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Effect of solution pH and adsorbent concentration on the sensing parameters of TGN-based electrochemical sensor

机译：溶液pH和吸附剂浓度对基于TGN的电化学传感器传感参数的影响

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摘要

The response of trilayer graphene nanoribbon (TGN)-based ion-sensitive field-effect transistor (ISFET) to different pH solutions and adsorption effect on the sensing parameters are analytically studied in this research. The authors propose a TGN-based sensor to electrochemically detect pH. To this end, absorption effect on the sensing area in the form of carrier concentration, carrier velocity, and conductance variations are investigated. Also, the caused electrical response on TGN as a detection element is analytically proposed, in which significant current decrease of the sensor is observed after exposure to high pH values. In order to verify the accuracy of the model, it is compared with recent reports on pH sensors. The TGN-based pH sensor exposes higher current compared to that of carbon nanotube (CNT) counterpart for analogous ambient conditions. While, the comparative results demonstrate that the conductance of proposed model is lower than that of monolayer graphene-counterpart for equivalent pH values. The results confirm that the conductance of the sensor is decreased and Vg-min is obviously right-shifted by increasing value of pH. The authors demonstrate that although there is not the experimental evidence reported in the part of literature for TGN sensor, but the model can assist in comprehending experiments involving nanoscale pH sensors.
机译：研究了基于三层石墨烯纳米带（TGN）的离子敏感场效应晶体管（ISFET）对不同pH溶液的响应以及对传感参数的吸附效应。作者提出了一种基于TGN的传感器来电化学检测pH。为此，研究了以载流子浓度，载流子速度和电导率变化形式对传感区域的吸收效应。此外，分析性地提出了在作为检测元件的TGN上引起的电响应，其中在暴露于高pH值后观察到传感器的电流显着下降。为了验证模型的准确性，将其与有关pH传感器的最新报告进行了比较。在类似的环境条件下，与碳纳米管（CNT）相比，基于TGN的pH传感器暴露的电流更高。同时，比较结果表明，在相同的pH值下，该模型的电导率低于单层石墨烯的电导率。结果证实，通过增加pH值，传感器的电导率降低并且Vg-min明显右移。作者证明，尽管文献中没有有关TGN传感器的实验证据，但是该模型可以帮助理解涉及纳米pH传感器的实验。

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