P2.4.20 Plasma-assisted Synthesis of p-Co3O4/n-ZnO Nanocomposites for Gas Sensors

14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
P2.4 Nanostructured Sensors
D. Bekermann, A. Gasparotto, C. Maccato - Department of Chemistry, Padova University and INSTM (Italy), D. Barreca - CNR-ISTM and INSTM, Department of Chemistry, Padova University (Italy), E. Comini, G. Sberveglieri - CNR-IDASC, SENSOR Lab, Department of Chemistry and Physics (Italy), C. Sada - Department of Physics and CNISM, Padova University (Italy), A. Devi, R. Fischer - Lehrstuhl für Anorganische Chemie II, Ruhr-University Bochum (Germany)
1559 - 1562


The present contribution is focused on the design and characterization of p-Co3O4/n-ZnO nanocomposites as gas sensors for the detection of flammable/toxic analytes. A two-step Plasma Assisted-Chemical Vapor Deposition (PACVD) process was used to develop the target systems. The synthetic approach consisted in the initial deposition of c-axis oriented ZnO on polycrystalline alumina substrates, followed by the over-dispersion of tailored Co3O4 amounts. A multi-technique analysis, involving Glancing Incidence X-ray Diffraction (GIXRD), Field Emission-Secondary Electron Microscopy (FE-SEM), and X-ray Photoelectron Spectroscopy (XPS), evidenced the successful deposition of Co3O4 particles on the ZnO matrix and the absence of Co-Zn-O ternary phases. The obtained composite materials displayed attractive properties as gas sensors for acetone, ethanol and nitrogen dioxide.