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Focusing surface acoustic waves assisted electrochemical detector in microfluidics |
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| Authors: | Tengfei Zheng Yue Liu Chaoping Xu Haiwei Lu Chaohui Wang |
| Affiliation: | 1. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, P. R. China Shaanxi Key Lab of Intelligent Robots, Xi'an Jiaotong University, Xi'an, P. R. China;2. State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, P. R. China |
| Abstract: | This article demonstrates a novel electrochemical detection device. The device is composed by two focusing interdigital transducers for exciting focused surface acoustic waves by applying an AC signal, a three-electrode system for electrochemical measurement, and a liquid pool for holding liquid on a LiNbO3 wafer. The amperometry current of ferrocenecarboxylic acid and potassium phosphate buffer solution is used to characterize the detection sensitivity. Two experiments are carried out to optimize the device design. The result shows that the two focusing interdigital transducers with arc degree 30° and distance 5 mm can remarkably enhance the liquid mixing rate. Under this condition, the oxidation current is about 27 times larger than that without surface acoustic wave stirring. |
| Keywords: | acoustic streaming focusing surface acoustic waves three-electrode system |