Transient response curves for aromas from several kinds of alcohol such as Fruit Liquor(8%), Wine(14%), Japanese Sake(15%) and Whisky(43%) are observed using quartz-crystal-resonator gas sensor coated with synthetic-resin-film (acrylic resin, alkyd resin or urethane resin).The pattern recognition analysis using principal component analysis or neural network analysis is carried out using four parameters which characterize the transient response curves. The recognition probability of neural network for four kinds of alcohol is 100% for 20 trials.

Alkyd

Electronic Nose

10.1541/ieejsmas.117.443

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Citations (2)

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

Sensors and Actuators B Chemical (2000)

Hidehito Nanto Naganori Dougami Tatsuya Mukai Masaaki Habara Eiji Kusano

Quartz Crystal Microbalance

Hildebrand solubility parameter

Gaseous diffusion

10.1016/s0925-4005(99)00450-5

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Citations (39)

<title>Smart chemical sensor using polymer-film-coated quartz resonator for hydrocarbon and organic solvent gases</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1999)

Hidehito Nanto Naganori Dougami Tatsuya Mukai Toshio Ogawa Eiji Kusano

The copolymerized propylene-butyl of which the 'solubility parameter' almost coincides with that of hydrocarbon and organic solvent 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 gases, especially for toluene and xylene gas, suggesting that the 'solubility parameter' is effective to functional design of the sensing membrane of quartz resonator gas sensors.

Quartz Crystal Microbalance

Fused quartz

10.1117/12.337472

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Citations (1)

Hot-wire-type micromachined chemiresistive gas sensors for battery-powered city gas alarms

Japanese Journal of Applied Physics (2025)

Naganori Dougami Takéshi Miyata Taishi Orita Tadashi Nakatani Rui Kakunaka

Abstract Metal oxide semiconductor (MOX) chemiresistive gas sensors used in gas alarms have contributed to the safe use of city gas and liquid petroleum gas. In this study, we successfully fabricated hot-wire-type MOX sensors using micro-electro-mechanical systems (MEMS) technology. The hot-wire type structure, in which an electrode plays dual roles in detecting and heating, was adopted for efficient production. Owing to the miniaturization together with the thermal insulation, the sensors exhibited a fast thermal response. The average power consumption of the sensor in the pulsed operation was less than 100 μ W. The sensor exhibited high sensitivity of more than 100 mV to 3000 ppm methane and showed low cross-sensitivity to interference gases such as ethanol and hydrogen. These sensing properties were retained for more than five years, demonstrating excellent long-term stability of the sensors.

10.35848/1347-4065/ada29c

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A temperature drop on exposure to reducing gases for various metal oxide thin films

Sensors and Actuators B Chemical (2001)

Tadashi Takada Toru Maekawa Naganori Dougami

Atmospheric temperature range

10.1016/s0925-4005(01)00697-9

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Citations (7)

Modification of metal oxide semiconductor gas sensor by electrophoretic deposition

Sensors and Actuators B Chemical (2003)

Naganori Dougami Tadashi Takada

Electrophoretic Deposition

Deposition

10.1016/s0925-4005(03)00219-3

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Citations (36)

<title>Smart chemical sensors using ZnO semiconducting thin films for freshness detection of foods and beverages</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

Hidehito Nanto Toshiki Kobayashi Naganori Dougami Masaaki Habara Hajime Yamamoto

The sensitivity of the chemical sensor, based on the resistance change of Al₂O₃-doped and SnO₂-doped ZnO (ZnO:Al and ZnO:SnO₂) thin film, is studied for exposure to various gases. It is found that the ZnO:Al and ZnO:Sn thin film chemical sensor has a high sensitivity and excellent selectivity for amine (TMA and DMA) gas and ethanol gas, respectively. The ZnO:Al (5.0 wt%) thin film chemical sensor which exhibit a high sensitivity for exposure to odors from rotten sea foods, such as salmon, sea bream, oyster, squid and sardine, responds to the freshness change of these sea foods. The ZnO:SnO₂ (78 wt%) thin film chemical sensor which exhibit a high sensitivity for exposure to aroma from alcohols, such as wine, Japanese sake, and whisky, responds to the freshness change of these alcohols.

Chemical sensor

10.1117/12.320195

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