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1 前言粒径为几纳米的金属和半导体微粒子与其块状材料相比具有非常独特的物理、化学性能,在从块状体到原子、分子的所谓介观领域,随着尺寸不同其特性发生很大变化。例如,在可见光领域不发射荧光的块状间接迁移型半导体硅,经过纳米粒度化后发现随着粒度不同而发射不同波长的荧光;Cds和CdSe等化合物半导体纳米粒
1 Introduction Metal and semiconductor particles with a particle size of a few nanometers have very unique physical and chemical properties compared with their bulk materials. Their properties vary from the lump to the so-called mesoscopic area of molecules and molecules with different sizes Big change. For example, bulk indirect transfer type semiconductor silicon which does not emit fluorescence in the visible light region is found to emit different wavelengths of fluorescence with different particle sizes after being nano-sized; compound semiconductor nanoparticles such as Cds and CdSe