Preparation Of Three-dimensional Graphene/carbon Nanotubes And Its Application In Electrochemical Analysis

In this paper,three-dimensional graphene/carbon nanotubes?3D G/CNT?were used to improve the performance of electrochemical sensors.The advantages of electrochemistry,such as simple operation,fast response,high sensitivity and high selectivity,were utilized to detect quinolone?OLA?organic antimicrobial environmental pollutants quickly and sensitively.A novel electrochemical sensor based on 3D G/CNT material was prepared by proper functionalization of ionic liquids?IL?and applied to the detection of sulfachlorpyridazine?SCP?.the main contents are as follows:?1?To prepare graphene with good dispersion,graphene oxide was prepared by improved Hummer's method,and graphene was synthesized by reduction.The covalent C-C bonded 3D G/CNT hybrids were synthesized by catalytic chemical vapor deposition?CVD?.In order to construct a stable sensor electrode material,a novel composite material was prepared by simple grinding and ultrasonic dispersion,Adding Poly?dimethyldiallylammonium chloride??PDDA?and Nafion functionalized 3D G/CNT.?2?Using the prepared graphene,carbon nanotubes,3D G/CNT hybrid material to modify the glassy carbon electrode to construct an electrochemical sensor,using differential pulse voltammetry?DPV?to study and compare olaquindox in Electrochemical behavior on three modified electrodes.3D G/CNT hybrid material modified glassy carbon electrode was used to construct an electrochemical sensor.Cyclic voltammetry?CV?and differential pulse voltammetry?DPV?were used to study the electrochemical behavior of olaquindox on the modified electrode.The results showed that when the pH was 7.5,the olaquindox concentration range was 1.5×10^-62.7×10^-3mg/mL,and the linear relationship was good.The linear regression equation was:ip=5.152c+1.225?R=0.9903?.The detection limit?3Q?of this method is estimated to be approximately 6.12×10^-88 mg/mL.In order to prove the practicability of the method,the actual pig urine sample was spiked and recovered using this method,and the sample recovery rate was between 97.79%and 104.25%.?3?A three-dimensional graphene/carbon nanotubes/ionic liquids?3D G/CNT/IL?modified glassy carbon electrode was used to construct an electrochemical sensor and study the electrochemical behavior of sulfachlorpyridazine on the modified electrode.At pH 6.5,the sulfachloropyrazine concentration range was measured from 0.02?M to 12?M with good linearity.The linear regression equation was:ip=0.2890c-4.061?R=0.9913?.The detection limit?3Q?of this method is estimated to be approximately 0.018?M.It releved that the method has high selectivity,great accuracy and good sensitivity.The electrochemical sensor constructed with this new material has a broader prospect in the detection of organic pollutants and has great potential in monitoring animal products and food safety applications.