All villi-like metal oxide nanostructures-based chemiresistive electronic nose for an exhaled breath analyzer

Hi Gyu Moon, Youngmo Jung, Soo Deok Han, Young Seok Shim, Woo Suk Jung, Taikjin Lee, Seok Lee, Jung Han Park, Seung Hyub Baek, Jin Sang Kim, Hyung Ho Park, Chulki Kim, Chong Yun Kang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Chemiresistive electronic nose (CEN) composed of villi-like nanostructures (VLNs) of SnO2 and WO3, and Au-functionalized VLNs was fabricated by applying electron-beam evaporation in a glancing angle deposition mode. The VLNs-based CEN with a back-heater (212 °C) shows high responses with low detection limits of parts per billion (ppb)-levels for NO and NH3 vapors at 80% relative humidity atmosphere. The enhanced sensitivities in a high humidity condition turn out to be attributed to the spillover effect by the Au nanoparticles and a large surface-to-volume ratio in porous VLNs. Employing Au NPs on VLNs leads to the increase of O ions via the spillover effect which impedes the adsorption of water molecules, maintaining the enhanced responses against environmental humidity. Consequently, high responses for NO and NH3 vapors maintain even in the high humidity condition. Herein, with the principal component analysis (PCA), we demonstrate highly selective detection of NO and NH3 vapors against C2H5OH, CO, C7H8, C6H6, and CH3COCH3 vapors. These results open up wide applications of the VLNs-based CEN as an inexpensive and non-invasive diagnostic tool for asthma and kidney disorder.

Original languageEnglish
Pages (from-to)295-302
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume257
DOIs
Publication statusPublished - 2018 Mar

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Moon, H. G., Jung, Y., Han, S. D., Shim, Y. S., Jung, W. S., Lee, T., Lee, S., Park, J. H., Baek, S. H., Kim, J. S., Park, H. H., Kim, C., & Kang, C. Y. (2018). All villi-like metal oxide nanostructures-based chemiresistive electronic nose for an exhaled breath analyzer. Sensors and Actuators, B: Chemical, 257, 295-302. https://doi.org/10.1016/j.snb.2017.10.153