Synthesis of CdS nanoparticle by sol-gel method as low temperature NO2 sensor

Abstract

In the present work, NO2 gas sensor based on Cadmium sulfide (CdS) nanostructures were prepared by using the chemical route technique. CdS thin films of different thickness were prepared by spin coating technique with different speed (1000, 2000 and 3000 rpm). Prepared thin films were characterized by techniques, such as X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared spectroscopy (FT-IR) and Ultraviolet–Visible spectroscopy (UV–Vis), which offered the information about the chemical structure and morphology of CdS thin film. Gas sensing measurements for detecting 20 ppm NO2 gas were carried out on CdS thin film prepared on interdigital electrodes patterned corning glass substrate and a maximum response of ~1.73 × 102 at 70 °C operating temperature was observed.