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单分散性CdSe纳米晶的合成——成核及其生长过程

DOI: 10.11858/gywlxb.2008.01.003, PP. 11-14

Keywords: CdSe纳米晶,半导体纳米晶,成核,晶体生长

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Abstract:

在氩气保护下,用三辛基亚磷酸和油酸分别作为Se和Cd的配位体,在260~300℃的十八烯溶液中合成了尺寸可控的CdSe纳米晶。该纳米晶不用进行进一步的提纯和尺寸分离就具有单分散性,其量子尺寸限域效应非常明显——吸收光谱的第一吸收峰峰位随着纳米晶的长大而发生红移;该纳米晶质量很高,具有很强的发光能力,其发射光谱对称的形状和合理的Stokes频移(13nm)显示,该纳米晶的发光完全出自带隙,没有来自缺陷的发光。此外,实验结果表明,通过改变三辛基亚磷酸的浓度可以调节成核和生长的快慢,从而可以在不同的反应时间得到不同尺寸的单分散性CdSe纳米晶。

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