Abstract

Since the industries are vastly rising, the threat of toxic and hazardous substance to human beings and demands of the accurate sensor is increasing. Colorimetric sensors that detect substances by measuring the absorbance or fluorescence spectra shift are one of the most emerging strategies these days. However, conventional colorimetric gas sensors are limited to specific application due to the limitation of detecting only liquid phase substances. For practical applications of the colorimetric sensors, it is necessary to detect low concentrations of toxic and hazardous substances in gaseous media. Besides, operation with low power consumption and excellent selectivity and sensitivity should be considered for Internet of Things (IoT) application. In this paper, various efforts on the investigation of several materials, including dyes, polymers, metal–organic complexes, and metal oxides as active sensor elements of the colorimetric gas sensors for IoT application are summarized. This paper also reviews various kinds of colorimetric gas sensor that exhibit great sensing properties to toxic and hazardous gases and introduce a brief overview of the challenges of colorimetric gas sensors as a candidate for future IoT gas sensor technology.

Graphic abstract

中文翻译：

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用于毒性和有害气体检测的比色传感器：综述

摘要

由于工业正在迅速发展，因此有毒有害物质对人类的威胁以及对精确传感器的需求正在增加。通过测量吸光度或荧光光谱偏移来检测物质的比色传感器是当今最新兴的策略之一。然而，由于仅检测液相物质的限制，常规比色气体传感器限于特定应用。对于比色传感器的实际应用，必须检测气态介质中低浓度的有毒有害物质。此外，对于物联网（IoT）应用，应考虑低功耗，出色的选择性和灵敏度。在本文中，我们为研究多种材料（包括染料，聚合物，总结了金属-有机配合物和金属氧化物作为用于物联网应用的比色气体传感器的有源传感器元素。本文还回顾了各种比色气体传感器，它们对有毒有害气体具有出色的传感特性，并简要概述了比色气体传感器作为未来物联网气体传感器技术的候选者所面临的挑战。

图形摘要