The Preparation And Application In Electrochemical Sensor Of Three-Dimensional Graphene/Urushiol Composites With Hierarchical Structure

This article summarizes the structure,properties,preparation methods of graphene and its 3D build and functional modification.From the idea of molecular design,we use urushiol with special chemical structure and chemical activity as reducing agent and modifier of graphene oxide,and its thermal polymerization and the chelation coordination ability of active phenolic hydroxyl.Through the simple regulation of the construct method,realizes the controllable preparation and functional modification of the three-dimensional graphene composites.The research contents of this article are as follows:(1)The 3D-PU-rGA-N was successful constructed by solvethennal method,used the urushiol to reduce and modify of GO,and the urea as nitrogen source.The research shows that the specific surface is 407.61m2·g-1 of the three-dimensional porous graphene composite aerogel.The modified electrode has excellent electrochemical activity under the synergistic effect of the high surface area and high conductivity of N-doped activated graphene.In the concentration range of 5×10-6 to 5×10-4M,the detection limits of catechol and hydroquinone were 1.2×10-6M and 3.1×0-6M(S/N=3)respectively,which the electrochemical sensor also has a good stability,reproducibility and anti-interference.(2)Using the 3D-PU-rGA-N as carriers,the MnFe2O4 nanoparticles were uniform grown in graphene sheet by the coordination interaction of urushiol with metal ions,and the N-doped activated 3D graphene/polymer urushiol/MnFe2O4 nanoparticles aerogel(3D-PU-rGA-N/MnFe2O4)was successful prepared.The research shows that the modified electrode has excellent electrochemical activity under the synergistic effect of the large specific surface area and high conductivity of the N-doped activated graphene and the high catalytic ability of MnFe2O4 nanoparticles.In the concentration range of 5?M to 0.1mM,the concentration of p-nitrophenol(4-NP)was linear with the oxidation peak signal,and the detection limit of p-aminophenol(4-NP)was 4.5×10-7M(S/N=3),which has a good stability,reproducibility and anti-interference.(3)The 3D-MnFe2O4/GO composite membrane that loaded MnFe2O4 nanoparticles was growth on the ethylenediamine-functionalized ITO substrate by self-assembly method.Using the ability of urushiol to reduce graphene oxide and in-situ thermal polymerization of urushiol grafted on graphene oxide,the three-dimensional porous structure of graphene composite membrane electrode loaded MnFe2O4 nanoparticles(3D-MnFe2O4-rGO-U/EDA/ITO)was successfully formed in solvethermal system.The research shows that the three-dimensional graphene composite membrane ITO electrode has excellent electrochemical activity under the synergistic effect of the three-dimensional porous structure and the catalytic ability of the MnFe2O4 nanoparticles.In the concentration range of 40 to 400?M,the H2O2 concentration was linear with the response signal,the detection limit was 1.5×10-5M(S/N=3),which the electrochemical sensor also has a good stability,reproducibility and anti-interference.