Construction of a new functional platform by grafting poly(4-vinylpyridine) in multi-walled carbon nanotubes for complexing copper ions aiming the amperometric detection of l-cysteine

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• 作者：Cecí ; lia de Carvalho Castro e Silva^a ; ^b ; Má ; rcia Cristina Breitkreitz^a ; ^b ; Murilo Santhiago^a ; ^b ; Cá ; tia Crispilho Corrê ; a^a ; ^b ; Lauro Tatsuo Kubota^a ; ^b ; ^{kubota@iqm.unicamp.br}
• 关键词：Functional platform ; MWCNTs ; Nanocomposite ; Amperometric sensor ; l-cysteine
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 June, 2012
• 卷：71
• 期：Complete
• 页码：150-158
• 文件大小：1132 K

摘要

This work describes the preparation of an amperometric sensor for electrocatalytical detection of l-cysteine (Cys). The developed sensor is based on a functional platform to complex copper ions on multi-walled carbon nanotubes (MWCNTs) modified with poly-4-vinylpyridine (PVP) through an in situ polymerization. The obtained values for the kinetic constants of heterogeneous electron transfer rate (k_s) and for chemical reaction (k_obs) between Cu²⁺ and cysteine were 5.78 s^鈭? and 6.96 L mol^鈭? s^鈭?, respectively. The analytical curve showed a linear response range for detecting l-cysteine in concentrations from 5 to 60 渭mol L^鈭?. The detection and quantification limits obtained were 1.50 and 5.00 渭mol L^鈭?, respectively with a response time of 0.10 s at an applied potential of 150 mV vs SCE.