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Author: search.filters.author.Chaisitsak, S.Subject: search.filters.subject.Carbon nanotubes

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    Effect of the deposition condition for carbon nanotube thin films on gas sensing performance
    (2008-01-01)
    Chaisitsak, S.
    ;
    Tuantranont, A.
    A simple fabrication process for single-walled carbon nanotube (SWCNT)-based sensors was reported. By using chemical vapor deposition (CVD) of alcohol-ferrocene mist, SWCNT films could be directly deposited on patterned Al electrodes to fabricate a sensor. The effects of depositing position along the inner quartz reactor on the properties of SWGNT films (morphology, structure and purity) and the characteristics of sensors (response and reproducibility) were investigated. The SWCNT-film-based sensors fabricated at low substrate temperatures of 200-700 °C exhibited a reasonably good sensitivity to saturated organic vapor (ethanol, methanol and acetone) and showed a fair reproducibility even operated at a room temperature (∼28 °C). Copyright © 2008 American Scientific Publishers All rights reserved.
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    Parametric study of atmospheric-pressure single-walled carbon nanotubes growth by ferrocene-ethanol mist CVD
    (2007-11-01)
    Chaisitsak, S.
    ;
    Nukeaw, J.
    ;
    Tuantranont, A.
    Uniform web-like films consisting single-walled carbon nanotubes (SWCNTs) were deposited on a silicon substrate using the chemical vapor deposition (CVD) of ferrocene-ethanol mist at atmospheric pressure (∼ 1 atm). The tiny mist was generated using a high-frequency ultrasonic vibration. The effects of various parameters including deposition position in the reactor, temperature, ferrocene/ethanol ratio, flow rate of carrier gas (argon), and deposition time on the formation of SWCNTs was investigated using high-resolution scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The worm region outside the furnace was found to be a suitable position for the formation of SWCNT films. The furnace temperature and the flow rate of carrier gas were found to determine the diameter and crystallinity of nanotube. The ferrocene concentration in ethanol strongly influenced the amount of impurity particles in the material. Moreover, the intensity of metallic tail in D-band was found to decrease with increasing the flow rate, showing a possibility of the formation of semiconducting SWCNTs. Results of this study can be used to improve understanding of the growth of SWCNTs by floating catalyst CVD of alcohol mist. © 2007 Elsevier B.V. All rights reserved.