Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications

Lupan, O., Postica, V., Cretu, V., Wolff, N., Duppel, V., Kienle, L. and Adelung, Rainer (2016) Single and networked CuO nanowires for highly sensitive p-type semiconductor gas sensor applications Physica Status Solidi-Rapid Research Letters, 10 (3). pp. 260-266. DOI 10.1002/pssr.201510414.

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Development of high-performance p-type semiconductor based gas sensors exhibiting fast-response/recovery times with ultra-high response are of major importance for gas sensing applications. Recent reports demonstrated the excellent properties of p-type semiconducting oxide for various practical applications, especially for selective oxidation of volatile organic compounds (VOCs). In this work, sensors based on CuO nanowire (NW) networks have been successfully fabricated via a simple thermal oxidation process on pre-patterned Au/Cr pads. Our investigation demonstrates high impact of the process temperature on aspect ratio and density of copper oxide NWs. An optimal temperature for growth of thin and densely packed NWs was found to be at 425 degrees C. The fabricated sensors demonstrated ultra-high gas response by a factor of 313 to ethanol vapour (100 ppm) at an operating temperature of 250 degrees C. High stability and repeatability of these sensors indicate the efficiency of p-type oxide based gas sensors for selective detection of VOCs. A high-performance nanodevice was fabricated in a FIB-SEM system using a single CuO NW, demonstrating an ethanol response of 202 and rapid response and recovery of similar to 198 ms at room temperature. The involved gas sensing mechanism of CuO NW networks has been described. We consider that the presented results will be of a great interest for the development of higherperformance p-type semiconductor based sensors and bottomup nanotechnologies. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Document Type: Article
Additional Information: Times Cited: 6 Lupan, Oleg Postica, Vasile Cretu, Vasilii Wolff, Niklas Duppel, Viola Kienle, Lorenz Adelung, Rainer
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1002/pssr.201510414
ISSN: 1862-6254
Projects: Future Ocean
Date Deposited: 17 Mar 2017 07:05
Last Modified: 27 Feb 2018 10:33

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