Morphological Evolution Induced through a Heterojunction of W-Decorated NiO Nanoigloos: Synergistic Effect on High-Performance Gas Sensors

Seung Yeop Yi, Young Geun Song, Jae Yeol Park, Jun Min Suh, Gwang Su Kim, Young Seok Shim, Jong Min Yuk, Sangtae Kim, Ho Won Jang, Byeong Kwon Ju, Chong-Yun Kang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Morphological evolution accompanying a surface roughening and preferred orientation is an effective way to realize a high-performance gas sensor because of its significant potential as a chemical catalyst through chemical potentials and atomic energy states. In this work, we investigated a heterojunction of double-side-W-decorated NiO nanoigloos fabricated through radio frequency sputtering and a softlate method. Interestingly, a morphological evolution characterized by a pyramidal rough surface and the preferred orientation of the (111) plane was observed upon decorating the bare NiO nanoigloos with W. The underlying mechanism of the morphological evolution was precisely demonstrated based on the van der Drift competitive growth model originating from the oxygen transport and chemical strain in the lattice. The gas sensing properties of W-decorated NiO show an excellent NO 2 response and selectivity when compared to other gases. In addition, high response stability was evaluated under interference gas and humidity conditions. The synergistic effects on the sensing performance were interpreted on the basis of the morphological evolution of W-decorated NiO nanoigloos.

Original languageEnglish
Pages (from-to)7529-7538
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number7
DOIs
Publication statusPublished - 2019 Feb 20

Keywords

  • gas sensor
  • heterojunction
  • morphological evolution
  • nanostructure
  • NO

ASJC Scopus subject areas

  • Materials Science(all)

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    Yi, S. Y., Song, Y. G., Park, J. Y., Suh, J. M., Kim, G. S., Shim, Y. S., Yuk, J. M., Kim, S., Jang, H. W., Ju, B. K., & Kang, C-Y. (2019). Morphological Evolution Induced through a Heterojunction of W-Decorated NiO Nanoigloos: Synergistic Effect on High-Performance Gas Sensors. ACS Applied Materials and Interfaces, 11(7), 7529-7538. https://doi.org/10.1021/acsami.8b18678