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Sensors 2009, 9(9), 7203-7216; doi:10.3390/s90907203

Article

Thick-Film Carbon Dioxide Sensor via Anodic Adsorbate Stripping Technique and Its Structural Dependence

Kanokorn Photinon^1,* , Shih-Han Wang²  and Chung-Chiun Liu¹

¹ Chemical Engineering Department, Case Western Reserve University, 10900 Euclid Ave., Cleveland OH 44106, USA ² Chemical Engineering Department, I-Shuo University, 1, Sec. 1, Syuecheng Rd., Dashu Township, Kaohsiung County 840, Taiwan

* Author to whom correspondence should be addressed.

Received: 30 July 2009; in revised form: 27 August 2009 / Accepted: 31 August 2009 / Published: 9 September 2009

(This article belongs to the Section Chemical Sensors)

Download PDF Full-Text [560 KB, uploaded 9 September 2009 10:59 CEST]

Abstract: A three-electrode based CO₂ sensor was fabricated using thick-film technology. The performance of this sensor was further enhanced by incorporating platinum nanoparticles onto the working electrode surface. An eight-fold increase in the signal output was obtained from the electrode with the platinum nanoparticles. The sensing output was linearly related to the CO₂ presented. Stability measurements demonstrated that the decline of the active surface area and the sensitivity of the sensor were 8% and 13%, respectively, over a two week period of time. The sensor response appeared to be a structural dependence of the crystallographic orientation of platinum electrode.

Keywords: carbon dioxide sensor; anodic adsorbate stripping; thick-film; platinum nanoparticles; structural dependence

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