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Room temperature operated flexible La-ZnO/MWCNTs sensor for ppb level carbon monoxide detection

Verma, Gulshan; Pandey, Vikas; Islam, Monsur 1; Kumar, Mahesh; Gupta, Ankur
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)


The advancement of gas sensors with ppb level concentration experiences profound challenges. In this research, Lanthanum (La)-Zinc Oxide (ZnO)/multi-walled carbon nanotubes (MWCNTs) composites were successfully fabricated and loaded on a flexible polyimide substrate where interdigitated electrodes (thickness: 300 µm and spacing: 300 µm) were prepared using a laser carbonation technique for room temperature (RT) carbon monoxide (CO) gas detection. The synthesized composites were characterized using scanning electron microscopy, energy dispersive x-ray spectroscopy, UV–visible spectrophotometry, x-ray diffraction, and Fourier transform infrared spectroscopy. When compared to the La-ZnO composite, the addition of MWCNTs on the synthesized composite-based sensor exhibited ∼8 times higher response than La-ZnO to 100 ppm CO at 27 °C. The response of the La-ZnO/MWCNTs composite sensors to 20 ppm CO was tested at six different relative humidity (RH) levels ranging from 0% to 90% in the increments of 20% RH. These sensors exhibited humidity tolerant properties, as evidenced by their responses to different humidity levels. Even when exposed to 90% RH, the sensor only showed ∼13% reduction in response compared to 0% RH, indicating that it is a humidity tolerant sensor. ... mehr

DOI: 10.1088/1361-6439/ace4d5
Zitationen: 2
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2023
Sprache Englisch
Identifikator ISSN: 0960-1317, 1361-6439
KITopen-ID: 1000161408
HGF-Programm 43.35.03 (POF IV, LK 01) Structural and Functional Behavior of Solid State Systems
Erschienen in Journal of Micromechanics and Microengineering
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 33
Heft 9
Seiten Art.-Nr.: 095003
Vorab online veröffentlicht am 17.07.2023
Schlagwörter CO gas sensor, flexible PI substrate, ppb level detection, room temperature sensing, laser carbonation
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