Chiang Mai Journal of Science

Simple Laboratory-made Piezoelectric Sensors for Detection of Selected Gaseous and/or Vapor Sample

Paper Type	Contributed Paper
Title	Simple Laboratory-made Piezoelectric Sensors for Detection of Selected Gaseous and/or Vapor Sample
Author	Amnat Ruangchaiwat [a], Narabhats Rannurags [a], Sukon Phanichphant [d], Boonsom Liawruangrath [b,c] and Saisunee Liawruangrath*[a,c]
Email	scislwrn@gmail.com
Abstract: A very simple laboratory made prototype piezoelectric transducer (PZT) or sensor is described using inexpensive materials and equipment easily available in Chiang Mai and in the laboratory. Initially, experiments are carried out using a single cell device constructed in this laboratory afterwards a double-cell device is modified from the prototype device for measuring gaseous / vapour contaminants in air. The PZT detectors were tested for detection of SO2 on the basis of the best known SO2 detection using triethanolamine as coating material. It was found that the dual-cell device was more sensitive to SO2 (48 Hz / ppm) than the single-cell one (6 Hz / ppm). Optimal conditions for the PZT detector were also investigated. The AT-cut quartz crystals with circular shape having thin film gold electrodes on both sides were employed. It was shown that the 10 MHz crytal coated with triethanolamine was more sentitive than the 6 MHz quartz crystal and hence the 10 MHz quartz crystal was selected as optimum. Selectivity of the PZT detector can be achieved by changing the coating materials. Under suitable conditions, choice of appropriate coating materials could be achieved for a number gaseous / vapour samples. The proposed PZT sensors using selective coatings were successfully applied for detection of SO2 and methanol with satisfactory results.
Start & End Page	782 - 792
Received Date	2014-08-08
Revised Date
Accepted Date	2014-11-24
Full Text	Download
Keyword	piezoelectric, PZT sensors, methanol, sulphur dioxide
Volume	Vol.43 No.4 (JULY 2016)
DOI
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