Detection of Petroleum Gases at ppb Level Using Quartz Crystal Resonator Sensors.
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概要
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We have developed quartz crystal resonator (QCR) sensors coated with gas-sorption films produced by radio-frequency sputtering of porous sintered-polyethylene (PS-PE), polychlorotrifluoroethylene (PCTFE), and biomolecules including amino acids. We have measured the sensing capabilities of these sensors for vapors of gasoline, fuel oil, and their ingredients at ppb level. The sensing capabilities of PS-PE sensors were profoundly affected by the sputtering conditions; they were enhanced by the photo-excitation effect, and were reduced by carbonization and water treatment. The photo-excited PS-PE sensor was so sensitive that it could detect linear hydrocarbon (>C<SUB>12</SUB>) vapors below the ppb level. The time constant of the sorption curve, however, was large, indicating a slow sensing speed. Amino-acid-film-coated sensors showed poor detection capabilities and PCTFE-film-coated sensor showed negligible sensing signals for the test vapors. The PS-PR film had higher affinities for organic vapors than for water vapor, and therefore is thought to be useful for environmental sensing.
- 日本環境化学会の論文
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