重氮盐官能化swcnts修饰玻碳电极的电化学表征

María Belén Piccoli, R. Vico, N. Ferreyra
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摘要

尽管碳纳米管具有独特的性能,但在实际应用中最大的缺点之一是难以在给定的溶剂中形成单个纳米管的分散体。碳纳米管的共价功能化允许在纳米管表面结合化学基团,根据其极性,促进在不同溶剂中的分散性。在这项工作中,单壁碳纳米管通过由4-氨基苯甲酸得到的重氮盐自发接枝得到swcnts - pb。所获得的纳米材料通过共价结合官能团的几种方法进行了表征。将swcnts - pb分散于50% V/V的乙醇/水中,用紫外-可见分光光度法测定其脱落程度。在最佳条件下,swcnts - pb的分散稳定性可达45天以上。用纳米材料修饰的玻碳电极(GCE)的电容电流显著增加,由于氧化还原物质限制在swcnts - pb表面,其阳极峰值电流与扫描速率呈线性关系,因此呈现法拉第过程。改性电极对抗坏血酸(AA)和H2O2氧化还原电流的显著增加也表现出催化反应。分散体的稳定性和优异的电化学响应使得这种纳米材料在电化学检测中的应用非常有趣。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ELECTROCHEMICAL CHARACTERIZATION OF GLASSY CARBON ELECTRODES MODIFIED WITH SWCNT FUNCTIONALIZED WITH DIAZONIUM SALT
Although carbon nanotubes have unique properties, one of the biggest drawbacks in practice is the difficulty in forming dispersions of individual nanotubes in a given solvent. Covalent functionalization of carbon nanotubes allows the incorporation of chemical groups at the nanotube surface that, according to its polarity, facilitates the dispersibility in different solvents. In this work, singled-wall carbon nanotubes were functionalized by spontaneous grafting with a diazonium salt obtained from the 4-aminobenzoic acid to obtain SWCNT-pB. The nanomaterial obtained was characterized by several methodologies that the covalent incorporation of the functional groups. SWCNT-pB were dispersed in ethanol/water 50% V/V under ultrasonic treatment, and the exfoliation degree was evaluated by UV-Vis spectrophotometry. under optimal conditions, SWCNT-pB dispersion was stable for more than 45 days. Glassy carbon electrodes (GCE) modified with the nanomaterial show significant increases in their capacitive current and a faradaic process due to redox species confined on the surface of SWCNT-pB whose anodic peak currents depend linearly with the scan rate. The modified electrodes also show a catalytic response towards ascorbic acid (AA) and notorious increments in the oxidation and reduction currents of H2O2. The stability of the dispersions and the excellent electrochemical responses obtained make this nanomaterial very interesting for its application in electrochemical detection.
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