Abstract

Two kinds of SiC nanowires exhibiting different structures were fabricated by carbothermal reduction method and subsequent wet chemical etching. Strong and tunable ultraviolet to green emission peaks emerged in the photoluminescence spectra of both kinds of SiC nanowires in water and ethanol suspensions with the increase of excitation wavelength from 260 nm to 480 nm. The strong and distinctive ultraviolet emission originates from the quantum confinement effect of the nanoplatelets with a thickness less than 3 nm and the effects of Si–OH and Si–OR (R: ethoxy group) on the SiC nanowire surface. The blue emission derived from the SiC nanowires in different solvents is due to the combined effect of the nanoplatelet thickness, which meets the theoretical prediction value (3–5.4 nm), and surface bonds. The weaker green emission can be attributed to the large SiC nanowires and surface bonds caused by Si–OR and Si–OH.

抽象的

通过碳热还原法及其后的湿法化学刻蚀，制备了两种结构不同的SiC纳米线。随着激发波长从260 nm增加到480 nm，两种SiC纳米线在水和乙醇悬浮液中的光致发光光谱中均出现了强烈且可调谐的紫外至绿色发射峰。强烈而独特的紫外线发射源于厚度小于3 nm的纳米片的量子限制效应以及SiC纳米线表面上的Si-OH和Si-OR（R：乙氧基）的影响。SiC纳米线在不同溶剂中产生的蓝色发射是由于纳米片厚度的组合所致，该厚度满足理论预测值（3–5.4 nm）和表面键合。