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      https://www.ias.ac.in/article/fulltext/boms/040/02/0253-0262

    • Keywords

       

      Sensor; humidity; adsorption; hysteresis; porous.

    • Abstract

       

      This study reports the humidity sensing characteristics of ZnO–WO$_3$ nanocomposite. Pellet samples of 0–5 weight% ZnO in WO$_3$ were sintered from 300 to 600$^{\circ}$C. When exposed to humidity, the resistance of the sensing samples was found to decrease with increase in relative humidity (RH). Five percent ZnO-doped WO$_3$ showed maximum sensitivity of 20.95 M$\Omega$/%RH in 15–95% RH range. Sensor parameters like reproducibility, aging, hysteresis, response and recovery times were also studied. Sensing mechanism is discussed in terms of sintering temperature, composition and crystallite size of the sensing element. It was observed that sensing mechanism is strongly based on annealing temperature and percentage of doping. The sensing samples have also been investigated by X-ray diffraction, scanning electron microscope (SEM) and Raman spectroscopy. The crystalline size of the sample was identified by powder X-Ray Diffraction data. The SEM analysis was used to study the surface morphology. The structure, phase and the degree of crystallinity of the materials were examined by Raman spectroscopy.

    • Author Affiliations

       

      VANDNA SHAKYA1 N K PANDEY1 SUNEET KUMAR MISRA1 AKASH ROY1

      1. Sensors and Materials Research Laboratory, Department of Physics, University of Lucknow, Lucknow 226007, India
    • Dates

       
  • Bulletin of Materials Science | News

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