Experimental determination of the extinction coefficient of CdTe, CdSe, and CdS nanocrystals
Experimental determination of the extinction coefficient of CdTe, CdSe, and CdS nanocrystals
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DOI：
10.1021/cm034081k
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发表时间：
2003-07-15
影响因子：
8.6
通讯作者：
Peng, XG
中科院分区：
文献类型：
--
作者：
Yu, WW;Qu, LH;Peng, XG
每摩尔纳米晶体的消光系数在第一激子吸收峰，λ，高品质的碲化镉，硒化镉，和硫化镉纳米晶体被发现是强烈依赖于纳米晶体的大小，一个平方和立方之间的依赖。使用用监测的纯化程序纯化的纳米晶体或通过受控蚀刻方法制备的纳米晶体进行测量。表面配体的性质，溶剂的折射率，纳米晶体的PL量子产率，用于纳米晶体的合成的方法，和测量的温度都没有显示出可检测的影响，对于一个给定大小的消光系数在实验误差内。
The extinction coefficient per mole of nanocrystals at the first exitonic absorption peak, epsilon, for high-quality CdTe, CdSe, and CdS nanocrystals was found to be strongly dependent on the size of the nanocrystals, between a square and a cubic dependence. The measurements were carried out using either nanocrystals purified with monitored purification procedures or nanocrystals prepared through controlled etching methods. The nature of the surface ligands, the refractive index of the solvents, the PL quantum yield of the nanocrystals, the methods used for the synthesis of the nanocrystals, and the temperature for the measurements all did not show detectable influence on the extinction coefficient for a given sized nanocrystal within experimental error.