结晶度
材料科学
电化学
循环伏安法
微晶
分析化学(期刊)
相(物质)
电极
化学工程
化学
冶金
复合材料
物理化学
色谱法
工程类
有机化学
作者
Tuyet Nhung Pham,Nguyễn Văn Cường,Ngo Xuan Dinh,Van-Tuan Hoang,Vu Ngoc Phan,Nguyen Thi Lan,Man Hoai Nam,Trần Đăng Thành,Vũ Đình Lãm,Nguyễn Văn Qúy,Trần Quang Huy,Manh‐Huong Phan,Anh‐Tuan Le
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-02-01
卷期号:168 (2): 026506-026506
被引量:25
标识
DOI:10.1149/1945-7111/abde80
摘要
For the first time, the influences of phase purity and crystallinity on the electrochemical and electrocatalytic properties of CuCo 2 O 4 (CCO) and CuFe 2 O 4 (CFO)-based electrochemical sensors for the detection of chloramphenicol (CAP) are reported. A series of CCO and CFO nanoparticles were prepared by a modified coprecipitation method and then annealed at different temperatures under air (400 °C, 600 °C, 800 °C, and 1000 °C). Surface morphology, the evolution of the crystallite size, and crystalline phase transition, as well as phase purity of CCO and CFO at each annealing temperature, were characterized via different techniques. Their electrochemical properties were analyzed using cyclic voltammetry and differential pulse voltammetry measurements conducted with a PalmSens3 workstation. Results obtained show that the phase purity and crystallinity have decisive effects on their electrocatalytic activity, conductivity, and adsorption efficiency. Under an optimized condition (more namely, annealed 600 °C), both CCO and CFO samples offer high phase purity with low percent of CuO side phase (below 38%), small enough size with a large number of defects and available active sites; particularly, the cubic CFO nanoparticles are present due to its tetragonal phase transition. The modified electrodes with CCO-600 and CFO-600 exhibit a better voltammetric response, a higher synergistic electrocatalytic activity, and a greater electrochemical performance of comparing to other modified electrodes. They respond linearly to chloramphenicol (CAP) in the range from 2.5 to 50 μ M. Furthermore, they display am excellent long-term stability, reproducibility, and good selectivity, as well as their capacity of detecting CAP in the real milk sample.
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