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Functionalized quantum dots have been successfully attached to multi-walled carbon nanotubes over carbodiimide-assisted coupling. Characterization in a transmission electron microscope shows the quantum dots are attached mainly at the opened tips and defect sites on the side-walls of nanotubes, suggesting the covalent nature of the bonding and high selectivity to chemically reactive sites. Due to...
In order to improve the performance of field emitters nowadays, carbon nanotubes are used instead of conventional materials such as silicon and metals. In this paper, field emission characteristics of three different multi-wall carbon nanotube films have been compared, which are fabricated by different methods, including direct growth, evaporation coating and flow assembly. The field emission current-voltage...
The pyrolyzed polyaniline (PANI) consisted of amorphous hard carbon full of pores. Carbon nanotubes (CNTs) grew on pyrolyzed PANI substrate with the rough surface containing some pores using a low pressure chemistry vapor deposition (LPCVD) method with xylene as a carbon precursor source and Fe/SiO2 nanoparticles as catalyst. The pore extrusion and the deposited carbon particles adhesion of CNTs growing...
Various sensing characteristic of carbon nanotube synthesized by low press chemical vapor deposit (LPCVD) method have been studied. The composite sensing film of silicon dioxide and multi-wall nanotubes (SiO 2-MWNTs) is sensitive to methane. The various characteristic such as sensitivity, repeatability, reliability and cross-sensitivity of SiO2-MWNTs composite film gas sensor have been studied. Having...
A novel room temperature synthesis of carbon nanotubes (CNTs) by liquid phase deposition of methanol is firstly reported. Nanotube samples were characterized with field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and Raman spectroscopy. FESEM micrographs revealed that nanotubes with diameter in the range of 20-200 nm were grown at room temperature. HR-TEM...
High yields of multi-walled carbon nanotubes are synthesized by chemical vapor deposition of acetylene on palladium nanoparticles supported on porous SiO2. HRTEM results reveal that the carbon nanotubes have novel conical inner structure. By changing the content of palladium in the catalyst, we obtained palladium nanoparticles with different diameter distribution. It was found that the apex angles...
Field emission properties of carbon nanotubes (CNTs) filled with single crystalline Cu nanoneedles at their tips have been investigated in situ with an STM-TEM holder. The CNTs are synthesized using an alkali doped Cu catalyst by a thermal chemical vapor deposition method. Experiments show that CNTs filled with Cu have a much lower turn-on voltage (generally lower than 75V) than those without Cu (>...
In this paper, the multiwall carbon nanotubes were opened and then filled with Cu and Ag materials. Several kinds of carbon nanotubes/epoxy composites were prepared by melt mixing epoxy resin and the nanotubers mentioned above. The dielectric properties of the composites were investigated at room temperature. Experimental results showed that the dielectric properties of the MWNTs/epoxy composites...
The carbon nanotube film is grown by low press chemical vapor deposit (LPCVD) method after catalyst grains are introduced with ferro hydroxid sol. The variation of the concentration of catalyst grains versus the surface morphology of carbon nanotube film has been studied. When the distance between two nanotubes is from 200 nm to 500 nm, the threshold electric voltage is around 95 V for the best result...
In this study we predict the frequency modulation atomic force microscopy (FM-AFM) subatomic frequency shift images of a Si (001) surface using empirical potential molecular dynamic methods. We model carbon single-wall nanotube caped tip and Si (001) surface to investigate the tip-surface interaction. The simulation shows that the FM-AFM imaging force mainly comes from C-Si/C-C chemical covalent bonding...
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