尺寸相关氯化氮掺杂碳纳米管:用作儿茶酚和间苯二酚的电化学探测器

IF 2.3 Q3 ELECTROCHEMISTRY International journal of electrochemistry Pub Date : 2023-07-24 DOI:10.1155/2023/7977453
W. K. Maboya, Mologadi Nkiyasi Rantho
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引用次数: 0

摘要

在本研究中,通过改变原料中氯的浓度,制备了不同尺寸的氮掺杂碳纳米管(NCNTs)。当将NCNTs涂覆在玻碳电极(GCE)上并用于检测儿茶酚(CC)和间苯二酚(RS)时,发现NCNTs的直径会影响纳米材料的传感能力。当向乙腈进料中添加低浓度的氯时,产生较大直径的NCNTs(记为NCNTs(2:1)),而当添加高浓度的氯时,产生较小直径的NCNTs(记为NCNTs(2:1))。这项研究表明,在NCNTs的制备过程中加入可控量的氯可以产生具有不同性质的纳米结构。当GCE包覆NCNTs(2:1)时,CC和RS的阳极峰增强,从而获得最大的电流响应,这归因于NCNTs的大直径和高石墨性质,从而促进了电子转移,扫描电镜(SEM)、拉曼光谱(Raman spectroscopy)和x射线光电子能谱(XPS)分析都证明了这一点。CC和RS的检测限分别为0.059 μM (CC)和0.034 μM (RS) (3S/M)。
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Size-Dependent Chlorinated Nitrogen-Doped Carbon Nanotubes: Their Use as Electrochemical Detectors for Catechol and Resorcinol
In this study, various-sized nitrogen-doped carbon nanotubes (NCNTs) were fabricated by varying the concentration of chlorine in the feed. The diameter of the NCNTs was found to influence the sensing ability of the nanomaterials when coated onto the glassy carbon electrode (GCE) and used for the detection of catechol (CC) and resorcinol (RS). Larger diameter NCNTs (denoted NCNTs (2 : 1)) were produced when a low concentration of chlorine was added into the acetonitrile feed, whereas smaller diameter NCNTs (denoted NCNTs (1 : 2)) were produced when a large concentration of chlorine was added. This investigation revealed that the addition of controllable amounts of chlorine during the fabrication of NCNTs led to the creation of nanostructures with different properties. The greatest current response which was evidenced by an enhanced anodic peak of CC and RS was obtained when GCE was coated with NCNTs (2 : 1), and this was attributed to their large diameter and high graphitic nature which facilitated electron transfer as evidenced by scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) analysis. A linear response was obtained when varying the concentration of both CC and RS, with the limits of detection of about 0.059 μM (CC) and 0.034 μM (RS) (3S/M) obtained.
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