Preparation And Electrochemical Application Of Polymerized Cyclodextrin / Noble Metal Nanoparticles Functionalized Graphene Composites

1β-Cyclodextrin and P-Cyclodextrin polymer functionalized graphene:Apply to the electrochemical determination of imidaclopridReduced-graphene oxide (rGO) modified with water-solublep-cyclodextrin (β-CD) and (3-cyclodextrin polymer (β-CDP) was successfully prepared by using a simple wet chemical strategy. These new materials had been characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), static contact angle measurementand and electrochemical impedance spectroscopy (EIS), the results indicated that β-CD and β-CDP molecules had been successfully loaded on the surface of Reduced-graphene. β-CDP/rGO and β-CDP/rGO nanophase materials have displayed excellent water-dispersity and stability. More significantly, the rusults of differential pulse voltammetry measurement and cyclic voltammetry indicated that the β-CD/rGO and β-CDP/rGO could show high supramolecular recognition and enrichment capability for imidacloprid(IDP). Compared with various of other modified electrodes, β-CD/rGO and β-CDP/rGO modified electrode showed more excellent electrochemical performance for imidacloprid. Based on the cyclic voltammograms (CV) of different concentration of IDP at pH6.8, detection line range of IDP determinated by β-CD/rGO modified electrode is5×10-6to3×10-4mol L-1IDP and the detection limit is5×10-7mol L-1,5×10-6to3x10-4mol L-1and1×10-7mol L-1for β-CDP/rGO modified electrode. The result of differential pulse voltammetry (DPV) measurement on β-CDP/rGO modified electrode showed that the reduction peak current increased linearly with the concentration of IDP,the linear range is5×10-8to1.5×10-5mol L-1and2×10-5to1.5×10-4mol L-1respectively,the detection limit of2×10-8mol L-1.2Gold nanoparticles self-assembling onto functionalized reduced graphene and apply to electrocatalytic oxygen reduction reactionIn this paper, we have studied the electrocatalytic oxygen reduction reaction on AuNPs/pATP-β-CDP/rGO nanocomposites modified electrode. Inclusion complexes between β-CDP and pATP were modified onto the surface of rGO through non-covalent bond force. Pre-prepared AuNPs could self-assemble onto the surface of pATP-(3-CDP/rGO through thiol and amido groups of pATP to obtain AuNPs/pATP-P-CDP/rGO hybrid materials. It was verified that AuNPs could be uniformly scattered on rGO and the amount of AuNPs modified on rGO could be adjusted by changing the weight ratio of pATP-β-CDP/rGO. Cyclic voltammograms show that the peak current on AuNPs/pATP-β-CDP/rGO/GCE remarkably increases in O2-saturated0.1M H2SO4solutions. The electrocatalytic activity of AuNPs/pATP-β-CDP/rGO for oxygen reduction reaction (ORR) is highly tunable by adjusting the amount of AuNPs on the rGO.3Platinum nanoworms self-assemble onto reduced graphene as enhanced catalyst for oxidation of methanolA noble Pt nanoworms (PtNWs)/p-aminothiophenol (pATP)-β-cyclodextrin polymer (β-CDP)/reduced graphene oxide (PtNWs/pATP-β-CDP/rGO) nanocomposite is synthesized using the self-assembly strategy. Inclusion complexes between β-CDP and pATP are modified onto the surface of rGO through non-covalent bond force. Then, pre-prepared PtNWs self-assemble onto the surface of pATP-β-CDP/rGO through thiol and amino groups of pATP to form PtNWs/pATP-β-CDP/rGO hybrid materials. It is verified that the PtNWs may be uniformly scattered on rGO and the amount of PtNWs may be adjusted changing the weight ratio of pATP-β-CDP:rGO. Cyclic voltammograms show that the PtNWs/pATP-β-CDP/rGO catalysts have higher active surface area and more improved performance towards the electrocatalytic oxidation of methanol than those of commercial Pt/C catalysts. Furthermore, the PtNWs/pATP-β-CDP/rGO catalysts exhibit the excellent stability through long-term cycle stability testing. The proposed synthesis strategy will provide a facile, feasible and effective method for methanol oxidation reaction.