MOF-Based Membrane Encapsulated ZnO Nanowires for Enhanced Gas Sensor Selectivity
MOF-Based Membrane Encapsulated ZnO Nanowires for Enhanced Gas Sensor Selectivity
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DOI：
10.1021/acsami.5b12062
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发表时间：
2016-04-06
影响因子：
9.5
通讯作者：
Kim, Sang Sub
中科院分区：
文献类型：
--
作者：
Drobek, Martin;Kim, Jae-Hun;Kim, Sang Sub
气体传感器在室内和工业环境中的有毒或爆炸性气体检测、空气质量监测、医疗诊断或食品/化妆品特性控制等应用中具有很大的应用价值。在基于半导体金属氧化物（SMOs）的传感器领域，人们一直在努力改善其传感特性。在这项工作中，我们报告了一种提高SMOx纳米线传感器选择性的一般方法，该方法基于ZnO纳米线与薄ZIF-8分子筛膜的覆盖。与原始ZnO纳米线传感器相比，优化后的ZnO@ZIF-8-based纳米复合材料传感器对H-2具有明显的选择性响应，而对C7H8和C6H6的传感响应可以忽略。这种应用于纳米线传感器架构的原始mof膜封装策略为其他复杂的3D架构和需要气体或离子选择性的各种类型的应用铺平了道路，例如生物传感器，光（催化剂）和电极。
Gas sensors are of a great interest for applications including toxic or explosive gases detection in both in-house and industrial environments, air quality monitoring, medical diagnostics, or control of food/cosmetic properties. In the area of semiconductor metal oxides (SMOs)-based sensors, a lot of effort has been devoted to improve the sensing characteristics. In this work, we report on a general methodology for improving the selectivity of SMOx nanowires sensors, based on the coverage of ZnO nanowires with a thin ZIF-8 molecular sieve membrane. The optimized ZnO@ZIF-8-based nanocomposite sensor shows markedly selective response to H-2 in comparison with the pristine ZnO nanowires sensor, while showing the negligible sensing response to C7H8 and C6H6. This original MOF-membrane encapsulation strategy applied to nanowires sensor architecture pave the way for other complex 3D architectures and various types of applications requiring either gas or ion selectivity, such as biosensors, photo(catalysts), and electrodes.