Simple low-vacuum coating of paraffin wax on carbonaceous gas sensing layers |
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Authors: | Iwao Sugimoto Asami NagaiMasumi Okamoto |
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Affiliation: | a School of Computer Science, Tokyo University of Technology, Katakura, Hachioji, Tokyo, Japan b School of Bionics, Tokyo University of Technology, Katakura, Hachioji, Tokyo, Japan |
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Abstract: | A simple low-vacuum coater has been fabricated by using a vacuum resin degassing chamber, in which an aluminum effusion cell is heated by a soldering iron. Our developed vacuum coater presents the versatile methods for depositing paraffin wax for skin-coating the sensing layers of quartz crystal microbalance (QCM). As the increase of the cell temperature, the thickness and inhomogeneity of the wax films were increased. Impedance analyses revealed that the energy dissipation of the QCM was remarkably enhanced with the amount of wax. It was also revealed that the as-deposited wax was fluidic until coagulation by heat radiation. This surface skin coating enhanced the ethyl acetate (EA) sorption capabilities of the polyethylene-sputtered QCM sensor, whereas, it reduced the EA sorption capacity of the d-phenylalanine-sputtered QCM sensor. |
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Keywords: | Vacuum vaporization Paraffin wax Sensing layer Quartz crystal microbalance |
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