Facile and ultrasensitive electrochemical impedance sensing for formaldehyde
Facile and ultrasensitive electrochemical impedance sensing for formaldehyde
复制标题
基于可控均质二氧化硅微球中银离子掺杂的甲醛简便超灵敏电化学阻抗传感
DOI：
10.1016/j.snb.2019.01.021
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Li Jing
中科院分区：
文献类型：
--
作者：
Li Honbo;Li Yanli;Li Mengya;Xu Lingqiu;Li Jing
Formaldehyde is a highly reactive and toxic compound in air pollutants, exposure to even a low concentration of formaldehyde will do harm to human health. Herein, a novel electrochemical impedance sensor for formaldehyde has been developed based on Ag+-SiO2 microspheres prepared by the exchange of silver ions with trapped ammonium ions. The probe of silver ion is easily and selectively reduced by formaldehyde, then the silver nanoparticles would be generated. Exposure to more concentration of formaldehyde, more proportionate silver nanoparticles would be loaded on the surface of silica microspheres, and then the decrement of interface charge transfer resistance (Rct) would be obtained accordingly. The decrement of Rct was linear with the concentration of formaldehyde in the range from 2 to 6000 pmol L-1 with a detection limit of 0.5 pmol L-1. Enabled by such a unique sensing mechanism, the fabricated sensor has been successfully applied for the detection of formaldehyde in real samples with high performance in selectivity, low power consumption, sensitivity, cost-effectiveness, facility, and portability.
