Preparation And Application Of The Grown In Situ Carbon Nanotube Chemically Modified Electrode

In this thesis, the grown in situ carbon nanotube chemically modified electrode (GSCNT-CME) was prepared and applied in the field of electrochemical detection. The main researches are as follows:(1)The GSCNT-CME was prepared by the in situ growth of carbon nanotube (CNT) onto a pretreated graphite electrode (GE) via catalytic chemical vapor deposition. The pretreated GE was prepared by direct current electrochemical deposition using a nickel catalyst. The deposited nickel and the obtained GSCNT-CME were characterized by optical microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray diffraction (EDX). The electrochemical performance of the obtained GSCNT-CMEs were characterized by cyclic voltammetry (CV) using the [Fe(CN)6]3-/[Fe(CN)6]4- solution. Results showed that there was a layer of nickel on the pretreated GE surface after direct current electrochemical deposition and CNT with uniform tube diameters were present on the surface of the GE. The prepared GSCNT-CME has good current response sensitivity and good accuracy. It may be applied in electrochemical testing field.(2)The GSCNT-CME was prepared by growing carbon nanotube (CNT) in situ on the pretreated graphite electrode (GE) via a liquid ethanol flame. The pretreated GE was prepared by direct current electrochemical deposition nickel catalyst. The deposited nickel catalyst and the obtained GSCNT-CME were characterized by X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM), respectively. The electrochemical performances of the obtained GSCNT-CME were characterized by cyclic voltammetry using the [Fe(CN)6]3-/[Fe(CN)6]4- solution. The results showed that the deposited Ni catalyst was (111) crystal face mostly. And the carbon nanotube with the diameter of about 40 nm was evenly grown on the GE surface. The prepared GSCNT-CME had good current responsive sensitivity and good testing result accuracy. Moreover, the method to prepare the GSCNT-CME was very simple and effective. All these indicated that the flame synthesis to prepare the GSCNT-CME would be good applied in electrochemical testing field. (3)The GSCNT-CME prepared by growing carbon nanotube (CNT) in situ on the pretreated graphite electrode (GE) via a liquid ethanol flame, and was applied to the detection of trace copper. By cyclic voltammetry tested found:in the scan range of-300-300m V, the two relationships of the scanning rate square root and the oxidation peak current and the redox voltage difference are both excellent linear. The oxidation peak current and Cu2+ had a good linear relationship in the concentration scope of 3.0×10-6 mol/L-1.0×10-4 mol/L, the correlation of linear equations was Ipk=0.29+0.163C (C×10-5 mol/L), the linear correlation coefficient was 0.9993, the detection limit was 1.0×10-6 mol/L. The results show that, the GSCNT-CME used to test Cu2+ has good electrochemical detection sensitivity and accuracy, and can be used for the detection of trace copper.