Popov Mikhail, Churkin Valentin, Kirichenko Alexey, Denisov Viktor, Ovsyannikov Danila, Kulnitskiy Boris, Perezhogin Igor, Aksenenkov Viktor, Blank Vladimir
Technological Institute for Superhard and Novel Carbon Materials, Centralnaya str. 7a, Troitsk, Moscow, Russian Federation, 142190.
National University of Science and Technology MISiS, Leninskiy prospekt 4, Moscow, Russian Federation, 119049.
Nanoscale Res Lett. 2017 Oct 10;12(1):561. doi: 10.1186/s11671-017-2333-0.
Nanodiamond in a 2-5-nm size interval (which is typical for an appearance of quantum confinement effect) show Raman spectra composed of 3 bands at 1325, 1600, and 1500 cm (at the 458-nm laser excitation) which shifts to 1630 cm at the 257-nm laser excitation. Contrary to sp-bonded carbon, relative intensities of the bands do not depend on the 458- and 257-nm excitation wavelengths, and a halfwidth and the intensity of the 1600 cm band does not change visibly under pressure at least up to 50 GPa. Bulk modulus of the 2-5-nm nanodiamond determined from the high-pressure study is around 560 GPa. Studied 2-5-nm nanodiamond was purified from contamination layers and dispersed in Si or NaCl.
尺寸在2 - 5纳米区间的纳米金刚石（这是量子限制效应出现的典型尺寸）在458纳米激光激发下显示出由1325、1600和1500厘米处的3条谱带组成的拉曼光谱，在257纳米激光激发下该光谱会移至1630厘米处。与sp键合碳相反，这些谱带的相对强度不依赖于458纳米和257纳米的激发波长，并且至少在高达50吉帕的压力下，1600厘米谱带的半高宽和强度没有明显变化。通过高压研究确定的2 - 5纳米纳米金刚石的体积模量约为560吉帕。所研究的2 - 5纳米纳米金刚石是从污染层中纯化出来并分散在硅或氯化钠中的。
