Ethylene Sensor Based on Quartz Crystal Microbalance Modified by a Silver Ion-coordinated Cellulose Acetate Membrane
Date Issued
2012
Date
2012
Author(s)
Hu, Yin-Liang
Abstract
A study of quartz crystal microbalance (QCM) modified by a silver ion (Ag+)-coordinated cellulose acetate (CA) membrane for ethylene (C2H4) monitoring is presented in this paper. Silver tetrafluoroborate (AgBF4) and cellulose acetate were dissolved in tetrahydrofuran (THF) and were spun on the surface of QCM to form the sensing membrane. Real-time detection of ethylene was carried out using the oscillator circuit and universal counter is used for data acquisition. A series of membranes with various weight percentage of AgBF4 to cellulose were fabricated and the sensitivity to ethylene was investigated. The linear dynamic range was 104 - 105ppm and the average response time was 40s. The limit of detection (LOD) is expected to be around 1000ppm, which is in the range for agricultural use.
Subjects
Gas sensor
Ethylene
QCM
Cellulose acetate
Type
thesis
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