In situ decoration of Au nanoparticles on carbon nitride using a single-source precursor and its application for the detection of tetracycline
Hua Guo a,b , Ya Su a,b , Yanling Shen a,b , Yumei Long a,b,c,*（龙玉梅）, Weifeng Li a,*（李伟峰）
a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, PR China
b The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, PR China
c State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR ChinaRoad, Suzhou 215123, P. R. China
Journal of Colloid and Interface Science 536 (2019) 646--654
Optimizing heterostructure of nanocomposites holds great potential for making full use of their ability. Herein, gold nanoparticles (AuNPs) were in situ synthesized over the surface of graphitic carbon nitride (g-C3N4) via one-step pyrolyzation route using a single source precursor. The precursor of melamine chloroauric (C3H6N6H+⋅AuCl4−) was obtained through chemical precipitation reaction between melamine and chloroauric acid. The morphological analysis confirmed the compact contact between Au nanoparticles and g-C3N4. Then, the Au-g-C3N4 nanocomposites were employed to fabricate electrochemical sensor by modifying glassy carbon electrode (GCE). Electrochemical experiments showed that the Au-g-C3N4 exhibited enhanced electrocatalytic activity towards tetracycline oxidation as compared with either pure g-C3N4 or Au nanoparticles. Based on cyclic voltammetry (CV) method, the sensor was applied in the detection of tetracycline with a low detection limit of 0.03 μM (S/N = 3) and the linear range of concentration were 0.1–20 μM and 20–200 μM, respectively. Moreover, such an electrochemical sensor demonstrated high stability and good selectivity. Finally, the electrochemical sensor was applied to drug assays and exhibited sufficient precision and accuracy. Therefore, this work paves a new way of preparing g-C3N4–based heterostructures and provides an efficient method for the detection of tetracycline in clinical analysis and quality control.
链接：https://www.sciencedirect.com/science/article/pii/S0021979718313018?via%3Dihub
