Xinran Wang, Yang Tian, Yuncong Chen, Yueyi Jiao, Md. Azahar Ali, Le Wei, Liang Dong
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Abstract
This paper reports a low-cost extended-gate field effect transistor based nitrate sensor using a microfluidic channel based Reference Electrode (µcRE). The µcRE is integrated with a MOSFET to increase potential stability for long-term measurement. The sensor also includes a readout circuit to save or remotely transmit data to a smartphone. The µcRE exhibits a 0.5 mV/hour drift rate and the sensor offers a 0.997 R-Squared value to the linear fitting for potentiometric measurement of nitrate in water.
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