Preparation And Electrochemical Applications Of Phenylboronic Acid Functionalized Polypyrrole/Graphene Oxide Nanocomposites

Graphene nanosheets have an ideal electrical conductivity,a stable two-dimensional structure and a high aspect ratio.The surface of graphene oxide(GO)has many functional groups and many active sites,and it is easy to be functionalized or compounded with other materials,which greatly expands the application of graphene.However,its electrical conductivity is greatly reduced since GO surface contains a large number of functional groups.So,the direct application in electrochemical sensors is limited by high resistance groups such as carboxyl,hydroxyl,and the like.In recent years,researchers had increasingly studied about GO and its derivatives,graphene modified materials are widely used in many fields.Recently,conductive polymer polypyrrole/graphene oxide(PPy/GO)nanosheets have been successfully prepared,making the material's performance of conductivity and specific surface area overall improved,but poor water solubility constrains its applications in biosensors and electrocatalysis and other fields.Phenylboronic acid has a specific recognition ability,can react with cis-diol to form a stable cyclic ester under alkaline conditions,so it has a important research significance in the field of electrochemical sensors.In this paper,we successfully prepared P4VPBA/PPy/GO composite nanomaterials by polymerization of double bond modified PPy/GO and 4-vinylbenzeneboronic acid.The composite nanosheets have better two-dimensional structure and aspect ratio.Because of its superior properties in specific surface,electronic conductivity and recognition capability,it can be applied to the construction of electrochemical sensors.Due to the specific binding of phenylboronic acid compounds and 1,2-diols,the composites and phenylboronic acid groups have a excellent specific recognition and detection properties during the electrochemical detection of catechol(CC)and hydroquinone(HQ).The phenylboronic acid group can selectively react with CC to form a stable cyclic ester under alkaline conditions.Therefore,P4VPBA/PPy/GO composite nanomaterials on simultaneous detection of HQ and CC shows good stability and high sensitivity.At the same time,the presence of a large potential difference is sufficient to achieve simultaneous detection of these two dihydroxybenzene isomers in the mixture.Therefore,P4VPBA/PPy/GO nanosheets are a good electrode material for the electrochemical detection of CC and HQ.Secondly,we introduce the phenylboronic acid(PBA)groups into the imidazole-type polymeric ionic liquids(PILs)to synthesize PIL-modified polypyrrole/graphene oxide composites containing PBA,namely P(4VMIB-PBA)/PPy/GO nanosheets.It has greatly advantages in electron transport capability,specific surface area,hydrophilicity,and electrochemical identification properties.The introduction of PILs containing PBA enhances the water solubility of the material and optimizes the electron transport mode.The presence of PILs on the surface of P(4VMIB-PBA)/PPy/GO can effectively promote the electron transport ability of the modified electrode surface.At the same time,because of the PBA group has the specific ability to recognize and detect dopamine(DA),P(4VMIB-PBA)/PPy/GO nanosheets applied to the electrochemical detection of Acetaminophen(AC)and DA show good electrocatalytic properties,a large potential difference,a excellent sensitivity and stability.Therefore,we can use P(4VMIB-PBA)/PPy/GO nanosheets as a good electrode material for high-efficiency and sensitive detection of AC and DA.