Co 3O 4/ZnO nanocomposites: From plasma synthesis to gas sensing applications

D. Bekermann, A. Gasparotto, D. Barreca, C. Maccato, E. Comini, C. Sada, G. Sberveglieri, A. Devi, R. A. Fischer

Research output: Contribution to journalArticlepeer-review

142 Scopus citations

Abstract

Herein, we describe the design, fabrication and gas sensing tests of p-Co 3O 4/n-ZnO nanocomposites. Specifically, arrays of 〈001〉 oriented ZnO nanoparticles were grown on alumina substrates by plasma enhanced-chemical vapor deposition (PECVD) and used as templates for the subsequent PECVD of Co 3O 4 nanograins. Structural, morphological and compositional analyses evidenced the successful formation of pure and high-area nanocomposites with a tailored overdispersion of Co 3O 4 particles on ZnO and an intimate contact between the two oxides. Preliminary functional tests for the detection of flammable/toxic analytes (CH 3COCH 3, CH 3CH 2OH, NO 2) indicated promising sensing responses and the possibility of discriminating between reducing and oxidizing species as a function of the operating temperature.

Original languageEnglish
Pages (from-to)928-934
Number of pages7
JournalACS Applied Materials and Interfaces
Volume4
Issue number2
DOIs
StatePublished - 22 Feb 2012
Externally publishedYes

Keywords

  • Co O /ZnO
  • gas sensors
  • nanocomposites
  • plasma enhanced-chemical vapor deposition

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