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Exploiting Free-Standing p-CuO/n-TiO2 Nanochannels as a Flexible Gas Sensor with High Sensitivity for H2S at Room Temperature
ACS Sensors ( IF 8.2 ) Pub Date : 2021-08-31 , DOI: 10.1021/acssensors.1c01256 Haoxuan He 1 , Chenxi Zhao 1 , Jing Xu 1 , Kuanzhi Qu 1 , Zhen Jiang 1 , Zhida Gao 1 , Yan-Yan Song 1
ACS Sensors ( IF 8.2 ) Pub Date : 2021-08-31 , DOI: 10.1021/acssensors.1c01256 Haoxuan He 1 , Chenxi Zhao 1 , Jing Xu 1 , Kuanzhi Qu 1 , Zhen Jiang 1 , Zhida Gao 1 , Yan-Yan Song 1
Affiliation
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Hydrogen sulfide (H2S) is an extremely hazardous gas and is harmful to human health and the environment. Here, we developed a flexible H2S gas-sensing device operated at room temperature (25 °C) based on CuO nanoparticles coated with free-standing TiO2-nanochannel membranes that were prepared by simple electrochemical anodization. Benefiting from the modulated conductivity of the CuO/TiO2 p–n heterojunction and a unique nanochannel architecture, the traditional thermal energy was innovatively replaced with UV irradiation (λ = 365 nm) to provide the required energy for triggering the sensing reactions of H2S. Importantly, upon exposure to H2S, the p–n heterojunction is destroyed and the newly formed ohmic contact forms an antiblocking layer at the interface of CuS and TiO2, thus making the sensing device active at room temperature. The resulting CuO/TiO2 membrane exhibited a notable detection sensitivity for H2S featuring a minimum detection limit of 3.0 ppm, a response value of 46.81% against 100 ppm H2S gas, and a rapid response and recovery time. This sensing membrane also demonstrated excellent durability, long-term stability, and wide-range response to a concentration of up to 400 ppm in the presence of 40% humidity as well as outstanding flexibility and negligible change in electrical measurements under various mechanical stability tests. This study not only provides a new strategy to design a gas sensor but also paves a universal platform for sensitive gas sensing.
中文翻译：
利用独立的 p-CuO/n-TiO2 纳米通道作为在室温下对 H2S 具有高灵敏度的柔性气体传感器
硫化氢 (H 2 S) 是一种极其危险的气体，对人体健康和环境有害。在这里，我们开发了一种在室温（25°C）下操作的柔性 H 2 S 气体传感装置，该装置基于涂有通过简单电化学阳极氧化制备的独立式 TiO 2纳米通道膜的 CuO 纳米颗粒。受益于 CuO/TiO 2 p-n 异质结的调制电导率和独特的纳米通道结构，传统的热能被创新地用紫外线照射（λ = 365 nm）代替，以提供触发 H 2传感反应所需的能量S. 重要的是，在暴露于 H 2S，p-n异质结被破坏，新形成的欧姆接触在CuS和TiO 2的界面形成抗阻挡层，从而使传感装置在室温下处于活动状态。得到的 CuO/TiO 2膜对 H 2 S 表现出显着的检测灵敏度，最低检测限为 3.0 ppm，对 100 ppm H 2的响应值为 46.81%S气，并有快速的反应和恢复时间。该传感膜还表现出出色的耐用性、长期稳定性和在湿度为 40% 的情况下对高达 400 ppm 浓度的宽范围响应，以及在各种机械稳定性测试下电气测量的出色灵活性和可忽略不计的变化。该研究不仅为设计气体传感器提供了新策略，而且为灵敏气体传感铺平了通用平台。
更新日期：2021-09-24
中文翻译：
利用独立的 p-CuO/n-TiO2 纳米通道作为在室温下对 H2S 具有高灵敏度的柔性气体传感器
硫化氢 (H 2 S) 是一种极其危险的气体，对人体健康和环境有害。在这里，我们开发了一种在室温（25°C）下操作的柔性 H 2 S 气体传感装置，该装置基于涂有通过简单电化学阳极氧化制备的独立式 TiO 2纳米通道膜的 CuO 纳米颗粒。受益于 CuO/TiO 2 p-n 异质结的调制电导率和独特的纳米通道结构，传统的热能被创新地用紫外线照射（λ = 365 nm）代替，以提供触发 H 2传感反应所需的能量S. 重要的是，在暴露于 H 2S，p-n异质结被破坏，新形成的欧姆接触在CuS和TiO 2的界面形成抗阻挡层，从而使传感装置在室温下处于活动状态。得到的 CuO/TiO 2膜对 H 2 S 表现出显着的检测灵敏度，最低检测限为 3.0 ppm，对 100 ppm H 2的响应值为 46.81%S气，并有快速的反应和恢复时间。该传感膜还表现出出色的耐用性、长期稳定性和在湿度为 40% 的情况下对高达 400 ppm 浓度的宽范围响应，以及在各种机械稳定性测试下电气测量的出色灵活性和可忽略不计的变化。该研究不仅为设计气体传感器提供了新策略，而且为灵敏气体传感铺平了通用平台。
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