Influence of temperature and humidity on the detection of benzene vapor by piezoelectric crystal sensor

TL;DR

This study investigates how temperature and humidity affect the performance of a piezoelectric crystal sensor used for real-time benzene detection, highlighting environmental impacts on sensitivity and response times.

Contribution

It introduces models correlating benzene concentration with temperature and humidity, and evaluates the sensor's performance under varying environmental conditions.

Findings

Higher humidity decreases detection limits and increases response times.

Increased temperature shortens response and recovery times but reduces sensitivity.

Models for benzene detection considering environmental factors are proposed.

Abstract

The effects of temperature and humidity on the estimation of air pollution by benzene by using the piezoelectric crystal gas sensor were studied. Polyvinylchloride films were used as substrate for the immobilization of polymethylphenylsiloxane onto the electrode surface of the piezoelectric crystal. The sensing layer consisting of polymethylphenylsiloxane and polyvinylchloride was used for real-time monitoring of benzene, one of the atmospheric pollutants. According to the humidity from 35% to 75%, the upper limit of detection by this sensor was decreased and the response time and frequency recovery time for detecting benzene were long. On the other hand, as increasing the temperature, the response time and the frequency recovery time of the sensor were short, but its sensitivity got worse. The models for the correlation between the benzene concentration and temperature (or humidity) were presented.