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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Al-doped ZnO for highly sensitive CO gas sensors
Sensors and Actuators, B: Chemical, Volume 196, Year 2014
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Description
Al-doped ZnO (AZO) nanoparticles have been prepared using a modified sol-gel technique. The as-prepared AZO nanoparticles were annealed at 400 C, and their morphologies and microstructural characteristics were investigated using transmission electron microscopy (TEM) and x-ray powder diffraction (XRD) analyses. Crystallites with an average size of approximately 60-70 nm and ZnO as a primary phase were observed in all samples. In addition, smaller nanoparticles (less than 5 nm) with an Al-rich structure covering the surface of larger ZnO crystallites were also noted on the Al-doped samples. Chemoresistive devices consisting of a thick layer of AZO nanoparticles on interdigitated alumina substrates have been fabricated, and their electrical and sensing characteristics for carbon monoxide were investigated. Al-doping provided a remarkable decrease in the electrical resistance of the sensing layer at the working temperature of the sensors (250-300 C). The sensors based on Al-doped ZnO exhibited a higher response than the pure ZnO sample, allowing the detection of CO at sub-ppm concentrations in air. The enhancement in sensing properties was discussed in terms of the characterization and electrical data. © 2014 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Hjiri, M.
Tunisia, Gabes
Université de Gabès
El-Mir, Lassaad Mabrouk
Tunisia, Gabes
Université de Gabès
Saudi Arabia, Riyadh
Al-imam Muhammad Ibn Saud Islamic University
Leonardi, Salvatore Gianluca
Italy, Messina
Università Degli Studi Di Messina
Pistone, Alessandro
Italy, Messina
Università Degli Studi Di Messina
Mavilia, L.
Italy, Reggio Calabria
Università Degli Studi Di Reggio Calabria
Neri, Giovanni
Italy, Messina
Università Degli Studi Di Messina
Statistics
Citations: 314
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1016/j.snb.2014.01.068
ISSN:
09254005
Research Areas
Environmental