Electrochemical Sensors for Monitoring of Indoor and Outdoor Air Pollution

Abstract

This chapter aims a comprehensive presentation of the most common electrochemical sensors used in the real monitoring applications of air purity testing. Oxygen, hydrogen, hydrogen sulfide, nitrogen oxides, carbon monoxide and carbon dioxide are gases, which can be accurately detected and measured. Too high or too low oxygen concentration levels make the air improper for breathing. Hydrogen sulfide and carbon monoxide are dangerous species; any leakage needs to be pinpointed. A calibrated network of sensors for monitoring gas detection makes it possible to easily locate the source of gas escape during indoor air monitoring. The air quality monitoring stations based on electrochemical sensors are nowadays used to determine the global pollution index of the atmospheric air, in order to prevent the risks toward the human health and damage of environment, especially in the highly populated and industrialized urban areas.

Graphene-based Materials in Gas Sensor Applications: A Review

“…The electrochemical gas sensor allows an analyte gas to pass through a membrane at an electrode where it is reduced or oxidized. (25) It measures gases at relatively low concentrations and is capable of detecting a wide range of different gases. The electrochemical gas sensor can be in either a two-or three-electrode configuration.…”

“…The semiconductor metal oxide sensing material translates this interaction into changes in electronic charge density and charge carrier mobility. (25) As a result, there is a change of the electrical signal. Most electrochemical gas sensors are amperometric sensors, where the change in current indicates the rate of the electrolytic process in the sensing material.…”

“…Most electrochemical gas sensors are amperometric sensors, where the change in current indicates the rate of the electrolytic process in the sensing material. (25) In recent years, there have been a significant number of publications regarding the use of graphene as an electrochemical gas sensor. The incorporation of graphene enhances the properties of conventional sensing materials by transferring its unique properties into the sensor.…”

Indoor Air Pollutants and the Future Perspectives for Living Space Design

“…The main types of indoor pollutants are screened below, and methods for their diction were previously published by the authors in "Electrochemical Sensors for Monitoring of Indoor and Outdoor Air Pollution" [15].…”

Analytic Optimization of Cantilevers for Photoacoustic Gas Sensor with Capacitive Transduction

“…In TDLS the detected signal is proportional to the length of the optical path while in photoacoustic spectroscopy, it is related to the laser emitted power, which allows keeping a high sensitivity even in a compact gas cells. [9] Industrial applications and civil use [10] (a) Remote air quality monitoring; (b) Gas leak detection systems; (c) High-end market applications. [10] e-excellent, g-good, p-poor, b-bad In photoacoustic spectroscopy, a modulated laser emitting at a wavelength corresponding to the absorption line of a targeted gas species is focused into a gas chamber.…”