Au decoration of vertical hematite nanotube arrays for further selective detection of acetone in exhaled breath

Do Hong Kim, Tae Hoon Kim, Woonbae Sohn, Jun Min Suh, Young Seok Shim, Ki Chang Kwon, Kootak Hong, Seokhoon Choi, Hyung Gi Byun, Jong Heun Lee, Ho Won Jang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Vertically ordered hematite nanotubes decorated with Au nanoparticles are synthesized by a facile electrochemical anodization method and self-agglomeration of Au films. Au decoration significantly enhances the response of hematite nanotubes to acetone at 350 °C and the response to acetone is 2.4 times higher than the response to ethanol, the counterpart target gas. The Au nanoparticles decorated hematite nanotubes exhibit unprecedentedly high and selective responses to acetone at 350 °C with 50% relative humidity condition (calibrated at room temperature, 25 °C). The enhanced gas sensing properties in a humid condition were attributed to the spillover effect by Au nanoparticles and high porosity of hematite nanotubes with a large surface-to-volume ratio. These results indicate that Au nanoparticles decorated hematite nanotubes are promising for use in high quality sensor materials for breath analyzers to diagnose diabetes mellitus.

Original languageEnglish
Pages (from-to)587-594
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume274
DOIs
Publication statusPublished - 2018 Nov 20

Keywords

  • Acetone sensor
  • Anodization
  • Au catalyst
  • Diabetes mellitus
  • Hematite nanotubes

ASJC Scopus subject areas

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

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  • Cite this

    Kim, D. H., Kim, T. H., Sohn, W., Suh, J. M., Shim, Y. S., Kwon, K. C., Hong, K., Choi, S., Byun, H. G., Lee, J. H., & Jang, H. W. (2018). Au decoration of vertical hematite nanotube arrays for further selective detection of acetone in exhaled breath. Sensors and Actuators, B: Chemical, 274, 587-594. https://doi.org/10.1016/j.snb.2018.07.159