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DEVELOPMENT OF DIMETHYL ETHER (DME) AND CARBON DIOXIDE SENSORS USING PLATINUM NANOPARTICLES AND THICK FILM TECHNOLOGY

Photinon, Kanokorn
http://rave.ohiolink.edu/etdc/view?acc_num=case1164899809

Abstract Details

2007, Doctor of Philosophy, Case Western Reserve University, Chemical Engineering.
A three-electrode based voltammetric sensor as a disposable, economical and portable sensing device was designed and fabricated using thick film technology. Without further modification of an electrode, this versatile voltammetric sensor was capable of sensing both Dimethyl Ether (DME) and carbon dioxide (CO2) only by adjusting the operating parameters. The performance can be further enhanced by hand-printed platinum nanoparticles ink onto working electrode surface. A three-fold increase in the signal output of the sensor was obtained from the electrode with the platinum nanoparticle. A DME sensor was proposed as the alternative analytical method for the measurement of mucosal blood flow, replacing the currently used gas chromatography and mass spectroscopy. Owing to the close relationship with the functioning of the respiratory system, the measurement of mucosal blood flow was physiologically and clinically important. Evaluation and characterization of this sensor was carried out over the DME concentration range of 0% v/v to 7% v/v; a linear relationship between sensor output and the DME concentrations existed with an average R2 of 0.996. The sensor reproducibility was very good with the relative standard deviation within 5%. The DME sensor was not significantly affected by the presence of CO2, a possible interference in the exhaled air. The sensing property of the CO2 sensor was explored via an anodic adsorbate stripping where the sensing output was linearly related to the CO2 presented. Optimization for the operating parameters, i.e., gas sample residence time, adsorption time, and adsorption potential for CO2 measurement, were also carried out. The sensor yielded an order of magnitude higher sensitivity than the value reported in literature and its reproducibility was within 5% relative standard deviation. Our studies showed that the non-uniformity of the crystal planes, i.e. some absorption sites that were more active than others, explained the variation of sensitivity to adsorption potential and crystallographic orientation of the platinum electrode. Stability measurement demonstrated that the decline of the active surface area and the sensitivity of the sensor were 8% and 13% over a two week period. The kinetics of CO2 adsorption was modeled under the assumption of a Langmuir adsorption, which the system strictly obeyed at low surface coverage.
Chung-Chiun Liu (Advisor)
147 p.
Engineering, Chemical
Dimethyl Ether (DME); Carbon Dioxide (CO2); Nanoparticles; Thick film; Amperometric; Anodic adsorbate stripping

Recommended Citations

Citations

  • Photinon, K. (2007). DEVELOPMENT OF DIMETHYL ETHER (DME) AND CARBON DIOXIDE SENSORS USING PLATINUM NANOPARTICLES AND THICK FILM TECHNOLOGY [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1164899809

    APA Style (7th edition)

  • Photinon, Kanokorn. DEVELOPMENT OF DIMETHYL ETHER (DME) AND CARBON DIOXIDE SENSORS USING PLATINUM NANOPARTICLES AND THICK FILM TECHNOLOGY. 2007. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1164899809.

    MLA Style (8th edition)

  • Photinon, Kanokorn. "DEVELOPMENT OF DIMETHYL ETHER (DME) AND CARBON DIOXIDE SENSORS USING PLATINUM NANOPARTICLES AND THICK FILM TECHNOLOGY." Doctoral dissertation, Case Western Reserve University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1164899809

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.