Fast Response Facile Fabricated IDE-Based Ultra-sensitive Humidity Sensor for Medical Applications

Asad Ullah, Muhammad Hamza Zulfiqar, Muhammad Atif Khan, Muhammad Zubair*, Muhammad Qasim Mehmood*, Yehia Massoud*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


An eco-friendly, biodegradable, flexible, and facile fabricated interdigital electrode-based capacitive humidity sensor with applications in health and medicine has been reported here. Several sensors use copper tape as electrodes on the polyethylene terephthalate (PET) substrate, with non-woven paper as the sensing layer. Two different configurations of sensors were tested, i.e., with and without pores in the PET substrate. The sensing performance of both sensors has been tested for relative humidity ranging from 35 to 100% at temperatures ranging from 20 to 50 °C. The capacitance of the sensor varies linearly in response to the change in humidity. The sensor with pores shows a response from 28 to 630 pF as the humidity varied from 35 to 100%, whereas the sensor without pores responded from 22 to 430 pF. The response and recovery times of the fabricated sensor are observed as ∼2.4, and ∼1.8 s, respectively, and the sensitivity is 9.67 pF/% RH. The sensors are tested multiple times, and repeatable results are achieved each time with an accuracy of ±0.22%. Further, the sensor’s response is also stable for different ranges of temperatures. Finally, to demonstrate an application of the proposed sensor, it has been utilized to monitor respiration through nose and mouth breathing. The low-cost, stable, repeatable, and highly sensitive response makes our fabricated sensor a promising candidate for practical field applications.

Original languageEnglish (US)
Pages (from-to)16842-16850
Number of pages9
Issue number19
StatePublished - May 16 2023

Bibliographical note

Funding Information:
The authors would like to acknowledge research funding for the Innovative Technologies Laboratories (ITL) from the King Abdullah University of Science and Technology (KAUST).

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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