The Spectral Characteristics Of The Single-walled Carbon Nanotubes And Other Fullerene Nanomaterials

With remarkable mechanical and electronic properties, single-walled carbon nanotubes (SWCNTs) can be explored to be used in novel applications and become a hotspot of studies on nano material. Since the discovery of it in 1991, a lot of works about SWCNTs synthesis and structure check have been done.Since the discovery of C₆₀ molecule in 1985 by Kroto, Smalley and etc, with its ideal symmetry, unique physical and chemical properties, it has opened a new research filed for scientists in optics, semiconductor and superconduct micro-electronics. In recent years, the properties of C₆₀ have been extensively studied by scientists.With narrow bands, Raman spectroscopy has advantages for probing molecular structures, and has been proved to be a useful tool to analyze the structure of SWCNTs and the adsorption behavior of C₆₀ fullerene materials. However, the information it provided is limited by its low sensitivity. Surface-enhanced Raman Scattering (SERS) has high sensitivity and resolution, which has been used as a powerful technique for providing high-quality spectra exhibiting fine structural details of molecules. Using SERS for studying CNTs and C₆₀ fullerene materials, high quality spectra have been observed and more structural details of CNTs and the property of C₆₀ films have been obtained.The following are the main results obtained in this paper:1. Synthesis SWCNTs use Mo, Ni as catalysts. By studying the TEM and Raman spectra of products obtained at different temperature, we found that the best synthesis temperature is 850℃.2. A roughed silver electrode modified with Au/Ag nanoparticles is used as a substrate, on which high quality SERS of SWCNTs are obtained. Not only all Raman bands of SWCNTs in normal Raman scattering have been generally enhanced, but also some new bands can be observed. Within 1100–1500 cm?1, a series new bans that characterize the structure of SWCNTs and the interaction between SWCNTs and the metal nanoparticles were observed. We can also get the same result on the silver modified silver electrode. The experimental and theoretical analysis shows that this method can be used as a probe technique for monitoring the synthesis quality of SWCNTs and researching the interaction between SWCNTs and Au/Ag nanoparticles. 3. From the comparison of the SERS of the out-of-order and the inerratic C₆₀ films in"gold nano-particles/ C₆₀ /gold film"system, we can see that the vibrational structure and the adsorption behavior are different when C₆₀ organized as different kinds of films, so this ternary system is very effective and active. It provides convenience for probing the C₆₀ vibrational structure, the physical properties, adsorption behavior and the interaction between fullerene and gold particles. It provides a new method for research the property of C₆₀ films.4. Using thermal decomposition method, we get pure silver film on the surface of ITO. This method can not only exclude the influences from the solvent, but also adjust the dimension of the silver film freely. We use p-hydroxybenzoic acid (PHBA) molecule as probe molecule to investigate the SERS activity of this substrate. High quality SERS spectrum of PHBAon the silver-coated ITO and in the"silver nano-particles/PHBA/silver-coated ITO"were obtained. The experimental results show that this method can be used to investigate the vibrational structure, physical properties, adsorption behavior and the interaction between adsorbate and substrate surface. This substrate can be used to investigate the SERS spectrum of SWCNTs and C₆₀ fullerene materials.