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Chip-Scale In Situ Salinity Sensing Based on a Monolithic Optoelectronic Chip.
Jixiang Jing1, Yong Hou1, Yumeng Luo2
1Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China.
ACS Sensors
|March 1, 2022
Summary
We developed a miniaturized salinity sensor using a microscale III-nitride chip for real-time measurements. This highly sensitive and fast-responding device offers potential for portable environmental and biomedical applications.
Area of Science:
- Materials Science
- Sensor Technology
- Environmental Science
Background:
- Salinity measurement is crucial for diverse fields including biomedical diagnostics, environmental analysis, and marine monitoring.
- Miniaturized sensors offer portability, convenience, reliability, cost-effectiveness, and real-time data acquisition capabilities.
Purpose of the Study:
- To demonstrate a highly refractive index-sensitive salinity sensor.
- To develop a compact, integrated sensing chip for in situ salinity monitoring.
Main Methods:
- Fabrication of a microscale III-nitride chip integrating a light emitter and photodetector.
- Application of a polymer-based antifouling coating for enhanced stability.
- Integration with wireless communication for remote data collection.
Main Results:
- Achieved high sensitivity of 2606 nA/(mol/L) or 446 nA/% for salinity.
- Demonstrated a rapid response time of 0.243 seconds.
- Confirmed improved long-term stability in mimicked marine water due to the antifouling coating.
Conclusions:
- The developed sensor is ultrasensitive, ultracompact, cost-effective, and fast-responding.
- Wireless compatibility and antifouling properties enhance its suitability for in situ monitoring.
- The device shows significant potential for diverse salinity sensing applications under varying conditions.
