An Ultrasensitive Laser-Induced Graphene Electrode-Based Triboelectric Sensor Utilizing Trapped Air as Effective...

Area of Science:

• Triboelectric nanogenerators
• Dielectric materials
• Sensor technology

Background:

• Air is a common dielectric material.
• Triboelectric sensors utilize contact electrification for energy harvesting and sensing.
• Thin-film sensors offer advantages in sensitivity and portability.

Purpose of the Study:

• To develop an ultra-sensitive triboelectric sensor for low-pressure detection.
• To investigate the role of trapped air in enhancing sensor performance.
• To explore the potential of laser-induced graphene (LIG) electrodes in thin-film sensors.

Main Methods:

• Fabrication of an air-trapped padded sensor (ATPS) using silicone rubber (SR) and polyimide (PI) films.
• Integration of laser-induced graphene (LIG) as electrode material on PI.
• Characterization of the sensor's electrical output (voltage, current, power density) under pressure stimuli.
• Comparative analysis with a control device lacking trapped air.

Main Results:

• The developed ATPS achieved an output voltage of ~32 V and a short-circuit current of 1.2 µA.
• A maximum power density of 139.8 mW m^-2 was attained.
• The presence of trapped air significantly enhanced electrical output compared to a device with air passage.
• The thin device (1 mm thickness, 0.6 mm gap) exhibited high sensitivity to low-amplitude pressures.

Conclusions:

• The air-trapped padded sensor (ATPS) demonstrates superior performance due to the crucial role of trapped air.
• Laser-induced graphene (LIG) facilitates the fabrication of thin, highly sensitive triboelectric sensors.
• The ATPS is a promising candidate for ultra-sensitive healthcare sensing applications.