Department of Engineering Science, National Cheng Kung University, Tainan 701401, Taiwan.
Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei 106344, Taiwan.
ACS Sens. 2024 Nov 22;9(11):5856-5865. doi: 10.1021/acssensors.4c01397. Epub 2024 Sep 18.
In response to the urgent need for advanced climate change mitigation tools, this study introduces an innovative CO gas sensor based on p-p-type heterostructures designed for effective operation at room temperature. This sensor represents a significant step forward, utilizing the synergistic effects of p-p heterojunctions to enhance the effective interfacial area, thereby improving sensitivity. The incorporation of CuO nanoparticles and rGO sheets also optimizes gas transport channels, enhancing the sensor's performance. Our CuO/rGO heterostructures, with 5 wt % rGO, have shown a notable maximum response of 39.6-500 ppm of CO at 25 °C, and a low detection limit of 2 ppm, indicating their potential as high-performance, room-temperature CO sensors. The prepared sensor demonstrates long-term stability, maintaining 98% of its initial performance over a 30-day period when tested at 1-day intervals. Additionally, the sensor remains stable under conditions of over 40% relative humidity. Furthermore, a first-principles study provides insights into the interaction mechanisms with CO molecules, enhancing our understanding of the sensor's operation. This research contributes to the development of CO monitoring solutions, offering a practical and cost-effective approach to environmental monitoring in the context of global climate change efforts.
针对先进的气候变化缓解工具的迫切需求，本研究引入了一种基于 p-p 型异质结构的创新 CO 气体传感器，旨在实现室温下的有效运行。该传感器是向前迈出的重要一步，利用 p-p 异质结的协同效应来增加有效界面面积，从而提高灵敏度。CuO 纳米粒子和 rGO 片的引入还优化了气体传输通道，增强了传感器的性能。我们的 CuO/rGO 异质结构，在 5wt%rGO 的情况下，在 25°C 下对 500ppm 的 CO 表现出显著的最大响应 39.6-500ppm，检测限低至 2ppm，表明其具有作为高性能、室温 CO 传感器的潜力。所制备的传感器表现出长期稳定性，在 30 天的测试期间，每隔一天测试一次，其初始性能保持在 98%。此外，该传感器在相对湿度超过 40%的条件下仍然稳定。此外，第一性原理研究提供了对与 CO 分子相互作用机制的深入了解，增强了我们对传感器工作原理的理解。这项研究为 CO 监测解决方案的开发做出了贡献，为全球气候变化努力背景下的环境监测提供了一种实用且具有成本效益的方法。
