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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55 Citations (Scopus)

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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    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