| With the gradual improvement of the socio-economic level,and the steady development of industrial level,the special material testing in various environment becomes a necessary part of it.Boron-doped diamond films have a high mechanical strength,chemical stability and good electrochemical performance,even in the high-intensity current,the electrode surface will not change significantly.Also it has a wide potential window and lower electrochemical background current.This makes the electrode can work in special circumstances,besides good electrode conductivity.Finally,through the electrochemical treatment,certain specific material can be tested,and it can fully replace the existing sensors and use more times and more longer with higher sensitivity and higher efficiency.At present,the boron-doped diamond electrodes is used in the application of sewage treatment with a greater effectiveness.In testing period it was still in the window period.By using boron-doped diamond thin film electrode on the detection of ascorbic acid,it has a detection limit as 6.4×10-6.In the concentration of 8.0×10-6 to 3.1×10-4,they have a good linear relationship between concentration and the peak current:I(A)=7.05C(mol/L) +2.28×10-4,with correlation coefficient:0.978.Next,application covalent bonding method in the environment of dilute nitric acid,with the support of ultraviolet radiation,we succeed modified the ferrocene on boron-doped diamond thin film electrode surface.Modified electrode in the detection of ascorbic acid,have a better detection limit and the linear range. The detection limit is 6.2×10-8mol/L.In the concentration of 1.0×10-7 tO 5.0×10-4,we get I(A)=190.7C(mol/L)+1.07×10-4 after fitting,and the correlation coefficient is 0.9800 Modified electrode performance has been greatly improved on sensitivity,selectivity, reproducibility and repeatability.Also,it inherited the diamond electrodes' excellent stability, potential window width,low current background characteristics.This makes the electrode has a broader application of space and better prospects.At the same time,we committed to improving the boron-doped diamond thin film electrode preparation technology and processing improvement,for better preparation of a higher quality diamond electrodes.Using hot filament CVD method,after many years of practice,under certain circumstances,we need only five hours on a good quality product.That guarantee the accuracy of the experimental results and effectiveness for the realization and has also played a great role in universal testing application.
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