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Updated: May 21, 2025

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Cellulose/TiO2 Humidity Sensor.

Susana Devesa1, Zohra Benzarti1,2, Madalena Costa3

  • 1Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Advanced Production and Intelligent Systems (ARISE), Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal.

Sensors (Basel, Switzerland)
|March 17, 2025
PubMed
Summary
This summary is machine-generated.

This study developed a cellulose/titanium dioxide composite humidity sensor from potato peels, offering improved sensitivity and reduced electronic waste. This sustainable approach enhances cellulose-based sensor performance for environmental monitoring applications.

Keywords:
TiO2 nanoparticlescellulosehumidity sensorimpedance spectroscopy

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Environmental Science

Background:

  • Resistivity-type humidity sensors are crucial for various applications but contribute to electronic waste.
  • Cellulose, a biodegradable polymer, offers eco-friendly advantages but lacks sufficient sensitivity in humidity sensors.
  • Composite materials are a promising strategy to enhance cellulose-based sensor performance.

Purpose of the Study:

  • To develop a sustainable cellulose/titanium dioxide (TiO2) composite humidity sensor.
  • To improve the sensitivity of cellulose-based humidity sensors.
  • To utilize cellulose extracted from potato peels for e-waste reduction.

Main Methods:

  • Extraction of cellulose from potato peels.
  • Incorporation of titanium dioxide (TiO2) nanoparticles into cellulose.
  • Fabrication of a composite film using the casting method.
  • Evaluation of sensor performance via complex impedance measurements across a frequency range (2 kHz–10 MHz) at varying relative humidity (RH).

Main Results:

  • The cellulose/TiO2 composite exhibited significantly enhanced humidity sensing sensitivity compared to pure cellulose sensors.
  • The composite material demonstrated improved water molecule adsorption capabilities.
  • The sensor's performance was successfully correlated with changes in relative humidity.

Conclusions:

  • The developed cellulose/TiO2 composite offers a sustainable and high-performance solution for humidity sensing.
  • Utilizing waste materials like potato peels contributes to reducing electronic waste.
  • This composite material holds potential for advanced environmental monitoring applications.