Fabrication of surface renewable carbon microelectrode arrays and their application in heavy metal ion sensing

[摘要] In this paper, surface renewable carbon microelectrode arrays (MEAs) were developed using microfabrication technology and were successfully applied in heavy metal ion sensing. The as-prepared carbon microelectrode was fabricated with a cylindrical shape 50 μm in diameter and 300 μm in height. Cyclic voltammetry (CV) analysis with scan rates ranging from 10 mV s−1 to 100 mV s−1 was utilized to characterize the MEAs, and it was found that the typical properties (flat redox peaks) of MEAs appeared at lower scan rates (<30 mV s−1). Heavy metal ions, including Cd2+, Pb2+ and Cu2+ were chosen to demonstrate the performance of the developed MEAs for electrochemical sensor applications, with the detection limit calculated to be 1 μg L−1. Renewability and repeatability experiments were also carried out to demonstrate the good characteristics of the MEAs. This work developed a novel microfabrication technique for low cost surface renewable MEAs that can be used as an electrochemical platform for a wide range of sensor applications.

[学科分类] 分析化学