Colorimetric Sensors for Toxic and Hazardous Gas Detection: A Review
- PDF / 2,618,532 Bytes
- 17 Pages / 595.276 x 790.866 pts Page_size
- 16 Downloads / 305 Views
REVIEW PAPER
Colorimetric Sensors for Toxic and Hazardous Gas Detection: A Review Sung Hwan Cho1 · Jun Min Suh1 · Tae Hoon Eom1 · Taehoon Kim1 · Ho Won Jang1 Received: 5 October 2020 / Accepted: 19 October 2020 © The Korean Institute of Metals and Materials 2020
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
Keywords Gas sensor · Colorimetric · Internet of Things · Fluorescent · Low power consumption · Chemical warfare agents
1 Introduction * Ho Won Jang [email protected] 1
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea
With the advent of the Internet of Things (IoT) that also called the Internet of Everything (IoE) is the network of computing device and machines and the ability to transfer data over the network, gas sensor technology has been intensively developed and researched during last decades [1, 2].
13
Vol.:(0123456789)
Before IoT era, "Classic" gas sensors based on gas chromatography (GC), mass spectrometry (MS) and ion mobility spectrometry (IMS) have been commercialized and preferred due to their stable and reliable operation despite their massive power consumption, cost, and size [3, 4]. As the importance of portable devices increases, IoT networks demand gas sensors with low power consumption, low power transmissions, and accurate sensing performance. As a result, these days, "Classic" gas sensors are no longer proper platforms to apply to IoT [5–10]. As an alternative, various gas sensor principles have been suggested, including cantilever-based gas sensors, capacitive gas sensors, thermometric gas sensors, optical gas sensors, field-effect transistor gas sensors, chemoresistive gas sensors, solid-state electrochemical gas sensors, or colorimetric gas sensors to satisfy these
Data Loading...
