University of Trento, Department of Industrial Engineering, Via Sommarive 9, I-38123 Trento, Italy.
Nanotechnology. 2019 Jun 21;30(25):255601. doi: 10.1088/1361-6528/ab0cc8. Epub 2019 Mar 5.
We report the first synthesis of silicon nanocrystals embedded in a silicon nitride matrix through a direct pyrolysis of a preceramic polymer (perhydropolysilazane). Structural analysis carried out by XRD, XPS, Raman and TEM reveals the formation of silicon quantum dots and correlates the microstructures with the annealing temperature. The photoluminescence of the nanocomposites was investigated by both linear and nonlinear measurements. Furthermore we demonstrate an enhanced chemical resistance of the nitride matrix, compared to the typical oxide one, in both strongly acidic and basic environments. The proposed synthesis via polymer pyrolysis is a striking innovation potentially allowing a mass-scale production nitride embedded Si nanocrystals.
我们报告了通过先驱体聚合物（聚硅氮烷）的直接热解，首次合成了嵌入氮化硅基质中的硅纳米晶体。通过 XRD、XPS、拉曼和 TEM 进行的结构分析揭示了硅量子点的形成，并将微观结构与退火温度相关联。通过线性和非线性测量研究了纳米复合材料的光致发光。此外，与典型的氧化物相比，我们证明了氮化物基质在强酸和强碱环境中的化学稳定性得到了增强。通过聚合物热解进行的这种合成方法是一项显著的创新，有可能实现大规模生产嵌入氮化硅的硅纳米晶体。
