Université de Lyon, CNRS, UMR 5270, INSA-Lyon, INL, Villeurbanne 69621, France.
Nanoscale Res Lett. 2014 Feb 24;9(1):94. doi: 10.1186/1556-276X-9-94.
Silicon nanoparticles (Si NPs) with a diameter size ranging from 4 to 8 nm were successfully fabricated. They exhibit a visible photoluminescence (PL) due to the quantum confinement effect. Chemical functionalization of these Si NPs with alkyl groups allowed to homogeneously disperse them in nonpolar liquids (NPLs). In comparison to most of literature results for Si NPs, an important PL peak position variation with temperature (almost 1 meV/K) was obtained from 303 to 390 K. The influence of the liquid viscosity on the peak positions is also presented. These variations are discussed considering energy transfer between nanoparticles. The high PL thermal sensitivity of the alkyl-capped Si NPs paves the way for their future application as nanothermometers.
成功制备了直径为 4 至 8nm 的硅纳米颗粒（Si NPs）。由于量子限制效应，它们表现出可见的光致发光（PL）。通过用烷基基团对这些 Si NPs 进行化学官能化，可以将它们均匀地分散在非极性液体（NPLs）中。与大多数 Si NPs 的文献结果相比，从 303 到 390 K 获得了重要的 PL 峰位置随温度的变化（几乎 1 meV/K）。还介绍了液体粘度对峰位置的影响。考虑到纳米颗粒之间的能量转移，对这些变化进行了讨论。烷基封端的 Si NPs 的高 PL 热灵敏度为它们作为纳米温度计的未来应用铺平了道路。
