Troia A, Giovannozzi A, Amato G
Thermodynamics Division, National Institute of Metrological Research, Strada delle Cacce, 91, 10135 Turin, Italy.
Ultrason Sonochem. 2009 Apr;16(4):448-51. doi: 10.1016/j.ultsonch.2008.12.014. Epub 2009 Jan 6.
Silicon quantum dots (QDs) have been prepared through ultrasound treatments of light-emitting porous silicon layers (PSL) electrochemically etched from a p(+) type crystalline silicon (c-Si). The sonication treatments allowed separating the porous fraction from the bulk of c-Si as well as to mechanically reduce their dimensions. The ultrasounds processes have been carried out in two different organic solvents (toluene and tetrahydrofuran), and allowed obtaining silicon QDs emitting light in the blue-green part of the visible spectrum (estimated QDs diameter around 5 nm). Moreover, by adding the proper chemicals in the solvents, such as alkenes, or simply paraffin oil, we have stabilized the QDs achieving surface modification and observed an effect on size reduction. Photoluminescence spectra of the QDs, TEM images and a preliminary micro-FTIR investigation of functionalised QDs will be presented in this paper.
通过对从p(+)型晶体硅（c-Si）电化学蚀刻得到的发光多孔硅层（PSL）进行超声处理，制备了硅量子点（QDs）。超声处理能够将多孔部分与块状c-Si分离，并在机械上减小其尺寸。超声过程在两种不同的有机溶剂（甲苯和四氢呋喃）中进行，从而获得了在可见光谱蓝绿色部分发光的硅量子点（估计量子点直径约为5 nm）。此外，通过在溶剂中添加适当的化学物质，如烯烃，或仅仅是石蜡油，我们稳定了量子点，实现了表面改性，并观察到了尺寸减小的效果。本文将展示量子点的光致发光光谱、透射电子显微镜（TEM）图像以及对功能化量子点的初步显微傅里叶变换红外光谱（micro-FTIR）研究。
