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In this work, a resistive-type relative humidity sensor using polyvinyl pyrrolidone/multiwalled carbon nanotube (PVP-MWCNT) composite film is reported. The electrical characteristics of the paper-based flexible devices with Cu/MWCNT/PVP structures have been studied. The microscopic analysis of the hybrid nanocomposites is done using field emission scanning electron microscopy. Diameter of the MWCNT is found to be 20–80 nm, whereas the length is determined to be 100–800 nm. Raman spectra at around 1347.73, 1584.03 and 2695.68 cm−1 signify D, G and 2D peaks of MWCNTs, respectively. The humidity sensing behaviour has been studied for this sensor by resistance measurements in the relative humidity (RH) ranging from 36% up to 96% at room temperature. The fabricated sensor exhibits reasonably good linearity having a positive slope throughout the operating RH window. The sensor shows humidity sensitivity of about 32.5 Ω/%RH. A humidity sensing mechanism for the PVP/MWCNT composite film is explained considering the adsorption of water molecules on MWCNTs along with proton transfer.

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Polyvinyl Pyrrolidone Assisted Multiwalled Carbon Nanotube Ink for Paper-Based Humidity Sensor

  • 会议论文

  • 发表日期：

    2025年

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  • Rajib Mahato,
  • Akanksha Chauhan,
  • Sk. Masiul Islam,
  • Sumitra Singh

摘要

In this work, a resistive-type relative humidity sensor using polyvinyl pyrrolidone/multiwalled carbon nanotube (PVP-MWCNT) composite film is reported. The electrical characteristics of the paper-based flexible devices with Cu/MWCNT/PVP structures have been studied. The microscopic analysis of the hybrid nanocomposites is done using field emission scanning electron microscopy. Diameter of the MWCNT is found to be 20–80 nm, whereas the length is determined to be 100–800 nm. Raman spectra at around 1347.73, 1584.03 and 2695.68 cm−1 signify D, G and 2D peaks of MWCNTs, respectively. The humidity sensing behaviour has been studied for this sensor by resistance measurements in the relative humidity (RH) ranging from 36% up to 96% at room temperature. The fabricated sensor exhibits reasonably good linearity having a positive slope throughout the operating RH window. The sensor shows humidity sensitivity of about 32.5 Ω/%RH. A humidity sensing mechanism for the PVP/MWCNT composite film is explained considering the adsorption of water molecules on MWCNTs along with proton transfer.