Lee Jongmin, Kim Soosung, Shin Heungjoo
Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Korea.
Sensors (Basel). 2021 Feb 14;21(4):1346. doi: 10.3390/s21041346.
This article presents the development of a highly sensitive electrochemical heavy metal sensor based on hierarchical porous carbon electrodes with sponge-like edge structures. Micrometer-scale hierarchical nanoporous carbon electrodes were fabricated at a wafer-scale using cost-effective batch microfabrication technologies, including the carbon microelectromechanical systems technology and oxygen plasma etching. The sponge-like hierarchical porous structure and sub-micrometer edges of the nanoporous carbon electrodes facilitate fast electron transfer rate and large active sites, leading to the efficient formation of dense heavy metal alloy particles of small sizes during the preconcentration step. This enhanced the peak current response during the square wave anodic stripping voltammetry, enabling the detection of Cd(II) and Pb(II) at concentrations as low as 0.41 and 0.7 μg L, respectively, with high sensitivity per unit sensing area (Cd: 109.45 nA μg L mm, Pb: 100.37 nA μg L mm).
本文介绍了一种基于具有海绵状边缘结构的分级多孔碳电极的高灵敏度电化学重金属传感器的研制。使用具有成本效益的批量微加工技术，包括碳微机电系统技术和氧等离子体蚀刻，在晶圆级制造了微米级分级纳米多孔碳电极。纳米多孔碳电极的海绵状分级多孔结构和亚微米边缘促进了快速的电子转移速率和大量的活性位点，导致在预浓缩步骤中高效形成尺寸小的致密重金属合金颗粒。这增强了方波阳极溶出伏安法期间的峰值电流响应，能够分别以低至0.41和0.7 μg L的浓度检测Cd(II)和Pb(II)，每单位传感面积具有高灵敏度（Cd：109.45 nA μg L mm，Pb：100.37 nA μg L mm）。
