纳米绿色化学合成Au/MWCNT修饰的河水亚甲基蓝电化学传感器。

IF 4.6 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Seleke J Mokole, Omolola E Fayemi
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引用次数: 0

摘要

本研究探索了新型金纳米粒子(AuNP)和多壁碳纳米管(MWCNT)纳米复合材料的发展,用于亚甲基蓝(MB)染料检测,利用绿色(Augrn)和化学(Auchm)合成方法。利用傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对绿色和化学途径合成的纳米材料进行了全面分析,发现Auchm和Augrn的粒径分别为13.66 nm和14.86 nm。紫外-可见光谱(UV)和x射线衍射(XRD)显示晶粒尺寸在5.36 ~ 21.26 nm之间。通过循环伏安法(CV)、电化学阻抗谱(EIS)和方波伏安法(SWV)进行的电化学分析显示,合成材料之间存在明显的电流响应。计算电极的电化学活性表面积EASA,其值分别为0.053 cm2 (Auchm/MWCNTs)、0.031 cm2 (Augrn/MWCNTs)、0.024 cm2 (MWCNTs)、0.006 cm2 (Augrn)、0.005 cm2 (Auchm)和0.002 cm2(裸)。EIS显示的R ct值依次为:Augrn/MWCNTs、MWCNTs、Auchm/MWCNTs、Auchm、Augrn、裸电极的R ct值依次为32.20 Ω < 34.02 Ω < 36.61 Ω < 3.4 × 105 Ω < 3.7 × 105 Ω < 5.6 × 105 Ω,除了裸电极的n值为0.87外,其余均与FeCN中的CV氧化峰相关。MWCNTs的氧化电流响应依次为124.29 μA, Augrn/MWCNTs为114.77 μA, Auchm/MWCNTs为60.85 μA, Auchm为18.96 μA, bare为2.81 μA, Augrn为2.08 μA。Auchm/MWCNTs的检出限(LOD)和定量限(LOQ)分别为20.62 nM和62.51 nM, Augrn/MWCNTs的检出限(LOD)和定量限(LOQ)分别为20.23 nM和61.30 nM,表明Augrn/MWCNTs的灵敏度略高。对现实环境样品的分析证明了合成电极的实用性,回收率在90%到107%之间(n = 3)。这些发现强调了所开发的纳米复合材料检测MB的可靠性和敏感性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A nano-powered green and chemically synthesized Au/MWCNT modified electrochemical sensor for methylene blue detection in river water.

This study explores the development of novel gold nanoparticle (AuNP) and multi-walled carbon nanotube (MWCNT) nanocomposites for methylene blue (MB) dye detection, leveraging both green (Augrn) and chemical (Auchm) synthesis methods. A thorough analysis of the nanomaterials synthesized using green and chemical routes was performed utilizing Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM), revealing particle sizes of 13.66 nm and 14.86 nm for Auchm and Augrn, respectively. UV-visible spectroscopy (UV) and X-ray diffraction (XRD) reveal crystallite sizes ranging from 5.36 nm to 21.26 nm. Electrochemical analysis via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and square-wave voltammetry (SWV) revealed distinct current responses among the synthesized materials. EASA, which is the electrochemical active surface area of the electrodes was calculated, and the values were 0.053 cm2 (Auchm/MWCNTs), 0.031 cm2 (Augrn/MWCNTs), 0.024 cm2 (MWCNTs), 0.006 cm2 (Augrn), 0.005 cm2 (Auchm), and 0.002 cm2 (bare). EIS showed R ct values in the following order: 32.20 Ω < 34.02 Ω < 36.61 Ω < 3.4 × 105 Ω < 3.7 × 105 Ω < 5.6 × 105 Ω for Augrn/MWCNTs, MWCNTs, Auchm/MWCNTs, Auchm, Augrn, and bare electrode, respectively, which correlated with CV oxidation peaks in FeCN, except for the bare electrode due to the n-value of 0.87. The oxidation current response in MB decreased in the order of 124.29 μA for MWCNTs, 114.77 μA for Augrn/MWCNTs, 60.85 μA for Auchm/MWCNTs, 18.96 μA for Auchm, 2.81 μA for bare, and 2.08 μA for Augrn. The limits of detection (LOD) and quantification (LOQ) were determined to be 20.62 nM and 62.51 nM for Auchm/MWCNTs and 20.23 nM and 61.30 nM for Augrn/MWCNTs, respectively, indicating slightly superior sensitivity for Augrn/MWCNTs. Analysis of real-life environmental samples demonstrated the practical applicability of the synthesized electrodes, with recovery percentages ranging from 90% to 107% (n = 3). These findings underscore the dependability and sensitivity of the developed nanocomposites for MB detection.

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来源期刊
Nanoscale Advances
Nanoscale Advances Multiple-
CiteScore
8.00
自引率
2.10%
发文量
461
审稿时长
9 weeks
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