期刊
ACS SENSORS
卷 7, 期 3, 页码 849-855出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.1c02616
关键词
salinity sensing; optoelectronic; monolithic; antifouling; NaCl solution
资金
- HKSAR Research Grants Council (RGC) [14306117, 27202919]
- HKSAR Innovation and Technology Fund (ITF): Platform Projects of the Innovation and Technology Support Programme (ITSP) [ITS/293/19FP]
- HKU [102009812]
- National Natural Science Foundation of China [62004088, 12074170]
- Shenzhen Natural Science Foundation [20200925160044004]
A highly sensitive salinity sensor based on a microscale III-nitride chip was developed, with enhanced long-term stability through a polymer antifouling coating. The sensor exhibits ultra-sensitivity, compactness, cost-effectiveness, fast response time, wireless compatibility, and ease of use, making it highly promising for in situ salinity sensing under varying environmental conditions.
Salinity is an indispensable parameter for variousapplications such as biomedicaldiagnostics, environmentalchemical analysis, marine monitoring, etc. Miniaturized salinitysensors have significant potential in portable applications in variousscenarios and designs with highly desirable features of convenience,reliability, economy, and high sensitivity and also the capability ofreal-time measurements. Herein, we demonstrate a highly refractiveindex-sensitive sensor based on a microscale III-nitride chip thatconsists of a light emitter and a photodetector. This highlymonolithically integrated chip shows an excellent sensitivity ofsalinity of 2606 nA/(mol/L) (or 446 nA/%) and a response timeof 0.243 s. In addition, wireless communication technologies canbe easily integrated with the sensing device, which enables automatic remote control for data collection and postprocessing.Remarkably, a polymer-based antifouling coating on the surface of the sensing chip has been established to significantly improve itslong-term stability in mimicked marine water. The demonstrated ultrasensitive, ultracompact, cost-effective, fast response, wireless-compatible, and easy-to-use features endow the current device with a huge potential for in situ salinity sensing under varyingenvironmental conditions
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