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. 2019 May 31;7:395. doi: 10.3389/fchem.2019.00395

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Copyright © 2019 Xin, Wu, Zou, Wang, Jiang, Xing, Yang and Guo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Experimental setup schematic of rGO-based microfluidic sensor. a, laser; b, attenuator; c, polarizer; d, 1/4 wave plate; e, reflecting mirror; f, rGO-glass-based microfluidic chip device; g, aperture; h, Wollaston prism; i, balanced detector; j, computer; k, ball valve. (B) The direct detection of a weak RI change of water solution generated by an ultrasonic wave. (C) The optimized RI change detection of water. (D) The relationship between voltage signals and the liquid level. (E) The detected RI change as a function of water pressure in the detection window, which is caused by liquid level difference.