Alternative routes toward high quality CdSe nanocrystals
Alternative routes toward high quality CdSe nanocrystals
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DOI：
10.1021/nl0155532
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发表时间：
2001-06-01
期刊：
影响因子：
10.8
通讯作者：
Peng, XG
中科院分区：
文献类型：
--
作者：
Qu, LH;Peng, ZA;Peng, XG
不同种类的安全、普通和低成本的化合物被证明是合成高质量CdSe纳米晶体的良好溶剂/前驱体。通过这些替代途径合成的CdSe纳米晶体的尺寸、形状和晶体结构可以在非常宽的尺寸范围内可控地变化，从约1.5 nm到25 nm以上。在不进行粒度分选的情况下，纤锌矿纳米晶体在小于15 nm的粒径范围内的粒径分布可以很容易地控制在5-10%的相对标准偏差之内。纳米晶体的最高光致发光量子效率可达20-30%。发现Cd(Ac)(2)和脂肪酸分别是最通用的镉前体和溶剂/配体。当体系中含有来自强酸的阴离子（无论是镉前体还是镉配体）时，当前体系中合成高质量CdSe纳米晶体是不可行的。实验结果表明，高质量胶体纳米晶体的合成远没有想象的那么精细。
Different kinds of safe, common, and low-cost compounds were proven to be good solvents/precursors for the synthesis of high quality CdSe nanocrystals. The size, shape, and crystal structure of CdSe nanocrystals synthesized by these alternative routes can be varied in a controllable manner in a very broad size range, from about 1.5 nm to above 25 nm. Without any size sorting, the size distribution of the wurtzite nanocrystals in the size range smaller than about 15 nm can be readily controlled as narrow as with 5-10% relative standard deviation. The highest photoluminescence quantum efficiency of the nanocrystals was up to 20-30%. Cd(Ac)(2) and fatty acids were found to be the most versatile cadmium precursor and solvent/ligand, respectively. The synthesis of high quality CdSe nanocrystals in the current systems is not feasible when the system contains any anions from a strong acid, either in the form of a cadmium precursor or as an added cadmium ligand. The experimental results indicate that the synthesis of high quality colloidal nanocrystals is far less delicate than it has been thought to be.