(CuO-Cu2O)/ZnO:Al heterojunctions for volatile organic compound detection
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HOPPE, Mathias; ABABII, Nicolai; POSTICA, Vasilie; LUPAN, Oleg; POLONSKYI, Oleksandr; SCHUTT, Fabian; KAPS, Soren; SUKHODUB , L.; ŞONTEA, Victor; STRUNSKUS, Thomas; FAUPEL, Franz; ADELUNG, Rainer. (CuO-Cu2O)/ZnO:Al heterojunctions for volatile organic compound detection. In: Sensors and Actuators, B: Chemical. 2018, nr. 255, pp. 1362-1375. ISSN -.
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Sensors and Actuators, B: Chemical
Numărul 255 / 2018 / ISSN - /ISSNe 0925-4005

(CuO-Cu2O)/ZnO:Al heterojunctions for volatile organic compound detection

DOI: 10.1016/j.snb.2017.08.135
Pag. 1362-1375

Hoppe Mathias1, Ababii Nicolai2, Postica Vasilie2, Lupan Oleg2, Polonskyi Oleksandr1, Schutt Fabian1, Kaps Soren1, Sukhodub L.3, Şontea Victor2, Strunskus Thomas1, Faupel Franz1, Adelung Rainer1
1 Institute for Material Science, Christian-Albrechts- University of Kiel,
2 Technical University of Moldova,
3 Sumy State University
Disponibil în IBN: 25 februarie 2018


Detection and differentiation of volatile organic compounds (VOC) is highly important since these gaseous pollutants degrade the air quality and represent, even in small amounts, a threat to human health. In this work, a simple and cost-effective method to synthesize a multilayered (CuO-Cu2O)/ZnO:Al nanostructured film forming non-planar heterojunctions for efficient detection of volatile organic compound vapors is presented. While the ZnO:Al layer with different contents of Al (∼0.1 and 0.2 at%) was deposited on a glass substrate via a synthesis from chemical solutions (SCS, at a temperature <95 °C), the CuO-Cu2O composite layer was formed by sputtering a metallic thin layer of Cu on top of the ZnO:Al nanocrystalline film and subsequent thermal annealing at 425 °C. The highest gas response of ∼200% to 100 ppm to n-butanol at 350 °C operating temperature was observed in the case of a layer thickness of CuO-Cu2O ∼20 nm on top of the ZnO:Al SCS samples. In this case, the enhanced response was attributed to the involvement of (CuO-Cu2O)/ZnO:Al interface junctions in the gas sensing mechanism. This top layer allows for the formation of an additional enclosed depletion layer, which leads to a higher modulation of the CuO-Cu2O resistance and thus to a higher gas response. The (CuO-Cu2O)/ZnO:Al heterojunction also showed a reduced dependence of the sensing properties with respect to relative humidity, which is very important for ambient gas sensing applications and VOC vapor detection in human breath analysis, chemical industry, in outdoor and indoor air quality monitoring.

Copper oxide, Cu2O, VOC sensor,


Cuprite, p-Type, Tenorite, Volatile organic compound detection