Cellulose/TiO₂ Humidity Sensor.

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.