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Synthesis, Characterization and Sensing Properties of AZO and IZO Nanomaterials

Laboratory of Physics of Materials and Nanomaterials Applied at Environment, Faculty of Sciences of Gabes, 6072 Gabes, Tunisia
Al Imam Mohammad Ibn Saud Islamic University (IMSIU), College of Sciences, Department of Physics, Riyadh 11623, Saudi Arabia
Department of Electronic Engineering, Chemistry and Materials Engineering, University of Messina, 98166 Messina, Italy
Author to whom correspondence should be addressed.
Chemosensors 2014, 2(2), 121-130;
Received: 24 December 2013 / Revised: 9 April 2014 / Accepted: 13 May 2014 / Published: 23 May 2014
(This article belongs to the Special Issue Solid State Gas Sensors)
PDF [452 KB, uploaded 23 May 2014]


Al-doped ZnO (AZO) and In-doped ZnO (IZO) nanopowders were prepared by a sol-gel route and subsequent drying in ethanol under supercritical conditions. The morphological and microstructural properties were investigated by transmission electron microscopy (TEM) analysis and X-ray powder diffraction (XRD). The characterization study showed that the AZO and IZO nanoparticles were crystalline and exhibited the hexagonal wurtzite structure. Chemoresistive devices consisting of a thick layer of synthesized nanoparticles on interdigitated alumina substrates have been fabricated and their electrical and sensing characteristics were investigated. The sensor performances of the AZO and IZO nanoparticles for carbon monoxide (CO) were reported. The results indicated that both doped-sensors exhibited higher response and quick response/recovery dynamics compared to a ZnO-based sensor. These interesting sensing properties were discussed on the basis of the characterization data reported. View Full-Text
Keywords: In-doped ZnO; Al-doped ZnO; nanoparticles; sol-gel; gas sensor; CO In-doped ZnO; Al-doped ZnO; nanoparticles; sol-gel; gas sensor; CO

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Hjiri, M.; Mir, L.E.; Leonardi, S.G. Synthesis, Characterization and Sensing Properties of AZO and IZO Nanomaterials. Chemosensors 2014, 2, 121-130.

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