通过调节半径比实现II-VI族半导体量子点二元纳米粒子超晶格的结构定向

Structure direction of II-VI semiconductor quantum dot binary nanoparticle superlattices by tuning radius ratio.

作者信息

Chen Zhuoying, O'Brien Stephen

机构信息

Department of Applied Physics & Applied Mathematics, Columbia University, 200 SW Mudd Building, 500 West 120th Street, New York, New York 10027, USA.

出版信息

ACS Nano. 2008 Jun;2(6):1219-29. doi: 10.1021/nn800129s.

DOI:10.1021/nn800129s

PMID:19206340

Abstract

We report a nanoparticle radius ratio dependent study of the formation of binary nanoparticle superlattices (BNSLs) of CdTe and CdSe quantum dots. While keeping all other parameters identical in the system, the effective nanoparticle radius ratio, gamma(eff), was tuned to allow the formation of five different BNSL structures, AlB(2), cub-NaZn(13), ico-NaZn(13), CaCu(5), and MgZn(2). For each structure, gamma(eff) is located close to a local maximum of its space-filling factor, based on a model for space filling principles. We demonstrate the ability to select specific BNSLs based solely on gamma(eff), highlighting the role of entropic forces as a driver for self-assembly.

摘要

我们报告了一项关于碲化镉（CdTe）和硒化镉（CdSe）量子点二元纳米粒子超晶格（BNSLs）形成的纳米粒子半径比依赖性研究。在保持系统中所有其他参数相同的情况下，调整有效纳米粒子半径比γ(eff)，以形成五种不同的BNSL结构，即AlB₂、立方-NaZn₁₃、二十面体-NaZn₁₃、CaCu₅和MgZn₂。对于每种结构，基于空间填充原理模型，γ(eff)位于其空间填充因子的局部最大值附近。我们展示了仅基于γ(eff)选择特定BNSLs的能力，突出了熵力作为自组装驱动力的作用。