Microbial biofilm-based hydrovoltaic pressure sensor with ultrahigh sensitivity for self-powered flexible electronics

Area of Science:

• Materials Science
• Biotechnology
• Sensor Technology

Background:

• Integrating self-powered detection with dynamic and static force sensing is crucial for intelligent systems.
• Existing technologies face challenges in combining these functionalities efficiently.
• Microbial biofilms offer unique properties for bio-integrated electronics.

Purpose of the Study:

• To develop a novel self-powered sensor for detecting both dynamic and static forces.
• To utilize microbial biofilms for creating a hydrovoltaic pressure sensor.
• To enhance the capabilities of intelligent technology systems through advanced sensing.

Main Methods:

• Development of a microbial biofilm-based hydrovoltaic pressure sensor (mBio-HPS) using whole-cell Geobacter sulfurreducens.
• Characterization of sensor sensitivity, response time, and stability under various pressure conditions.
• Experimental validation using a sensor-integrated array for real-time pressure detection.

Main Results:

• The mBio-HPS demonstrated high sensitivity (up to 8968.7 kPa⁻¹ at 1 kPa) in the 0.4-25 kPa range without external power.
• Achieved the fastest reported response time of 112.5 μs for detecting dynamic and static forces.
• Maintained stability over 30,000 s and showed effective real-time detection capabilities.

Conclusions:

• The mBio-HPS successfully integrates self-powered functionality with static and dynamic pressure detection.
• This technology shows significant potential for electronic skin and other self-powered electronic applications.
• The hydrovoltaic pressure sensor concept provides new avenues for high-performance self-powered electronics.