Abstract

It is found using triboluminescence (TL) that nanocrystals of silicon (ncSi) with linear dimensions of about 4 nm are formed from a single crystal of silicon (Si) under friction. The time dependence of the intensity of TL signals is investigated. It consists of many superimposed signals. An analysis of their dynamics shows that nanocrystals are located on the microcrack faces formed during fracture. At the same time, a powder flies out of the friction region. Using the photoluminescence (PL) and Raman spectroscopy methods, the size of silicon nanocrystals in the powder was determined. It is about 2.2 nm. Probably, microcracks grow further in the time interval between friction and recording the Raman and PL spectra (several hours), which leads to an approximately twofold decrease in the size of nanocrystals.

中文翻译：

---

摩擦下硅纳米晶体的形成

摘要

使用三荧光发光（TL）发现，线性单晶尺寸约为4 nm的硅纳米晶（ncSi）是在摩擦下由单晶硅（Si）形成的。研究了TL信号强度的时间依赖性。它由许多叠加信号组成。对它们的动力学的分析表明，纳米晶体位于断裂过程中形成的微裂纹表面上。同时，粉末飞出摩擦区域。使用光致发光（PL）和拉曼光谱法，确定粉末中硅纳米晶体的尺寸。这是约2.2nm。可能，微裂纹在摩擦与记录拉曼光谱和PL光谱之间的时间间隔（几个小时）内进一步增长，这导致纳米晶体的尺寸减小了大约两倍。