Influence of CuO nanostructures morphology on hydrogen gas sensing performances
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LUPAN, Oleg; POSTICA, Vasilie; ABABII, Nicolai; HOPPE, Mathias; CREŢU, Vasile; TIGINYANU, Ion; ŞONTEA, Victor; PAUPORTE, Thierry; VIANA, Bruno; ADELUNG, Rainer. Influence of CuO nanostructures morphology on hydrogen gas sensing performances. In: Microelectronic Engineering. 2016, nr. 164, pp. 63-70. ISSN -.
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Microelectronic Engineering
Numărul 164 / 2016 / ISSN - /ISSNe 0167-9317

Influence of CuO nanostructures morphology on hydrogen gas sensing performances


DOI: 10.1016/j.mee.2016.07.008
Pag. 63-70

Lupan Oleg123, Postica Vasilie2, Ababii Nicolai2, Hoppe Mathias1, Creţu Vasile2, Tiginyanu Ion2, Şontea Victor2, Pauporte Thierry3, Viana Bruno3, Adelung Rainer1
 
1 Institute for Material Science, Christian-Albrechts- University of Kiel,
2 Technical University of Moldova,
3 PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris
 
Disponibil în IBN: 17 decembrie 2017


Rezumat

In this study, the impact of different morphologies of p-type copper oxide nanostructures on hydrogen gas response is investigated. Sensor structures based on CuO nanowire (NW) networks demonstrated much higher gas response (~ 340) than nanostructured films (~ 3) at operating temperatures of 300 °C. Such a high gas response in the case of CuO NW networks is explained by percolating phase transition of CuO NW surface to metallic Cu. The phenomenon is observed at operating temperatures higher than 275 °C, but show good reversibility at 300 °C. At a higher operating temperature of 400 °C, the gas response was found lower (~ 108) than at 300 °C, even if the response time and percolating time were much shorter. On the other hand, the faster recovery time (~ 2 s) to the initial value of electrical baseline was observed at an operating temperature of 300 °C. This latter temperature is found the best regime for stable and highly sensitive and selective detection of hydrogen with high repeatability for sensor structures based on CuO NW networks. These results will help to take full advantage of these functional nanomaterials in the new generation of sensorial nanodevices for their larger scale utilization.

Cuvinte-cheie
CuO,

hydrogen, Nanowire,

Metallization, Percolating, Sensing mechanism