College of Sciences, Northeastern University, Shenyang 110004, China.
ACS Sens. 2024 Apr 26;9(4):1644-1655. doi: 10.1021/acssensors.4c00137. Epub 2024 Mar 19.
Chemiresistive gas sensors based on metal oxides have been widely applied in industrial monitoring, medical diagnosis, environmental pollutant detection, and food safety. To further enhance the gas sensing performance, researchers have worked to modify the structure and function of the material so that it can adapt to different gas types and environmental conditions. Among the numerous gas-sensitive materials, n-type TiO semiconductors are a focus of attention for their high stability, excellent biosafety, controllable carrier concentration, and low manufacturing cost. This Perspective first introduces the sensing mechanism of TiO nanostructures and composite TiO-based nanomaterials and then analyzes the relationship between their gas-sensitive properties and their structure and composition, focusing also on technical issues such as doping, heterojunctions, and functional applications. The applications and challenges of TiO-based nanostructured gas sensors in food safety, medical diagnosis, environmental detection, and other fields are also summarized in detail. Finally, in the context of their practical application challenges, future development technologies and new sensing concepts are explored, providing new ideas and directions for the development of multifunctional intelligent gas sensors in various application fields.
基于金属氧化物的电阻式气体传感器在工业监测、医疗诊断、环境污染物检测和食品安全等领域得到了广泛应用。为了进一步提高气体传感性能，研究人员致力于改进材料的结构和功能，使其能够适应不同的气体类型和环境条件。在众多的气体敏感材料中，n 型 TiO 半导体因其高稳定性、优异的生物安全性、可控制的载流子浓度和低制造成本而受到关注。本综述首先介绍了 TiO 纳米结构和复合 TiO 基纳米材料的传感机制，然后分析了它们的气体敏感性能与其结构和组成之间的关系，同时还重点关注了掺杂、异质结和功能应用等技术问题。还详细总结了 TiO 基纳米结构气体传感器在食品安全、医疗诊断、环境检测等领域的应用和挑战。最后，针对其实用化应用挑战，探讨了未来的发展技术和新的传感概念，为各种应用领域多功能智能气体传感器的发展提供了新的思路和方向。
