Gas sensing performance of nanocrystalline ZnO prepared by a simple route

• Autorzy: Murade P. A. , Sangawar V. S. , Chaudhari G. N. , Kapse V. D. , Bajpeyee A. U.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

nanocrystalline zinc oxide; H2S; gas sensor; selectivity; recovery time

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2013
• Tom: Vol. 31, No. 3
• Strony: 298--305
• Opis fizyczny: Bibliogr. 32 poz., rys., tab., wykr.

Twórcy

autor

Murade P. A.

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

autor

Sangawar V. S.

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

autor

Chaudhari G. N.

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

autor

Kapse V. D.

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

autor

Bajpeyee A. U.

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

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