Study Of Polymer Modification Of Carbon Nanotubes And Its Electrochemical Properties

Polyvinylpyrrolidone (PVP)-Multi-wall carbon nanotubes (MWNT) composite material was prepared in N-vinyl pyrrolidone (NVP) solution containing MWNT by ultrasonic radiation, and the electrochemical properties of ascorbic acid (AA) on PVP-MWNT modified glassy carbon electrode (GCE) were investigated. The nanocomposites were characterized by TG,TEM,IR and UV-Vis.The results showed that the weight of MWNT was increased by27%after modification,coating of PVP on the surface of the MWNT was uniform,the length of MWNT became shorter significantly because of ultrasonic.Compared to the bare electrode,a pair of weak redox peaks were obtained about AA on MWNT modified electrode,however,the peaks were sharp and reversible on the PVP-MWNT/GCE.The oxidation peak current of AA versus its concentration exhibited a good linear relationship in a concentration range of1.0x10-7-1.0x10-3mol/L.The linear regression equation is Ip=8.659+0.767xlgC,and R=0.9988,SD=0.066.