Studies On The Application Of CNTs/nanoAu Film Modified Electrode In Chemical Analysis

In recent decades, with the chemists at the nano-materials research in the field of microcosmic in-depth,a growing number of nano-materials are widely used in analytical chemistry. Electroanalytical chemistry as a branch of analytical chemistry becomes a research hotspot in recent years because of its easy operation, high sensitivity, fast response, low cost and other advantages. The introduction of nano-materials, the field of electroanalytical chemistry, particularly chemical sensors, you can significantly improve the sensor sensitivity, selectivity and reproducibility. Chemical sensors modified with nano-materials, have become the development trend of the future sensor and they has great potential application value.In this paper, a combination of nano-gold and multi-walled carbon nanotubes of small size effect, surface effect and macroscopic quantum tunneling effect shown by the special physical and chemical properties, with good dispersion and stability of the chitosan and cetyl- trimethylammonium bromide as a dispersing agent respectively prepared nanoAu-MWNTs-CS-GC,nanoAu-MWNTs-CTAB-GC sensors and were characterized by electrochemical methods and applied research results are as follows:Based on NanoAu-MWNTs-CS composite materials modified electrochemical sensors for plant hormone indole acetic acid has a good catalytic performance, experimental results show that: In the concentration range of 5 ~ 200μmol/L, the optimal conditions, using cyclic voltammetry (CV) measured changes in the oxidation peak current value and c (IAA) ,its showed a good linear relationship between them. The regression equation is: y= 2.34×10-4 +0.14x,the detection limits is8.33×10-8mol/L,R=0.9997. And compared to the past indole acetic acid sensor, it has a high sensitivity and good stability.Characterizationof nanoAu-MWNTs-CTAB-GC electrode by electrochemical method showed that gold nanoparticles/ carbon nanotubes composite electrodes can effectively improve the electron transfer rate. Levofloxacin was catalyticly studied in supporting electrolyte solution, PH, MWNTs/CTAB ratio. Experiments show that in the pH = 3 PBS ,0.5mg / L MWNTs, 2mg / L CTAB composite film modified electrode under the catalytic levofloxacin to achieve the best results. Peak current and the concentration of levofloxacin in 7.2×10-7 ~ 10-3mol / L showed a good linear relationship ,the detection limit of 3.6×10-8mol / L.