SWCNT-DNA修饰电极的制备及其电化学检测性能

新型炭材料, 2009, 24(2): 183-186.

SWCNT-DNA修饰电极的制备及其电化学检测性能

向东亚 ^1, , 苏珍 ^2, , 赵琢 ^3, , 杨鎏俭 ^4, , 杨全红 ^5,

1.天津大学,化工学院,天津,300072

2.天津大学,化工学院,天津,300072

3.天津出入境检验检疫局,天津,30019

4.天津大学,化工学院,天津,300072

5.天津大学,化工学院,天津,300072

基金项目: 资助项目和煤转化国家重点实验室开放项目(08-913) 教育部新世纪优秀人才支持计划(NCET-07-0607) 国家自然科学基金(50842060) 天津市应用基础及前沿技术研究计划(07JCYBJC15200)

关键词：单壁碳纳米管 , 单链DNA , 修饰玻炭电极 , 铁氰化钾 , 电化学检测

Preparation of a SWCNT-DNA modified electrode and its electrochemical detection property

利用单壁碳纳米管(SWCNT)与单链DNA(ssDNA)自组装生成单根离散的sWCNT-DNA复合物,将其吸附在玻炭(GC)电极表面形成一层SWCNTT-DNA薄膜,构建SWCNT-DNA修饰玻炭电极.循环伏安测试表明,与裸玻炭电极和未分散SWCNT修饰的玻炭电极相比,该电极的响应峰电流明显增大,而且在一定范围内对不同浓度的铁氰化钾有一个线性响应,表现出良好的灵敏度和稳定性.ssDNA通过缠绕在SWCNT外壁使其离散,可提高电极的有效表面积,加快Fe(CN)3-6/Fe(CN)4-6-氧化还原反应的电子传递,使之表现出良好的电化学检测性能.

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