Abstracts Book - IMRC 2018

• SA6-P049
SYNTHESIS AND CHARACTERIZATION OF ZNO MICRO-AND
NANOSTRUCTURES FOR GAS SENSOR APPLICATION
Jorge Rodrigo Mora Viquez 1
1 Benemerita Universidad Autonoma de Puebla, ICUAP, Mexico.
The gas sensors most used are based in semiconductor oxides, whose electrical
conductivity is greatly changed due to the reaction between the surface of
semiconductor and gas present in the atmosphere. ZnO is a semiconductor that
has more technological interest as active material in gas sensors, due to it is
excellent chemical and thermal stability. Moreover, ZnO has a good
characteristic like chemical sensitivity to different adsorbed gases, amenability
to doping, nontoxicity, and low cost. In this work, ZnO layers were grown by
means of vapor-solid technique, the samples were made ZnS commercial
powder (99.999% purity) as substrate and precursor. The starting powder (ZnS)
is compacted in tablet form with dimension of 8 mm diameter and 2mm
thickness. Once done it, the tablet was exposed to different to treatment
temperatures (800-1000°C), as well as to different treatment times in a constant
nitrogen atmosphere. The morphological, structural, optical and electrical
properties of the samples were investigated by X-ray diffraction (XRD), Scanning
Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS),
Photoluminescence (PL), and electrical conductivity. Finally, ZnO layers sensing
properties were measured by means of monitoring the electrical resistivity in
the presence of parts per million of CO to different operating temperature
respectively.
Keywords: ZnO, Nanostructures, Vapor-solid
Presenting authors email: odiamemas_jrmv@hotmail.com