Preliminary Study On The Applications And Preparation Of Diamond-like Carbon Films

Considerable research has involved development and characterization of new carbon-based thin-films, especially Diamond-like Carbon film. Since it was reported for the first time in 70's last century, Diamond-like Carbon film has drawn much attention due to its advantageous properties. Many research groups all round the world are exploring its latent applied value combining the special features of their own.Diamond-like Carbon film possesses several advantageous properties including extreme hardness, low friction factor, optical transparency, chemical inertness, higher electron mobility. The research contents of this thesis mainly is pilot study on the applications of Diamond-like Carbon films in SERS and electroanalytical chemistry according to good optical transparency chemistry stability and electrical conductivity of diamond carbon film. Detailed content have been divided into three parts in this thesis.1. Preparation and characterization of Diamond-like Carbon films.Carbon films differ significantly as regards such electrochemical properties as potential window, capacitance, conductivity, and stability as a result of the different deposition procedures. So I introduce chemical evaporation disposition, the method for the preparation of thin-film carbon films at the beginning of the paper. The surface structure and morphology of the prepared film were characterized by atomic force microscopy (AFM), Raman scattering spectroscopy and X-ray photoelectron spectroscopy (XPS). The results indicated that Diamond-like Carbon film possesses ultraflat surface and contains a significant fraction of sp3 bonds; substrate-to-target distance shows a great effect on the thickness of Diamond-like Carbon film, the thickness of coatings is decreased obviously with the increase of substrate-to-target distance. The dominant factors causing the effect of substrate-to-target distance on the thickness of coating are the distribution of magnetic field in the working chamber and the gaseous particle scattering collision during their movement.2. Preliminary study on the applications of Diamond-like Carbon films in SERS.At present, more attention has been paid to the fabrication of metal-doped Diamond-like Carbon films. The influence of the metals on the properties of Diamond-like Carbon films vary to metal-doped DLC films with different metal. The development of the method for the preparation is very important to extend the range of available applications of the DLC. In the paper, Ag-doped Diamond-like Carbon film have been synthesized by the electroless process, and the results showed that the resulting substrates chemisorbed with the analyte(4-ATP)exhibit enhanced Raman signals. For the vibrational modes at 1390cm-1(b2) and 1078cm-1(a1), EFs of 5.46×109 and 8.2×104 were obtained, respectively. Therefore, the SERS enhancement of our samples comes from both CM and EM effects. The Raman enhancements of Ag-doped Diamond-like Carbon film SERS substrate is much higher compared to that from Ag Mirror. It is possible that gold–carbon interaction in the nanocomposite film may bring about such properties.3. Preliminary Study on the Applications of Diamond-like Carbon films in electronalytical chemistry.Carbon materials have been widely used in electroanalysis, because they have a number of advantageous properties. The development of new carbon-based, thin-film electrodes is very important to electroanalysis. Diamond-like Carbon Films as electrode materials has low resistivity and has achieved a wide potential window and active charge-transfer properties. Carbon materials have been commonly employed in electroanalysis, electrocatalysis and electrosynthesis, especially for biological sensing.We prepare Diamond-like Carbon film electrode by chemical evaporation disposition. The surface structure and morphology and electrochemical characterization of the prepared electrode were characterized. The results show that Diamond-like Carbon Film as electrode material has low resistivity and has achieved a wide potential window and active charge-transfer properties. Finally, we determinate trace azide ion by Diamond-like Carbon Film electrode.In conclusion, the research contents of this thesis is just about pilot study on the applications of Diamond-like Carbon films in SERS and electroanalytical chemistry, but Diamond-like Carbon films with advantageous properties must have more potential application in electroanalysis, electrocatalysis and electrosynthesis, especially for biological sensing. Therefore, the development of the method for the preparation is very important to extend the range of available applications of the DLC. And point out; with the developing of the technology of the DLC, it will exploit the particular advantages in more and more fields.