soluble. The nanoparticles were characterized by TEM, FT-IR, UV-VIS absorption, and photoluminescence. The Si nanoparticles were shown to have an average diameter of 3.9 ±1.3 nm and exhibited room-temperature photoluminescence with a peak maximum at 438 nm with a quantum efficiency of 32% in hexane and 18% in water; the emission was stable in ambient air for up to 2 months. These nanoparticles could hold great potential as a non-heavy element containing quantum dot for applications in biology.
通过硅化钠（NaSi）与NHBr的复分解反应合成了具有强蓝光光致发光的氢封端硅纳米颗粒。氢封端的硅纳米颗粒进一步用辛基封端，然后用聚合物包覆以使其具有水溶性。通过透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见吸收光谱和光致发光对纳米颗粒进行了表征。结果表明，硅纳米颗粒的平均直径为3.9±1.3 nm，在室温下具有光致发光特性，在己烷中的最大发射峰位于438 nm处，量子效率为32%，在水中为18%；其发射在环境空气中可稳定长达2个月。这些纳米颗粒作为一种不含重金属元素的量子点在生物学应用中具有巨大潜力。
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