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Sensors 2012, 12(6), 8176-8192; doi:10.3390/s120608176

Long-Term Outdoor Reliability Assessment of a Wireless Unit for Air-Quality Monitoring Based on Nanostructured Films Integrated on Micromachined Platforms

1
Tethis spa, via Russoli 3, Milano 20143, Italy
2
Fondazione Bruno Kessler (FBK), via Sommarive 18, Povo (Trento) 38123, Italy
3
CIMAINA and Physics Department of University of Milan, via Celoria 16, Milano 20133, Italy
4
Sensor Center Ltd.—Anturikeskus Oy, Pakkalankuja 5, Vantaa 01510, Finland
*
Author to whom correspondence should be addressed.
Received: 15 March 2012 / Revised: 31 May 2012 / Accepted: 8 June 2012 / Published: 13 June 2012
(This article belongs to the Section Physical Sensors)
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Abstract

We have fabricated and tested in long-term field operating conditions a wireless unit for outdoor air quality monitoring. The unit is equipped with two multiparametric sensors, one miniaturized thermo-hygrometer, front-end analogical and digital electronics, and an IEEE 802.15.4 based module for wireless data transmission. Micromachined platforms were functionalized with nanoporous metal-oxides to obtain multiparametric sensors, hosting gas-sensitive, anemometric and temperature transducers. Nanoporous metal-oxide layer was directly deposited on gas sensing regions of micromachined platform batches by hard-mask patterned supersonic cluster beam deposition. An outdoor, roadside experiment was arranged in downtown Milan (Italy), where one wireless sensing unit was continuously operated side by side with standard gas chromatographic instrumentation for air quality measurements. By means of a router PC, data from sensing unit and other instrumentation were collected, merged, and sent to a remote data storage server, through an UMTS device. The whole-system robustness as well as sensor dataset characteristics were continuously characterized over a run-time period of 18 months. View Full-Text
Keywords: gas sensors; metal-oxides; nanomaterials; micromachining; air monitoring; wireless network gas sensors; metal-oxides; nanomaterials; micromachining; air monitoring; wireless network
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Leccardi, M.; Decarli, M.; Lorenzelli, L.; Milani, P.; Mettala, P.; Orava, R.; Barborini, E. Long-Term Outdoor Reliability Assessment of a Wireless Unit for Air-Quality Monitoring Based on Nanostructured Films Integrated on Micromachined Platforms. Sensors 2012, 12, 8176-8192.

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