用激光化学气相沉积法制备出平均粒径为10～nm的a-Si3N4纳米粒子,对不同浓度的a-Si3N4纳米粒子溶液进行了紫外吸收及荧光光谱测试,并首次在3.0～4.1～eV范围发现6个荧光峰。根据吸收及荧光光谱研究其能级结构,描述了a-Si3N4纳米粒子的物理结构图像,验证了硅悬挂键≡Si0在a-Si3N4纳米粒子光谱性质中的主导作用。
Namometer sized a-Si3N4 particles of 10～nm in average diameter were obtained by Laser Induced Chemical Vapor Deposition (LICVD). The spectra of UV absorption and fluorescence of a-Si3N4 particles in different colloids were measured. Six fluorescent peaks from 3.0～eV to 4. 1～eV were found for the first time. According to the absorption and fluorescence spectra of the particles, we studied their energy level structure. We also demonstrated that silicon dangling bond ≡Si0 plays a dominant role in the spectrum character for nanometer a-Si3N4 particles.
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