Aroma sensing and indoor air monitoring by quartz crystal resonators with sensory films prepared by sputtering of biomaterials and sintered polymers.
Thickness shear mode quartz-crystal resonator coated with plasma polymer films (PPFs) produced by radio-frequency sputtering of biomaterials and synthetic polymers were examined with respect to their abilities to continuously monitor indoor air. We confirmed the sensory capabilities of an array of PPF sensors to aromas emitted from essential oils at concentrations as low as the detection threshold of human olfaction. Changes in humidity induced a drift in the response curves of PPF sensors. On the contrary, volatile compounds exhibited pulse signals. The pulse signals of a D-phenylalanine sensor and a polyethylene sensor were synchronous, but the direction of the peaks was inverted in most cases. Compared with a photo-ionization detector sensor, the PPF sensors were able to detect subtle changes in the concentrations of volatile compounds in indoor air.
Seyama
Michiko
M
NTT Microsystem Integration Laboratories, NTT Corporation, 3-1 Morinosato-wakamiya, Atsugi, Kanagawa 243-0198, Japan. michiko@aecl.ntt.co.jp
Sugimoto
Iwao
I
Nakamura
Masayuki
M
D016902:Air Pollution, Indoor / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D009812:Odorants / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D011791:Quartz; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D008567:Membranes, Artificial; D011108:Polymers; D011791:Quartz