Optical Gas Sensors in Analytical Chemistry: Applications, Trends and General Comments

Abstract

Current concepts for optical gas sensors are reviewed. Different approaches for gas sensing such as intrinsic and extrinsic, direct and indirect sensing were taken into consideration. For each sensing approach reviewed here, a short principle description and recent applications are given. Several aspects governing the enrichment of gaseous analytes in sensitive layers are also discussed briefly.

A Gas Sensor Design and Heat Transfer Simulation with ZnO and TiO2 Sensing Layers

“…Afterwards, gas-sensing devices are researched and examined worldwide. Researches on gas detection mechanisms is focused on designing gas detection elements that can detect gases harmful to human health and nature with high performance detection materials as a consequence various gas detection technologies have been developed for use in gas detection processes [8][9][10][11][12][13]. The working principle of MOX gas sensors are usually based on the resistivity change of the semiconductor, depending on the gas absorption.…”

A Room Temperature Nitric Oxide Gas Sensor Based on a Copper-Ion-Doped Polyaniline/Tungsten Oxide Nanocomposite

“…The demand for highly sensitive sensors featuring selectivity toward specific gases in various applications, such as industrial process control, environment protection, food safety, healthcare, and security, has increased. Several sensing technologies, including optical, electronic, and electrochemical methods, have been developed for use in various applications [ 1 , 2 , 3 ]. Nitric oxide (NO) emissions are mainly generated through the combustion of fossil fuels, and combustion that occurs in power plants and vehicle engines.…”