Deposition of new thia-containing Schiff-base iron (III) complexes onto carbon nanotube-modified glassy carbon electrodes as a biosensor for electrooxidation and determination of amino acids
作者:Lotfali Saghatforoush、Mohammad Hasanzadeh、Nasrin Shadjou、Balal Khalilzadeh
DOI:10.1016/j.electacta.2010.10.031
日期:2011.1
Multiwall carbon nanotubes (MWCNTs) were used as an immobilization matrix to incorporate an Fe (III)–Schiff base complex as an electron-transfer mediator onto a glassy carbon electrode surface. First, the preheated glassy carbon was subjected to abrasive immobilization of MWCNTs by gently rubbing the electrode surface on filter paper supporting the carbon nanotubes. Second, the electrode surface was
多壁碳纳米管(MWCNT)用作固定基质,将Fe(III)–Schiff碱配合物作为电子转移介体掺入玻璃碳电极表面。首先,通过在支撑碳纳米管的滤纸上轻轻摩擦电极表面,对预热的玻璃碳进行MWCNT的磨料固定。其次,通过浇铸100μLFe(III)络合物溶液(ACN中为0.01 M)来修饰电极表面。水溶液中修饰电极的循环伏安图显示了一对定义明确,稳定且几乎可逆的具有表面受限特性的还原氧化还原系统。MWCNTs和Fe(III)-Schiff碱配合物独特的电子和电催化性能的组合产生了显着的协同增效作用。通过循环伏安法表征了修饰电极在pH 1–9的水溶液中的电化学行为和稳定性。表观电子传递速率常数(K s)和传递系数(a)通过循环伏安法测定,分别约为7 s -1和0.55。修饰的电极在酸性溶液中具有非同寻常的正电位,对氨基酸的氧化表现出出色的催化活性。它们还显示出在宽pH范围,快速响应时间,高灵敏度,