Enhanced electron emission from titanium coated multiwalled carbon nanotubes

Sharma, Himani; Kaushik, Vishakha; Girdhar, P.; Singh, V. N.; Shukla, Anupam; Vankar, V. D.

doi:10.1016/j.tsf.2010.07.043

Cited by 26 publications

(12 citation statements)

References 24 publications

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“…The variation of D to G peak ratio could be due to (i) change in Raman scattering cross-section due to change in electron density of states (DOS) as revealed by XPS and discussed in the subsequent paragraph; (ii) the ratio of D to G peak (I D /I G ) is also an indicator of defect density and crystallite size as reported in the literature. The decrease in I D /I G value corresponds to increased crystallinity and decreased sp 3 bonded carbon as reported for Ti coated CNT [41]. Lesser the defect, which in turn means lesser amorphous carbon, and better in plane graphitic crystallinity is reported in Cu decorated CNTs [29].…”

Section: Resultssupporting

confidence: 51%

Improved field emission from indium decorated multi-walled carbon nanotubes

Sreekanth

Ghosh

Biswas

et al. 2016

Applied Surface Science

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Section: Resultssupporting

confidence: 51%

Improved field emission from indium decorated multi-walled carbon nanotubes

Sreekanth

Ghosh

Biswas

et al. 2016

Applied Surface Science

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“…The materials combined to form hybrids with CNTs are mainly metals (gold (Au), silver (Ag), titanium (Ti), platinum (Pt), palladium (Pd)) and metal oxides (zinc oxide, titanium dioxide, etc. ), as reported by various groups.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman scattering and fluorescence emission of gold nanoparticle–multiwalled carbon nanotube hybrids

Sharma

Agarwal

Shukla

et al. 2012

J Raman Spectroscopy

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Multiwalled carbon nanotubes (MWCNTs) are grafted with gold (Au) nanoparticles of different sizes (1-12 and 1-20 nm) to form Au-MWCNT hybrids. The Au nanoparticles pile up at defect sites on the edges of MWCNTs in the form of chains. The micro-Raman scattering studies of these hybrids were carried using visible to infrared wavelengths (514.5 and 1064 nm). Enhanced Raman scattering and fluorescence is observed at an excitation wavelength of 514.5 nm. It is found that the graphitic (G) mode intensity enhances by 10 times and down shifts by approximately 3 cm À1 for Au-MWCNT hybrids in comparison with pristine carbon nanotubes. This enhancement in G mode due to surface-enhanced Raman scattering effect is related to the interaction of MWCNTs with Au nanoparticles. The enhancement in Raman scattering and fluorescence for large size nanoparticles for Au-MWCNTs hybrids is corroborated with localized surface plasmon polaritons. The peak position of localized surface plasmons of Au nanoparticles shifts with the change in environment. Further, no enhancement in G mode was observed at an excitation wavelength of 1064 nm. However, the defect mode (D) mode intensity enhances, and peak position is shifted by approximately 40 cm À1 to lower side at the same wavelength. The enhanced intensity of D mode at 1064 nm excitation wavelength is related to the double resonance phenomenon and shift in the particular mode occurs due to more electron phonon interactions near Fermi level.

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“…Microwave plasma enhanced chemical vapor deposition method was used to synthesize MWCNTs following the same procedure as reported in our earlier work. 26 In short, 550 W microwave power was applied at 2.45 GHz frequency and the chamber pressure was kept at 1.0 Torr for MWCNT deposition. A mixture of hydrogen and acetylene with a precisely maintained ratio of 1:5 at a pressure of 5.0 Torr was used as precursor gas.…”

Section: A Sample Preparationmentioning

confidence: 99%

Enhanced field emission from lanthanum hexaboride coated multiwalled carbon nanotubes: Correlation with physical properties

Patra

Ghosh

Sheremet

et al. 2014

Journal of Applied Physics

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Detailed results from field emission studies of lanthanum hexaboride (LaB 6) coated multiwalled carbon nanotube (MWCNT) films, pristine LaB 6 films, and pristine MWCNT films are reported. The films have been synthesized by a combination of chemical and physical deposition processes. An impressive increase in field enhancement factor and temporal stability as well as a reduction in turn-on field and threshold field are observed in LaB 6-coated MWCNTs compared to pristine MWCNT and pristine LaB 6 films. Surface morphology of the films has been examined by scanning electron microscopy. Introduction of LaB 6 nanoparticles on the outer walls of CNTs LaB 6-coated MWCNTs films is confirmed by transmission electron microscopy. The presence of LaB 6 was confirmed by X-ray photoelectron spectroscopy results and further validated by the Raman spectra. Raman spectroscopy also shows 67% increase in defect concentration in MWCNTs upon coating with LaB 6 and an upshift in the 2D band that could be attributed to p-type doping. Ultraviolet photoelectron spectroscopy studies reveal a reduction in the work function of LaB 6-coated MWCNT with respect to its pristine counterpart. The enhanced field emission properties in LaB 6-coated MWCNT films are correlated with a change in microstructure and work function.

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Enhanced electron emission from titanium coated multiwalled carbon nanotubes

Cited by 26 publications

References 24 publications

Improved field emission from indium decorated multi-walled carbon nanotubes

Improved field emission from indium decorated multi-walled carbon nanotubes

Surface‐enhanced Raman scattering and fluorescence emission of gold nanoparticle–multiwalled carbon nanotube hybrids

Enhanced field emission from lanthanum hexaboride coated multiwalled carbon nanotubes: Correlation with physical properties

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