奥斯特瓦尔德成熟
量子点
硫系化合物
材料科学
单层
超晶格
纳米技术
化学工程
钝化
化学物理
化学
光电子学
图层(电子)
工程类
作者
Changwang Zhang,Yong Xia,Zhiming Zhang,Zhen Huang,Linyuan Lian,Xiangshui Miao,Daoli Zhang,Matthew C. Beard,Jianbing Zhang
标识
DOI:10.1021/acs.chemmater.7b00411
摘要
A new strategy for narrowing the size distribution of colloidal quantum dots (QDs) was developed by combining cation exchange and quantized Ostwald ripening. Medium-sized reactant CdS(e) QDs were subjected to cation exchange to form the target PbS(e) QDs, and then small reactant CdS(e) QDs were added which were converted to small PbS(e) dots via cation exchange. The small-sized ensemble of PbS(e) QDs dissolved completely rapidly and released a large amount of monomers, promoting the growth and size-focusing of the medium-sized ensemble of PbS(e) QDs. The addition of small reactant QDs can be repeated to continuously reduce the size distribution. The new method was applied to synthesize PbSe and PbS QDs with extremely narrow size distributions and as a bonus they have hybrid surface passivation. The size distribution of prepared PbSe and PbS QDs are as low as 3.6% and 4.3%, respectively, leading to hexagonal close packing in monolayer and highly ordered three-dimensional superlattice.
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