Sensitive electrochemical detection of dopamine using CuCo2O4/graphene quantum dots-modified carbon paste electrode

IF 4.4 3区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Inorganic Chemistry Communications Pub Date : 2024-11-16 DOI:10.1016/j.inoche.2024.113566
Masoumeh Madadi , Masoud Rohani Moghadam , Parisa Salarizadeh , Alireza Bazmandegan-Shamili , Mehdi Shahbakhsh
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Abstract

This research investigates the fabrication and electrochemical characterization of a modified graphene paste electrode (MCPE) incorporating CuCo2O4 bimetallic oxide and its composite with graphene quantum dots (GQDs) for dopamine detection. The CuCo2O4 was synthesized via a hydrothermal method. The oxidation–reduction behavior of dopamine on the GQD/CuCo2O4/CPE indicates a quasi-reversible electrochemical reaction with an absorption-controlled electron transfer process and the kinetics of the catalytic reaction followed pseudo first-order. The average value of the electron transfer rate constant for GQD/CuCo2O4 was observed to be 0.047 s−1. Characterization of the obtained materials was performed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDS). Subsequently, under optimized conditions, cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) were employed to evaluate the dopamine sensing performance of the MCPEs. The GQD/CuCo2O4 composite electrode exhibited a lower detection limit (0.004 μM) and quantification limit (0.013 μM) for DA compared to the CuCo2O4 electrode (0.0088 μM and 0.030 μM, respectively). The GQD/CuCo2O4 nanocomposite showed better sensitivity (33.0 mA/mM) than CuCo2O4 (17.9 mA/mM) due to the superior conducting nature of GQD. Finally, the applicability of the GQD/CuCo2O4-based MCPE was demonstrated by measuring DA in real samples.

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CuCo2O4/石墨烯量子点修饰碳糊电极对多巴胺的灵敏电化学检测
本研究研究了CuCo2O4双金属氧化物及其与石墨烯量子点(GQDs)复合的改性石墨烯膏状电极(MCPE)的制备和电化学表征,用于多巴胺检测。采用水热法合成了CuCo2O4。多巴胺在GQD/CuCo2O4/CPE上的氧化还原行为表明,该电化学反应为准可逆的吸收控制的电子转移过程,催化反应动力学服从准一级反应。GQD/CuCo2O4的电子传递速率常数平均值为0.047 s−1。利用x射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)和能量色散x射线能谱(EDS)对所得材料进行表征。随后,在优化条件下,采用循环伏安法(CV)、差分脉冲伏安法(DPV)和电化学阻抗谱法(EIS)对mcpe的多巴胺感知性能进行了评价。GQD/CuCo2O4复合电极的DA检出限(0.004 μM)和定量限(0.013 μM)均低于CuCo2O4电极(分别为0.0088 μM和0.030 μM)。GQD/CuCo2O4纳米复合材料的灵敏度为33.0 mA/mM,高于CuCo2O4 (17.9 mA/mM)。最后,通过测量实际样品的DA,验证了GQD/ cuco2o4基MCPE的适用性。
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来源期刊
Inorganic Chemistry Communications
Inorganic Chemistry Communications 化学-无机化学与核化学
CiteScore
5.50
自引率
7.90%
发文量
1013
审稿时长
53 days
期刊介绍: Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.
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