基于还原氧化石墨烯-海藻酸钠复合材料的铜离子侦测芯片技术  

Detecting Copper Ions Utilizing the Microchip Loaded with Composite Material Consisting of Reduced Graphene Oxide and Sodium Alginate

作　　者：朱晓璐[1] 赵文杰 程浩 何凤良 朱春波 Zhu Xiaolu;Zhao Wenjie;Cheng Hao;He Fengliang;Zhu Chunbo(College of Mechanical and Electrical Engineering,Hohai University,Jiangsu,213200;Condas(Nanjing)Technology Co.,Ltd.,Jiangsu,210036)

机构地区：[1]河海大学机电工程学院,江苏213200 [2]康达斯(南京)科技有限公司,江苏210036

出　　处：《当代化工研究》2024年第22期187-190,共4页Modern Chemical Research

摘　　要：还原氧化石墨烯(rGO)作为一种导电材料可用于电化学侦测Cu^(2+),但是rGO材料在水体中容易发生堆叠现象,降低电化学检测性能,海藻酸钠(Sodium Alginate,SA)作为一种聚电解质可以有效抑制rGO的堆积。鉴于此,对制备掺杂rGO微片的海藻酸盐凝胶材料进行了研究,并结合微电极芯片实现对浓度从mM级至pM级Cu2+样品的电化学测量。试验结果表明:“石墨烯凝胶复合物”可以在低浓度条件下实现对Cu2+浓度的电化学测量,检测铜离子的最低浓度约为1×10^(-12 )mol/L,且对应的检测灵敏度大于42.8 dB(未覆盖金薄膜芯片上42.83 dB,覆盖金薄膜芯片上49.15 dB)。Reduced graphene oxide(rGO)as a conductive material can be used in the electrochemical detection of Cu^(2+),but rGO material tends to stack in water,which compromises the electrochemical performance.Sodium alginate(SA)as a polyelectrolyte can effectively inhibit the accumulation of rGO.Hence,this study proposes to measure the Cu2+samples with the magnitude order of concentration from mM to pM by dispersing rGO microplates in alginate gel to form a composite material as an aggregated micro-absorber,which is loaded on the microelectrode-chip.The results show that rGO-gel composite can realized the measurement of Cu2+concertation with minimum limitation of 1×10^(-12) mol/L,and the sensitivity is high(42.83 dB on the chip without covered gold-film,49.15 dB on the chip with covered gold-film).

关 键 词：还原氧化石墨烯 海藻酸钠 CU2+ 电化学检测 灵敏度 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]