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Simultaneous Monitoring of Humidity and Chemical Changes Using Quartz Crystal Microbalance Sensors Modified with Nano-thin Films

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Abstract

Quartz crystal microbalance (QCM) electrodes modified with nano-thin films were used to develop a system for measuring significant environment changes (smoke, humidity, hazardous material release). A layer-by-layer approach was used for the deposition of sensitive coatings with a nanometer thickness on the electrode surface. The QCM electrode was modified with self-assembled alternate layers of tetrakis-(4-sulfophenyl) porphine (TSPP) (or its manganese derivative, MnTSPP) and poly(diallyldimethylammonium chloride) (PDDA). The QCM sensors, which had been reported previously for humidity sensing purposes, revealing a high possibility to recognize significant environmental changes. Identifying of the origin of environmental change is possible via differential signal analysis of the obtained data. The sensors showed different responses to humidity changes, hazardous gas (ammonia) or cigarette smoke exposure. Even qualitative analysis is not yet available; it has been shown that ventilation triggers or alarms for monitoring smoke or hazardous material release can be built using the obtained result.

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Correspondence to Seung-Woo Lee.

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This is a paper in the series of “nano-assembled thin film gas sensors”.

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Selyanchyn, R., Korposh, S., Wakamatsu, S. et al. Simultaneous Monitoring of Humidity and Chemical Changes Using Quartz Crystal Microbalance Sensors Modified with Nano-thin Films. ANAL. SCI. 27, 253–258 (2011). https://doi.org/10.2116/analsci.27.253

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  • DOI: https://doi.org/10.2116/analsci.27.253

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