氨基化多孔硅电极用于纳米银的尺寸选择性电化学检测  

Amino-functionalized porous silica electrode for size-selective electrochemical detection of silver nanoparticles

作　　者：段烁 占可 宫智勇 陈季旺 DUAN Shuo;ZHAN Ke;GONG Zhi-yong;CHEN Ji-wang(College of Food Science and Technology,Wuhan Polytechnic University,Wuhan 430023,China)

机构地区：[1]武汉轻工大学食品科学与工程学院,粮油深加工教育部重点实验室,湖北武汉430023

出　　处：《化学研究与应用》2022年第7期1626-1631,共6页Chemical Research and Application

基　　金：“十三五”国家重点研发计划(2019YFC1606001)资助;农产品加工与转化湖北省重点实验室开放课题(2020HBSQGDKFB08)资助。

摘　　要：本文制作了氨基化多孔硅电极,并通过XRD、SEM和红外光谱等技术对电极进行表征与测试。结果显示,氨基化多孔硅成功的负载在导电玻璃上,并形成了多孔电极。本文进一步将其应用于三种不同尺寸(4nm、7nm和32nm)的纳米银的电化学研究。结果表明,由于氨基基团对银的富集作用和孔道结构对银的尺寸选择作用,氨基化多孔硅电极能排除较大尺寸纳米银的干扰,而选择性检测较小尺寸的纳米银。在含有较高浓度7nm和32nm的纳米银的模拟溶液中,对电极的分析性能进行测试。结果显示,电极对4nm纳米银的检测回收率为100.9-103%。且单电极重复测试和多电极平行测试得到的相对标准偏差分别为3.3%和2.4%。实验结果表明,本文所制备的电极具备良好的分析性能,可用于不同尺寸纳米银的选择性电化学检测。In this paper,amino-functionalized silica electrode was fabricated and characterized by XRD,SEM and FT-IR.The results showed that the amino-functionalized porous silica were successfully loaded on Indium tin oxide and to form porous electrode.The porous electrode was further involved to investigate the electrochemical behaviours of three kinds of silver nanoparticles,with their particle sizes at 4 nm,7 nm and 32 nm,respectively.The results showed that the obtained electrode could eliminate the interference of larger-sized silver nanoparticles and selectively detect smaller-sized silver nanoparticles due to the enrichment effect of amino groups and the size selection effect of pore structures.The analytical performance of the amino-functionalized porous silica electrode was evaluated in simulated solution containing high-concentration of 7 nm and 32 nm silver nanoparticles.The recovery rates for 4 nm silver nanoparticles were 100.9%-103%.The relative standard deviations(RSD)for repeated testing and parallel testing were 3.3%and 2.4%,respectively.The experimental results showed that the obtained electrode exhibited good analytical performance and could be used for selective electrochemical detection of silver nanoparticles of different sizes.

关 键 词：纳米银 尺寸选择 多孔硅 电化学检测。 

分 类 号：TQ314[化学工程—高聚物工业]