Cadmium sulfide doped with silver as CO2 gas sensor using pyrolysis technique

Abstract

<p>The monitoring of CO2 in our life safety, industrial, and chemical laboratory<br />applications make it an inspiring task. The chemical spray pyrolysis technique<br />was used to prepare CdS/Ag thin films. The nanocrystalline cadmium sulfide<br />thin films were doped with Silver at different doping concentrations (0%, 2%,<br />and 4%). The morphologies, structures, and gas sensing properties of CdS/Ag<br />films are presented. The samples were characterized using X-ray diffraction<br />(XRD) and atomic force microscope (AFM). The XRD results show that the<br />films are a polycrystalline composition and hexagonal type with a favoured<br />orientation along (111) direction. The average grain size (nm) of AFM is<br />between 75 and 55 nm. As a result, Ag doping changes the sensitivity of the<br />samples respectively with the percentage of doping with time. The synthesis<br />samples show controlling sensitivity and the small response of sensitivity are<br />the key point in this study.</p>