Aligned synthesis of multi-walled carbon nanotubes with high purity by aerosol assisted chemical vapor deposition: Effect of water vapor

Líu, Hao; Zhang, Yong; Li, Ruying; Sun, Xueliang; Wang, Fengping; Ding, Zhifeng; Mérel, Philippe; Désilets, S.

doi:10.1016/j.apsusc.2010.02.074

Cited by 27 publications

(15 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The significant increase in the carbon yield at appropriate water vapor content demonstrates the role of water in improving and preserving the catalytic activity. These results agree well with the findings reported by other research groups [10,[15][16][17].…”

Section: Methodssupporting

confidence: 96%

“…This result indicates that an excessive water vapor concentration, in this case 266.7 ppm, suppresses CNT growth. There are three possible explanations for this observation: produced CNTs [18] and (iii) hindrance of carbon diffusion to active sites (poisoning of the growth process) [10]. When an excessive amount of water vapor was introduced into the CVD reaction conditions, the active metal sites could be oxidized due to the behavior of water as an oxidizing agent.…”

Section: Methodsmentioning

confidence: 96%

“…When an optimum amount of water vapor used, the crystallinity of the CNTs is improved, and the carbonaceous impurities adhered to the tube walls are eliminated. However, when the amount of water is increased by too much, distorted CNTs with abundant defects are obtained [10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

Lee

Yeoh

Chai

et al. 2012

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

Section: Methodssupporting

confidence: 96%

Section: Methodsmentioning

confidence: 96%

See 1 more Smart Citation

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

Lee

Yeoh

Chai

et al. 2012

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

“…The FWHM of the D-band (FWHM (D)) of modified CNTs (MICNTs and NI-CNTs) is narrowed than the CNTs. This is consistent with the introduction of a polymeric matrix which causes disorder bonds and amorphous carbon since FWHM (D) has the same tendency as the intensity ratio D/G [50,53].…”

Section: Raman Analysissupporting

confidence: 66%

Recycling old screen-printed electrodes with newly designed plastic antibodies on the wall of carbon nanotubes as sensory element for in situ detection of bacterial toxins in water

Queirós

Guedes

Marques

et al. 2013

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

a b s t r a c tUsing low cost portable devices that enable a single analytical step for screening environmental contaminants is today a demanding issue. This concept is here tried out by recycling screen-printed electrodes that were to be disposed of and by choosing as sensory element a low cost material offering specific response for an environmental contaminant. Microcystins (MCs) were used as target analyte, for being dangerous toxins produced by cyanobacteria released into water bodies. The sensory element was a plastic antibody designed by surface imprinting with carefully selected monomers to ensure a specific response. These were designed on the wall of carbon nanotubes, taking advantage of their exceptional electrical properties. The stereochemical ability of the sensory material to detect MCs was checked by preparing blank materials where the imprinting stage was made without the template molecule.The novel sensory material for MCs was introduced in a polymeric matrix and evaluated against potentiometric measurements. Nernstian response was observed from 7.24 × 10 −10 to 1.28 × 10 −9 M in buffer solution (10 mM HEPES, 150 mM NaCl, pH 6.6), with average slopes of −62 mV decade −1 and detection capabilities below 1 nM. The blank materials were unable to provide a linear response against log(concentration), showing only a slight potential change towards more positive potentials with increasing concentrations (while that of the plastic antibodies moved to more negative values), with a maximum rate of +33 mV decade −1 . The sensors presented good selectivity towards sulphate, iron and ammonium ions, and also chloroform and tetrachloroethylene (TCE) and fast response (<20 s). This concept was successfully tested on the analysis of spiked environmental water samples. The sensors were further applied onto recycled chips, comprehending one site for the reference electrode and two sites for different selective membranes, in a biparametric approach for "in situ" analysis.

show abstract

“…Utilizing water vapor during the forest synthesis can reduce the amount of amorphous content, while also the activity and lifetime of the catalyst increased [264]. The proper amount of water was also investigated, and it was found that while some water vapor can increase the quality of the final product, too much water has a negative effect [265]. By optimizing all reaction conditions, including water content, a 21.7 mm high CNT forest was grown recently, which was a record at the time [266].…”

Section: 52c 3d Nanotube Assembliesmentioning

confidence: 99%

Carbon nanostructures with different dimensionality – From synthesis to applications

Puskás

View full text Add to dashboard Cite

Aligned synthesis of multi-walled carbon nanotubes with high purity by aerosol assisted chemical vapor deposition: Effect of water vapor

Cited by 27 publications

References 24 publications

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

The role of water vapor in carbon nanotube formation via water-assisted chemical vapor deposition of methane

Recycling old screen-printed electrodes with newly designed plastic antibodies on the wall of carbon nanotubes as sensory element for in situ detection of bacterial toxins in water

Carbon nanostructures with different dimensionality – From synthesis to applications

Contact Info

Product

Resources

About