碳纳米管/壳聚糖衍生物传感器的制备及表征  

Preparation and Characterization of Sensors of Carborn Nanotubes/Derivatives of Chitosan

作　　者：张洁[1] 庞雪辉[1,2] 隋卫平[1] 谭福能[1] 侯保荣[2] 

机构地区：[1]济南大学化学化工学院,山东济南250022 [2]中国科学院海洋研究所腐蚀与防护中心,山东青岛266071

出　　处：《济南大学学报（自然科学版）》2011年第3期252-255,共4页Journal of University of Jinan(Science and Technology)

基　　金：国家科技支撑计划(082603101c);中国科学院海洋研究所海洋腐蚀与防护研究发展中心开放课题(200901005);济南大学博士基金(XBS0899)

摘　　要：以壳聚糖(CTS)、O-羟丙基壳聚糖(HPCHS)和O-羟丙基-N-辛基壳聚糖(O-HP-N-C8-CTS)为分散剂,采用滴涂法制备3种多壁碳纳米管(MWCNTs)/CTS衍生物传感器;以铁氰化钾(K3Fe(CN)6)为电化学探针,采用循环伏安法和交流阻抗法作电化学表征。结果表明:K3Fe(CN)6在MWCNTs/CTS衍生物传感器上出现氧化还原峰,峰电位较MWC-NTs/CTS传感器负移50 mV,电流显著增加;MWCNTs/HPCHS修饰电极的阻抗值较小,电荷转移电阻Rct最小为1 256Ω,电化学活性最高;修饰电极的交流阻抗谱高频部分为半圆,低频部分为直线,表明传感器上的反应受扩散和反应动力学共同控制。Chitosan,hydroxypropyl chitosan and O-hydroxypropyl-N-octyl chitosan which work as a new carbon nanotube dispersion were employed to prepare new electrochemical sensors by dropping solutions directly on electrodes.Cyclic voltammetry and AC impedance method were employed to characterize the sensors with K3Fe（CN）6 as a chemical probe.Experimental results show that the sensitive redox peak of K3Fe（CN）6 on the modified electrodes appears in cyclic voltammetry,with the peak potential negatively shifting 50 mV,and the current also significantly increases,and that the impedance value of MWCNTs/HPCHS modified electrode is small,with the smallest charge transfer resistance of 1 256 Ω,and its electrochemical activity is the highest.The electrode impedance spectra of all the modified electrodes is semicircle in the high frequency and straight line in low frequency,which indicates the process on the modified electrodes is controlled by diffusion and kinetics.

关 键 词：壳聚糖及衍生物 传感器 循环伏安法 交流阻抗法 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]