Multi-wall carbon nanotubes: Purification, morphology and field emission performance

Su, Shui‐Hsiang; Chiang, Wang-Ta; Lin, Chun-Chang; Yokoyama, M.

doi:10.1016/j.physe.2007.09.087

Cited by 43 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In CNTs, the G band indicates the presence of crystalline graphitic carbon and it is related to the GRA tangential E 2 g Raman active mode, due to two atoms in the GE unit cell vibrating tangentially one against the other (Su et al, 2008;Luo et al, 2009). The D band is usually attributed to the presence of amorphous or disordered carbon in the CNT samples (Datsyuk et al, 2008), and is related to the phonon region close to the k-point GRA Brillouin zone.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Comparison as Effective Photocatalyst or Adsorbent of Carbon Materials of One, Two, and Three Dimensions for the Removal of Reactive Red 2 in Water

Pérez-RamírezEduardo

Rosa-ÁlvarezGuadalupe

Salas

et al. 2015

Environmental Engineering Science

View full text Add to dashboard Cite

Photocatalytic degradation and removal by adsorption of the Reactive Red 2 (RR2) dye in the presence of different pristine and functionalized one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) carbon structures were investigated and compared, considering also the loading of catalyst/adsorbent. Previous to photocatalytic and adsorption evaluation, all carbon materials were characterized to verify functionalization, structural changes, and surface properties useful in the removal of this pollutant in water. Materials were analyzed by Raman and infrared spectroscopies, transmission electron microscopy, and besides, the pH of the point of zero charge (pH pzc ) was determined by potentiometric titrations, and band gap by ultraviolet-visible spectroscopy through Tauc plot. Removal of RR2 increases with the load of carbon materials. One-dimensional materials showed better performance in the decolorization of RR2 dye, removing the whole color of the solution. RR2 removal values obtained by the photocatalytic and adsorption processes are very similar. Thus, the adsorption process predominates over the photocatalytic activity, only the samples of graphene and graphene oxide present slight photocatalytic activity. The adsorption process was strongly influenced by the carbon material dimension. However, other factors like surface oxygenated groups, surface area, and the shape of the carbon structures, as well as the structure and nature of the dye also play an important role in this process. Experimental adsorption data of all carbon materials were best fitted to pseudo second-order kinetic model, and, it is concluded that physisorption with strong interaction is the process by which carbon materials adsorb to the dye. Thus, the mechanism of RR2 adsorption on carbon materials is by the aromatic rings of the RR2 and p delocalized electrons on carbon materials.

show abstract

Section: Resultsmentioning

confidence: 99%

“…4e), it can be seen that some CNTs have damaged open ends and walls, which is attributed to the action of acids (Fig. 4e, f) (Su et al, 2008). The entanglement of the CNTs persists after the oxidation process.…”

Section: Infrared Spectroscopymentioning

confidence: 87%

Comparison as Effective Photocatalyst or Adsorbent of Carbon Materials of One, Two, and Three Dimensions for the Removal of Reactive Red 2 in Water

Pérez-RamírezEduardo

Rosa-ÁlvarezGuadalupe

Salas

et al. 2015

Environmental Engineering Science

View full text Add to dashboard Cite

show abstract

“…The properties of a nanostructured catalyst influences on the CVD synthesis of CNS. Several methods have been proposed to prepare systems containing metal nanoparticles supported on different substrates [6,7], in particular on conductive smooth surface substrates, as it is required for the application of the CNS to field emission. In this paper, the method employed to deposite Ni films was a pulsed vacuum arc discharge.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes and nanofibers synthesized by CVD on nickel coatings deposited with a vacuum arc

Escobar

Giuliani

Candal

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Figure 6 depicts the average diameter of CNTs obtained using various iron nitrate concentrations. -bonded carbon atoms in a two-dimensional hexagonal lattice, indicates the presence of crystalline graphitic carbon atoms [16]. The D band originates from vibrations of carbon atoms with dangling bonds.…”

Section: Figurementioning

confidence: 99%

Synthesis of carbon nanotubes using screen‐printing catalyst and its application for a field emission device

Chiang

et al. 2010

Phys. Status Solidi (c)

Self Cite

View full text Add to dashboard Cite

Iron nitrate (Fe(NO3)3.9H2O) catalyst is screen‐printed over silicon substrates and efficiently utilized to catalyze the synthesis of carbon nanotubes (CNTs) by thermal chemical vapor deposition (CVD). The concentration of iron nitrate influences the particle size distribution of the Fe catalyst, which determines the morphology of the obtained CNT arrays. H2 is introduced in varying concentrations in a CH4/N2 mixed gas during the synthesis of the CNTs, from which CNTs with uniform diameter distribution are grown. A field emission device that employs CNTs as emitters exhibits a current density of 9 mA/cm2 at an electrical field of 1.2 V/μm. This work demonstrates the potential to synthesize CNTs using a screen‐printed catalyst, which is a requirement for field emitter application at a large size. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Multi-wall carbon nanotubes: Purification, morphology and field emission performance

Cited by 43 publications

References 21 publications

Comparison as Effective Photocatalyst or Adsorbent of Carbon Materials of One, Two, and Three Dimensions for the Removal of Reactive Red 2 in Water

Comparison as Effective Photocatalyst or Adsorbent of Carbon Materials of One, Two, and Three Dimensions for the Removal of Reactive Red 2 in Water

Carbon nanotubes and nanofibers synthesized by CVD on nickel coatings deposited with a vacuum arc

Synthesis of carbon nanotubes using screen‐printing catalyst and its application for a field emission device

Contact Info

Product

Resources

About