Tatsuya Mukai

Novel gas sensor using polymer-film-coated quartz resonator for environmental monitoring

Abstract The functional design of the smart electronic nose using polymer-film-coated quartz resonator gas sensors, based on the solubility parameter of sensing membrane and gases, is carried out in order to develop a sensor with excellent selectivity and high sensitivity for harmful gases such as toluene, acetaldehyde and ammonia gases. The polymer films such as propylene-butyl, polycarbonate and acrylic-resin of which the solubility parameter almost coincide with that of toluene, acetaldehyde and ammonia gases, respectively, are chosen as a sensing membrane material coated on the quartz resonator. It is found that propylene-butyl-film-coated quartz resonator gas sensor exhibits a high sensitivity and an excellent selectivity for toluene and p -xylene gas, as expected from a functional design based on solubility parameter. It is also found that polycarbonate-film-coated and acrylic-resin film-coated sensors exhibit high sensitivity and excellent selectivity for acetaldehyde and ammonia, respectively, also as expected. The results strongly suggest that solubility parameter is effective in the functional design of the sensing membrane of quartz resonator gas sensors. The successful identification of a specific gas is possible through the principal component pattern recognition analysis of the transient responses of each sensor for gases.

A smart gas sensor using polymer-film-coated quartz resonator microbalance

Abstract The copolymerized propylene–butyl, of which the “solubility parameter” almost coincides with that of harmful gases such as toluene, xylene, diethyether, chloroform and acetone, is chosen as a material of the sensing membrane coated on the quartz resonator. It is found that copolymerized propylene–butyl-film-coated quartz resonator microbalance gas sensor exhibits high sensitivity and excellent selectivity for these harmful gases, especially for toluene and xylene gas, suggesting that the “solubility parameter” is effective to the functional design of the sensing membrane of quartz resonator gas sensors.

Smart electronic nose using polymer-film-coated quartz resonator gas sensor for identification of harmful gases

The functional design of the smart electronic nose using polymer-film coated quartz resonator gas sensors, based on the solubility parameter of sensing membrane and gases, is carried out in order to develop the sensor with excellent selectivity and high sensitivity for harmful gases such as toluene, acetaldehyde and ammonia gases. The polymer-films such as propylene-butyl, poly-carbonate and acrylic-resin of which the solubility parameter almost coincide with that of toluene, acetaldehyde and ammonia gases, respectively, are chosen as a sensing membrane material coated on the quartz resonator. It is found that propylene-butyl-film coated quartz resonator gas senor exhibits a high sensitivity and an excellent selectivity for toluene and p-xylene gas, as it is expected from the functional design based on the solubility parameter. It is also found that poly-carbonate- film coated sensor and acrylic-resin-film coated sensor exhibit high sensitivity and excellent selectivity for acetaldehyde and ammonia, respectively, as it is also expected. The results strongly suggest that the solubility parameter is effective to functional design of the sensing membrane of quartz resonator gas sensors. The identification of gas kind is successfully possible by the principal component pattern recognition analysis of the transient response of the each sensor for gases.