摘要
本文报道了非晶氨化硅纳米粒子的制备及量子限制效应．原始纳米粒子由激光制粉方法获得．采用有机溶剂收集保存，使团聚大幅度减弱，ＳＴＭ发现，这种样品在ＨＯＰＧ上形成平面有序六方密排结构．用ＨＦ酸处理的方法获得了更小尺寸的纳米粒于，硬团聚基本消失．非晶氮化硅纳米粒子在高ＨＦ酸浓度酒精电解质中出现晶化．我们还研究了未经ＨＦ处理的、不同尺寸样品及ＨＦ酸处理前后同一样品的吸收光谱。谱图上有吸收峰，吸收峰随粒径减少蓝移．这证明非晶氮化硅纳米粒子具有量子限制效应．
The preparation and the quantum confinement effects of amorphous St3N4 nanoparticles are reported in this paper. The initial particles are prepared by laser synthesis. When the particles are collected and preserved in organic solvent, the agglomeration between them are largely reduced, and a hexagonal closepacked structure can be found on HOPG in STM experiment with this kind of samples. The particles with even smaller size are prepaied by etching with HF acid. After erosion, the hard agglomeration is destroyed. And it is found that the amorphous show a crystallizing tendency in alcohol electrolyte with high HF acid concentration. The absorption spectra of several kinds of particles, which include as-synthesized particles with different size and the same kind of particles before and after etching, are also studied in the paper. Several peaks can be found in the spectra and the positions of the peaks shift to blue with the decrease of particle size. This shows that amorphous Si3N4 nanoparticles possess quantum confinement effects.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第3期351-358,共8页
Journal of Inorganic Materials
基金
863青年基金
关键词
氮化硅
纳米
非晶态
量子限制效应
Si_3N_4, amorphous state, nanoparticles, preparation, quantum confinement effect
