Au-decorated WO3 cross-linked nanodomes for ultrahigh sensitive and selective sensing of NO2 and C2H5OH

Young Seok Shim, Hi Gyu Moon, Do Hong Kim, Lihua Zhang, Young Soo Yoon, Seok Jin Yoon, Chong-Yun Kang, Ho Won Jang

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Abstract

Au-decorated WO3 cross-linked nanodomes are fabricated using soft templates composed of highly ordered polystyrene beads and self-agglomeration of Au. The distribution and size of Au nanoparticles on the surface of WO3 cross-linked nanodomes are controlled by varying the thickness of the initial Au film. The responses of Au-decorated WO3 cross-linked nanodomes to various gases such as NO2, CH 3COCH3, C2H5OH, NH3, CO, H2, and C6H6 are at least 5 times higher than those of bare WO3 cross-linked nanodomes. The response enhancement by Au decoration is dependent on the target gas, which is attributed to an interplay between electronic and chemical sensitizations. In particular, the Au-decorated WO3 cross-linked nanodomes exhibit extremely high sensitivities and selectivities, and ppt-level detection limits to NO 2 and C2H5OH at 250°C and 450°C, respectively. These results suggest that Au-decorated WO3 cross-linked nanodomes are very promising for use in breath analysers to diagnose both asthma and lung cancer from exhaled human breath.

Original languageEnglish
Pages (from-to)10452-10459
Number of pages8
JournalRSC Advances
Volume3
Issue number26
DOIs
Publication statusPublished - 2013 Aug 19

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Shim, Y. S., Moon, H. G., Kim, D. H., Zhang, L., Yoon, Y. S., Yoon, S. J., Kang, C-Y., & Jang, H. W. (2013). Au-decorated WO3 cross-linked nanodomes for ultrahigh sensitive and selective sensing of NO2 and C2H5OH. RSC Advances, 3(26), 10452-10459. https://doi.org/10.1039/c3ra41331d