Application Of Graphene Oxide And Carbon Nanotube Modified Electrode In Electroanalytical Chemistry

The electroanalytical chemistry, as one of the analytic methods, can determine the signal which comes from the redox process of detected systems and compounds. Some physical parameters, for example, the current, potential, electric quantity and conductance, are successfully achieved to receive a series of information which is speculated the character and the concentration of the samples. Hence, it is widely used in several crucial fields which contain the food industry, the pharmacy, environmental monitoring, life sciences and new energy, due to the excellent character.As one of the significant part of the electrochemistry, the modified electrodes have largely attracted attention of the investigators. Some opportunities and challenges appear with the development of the methods and the new-style material. The graphene oxide and the single-walled carbon nanotube possess the special space structure, the outstanding absorbability and the wonderful electrocatalysis, so it can be utilized as the novel material to modify the electrodes. Subsequently, we study the properties of them as follows:Firstly, the GO/GCE was fabricated to determine the o-nitrophenol accurately. All of the experiment conditions were optimized appropriately before detecting. The results showed that the modified electrode held the evident electrocatalysis, so the linearity range was broader as1×10-7mol L-1to1.2×10-4mol L-1and the detectability was lower as0.03μmol L’1compared the methods reported.Secondly, a newfashioned modified electrode was manufactured in order to prove the influence of other nitrophenols by detecting them simultaneously. The results showed that the divided potentials were satisfactory with Eo-m=201mV、 Eo-p=376mV and Em-p=166mV by cyclic voltammetry in HAC-NaAC buffer solution of pH5.6.Finally, the graphene oxide has less electrical conductivity than graphene due to the demolishment of the polyatomic. So it was essentially to produce a modified electrode to justify the effect of degree. The quercetin possessed a reductive peak at0.12V, while the reductive peak of the rutin was in0.51V, the divided potential was0.39V. in GO/IL/GCE.