制备Cu/CuO/ZnO/PPy异质结材料用于海水中Hg^(2+)抗干扰检测  

Fabrication of Cu/CuO/ZnO/PPy Heterojunction Materials for Anti-interference Detection of Hg^(2+) in Seawater

作　　者：李铭 李正明 董晓桐 贾良宾 朱美燕 马晔 赵明岗 崔洪芝 LI Ming;LI Zheng-Ming;DONG Xiao-Tong;JIA Liang-Bin;ZHU Mei-Yan;MA Ye;ZHAO Ming-Gang;CUI Hong-Zhi(Department of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学材料科学与工程学院,青岛264100

出　　处：《分析化学》2021年第9期1497-1505,共9页Chinese Journal of Analytical Chemistry

基　　金：中央高校基本科研业务费专项资金项目(Nos.202042009,201964011);国家自然科学基金项目(No.52072353)资助。

摘　　要：Hg^(2+)污染对人类健康和生态环境构成重大威胁,但目前仍缺乏直接、灵敏的Hg^(2+)检测技术。本研究通过碱性氧化法和水热法制备了Cu/CuO/ZnO丝,采用电化学聚合的方法将聚吡咯(PPy)覆盖到材料表面。利用p-n结势垒驱动电化学信号响应的原理将材料用于Hg^(2+)的直接电化学检测,进行了微分脉冲伏安法测试。复合材料在200~1600 nmol/L的Hg^(2+)浓度范围内具有良好的线性关系,以及超高灵敏度(1010.82μA·L/(nmol·cm^(2)))和超低检出限(2.1 pmol/L)。基于界面势垒的新型传感模式消除了其它离子的干扰,在自来水、河水以及海水中的Hg^(2+)的加标回收率为97.3%~105.0%,RSD为1.8%~5.6%。这种利用p-n结势垒的方法可推广至其它检测重金属离子的传感器的开发研究。Hg^(2+)pollutant poses significant risks to human health and the ecological environment.However,the direct and sensitive detection technique for Hg^(2+)has been lacking at the present time.In this study,Cu/CuO/ZnO wire was fabricated by alkaline oxidation method and hydrothermal method,and PPy was covered on the material surface by electrochemical polymerization method.Based on the principle that the p-n junction barrier drives the electrochemical signal response,the material was used for direct electrochemical detection of Hg^(2+)and differential pulse voltammetry was performed.The prepared composite was successfully used for detection of Hg^(2+)in the concentration range from 200 nmol/L to 1600 nmol/L,with a ultra-high sensitivity(1010.82μA·L/(nmol·cm^(2)))and a ultra-low detection limit(2.1 pmol/L).The novel sensing mode based on the interface barrier eliminated the interference of other ions and achieved good recoveries(97.3%-105.0%)in tap water,river water and sea water,with RSD of 1.8%-5.6%.This approach could be extended to develop new sensors for other heavy metals by employing p-n junction barrier.

关 键 词：P-N结 汞离子 界面势垒 电化学检测 金属丝 

分 类 号：O657.1[理学—分析化学] X834[理学—化学]