期刊
MICROMACHINES
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/mi12030281
关键词
optofluidics; dissolved oxygen; phosphorescence quenching; smartphone
类别
资金
- National Natural Science Foundation of China [11774274]
- National Key RAMP
- D Program of China [2018YFC1003200]
- Foundation Research Fund of Shenzhen Science and Technology Program [JCYJ20170818112939064]
- Open Financial Grant from Qingdao National Laboratory for Marine Science and Technology [QNLM2016ORP0410]
The intelligent dissolved oxygen sensor presented in this study is based on phosphorescence quenching, with a high sensitivity oxygen-sensing membrane prepared on microfluidic channels. It offers continuous, intelligent, and real-time analysis of dissolved oxygen, achieving low detection limit, high sensitivity, and short response time. By combining optofluidics and electronics, the sensor provides a miniaturized and intelligent detection platform for practical oxygen analysis in various fields.
Continuous measurement of dissolved oxygen (DO) is essential for water quality monitoring and biomedical applications. Here, a phosphorescence quenching-based intelligent dissolved oxygen sensor on an optofluidic platform for continuous measurement of dissolved oxygen is presented. A high sensitivity dissolved oxygen-sensing membrane was prepared by coating the phosphorescence indicator of platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) on the surface of the microfluidic channels composed of polydimethylsiloxane (PDMS) microstructure arrays. Then, oxygen could be determined by its quenching effect on the phosphorescence, according to Stern-Volmer model. The intelligent sensor abandons complicated optical or electrical design and uses a photomultiplier (PMT) counter in cooperation with a mobile phone application program to measure phosphorescence intensity, so as to realize continuous, intelligent and real-time dissolved oxygen analysis. Owing to the combination of the microfluidic-based highly sensitive oxygen sensing membrane with a reliable phosphorescent intensity detection module, the intelligent sensor achieves a low limit of detection (LOD) of 0.01 mg/L, a high sensitivity of 16.9 and a short response time (22 s). Different natural water samples were successfully analyzed using the intelligent sensor, and results demonstrated that the sensor features a high accuracy. The sensor combines the oxygen sensing mechanism with optofluidics and electronics, providing a miniaturized and intelligent detection platform for practical oxygen analysis in different application fields.
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