Flexible Graphite/PPG Hybrid Composite-Based Resistive Sensor for Sensing Organic Compounds.

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Volatile organic compounds (VOCs) pose environmental and health risks.
• Developing sensitive and stable chemical sensors is crucial for detection.
• Existing sensors often face limitations in cost, scalability, or performance.

Purpose of the Study:

• To investigate a novel sensor for volatile organic compounds (VOCs).
• To utilize a graphite (G)/polypropylene glycol (PPG) hybrid composite (HC) for sensing applications.
• To explore the potential of cost-effective and scalable materials for chemical sensors.

Main Methods:

• Fabrication of G/PPG HC sensor films on polyethylene terephthalate (PET) using a blade-coating method.
• Characterization of sensing paste dispersibility and stability.
• Evaluation of sensor response to various organic compounds, including hydrocarbons like benzene and toluene.

Main Results:

• Successfully fabricated G/PPG HC sensor films with good dispersibility and stability.
• Observed varying thickness changes in sensor films due to the polymer swelling effect, correlated with G/PPG ratio.
• Demonstrated significant resistance changes in response to organic compounds, attributed to graphite disconnection within the swollen PPG matrix.
• Achieved sensitive detection of hydrocarbon materials without moisture-induced malfunctions.

Conclusions:

• The G/PPG HC composite offers a promising platform for developing superior chemical sensors.
• The sensor exhibits enhanced sensitivity, selectivity, and stability for VOC detection.
• This approach provides a cost-effective and easily scalable method for advanced chemical sensor applications.