Effect of Metal Ions on Photoluminescence, Charge Transport, Magnetic and Catalytic Properties of All-Inorganic Colloidal Nanocrystals and Nanocrystal Solids
Effect of Metal Ions on Photoluminescence, Charge Transport, Magnetic and Catalytic Properties of All-Inorganic Colloidal Nanocrystals and Nanocrystal Solids
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DOI：
10.1021/ja301285x
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发表时间：
2012-08-22
影响因子：
15
通讯作者：
Talapin, Dmitri V.
中科院分区：
文献类型：
--
作者：
Nag, Angshuman;Chung, Dae Sung;Talapin, Dmitri V.
胶体半导体纳米晶体（NC）为溶液处理的太阳能电池、发光器件、光催化系统等提供了方便的“构建块”。将无机配体用于胶体NC显著改善了NC间的电荷传输，使得基于NC的器件能够快速发展。典型的无机配体（例如，Sn 2S 64-、S2-）由共价结合到亲电金属表面位点的带负电荷的离子表示。无机带电物质与NC表面的结合提供了NC胶体在极性溶剂中的静电稳定性，而不会在NC之间引入绝缘屏障。在这项工作中，我们表明，NC表面电荷的静电平衡所需的阳离子物种也可以用于工程几乎所有的属性的所有无机NC和NC固体，包括光致发光效率，电子迁移率，掺杂，磁化率，和电催化性能。我们使用了一套实验技术来阐明各种金属离子对所有无机纳米材料特性的影响，并开发了工程和优化纳米材料的策略
Colloidal semiconductor nanocrystals (NCs) provide convenient "building blocks" for solution processed solar cells, light emitting devices, photocatalytic systems, etc The use of inorganic ligands for colloidal NCs dramatically improved inter-NC charge transport, enabling fast progress in NC-based devices. Typical inorganic ligands (e g, Sn2S64-, S2-) are represented by negatively charged ions that bind covalently to electrophilic metal surface sites. The binding of inorganic charged species to the NC surface provides electrostatic stabilization of NC colloids in polar solvents without introducing insulating barriers between NCs. In this work we show that cationic species needed for electrostatic balance of NC surface charges can also be employed for engineering almost every property of all-inorganic NCs and NC solids, including photoluminescence efficiency, electron mobility, doping, magnetic susceptibility, and electrocatalytic performance. We used a suite of experimental techniques to elucidate the impact of various metal ions on the characteristics of all inorganic NCs and developed strategies for engineering and optimizing NC-based materials