<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>The nanocrystalline powders of pure and Al3+-doped ZnO with hexagonal structure were prepared by a simple hydrothermal decomposition route. The structure and crystal phase of the powders were characterized by X-ray diffraction (XRD) and the microstructure by transmission electron microscopy (TEM). All the compositions exhibited a single phase, suggesting a formation of solid solution between Al2O3 and ZnO. DC electrical properties of the prepared nanoparticles were studied by DC conductivity measurements. The indirect heating structure sensors based on pure and doped ZnO as sensitive materials were fabricated on an alumna tube with Au electrodes. Gas-sensing properties of the sensor elements were measured as a function of concentration of dopant, operating temperature and concentrations of the test gases. The pure ZnO exhibited high response to NH3 gas at an operating temperature of 200 °C. Doping of ZnO with Al3+ increased its response towards NH3 and the Al3+-doped ZnO (3.0 wt% Al2O3) showed the maximum response at 175 °C. The selectivity of the sensor elements for NH3 against different reducing gases like LPG, H2S and H2 was studied. The results on response and recovery time were also discussed.</p></abstract>

The nanocrystalline powders of pure and Al3+-doped ZnO with hexagonal structure were prepared by a simple hydrothermal decomposition route. The structure and crystal phase of the powders were characterized by X-ray diffraction (XRD) and the microstructure by transmission electron microscopy (TEM). All the compositions exhibited a single phase, suggesting a formation of solid solution between Al2O3 and ZnO. DC electrical properties of the prepared nanoparticles were studied by DC conductivity measurements. The indirect heating structure sensors based on pure and doped ZnO as sensitive materials were fabricated on an alumna tube with Au electrodes. Gas-sensing properties of the sensor elements were measured as a function of concentration of dopant, operating temperature and concentrations of the test gases. The pure ZnO exhibited high response to NH3 gas at an operating temperature of 200 °C. Doping of ZnO with Al3+ increased its response towards NH3 and the Al3+-doped ZnO (3.0 wt% Al2O3) showed the maximum response at 175 °C. The selectivity of the sensor elements for NH3 against different reducing gases like LPG, H2S and H2 was studied. The results on response and recovery time were also discussed.

Gas sensing performance of nanocrystalline ZnO prepared by a simple route

Department of Physics, R.D.I.K.and K.D. College, Badnera, 444701, Maharastra, India

Department of Physics, Government Vidarbha Institute of Science & Humanities, Amravati, 444604, Maharastra, India

Nano Technology Research Laboratory, Department of Chemistry, Shri Shivaji Science College, Amravati, 444602, Maharastra, India

Department of Physics, Arts, Science and Commerce College, Chikhaldara, 444807, Maharastra, India

Department of Physics, Arts, Commerce and Science College, Amravati, 444606, Maharastra, India

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Gas sensing performance of nanocrystalline ZnO prepared by a simple route"}

The nanocrystalline powders of pure and Al3+-doped ZnO with hexagonal structure were prepared by a simple hydrothermal decomposition route. The structure and...

Gas sensing performance of nanocrystalline ZnO prepared by a simple route

Published Online: Aug 29, 2013

Page range: 298 - 305

DOI: https://doi.org/10.2478/s13536-013-0104-x

Keywords
nanocrystalline zinc oxide, H2S, gas sensor, selectivity, recovery time

© 2013 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Gas sensing performance of nanocrystalline ZnO prepared by a simple route

Published Online: Aug 29, 2013

Page range: 298 - 305

DOI: https://doi.org/10.2478/s13536-013-0104-x

Keywordsnanocrystalline zinc oxide, H2S, gas sensor, selectivity, recovery time

© 2013 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
nanocrystalline zinc oxide, H2S, gas sensor, selectivity, recovery time