Tunable electronic properties by ligand coverage control in PbS nanocrystal assemblies
Tunable electronic properties by ligand coverage control in PbS nanocrystal assemblies
复制标题
通过控制 PbS 纳米晶体组件中的配体覆盖度来调节电子特性
DOI：
10.1039/c9nr07101f
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发表时间：
2019
期刊：
影响因子：
6.7
通讯作者：
Iwasa Yoshihiro
中科院分区：
文献类型：
--
作者：
Liu Liming;Bisri Satria Zulkarnaen;Ishida Yasuhiro;Aida Takuzo;Iwasa Yoshihiro
众所周知，通过在NC表面上使用各种类型的配体，可以实现对NC组装体的电子性质的控制。然而，配体覆盖度，这也可以调整电子性质，总是被忽视。这是由于缺乏准确的评价方法的配体的数量在纳米表面的纳米粒子和配体结合控制的困难。在这里，我们展示了一个精确的配体（油酸）覆盖控制PbS NC通过修改后的液体/空气组装技术。通过这种方式，可以同时通过配体覆盖度来调节组装结构和电子性质。特别是，形成PbS NC的正方形晶格的中等油酸覆盖率（2.1配体/nm 2）显示出最好的电子性质，特别是当与NC表面上油酸的全覆盖率（2.4配体/nm 2）和稀疏覆盖率（0.7配体/nm 2）相比时。这种配体覆盖率控制的NC薄膜的电子性能将提供新的见解，微调基于NC的电子器件的性能。
It is well-known that controlling electronic properties of nanocrystal (NC) assemblies can be achieved by the usage of various types of ligands on the NC surface. However, the ligand coverage, which could also tune electronic properties, is always ignored. It is due to the lack of accurate evaluation methods of ligand amounts on the surface of NCs and the difficulty of ligand binding control at the nanoscale. Here, we demonstrate a precise ligand (oleic acid) coverage control of PbS NCs through a modified liquid/air assembly technique. In this way, both the assembly structures and electronic properties can be tuned by ligand coverage at the same time. In particular, the medium oleic acid coverage (2.1 ligand per nm2), which forms a square lattice of PbS NCs, shows the best electronic properties, especially when it is compared with the full coverage (2.4 ligand per nm2) and the sparse coverage (0.7 ligand per nm2) of oleic acid on the NC surface. This ligand coverage controlled electronic properties of NC films will give new insights for finely tuning the properties of electronic devices based on NCs.