文献类型：期刊文献

英文题名：A Mercury Ion Electrochemical Sensor Based on Porous Anodized Alumina Membrane Nanochannels Modified with DNA

作者：Mo, Rijian[1];Yuan, Qiong[1];Yan, Xiemin[1];Su, Tiantian[1];Feng, Yanting[1];Lv, Lulu[2];Zhou, Chunxia[1,3,4];Hong, Pengzhi[1,3,4];Sun, Shengli[2,5];Li, Chengyong[2,3,4,5]

机构：[1]Guangdong Ocean Univ, Coll Food Sci & Technol, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Sch Chem & Environm, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Shenzhen Inst, Shenzhen 518108, Peoples R China;[4]Guangdong Ocean Univ, Guangdong Modern Agr Sci & Technol Innovat Ctr, Zhanjiang 524088, Peoples R China;[5]Guangdong Ocean Univ, Coastal Ecol Engn Technol Res Ctr Zhanjiang City, Zhanjiang 524088, Peoples R China

年份：2018

卷号：165

期号：11

起止页码：H750

外文期刊名：JOURNAL OF THE ELECTROCHEMICAL SOCIETY

收录：SCI-EXPANDED(收录号：WOS:000443274800002)、、EI(收录号：20192607089545)、Scopus(收录号：2-s2.0-85057651461)、WOS

基金：This work was supported by the National Natural Science Foundation of China (21874029), Science and Technology Planning Project of Guangdong Province (2016A020210114), Science and Technology Planning Project of Zhanjiang City (2015A03025, 2016C01002), the National Natural Science Foundation of Guangdong Ocean University (C17381), Graduate Education Innovation Program of Guangdong Ocean University (201733), Science and Technology Planning Project of Shenzhen City (JCYJ20170818111719650) and Industrial Development Special Funds of Dapeng New Area (KY20170209).

语种：英文

外文关键词：Alumina - Membranes - Chemical modification - Gold nanoparticles - DNA - Electrochemical sensors - Condensation reactions - Metal ions - Mercury (metal)

外文摘要：A novel mercury ion (Hg2+) electrochemical sensor was established via chemical modification of porous anodic alumina (PAA) membrane nanochannels with DNA. PAA membrane was prepared by a two-step anodization. Amino groups were introduced to nanochannels by silanization. Special sequence DNA (along with amino group) was modified on PAA membrane nanochannels by the condensation reaction of amino and aldehyde groups. Electrochemical detector was built via sputtered Au nanoparticles on the surface of PAA nanochannels, which could be used as working electrode. The reduction potential of 0 V was applied, where the flux of Fe(CN)(6)(3-) was determined by diffusion. The current response has a positive correlation with the concentration of Fe(CN)(6)(3-). After DNA immobilized, the negative charge and the steric hindrance of the nanochannels is increased, resulting in the decreasing of the flux of Fe(CN)(6)(3-). The detection current is reduced compared with pure PAA membrane nanochannels. When Hg2+ is present, a stable thymine-Hg2+-thymine structure is formed due to the specific reaction between thymine in DNA and Hg2+. In this case, the charge density and steric hindrance of the nanochannels are decreased, thereby increasing the flux of Fe(CN)(6)(3-) and restoring current. The results show that the detection limit is about 0.08 pM with a good linear response (from 1 pM to 100 nM). Meanwhile, the sensor has a good selectivity. The current responses of other metal ions (Mn2+, Mg2+, Ba2+, Co2+ and Cd2+) are not obvious compared with Hg2+. Therefore, this new sensor could be applied for detecting Hg2+ in the environment. (C) 2018 The Electrochemical Society.