Diameter and morphology control of SWNTs by alcohol CVD
نویسندگان
چکیده
The concentration of Co-Mo binary catalyst concentration and the effect on the morphology of single-walled carbon nanotubes (SWNT) was investigated by scanning electron microscopy and optical spectroscopy. We found that there is some critical concentration or catalyst density below which SWNTs will not be vertically aligned. Higher Mo concentrations resulted in vertically aligned, small-diameter SWNTs.
منابع مشابه
Diameter Controlled CVD Synthesis of Single-Walled Carbon Nanotubes
In this study, we systematically investigated the influence of catalyst preparation procedures on the mean diameter of single-walled carbon nanotubes (SWNTs) synthesized by the alcohol catalytic chemical vapor deposition (ACCVD) process. It was found that the SWNT diameter is dependent upon both reduction temperature and time, with lower reduction temperature and/or shorter reduction time resul...
متن کاملOptical Characterization of Single-Walled Carbon Nanotubes Synthesized by Catalytic Decomposition of Alcohol
The single-walled carbon nanotubes (SWNTs) synthesized by a catalytic decomposition of alcohol (Alcohol CVD method, ACCVD) are compared with HiPco SWNTs sample through optical spectroscopic measurements such as resonant Raman scattering, optical absorption and near infrared fluorescence. By ACCVD method, SWNTs were synthesized either on zeolite catalyst-support particles or directly on the surf...
متن کاملFluorescence spectroscopy of single-walled carbon nanotubes synthesized from alcohol
Abstract Near-infrared fluorescence measurements were performed on single-walled carbon nanotubes (SWNTs) catalytically synthesized from alcohol under various experimental conditions (alcohol catalytic CVD method, ACCVD). The chirality distribution was determined by measuring the fluorescence emitted from separated SWNTs as a function of excitation wavelength. Compared with HiPco SWNTs, chirali...
متن کاملGrowth of Single-walled Carbon Nanotubes at Low Temperature and Low Pressure Cvd Conditions
Controlling the detailed structures of single-walled carbon nanotubes (SWNTs) is imperative for realizing many SWNT applications, and understanding the SWNT growth mechanism is important to improve the growth techniques. In the present study, we performed SWNT growth by a catalytic chemical vapor deposition (CVD) method in wide temperature and pressure ranges, using a high-vacuum CVD chamber. W...
متن کاملCVD growth control of single-walled carbon nanotubes
Chemical vapor deposition (CVD) of singlewalled carbon nanotubes (SWNTs) has been improved in growth controllability for the practical application in electronic and optical devices. Vertically aligned growth of nitrogen-doped and small-diameter SWNTs and horizontally aligned growth on crystal quartz are described. By developing the patterned growth technique, transparent and flexible field effe...
متن کامل