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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/044/0156

    • Keywords

       

      Relative humidity sensor; metalloporphyrin; surface morphology; capacitive–resistive sensing mechanism; response recovery time; dielectric permittivity.

    • Abstract

       

      A quest for a suitable method to fabricate thin films-based humidity sensor with superior sensitivity in their electric response, calls for a selection of an appropriate material and effective fabrication technique. In this paper, organic semiconductor metalloporphyrin (TDTBPPNi) has been utilized to fabricate highly sensitive humidity sensors by using anovel eco-benign microwave-assisted synthetic procedure. Metalloporphyrin (TDTBPPNi) has been later deposited through facile drop-casting technique on the gap (40${\mu}$m) between planar metallic aluminium (Al) electrodes to fabricate surface-type capacitive and resistive type relative humidity sensor (Al/TDTBPPNi/Al). The structural and morphological characterizations of humidity sensing layer have been investigated, which indicate amorphous structure and rough globular surface morphology of the thin film, respectively. The relative humidity sensing capacitive and resistive characteristics of the sensor have been monitored in 39–85% relative humidity (%RH) bandwidth. The fabricated sensor under biasing condition of 1 V of applied bias ($V$$_{rms}$) and 200 Hz AC test frequency, exhibits significantly higher sensitivity of ${\sim}$102.61 pF/%RH and −333.07 kΩ/%RH in capacitive and resistive mode of operation. The average values of response and reset time of resistive sensor have been estimated to be ${\sim}$35 and ${\sim}$57 s, respectively. The reasons for this achieved sensitivity and response level have also been discussed.

    • Author Affiliations

       

      Z FAROOQ1 M YASEEN2 M ZULFQAR3 M H R MAHMOOD2 R AKRAM4 K W QADIR5 6 Q ZAFAR3

      1. Department of Physics, Division of Science and Technology, University of Education, Lahore 54000, Pakistan
      2. Department of Chemistry, Division of Science and Technology, University of Education, Lahore 54000, Pakistan
      3. Department of Physics, University of Management and Technology, Lahore 54000, Pakistan
      4. Electrical Engineering Department, College of Engineering, Qassim University, P.O. Box 6677, Buraydah 51452, Saudi Arabia
      5. Computation Nanotechnology Research Lab (CNRL), Department of Physics, College of Education, Salahaddin University-Erbil, Erbil 44002, Iraq
      6. Physics Education Department, Faculty of Education, Tishk International University, Erbil 44001, Iraq
    • Dates

       
  • Bulletin of Materials Science | News

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      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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