Synthesis of gold nanocubes/PEI-wrinkled CoSe 2 nanomaterials and its application in electrochemical immunosensors for d
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Synthesis of gold nanocubes/PEI-wrinkled CoSe2 nanomaterials and its application in electrochemical immunosensors for detection of dipropyl phthalate Bao-Shan He*
, Jia-Wen Li
Received: 9 June 2020 / Revised: 12 July 2020 / Accepted: 22 August 2020 Ó GRINM Bohan (Beijing) Publishing Co., Ltd 2020
Abstract CoSe2 nanosheet materials with a wrinkled sheet structure and large surface area were synthesized via a simple hydrothermal method. Then polyethyleneimine (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 characterized by the Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), energydispersive 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 conditions, the electrochemical responses of the prepared immunosensor were linear when the DPrP concentrations ranged from 1 9 10-11 to 1 9 10-5 molL-1, with a detection limit of 1.39 9 10-12 molL-1. The coefficient of determination (R2) is 0.995, indicating that the degree Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12598-020-01580-5) contains supplementary material, which is available to authorized users. B.-S. He*, J.-W. Li School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, China e-mail: [email protected]
of fitting is good. Besides, the constructed immunosensor exhibited acceptable reproducibility, selectivity, and stability. Therefore, it may be found that the composite material has good application prospects in the electrochemical sensors field. Keywords CoSe2 nanosheets; Polyethyleneimine; Gold nanocubes; Dipropyl phthalate
1 Introduction Two-dimension (2D) transition metal dichalcogenides (TMDs) with the molecular formula of MX2 (where M = Mo, W or Co and X = Se or S) [1] have been considered as promising nanomaterial due to their fantastic electronic and physical properties [2]. Cobalt-based materials have attracted widespread attention on account of metallic Co’s surprising 3d electronic configuration [3]. As the typical representatives of transition metal dichalcogenides in the field of nanomaterial, cobalt diselenide (CoSe2) has been widely applied in energy storage and conversions [4, 5], such as electrocatalysis [6], photocatalysis [7], supercapacitor
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