Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 2, Pages 928-934Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am201591w
Keywords
Co3O4/ZnO; nanocomposites; plasma enhanced-chemical vapor deposition; gas sensors
Funding
- European Community [ENHANCE-238409]
- Padova University PRAT [CPDA102579]
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Herein, we describe the design, fabrication and gas sensing tests of p-Co3O4/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 Co3O4 nanograins. Structural, morphological and compositional analyses evidenced the successful formation of pure and high-area nanocomposites with a tailored overdispersion of Co3O4 particles on ZnO and an intimate contact between the two oxides. Preliminary functional tests for the detection of flammable/toxic analytes (CH3COCH3, CH3CH2OH, NO2) indicated promising sensing responses and the possibility of discriminating between reducing and oxidizing species as a function of the operating temperature.
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