High-performance Pt/Ti3C2Tx MXene based graphene electrochemical transistor for selective detection of dopamine.
High-performance Pt/Ti3C2Tx MXene based graphene electrochemical transistor for selective detection of dopamine.
复制标题
DOI：
10.1016/j.aca.2022.339653
复制
发表时间：
2022-02
影响因子：
6.2
通讯作者：
Rui Zhou;Bo Tu;D. Xia;Hanping He;Zhiwei Cai;Nan Gao;G. Chang;Yunbin He
中科院分区：
文献类型：
--
作者：
Rui Zhou;Bo Tu;D. Xia;Hanping He;Zhiwei Cai;Nan Gao;G. Chang;Yunbin He
多巴胺(DA)的准确测量对人体健康监测和疾病预防具有重要意义。本文采用层状液体剥离法制备了高性能的二维Ti3C2TxMXene，并将其用于栅电极的修饰。采用铂/Ti3C2Tx修饰的玻碳电极作为栅极，与单层石墨烯沟道组装成完整的晶体管器件。该装置结合了晶体管的放大效应、Ti3C2TxMXene良好的导电性和纳米铂的优良催化性能，具有较低的检测下限(50 Nm)和较宽的DA检测浓度范围(50 nm-9 mm)。Ti3C2TxMXene不仅为铂纳米粒子的沉积提供了大量的附着位，而且改善了电极材料的导电性和亲水性，从而提高了器件的灵敏度，有利于被测溶液的渗透。另外，Ti3C2TxMXene是带负电荷的，对质子化的DA有一定的静电吸附作用，对带负电荷的干扰物质有静电斥力作用。结果表明，该器件具有良好的选择性，为构建DA传感平台提供了广阔的应用前景。
Accurate measurement of dopamine (DA) is of great significance for human health monitoring and disease prevention. Herein, two-dimensional Ti3C2TxMXene with high performance was prepared by layer liquid exfoliation method and used for the modification of gate electrode. The glassy carbon electrode (GCE) modified with Pt/Ti3C2Txwas used as the gate, and assembled with monolayer graphene channel to form a complete transistor device. The device combines the amplification effect of transistors, good electrical conductivity of Ti3C2TxMXene and excellent catalytic properties of Pt nanoparticles, showing a low detection limit (50 nM) and a wide detection concentration range (50 nM-9 mM) of DA. Ti3C2TxMXene not only provides a large number of attachment sites for the deposition of Pt nanoparticles, but also improves the electrical conductivity and hydrophilicity of the electrode material, thus enhancing the sensitivity of the device and facilitating the penetration of the solution to be measured. In addition, Ti3C2TxMXene is negatively charged, it has a certain electrostatic adsorption effect on protonated DA and electrostatic repulsion effect on negatively charged interfering substances. As a result, the device exhibits good selectivity, which provides a great application prospect for the construction of DA sensing platform.