Grain-Size-Tuned Highly H2-Selective Chemiresistive Sensors Based on ZnO-SnO2 Composite Nanofibers

Akash Katoch, Zain Ul Abideen, Hyoun Woo Kim, Sang Sub Kim

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

We investigated the effect of grain size on the H2-sensing behavior of SnO2-ZnO composite nanofibers. The 0.9SnO2-0.1ZnO composite nanofibers were calcined at 700 °C for various times to control the size of nanograins. A bifunctional sensing mechanism, which is related not only to the SnO2-SnO2 nanograins, but also to the ZnO-SnO2 nanograins with surface metallization effect, is responsible for the grain-oriented H2-sensing properties and the selective improvement in sensing behavior to H2 gas compared to other gases. Smaller grains are much more favorable for superior H2 sensing in SnO2-ZnO composite nanofibers, which will be an important guideline for their use in H2 sensors. The one-dimensional nanofiber-based structures in the present study will be efficient in maximizing the sensing capabilities by providing a larger amount of junctions.

Original languageEnglish
Pages (from-to)2486-2494
Number of pages9
JournalACS applied materials & interfaces
Volume8
Issue number4
DOIs
StatePublished - 3 Feb 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

  • hydrogen
  • nanofibers
  • oxide
  • sensors
  • SnO
  • ZnO

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