Effect of light activation on chemical gas sensors based on aligned nanowires

C. Baratto, V. Golovanova, G. Faglia, Thi Thanh Le Dang, H. Hakola, T. Niemi, N. Tkachenko, B. Nazarchurk, V. Golovanov

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


We investigated the effect of light activation on the gas sensors based on aligned nanowires (NWs). Due to almost monocrystalline perfection, NWs exhibit excellent chemical and thermal stability that makes them superior to polycrystalline thin-film sensors. Nanowires were aligned in two different ways: using Langmuir-Blodgett technique on a chip with electrodes being two microns apart, and using hydrothermal growth procedure to obtain inter-crossed nanowires. Our objective was to fabricate multiple aligned nanowire sensors that could mimic the advantages of a single NW sensors, but benefiting from a macroscopic alignment procedure that avoid the use of lithography for making contacts on a single nanowire. In the present study, we investigated the effects of illumination wavelength (sub and supra band-gap) on the sensing capabilities of the developed structures at room temperature. Light activated devices were found effective for NO2 sensing, while no interference to ethanol and relative humidity was observed.

Original languageEnglish
Title of host publicationIEEE Sensors, SENSORS 2020 - Conference Proceedings
Number of pages4
ISBN (Electronic)9781728168012
ISBN (Print)9781728168029
Publication statusPublished - 2020
Publication typeA4 Article in conference proceedings
EventIEEE SENSORS - Virtual, Rotterdam, Netherlands
Duration: 25 Oct 202028 Oct 2020

Publication series

NameProceedings of IEEE Sensors
ISSN (Print)1930-0395
ISSN (Electronic)2168-9229


CityVirtual, Rotterdam


  • aligned NWs
  • gas sensing
  • light activation
  • NO
  • ZnO

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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