Size-Dependent Reactivity in Hydrosilylation of Silicon Nanocrystals
Size-Dependent Reactivity in Hydrosilylation of Silicon Nanocrystals
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DOI：
10.1021/ja2025189
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发表时间：
2011-06-22
影响因子：
15
通讯作者：
Veinot, Jonathan G. C.
中科院分区：
文献类型：
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作者：
Kelly, Joel A.;Shukaliak, Amber M.;Veinot, Jonathan G. C.
我们研究了纳米晶体尺寸对近紫外光化学硅氢加成中硅纳米晶体 (Si-NC) 反应活性的影响。使用 PL 和傅里叶变换红外 (FTIR) 光谱以及小角 X 射线散射 (SAXS) 评估了 Si-NC 在可见光和近红外区域具有光致发光 (PL) 的尺寸依赖性反应性。在近紫外激发下，具有可见光谱区 PL 的 Si-NC 比具有近红外 PL 的 Si-NC 反应更快，从而可以通过氢化硅烷化部分分离不同尺寸的 Si-NC 混合物。这归因于为此反应提出的激子介导机制中的量子尺寸效应。
We present an investigation into the influence of nanocrystal size on the reactivity of silicon nanocrystals (Si-NCs) in near-UV photochemical hydrosilylation. The size-dependent reactivity of Si-NCs with photoluminescence (PL) in the visible and near-infrared regions was evaluated using PL and Fourier-transform infrared (FTIR) spectroscopy, and small-angle X-ray scattering (SAXS). Under near-UV excitation, Si-NCs with PL in the visible spectral region react faster than Si-NCs with near-IR PL, allowing partial separation of a mixture of Si-NC sizes through hydrosilylation. This is attributed to quantum size effects in the exciton-mediated mechanisms proposed for this reaction.