石墨烯
材料科学
检出限
纳米复合材料
微分脉冲伏安法
安培法
电化学气体传感器
电催化剂
壳聚糖
氧化物
循环伏安法
化学工程
电化学
选择性
纳米颗粒
电极
催化作用
纳米技术
色谱法
化学
有机化学
物理化学
工程类
冶金
作者
Mohammad Maksudur Rahman,Md. A. Rashed,N. I. Nayem,Rahaman M. Abdur,Jahir Ahmed,M. Faisal,Mohammed Jalalah,Farid A. Harraz
标识
DOI:10.1016/j.matchemphys.2024.128915
摘要
In this study, a novel electrocatalyst designed by doping gold nanoparticles (AuNPs) over the reduced graphene oxide (rGO)/Chitosan (CTSN) matrix for the determination of N-acetyl-4-aminophenol, i.e. acetaminophen (AC) in phosphate buffer solution has been reported. The catalyst was synthesized via a simple ultra-sonication process followed by a photo-reduction technique to obtain 1%AuNPs@5%rGO/CTSN nanocomposite. The conductivity of the CTSN biopolymer was enhanced by coupling rGO and thereafter rGO/CTSN surface was decorated with nano-Au particles to improve the catalytic efficiency. The structural and surface properties of the as-fabricated nanocomposite have been thoroughly investigated using cutting–edge microscopic and spectroscopic techniques. The catalytic and sensing phenomena were systematically studied with several well-known electrochemical techniques. Using differential pulse voltammetry (DPV), the peak current was found to be linear across the AC concentration range of 0.50 μM–39.31 μM, with a high sensitivity of 2.358 μAμM−1cm−2 and a low limit of detection (LOD) of 0.06 μM. Moreover, under optimal experimental conditions, the amperometric (i-t) study showed a high sensitivity value of 0.935 μA μM−1cm−2, a wide AC detection range (5.0 μM–160 μM), and LOD 0.151 μM. The proposed sensor also demonstrated high selectivity in the existence of common interfering species. In addition, this newly fabricated sensor electrode exhibited admirable reproducibility, repeatability, and remarkable storage and operational stability. It was also successfully applied to AC recovery tests in real samples as a pharmaceutical formulation.
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