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A Quasi Solid-State Hydrogel/InGaN Nanorod Heterostructure-Enabled Amphibious Sensor for Stable and Cross-Medium
Wei Chen1, Yang Li1, Tianle Zhang2
1iGaN Laboratory, School of Microelectronics, University of Science and Technology of China, Hefei 230000, P. R. China.
ACS Nano
|July 14, 2025
Summary
Researchers developed a novel amphibious photosensor using a hydrogel/InGaN nanorod heterostructure. This wearable device offers sensitive, self-powered ultraviolet detection in both terrestrial and aquatic environments for advanced health monitoring.
Area of Science:
- Optoelectronics
- Materials Science
- Biomedical Engineering
Background:
- Wearable optoelectronic systems are crucial for health monitoring.
- Existing photosensors struggle with cross-medium (terrestrial/aquatic) operation and sensitivity.
Purpose of the Study:
- To develop a self-powered, amphibious photosensor for versatile environmental monitoring.
- To mimic biophotosensory behavior for integrated human monitoring.
Main Methods:
- Fabrication of a hydrogel/Indium Gallium Nitride (InGaN) nanorod heterostructure.
- Utilizing a quasi solid-state hydrogel for ion conductivity and cross-medium response.
- Tailoring InGaN bandgap and employing carbon-layer passivation for enhanced UV detection.
Main Results:
- Achieved consistent photoresponse in both terrestrial and submerged conditions.
- Demonstrated high-selectivity harmful UV (280-420 nm) detection under sunlight.
- Obtained high ultraviolet responsivity (130.7 mA/W) with a fast response time (<10 ms).
Conclusions:
- The developed amphibious photosensor provides a stable and practical platform for multifunctional optoelectronic systems.
- Enables real-time UV intensity monitoring in diverse waterfront environments.
- Advances the development of wearable amphibious-type photosensors for complex monitoring applications.
