Synthesis of gold nanocubes/PEI-wrinkled CoSe2 nanomaterials and its application in electrochemical immunosensors for detection of dipropyl phthalate

• 作者: Bao-Shan He Jia-Wen Li
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1099-1109
• 页数: 11页
• 语种: 英文

摘要

CoSe2 nanosheet materials with a wrinkled sheet structure and large surface area were synthesized via a simple hydrothermal method.Then poly-ethyleneimine(PEI)was used to functionalize wrinkled CoSe2(w-CoSe2)to make gold nanocubes(AuNCs)uniformly anchored onto the surface of PEI-w-CoSe2 via Au-N bonds.And its application in electrochemical immunosensors for the detection of dipropyl phthalate(DPrP)was studied.The obtained material was charac-terized by the Fourier transform infrared spectroscopy(FTIR),transmission electron microscope(TEM),energy-dispersive spectroscopy(EDS),X-ray diffraction(XRD)and Raman spectroscopy.The effective surface area and conductivity of the electrode were enhanced by the introduction of AuNCs/PEI-w-CoSe2 nanocomposite.Cyclic voltammetry(CV),differential pulse voltammetry(DPV)and electrochemical impedance spectroscopy(EIS)were used to characterize the performance of immunosensor.After DPrP binds to antibodies via the antigen-antibody interaction,[Fe(CN)6]3-/4-was used as a signal probe to monitor the change of oxidation current of different DPrP concentrations.Under optimal condi-tions,the electrochemical responses of the prepared immunosensor were linear when the DPrP concentrations ranged from 1×10-11 to 1×10-5 mol·L-1,with a detection limit of 1.39×10-12 mol·L-1.The coefficient of determination(R2)is 0.995,indicating that the degree of fitting is good.Besides,the constructed immunosensor exhibited acceptable reproducibility,selectivity,and sta-bility.Therefore,it may be found that the composite material has good application prospects in the electro-chemical sensors field.