Reversible Electrochemical Gelation of Metal Chalcogenide Quantum Dots
Reversible Electrochemical Gelation of Metal Chalcogenide Quantum Dots
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DOI：
10.1021/jacs.0c03156
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发表时间：
2020-07-15
影响因子：
15
通讯作者：
Luo, Long
中科院分区：
文献类型：
--
作者：
Hewa-Rahinduwage, Chathuranga C.;Geng, Xin;Luo, Long
决定量子点 (QD) 组装的能力对于将其集成到固态电子和光电器件中至关重要。然而，目前缺乏能够实现量子点之间有效电子通信、促进反应表面并保留量子点固有量子限制特性的组装方法。在这里，我们介绍了一种通用且简便的电化学凝胶方法，用于将金属硫族化物量子点（如 CdS、ZnS 和 CdSe 所示）组装成宏观 3D 连接的孔隙物质纳米结构，该结构保持量子限制，并且每个量子点均可与环境接触。由于凝胶网络中量子点结构单元之间的键合具有氧化还原活性，因此电凝胶化过程是可逆的。我们进一步展示了这种电凝胶方法在一步制造 CdS 凝胶气体传感器中的应用，生产出在室温下具有卓越性能的 NO2 气体传感装置，从而能够开发低成本、灵敏且可靠的空气质量监测装置。
The ability to dictate the assembly of quantum dots (QDs) is critical for their integration into solid-state electronic and optoelectronic devices. However, assembly methods that enable efficient electronic communication between QDs, facilitate access to the reactive surface, and retain the native quantum confinement characteristics of the QD are lacking. Here we introduce a universal and facile electrochemical gelation method for assembling metal chalcogenide QDs (as demonstrated for CdS, ZnS, and CdSe) into macroscale 3-D connected pore-matter nanoarchitectures that remain quantum confined and in which each QD is accessible to the ambient. Because of the redox-active nature of the bonding between QD building blocks in the gel network, the electrogelation process is reversible. We further demonstrate the application of this electrogelation method for a one-step fabrication of CdS gel gas sensors, producing devices with exceptional performance for NO2 gas sensing at room temperature, thereby enabling the development of low-cost, sensitive, and reliable devices for air quality monitoring.