摘要
将碳纳米管(CNT)和纳米二氧化锰(Nano-MnO2)分散在壳聚糖(CHIT)溶液中,用涂敷法固定到玻碳电极表面,制成修饰电极。由于碳纳米管具有良好的电子传递性能,使纳米二氧化锰对H2O2的电催化活性明显提高,通过循环伏安法、计时电流法对传感器的性能进行了研究。在最佳测试条件下,该传感器对H2O2的线性范围为1.5×10-6～5.0×10-2mol/L,检出限为4×10-7mol/L。用于实际样品的测定,结果满意。
A hydrogen peroxide amperometric biosensor was fabricated by immobilizing the composite of carbon nanotubes and MnO2 nanoparticles, which were dispersed in chitosan solution, onto glassy carbon electrode surface. With the introduction of carbon nanotubes（ CNT）, the electrocatalytical activity of MnO2 nanoparticles was improved for 10 times due to the excellent electron-transfer ability of CNT. The electrochemical characteristics of the biosensor were studied by cyclic vohammetric and chronoampermetric methods. There was a linear relationship between the oxidation currents and the concentrations of hydrogen peroxide in the concentration range of 1.5 ×10^-6 -5.0 ×10^-2 mol/L with detection limit of 4 ×10^-7 mol/L. The method was used for determination of hydrogen peroxide in disinfector sample with satisfactory result.
出处
《分析测试学报》
CAS
CSCD
北大核心
2008年第11期1203-1205,1209,共4页
Journal of Instrumental Analysis
基金
教育部科学研究重点资助项目(207087)
广西高校百名中青年学科带头人计划资助项目(桂教人[2005]64-15)
广西自然科学基金资助项目(0728214)
关键词
碳纳米管
纳米二氧化锰
过氧化氢
传感器
壳聚糖
carbon nanotubes
MnO2 nanoparticles
hydrogen peroxide
biosensor
chitosan
