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Graphene Oxide-Loaded SnO2 Quantum Wires with Sub-4 Nanometer Diameters for Low-Temperature H2S Gas Sensing
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-06-16 , DOI: 10.1021/acsanm.0c00826 Zhilong Song 1 , Jia Yan 1 , Jiabiao Lian 1 , Wenjie Pu 2 , Liquan Jing 2 , Hui Xu 1 , Huaming Li 1, 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-06-16 , DOI: 10.1021/acsanm.0c00826 Zhilong Song 1 , Jia Yan 1 , Jiabiao Lian 1 , Wenjie Pu 2 , Liquan Jing 2 , Hui Xu 1 , Huaming Li 1, 2
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Chemiresistive gas sensors with low power consumption, high sensitivity, and selectivity are of great significance for low-cost and efficient real-time gas detection. Herein, we present a highly sensitive and selective H2S gas sensor employing thin-layer graphene oxide (GO)-loaded sub-4 nm diameter SnO2 quantum wires (QWs) through a simple mechanical mixing process. The SnO2 QWs with the diameter smaller than 4 nm are decorated uniformly on the surface of the GO, which endows the heterostructure with high charge transport efficiency. The surface activity and adsorbed oxygen species of SnO2 QWs, and the fast charge transfer channel of the GO nanosheet, are confirmed vital to the enhanced gas-sensing properties. As demonstrated, the as-fabricated sensors exhibit an optimum gas-sensing performance for ppb-level H2S detection at 70 °C. In addition, our sensors are selectively sensitive to H2S and even show fast dynamic response and recovery kinetics toward ppb-level H2S at the high relative humidity of 85%. Moreover, GO-loaded SnO2 QWs with solution processability enable the demonstration of a paper-based flexible H2S sensor for 500 ppb H2S detection with long-term stability. This result helps us to understand that the design and synthesis of 1D SnO2 QWs/2D GO nanosheet nanocomposites will provide new paradigms for the future development of H2S-sensitive and selective materials.
中文翻译：
直径小于4纳米的石墨烯氧化物SnO 2量子线，用于低温H 2 S气体传感
具有低功耗，高灵敏度和高选择性的化学电阻式气体传感器对于低成本，高效的实时气体检测具有重要意义。在本文中，我们介绍了一种高灵敏度和选择性的H 2 S气体传感器，该传感器通过简单的机械混合过程采用了加载了薄层氧化石墨（GO）的亚4纳米直径SnO 2量子线（QWs）。直径小于4 nm的SnO 2量子阱被均匀地装饰在GO的表面，赋予异质结构以高的电荷传输效率。SnO 2的表面活性和吸附氧已经证实，量子阱和GO纳米片的快速电荷转移通道对增强气体传感性能至关重要。如图所示，所制造的传感器在70°C时对于ppb级H 2 S检测具有最佳的气体传感性能。此外，我们的传感器对H 2 S选择性敏感，甚至在相对湿度85％时，对ppb级H 2 S表现出快速的动态响应和恢复动力学。此外，具有溶液可加工性的GO负载SnO 2 QW可以演示用于500 ppb H 2 S检测的纸质柔性H 2 S传感器，并具有长期稳定性。这一结果有助于我们了解一维SnO 2的设计与合成QWs / 2D GO纳米片纳米复合材料将为H 2 S敏感和选择性材料的未来发展提供新的范例。
更新日期：2020-07-24
中文翻译：
直径小于4纳米的石墨烯氧化物SnO 2量子线，用于低温H 2 S气体传感
具有低功耗，高灵敏度和高选择性的化学电阻式气体传感器对于低成本，高效的实时气体检测具有重要意义。在本文中，我们介绍了一种高灵敏度和选择性的H 2 S气体传感器，该传感器通过简单的机械混合过程采用了加载了薄层氧化石墨（GO）的亚4纳米直径SnO 2量子线（QWs）。直径小于4 nm的SnO 2量子阱被均匀地装饰在GO的表面，赋予异质结构以高的电荷传输效率。SnO 2的表面活性和吸附氧已经证实，量子阱和GO纳米片的快速电荷转移通道对增强气体传感性能至关重要。如图所示，所制造的传感器在70°C时对于ppb级H 2 S检测具有最佳的气体传感性能。此外，我们的传感器对H 2 S选择性敏感，甚至在相对湿度85％时，对ppb级H 2 S表现出快速的动态响应和恢复动力学。此外，具有溶液可加工性的GO负载SnO 2 QW可以演示用于500 ppb H 2 S检测的纸质柔性H 2 S传感器，并具有长期稳定性。这一结果有助于我们了解一维SnO 2的设计与合成QWs / 2D GO纳米片纳米复合材料将为H 2 S敏感和选择性材料的未来发展提供新的范例。
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