Diverse Adsorption/Desorption Abilities Originating from the Nanostructural Morphology of VOC Gas Sensing Devices Based on Molybdenum Trioxide Nanorod Arrays
Diverse Adsorption/Desorption Abilities Originating from the Nanostructural Morphology of VOC Gas Sensing Devices Based on Molybdenum Trioxide Nanorod Arrays
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DOI：
10.1002/admi.201600252
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发表时间：
2016-07
影响因子：
5.4
通讯作者：
Shuren Cong;T. Sugahara;Tingting Wei;J. Jiu;Y. Hirose;S. Nagao;K. Suganuma
中科院分区：
文献类型：
--
作者：
Shuren Cong;T. Sugahara;Tingting Wei;J. Jiu;Y. Hirose;S. Nagao;K. Suganuma
纳米棒阵列气体传感器由于其独特的纳米结构而具有优异的传感性能，引起了科学和工程界的广泛兴趣。在这项工作中，超细单晶α-MoO 3纳米棒阵列的大规模随机3D网络被用作气体传感器。阵列通过简单的单步溶液路线自发生长。通过调节气敏元件的电阻，研究了该气敏元件对573 K下乙醇、甲醇、异丙醇和丙酮蒸气的快速响应和明显区分。传感器的灵敏度、响应时间和恢复时间强烈地依赖于纳米棒阵列的特定形态，例如3D网络中纳米棒的长度、数量和覆盖范围。提出了一种反应机制，其中3D网络纳米棒阵列比种子层更容易吸附并与目标分子反应，以解释传感器的不同响应和恢复时间。这些具有功能可调形态的随机3D网络纳米棒阵列有希望作为检测各种蒸汽的气体传感器普遍应用，并为快速，大规模，低成本和简单合成传感设备的生产提供有价值的见解。
Nanorod arrays gas sensors are attracting much scientific and engineering interest because of their excellent sensing performance arising from their unique nanostructures. In this work, large‐scale random 3D networks of ultrafine single‐crystal α‐MoO3 nanorod arrays are applied as gas sensors. The arrays are spontaneously grown by a simple single‐step solution route. A prompt response and obvious discrimination of ethanol, methanol, isopropanol, and acetone vapors at 573 K are investigated via the modulation of the resistance of the gas sensors. The sensitivity, response time, and recovery time of the sensors strongly depend on the specific morphologies of the nanorod arrays, such as length, number, and coverage of nanorods in the 3D network. A reaction mechanism in which the 3D‐network nanorod arrays adsorb and react with the target molecules more readily than the seed layer is proposed to explain the different response and recovery times of the sensors. These random 3D‐network nanorod arrays with functionally tunable morphology are promising for universal application as gas sensors for detecting various vapors, and provide valuable insights for the production of fast, large‐scale, low‐cost, and simple synthesis of sensing devices.