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CO Sensor based on Thin Film of ZnO Nanoparticles

Published online by Cambridge University Press:  04 September 2017

Carlos Aquino López*
Affiliation:
Division of Graduate Studies and Research, Instituto Tecnológico de Toluca, TecNM-SEP, Avenida Tecnológico, s/n, Colonia Agrícola Buenavista, Metepec, 52149, México.
Guillermo Carbajal-Franco
Affiliation:
Division of Graduate Studies and Research, Instituto Tecnológico de Toluca, TecNM-SEP, Avenida Tecnológico, s/n, Colonia Agrícola Buenavista, Metepec, 52149, México.
Fernanda Márquez Quintana
Affiliation:
Division of Graduate Studies and Research, Instituto Tecnológico de Toluca, TecNM-SEP, Avenida Tecnológico, s/n, Colonia Agrícola Buenavista, Metepec, 52149, México.
Alejandro Ávila Garcia
Affiliation:
Departamento de Ingeniería Eléctrica, Sección de Electrónica del Estado Sólido, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Av. Instituto Politécnico Nacional, No. 2508, Cd. de México, 07360, Mexico.
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Abstract

In this research, zinc chloride has been used as precursor and zinc oxide nanostructures have been synthesized by Sol-Gel process, using deionized water and 2-propanol as solvents in order to evaluate their influence on the final materials and their properties. Thin films of synthesized samples were deposited on glass substrates by the dipping method. The structure and morphology of crystals were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. The electrical response of the samples to CO was investigated at different operating temperatures and sensitivity curves are presented for samples synthesized in water and 2-propanol (IsOH) solvents. The SEM analysis revealed that ZnO thin films have yielded to different morphologies depending on the solvent, and material was found on the non-immersed side of the substrate attributable to migration during the dip-coating process. XRD analysis shows that the samples present the ZnO wurtzite structure. In EDS analysis it was found the presence of chlorine on the sample, opening the possibility the presence of zinc oxychloride.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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