Growth dynamics of vertically aligned single-walled carbon nanotubes from in situ measurements
نویسندگان
چکیده
منابع مشابه
Growth dynamics of vertically aligned single-walled carbon nanotubes from in situ measurements
An in situ optical absorbance measurement was used to study the growth dynamics of vertically aligned single-walled carbon nanotubes (VA-SWCNTs) synthesized by chemical vapor deposition of ethanol. The growth rate of the VA-SWCNT film was found to decay exponentially from an initial maximum, resulting in an effective growth time of approximately 15 minutes. Investigation of various growth condi...
متن کاملGrowth Process of Vertically Aligned Single-walled Carbon Nanotubes
The growth process of vertically aligned single-walled carbon nanotube (SWNT) films was investigated by means of in situ optical analysis and scanning electron microscopy. The measurements reveal that the growth of the SWNT film decreases after longer reaction times. This decrease is attributed to a combination of a diminishing growth rate and burning of the SWNTs due to oxygen in the growth ch...
متن کاملA Growth Mechanism for Vertically Aligned Single-Walled Carbon Nanotubes
One of the difficulties in developing practical nanotube-based devices is the large-scale production of aligned carbon nanotubes (CNTs). Due to their novel electronic and thermal properties, single-walled nanotubes (SWNTs) show great potential for use a variety of applications . The alignment of SWNTs has been reported, but only parallel to the substrate in the presence of strong electric or ma...
متن کاملDiameter modulation of vertically aligned single-walled carbon nanotubes.
We demonstrate wide-range diameter modulation of vertically aligned single-walled carbon nanotubes (SWNTs) using a wet chemistry prepared catalyst. In order to ensure compatibility to electronic applications, the current minimum mean diameter of 2 nm for vertically aligned SWNTs is challenged. The mean diameter is decreased to about 1.4 nm by reducing Co catalyst concentrations to 1/100 or by i...
متن کاملPolarized Raman spectroscopy on vertically aligned single-walled carbon nanotubes
Vertically aligned single-walled carbon nanotube (VA-SWNT) films with high purity have been prepared up to 30 μm thick by the alcohol catalytic chemical vapor deposition (CVD) method[1][2]. In a previous polarized Raman spectroscopy study, we found anomalous anisotropic peaks such as at 180 cm for the excitation by 488 nm laser and explained them as perpendicularly polarized excitation [3]. How...
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ژورنال
عنوان ژورنال: Carbon
سال: 2008
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2008.02.021