Abstract
With a series of widespread applications, resistive gas sensors are considered to be promising candidates for gas detection, benefiting from their small size, ease-of-fabrication, low power consumption and outstanding maintenance properties. One-dimensional (1-D) nanomaterials, which have large specific surface areas, abundant exposed active sites and high length-to-diameter ratios, enable fast charge transfers and gas-sensitive reactions. They can also significantly enhance the sensitivity and response speed of resistive gas sensors. The features and sensing mechanism of current resistive gas sensors and the potential advantages of 1-D nanomaterials in resistive gas sensors are firstly reviewed. This review systematically summarizes the design and optimization strategies of 1-D nanomaterials for high-performance resistive gas sensors, including doping, heterostructures and composites. Based on the monitoring requirements of various characteristic gases, the available applications of this type of gas sensors are also classified and reviewed in the three categories of environment, safety and health. The direction and priorities for the future development of resistive gas sensors are laid out.
Highlights
The main composites employed in resistive gas sensors can be divided into two categories: the conductive polymers combined with metal oxide semiconductor (MOS) and the carbon materials combined with polymers, MOSs or metals
The design and optimization strategies for 1-D nanomaterials and their potential use in resistive gas sensors were discussed in detail
The application of resistive gas sensors based on 1-D nanomaterials can be mainly summarized into three categories: environmental monitoring, safety monitoring, and health monitoring
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. [13], which can convert the concentration signals of the target gases into visual signals to achieve fast and accurate gas detection for early warning For these reasons, exploring and developing high-performance gas sensors has aroused extensive interest from scientists in recent years [14]. They have large areas, materials have become a focus for researchers They have large surfacesurface areas, abundant abundant exposed active sites and high length-to-diameter ratios, enabling fast exposed active sites and high length-to-diameter ratios, enabling fast charge transfers and efficient gas-sensitive reactions, as well as greatly enhancing the sensitivity and response speed of resistive gas sensors. This article firstly concentrates on the configuration type and sensing mechanism of resistive gas sensors, and further compares the characteristics of various dimencharge transfers and efficient gas-sensitive reactions, as well as greatly enhancing the sensitivity and response speed of resistive gas sensors.
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