同心电极有机电化学晶体管：选择性肼传感的实例研究
Concentric-electrode organic electrochemical transistors: case study for selective hydrazine sensing
摘要：
我们报告肼敏感有机电化学晶体管（OECTs）的设计包括在同心环形电极。这些OECT的设计工程的动机是在生物电子学等领域使用OECT传感阵列的巨大潜力。在这项工作中，PEDOT：PSS为基础的OECTs已被研究为水的传感器，特别是敏感的致命肼分子。这些电流型传感器具有许多用于肼传感器的开发的相关特征，例如灵敏度低至10-5 M的肼在水中，对肼的选择性比对9种其他水溶性常见分析物的选择性高一个数量级，在水冲洗后完全恢复其基本信号的能力和非常低的电压操作。我们的OECT检测肼的特异性是由其在栅电极处的催化氧化引起的，并且能够增加器件的输出电流调制。这使得整个系列的80微米的OECT设备与亚20纳米PEDOT：PSS层，通道长度下降到1微米和共面和同心电极的特定设备的几何形状的设备几何形状的研究。众多的几何形状揭示了OECT机制的新方面，该机制控制着设备的电化学感测行为，更具体地说，是在微观尺度上固有的接触的影响。通过降低器件串扰，微米门集成径向OECT将有助于减少读出侵入性，从而促进OECT生物传感器的进一步发展。
英文摘要：
We report on hydrazine-sensing organic electrochemical transistors (OECTs) with a design consisting in concentric annular electrodes. The design engineering of these OECTs was motivated by the great potential of using OECT sensing arrays in fields such as bioelectronics. In this work, PEDOT:PSS-based OECTs have been studied as aqueous sensors, specifically sensitive to the lethal hydrazine molecule. These amperometric sensors have many relevant features for the development of hydrazine sensors, such as a sensitivity down to 10-5 M of hydrazine in water, an order of magnitude higher selectivity for hydrazine than for 9 other water soluble common analytes, the capability to recover entirely its base signal after water flushing and a very low voltage operation. The specificity for hydrazine to be sensed by our OECTs is caused by its catalytic oxidation at the gate electrode and enables increasing the output current modulation of the devices. This has permitted the device-geometry study of the whole series of 80 micrometric OECT devices with sub-20-nm PEDOT:PSS layers, channel lengths down to 1um and a specific device geometry of coplanar and concentric electrodes. The numerous geometries unravel new aspects of the OECT mechanisms governing the electrochemical sensing behaviours of the device, more particularly the effect of the contacts which are inherent at the micro-scale. By lowering the device cross-talking, micrometric gate-integrated radial OECTs shall contribute to the diminishing of the readout invasiveness and therefore promotes further the development of OECT biosensors.
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