Characterizing Multi-Walled Carbon Nanotube Synthesis for Field Emission Applications

Crossley, Benjamin L.; Glauvitz, Nathan E.; Quinton, Betty T.; Coutu, Ronald A.; Collins, P.J.

doi:10.5772/17782

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…A relative determination of CNT quality can be found by comparing the ratio of the D band intensity ( I D ) over the G band intensity ( I G ). The I D / I G ratio of multi-walled CNTs varies from 0.47 (with best quality) to 1.58 (highly defective) depending on the growth method and catalyst/barrier combinations [ 27 ]. The I D / I G ratio of as-grown CNTs in this work is about 0.83, indicating a slightly higher defect density in CNTs.…”

Section: Resultsmentioning

confidence: 99%

“…The I D / I G ratio of as-grown CNTs in this work is about 0.83, indicating a slightly higher defect density in CNTs. Nevertheless, a previous study found no clear correlation between CNT quality as determined by Raman spectroscopy and CNT field emission due to the effects CNT areal density has on field emission [ 27 ], indicating that it is electrostatic screening effect that dominates the performance of a field emitter. The cause of higher defect density in CNTs grown atop SiNWs and the influence of defect density in CNTs to the field emission performance of the CNT-SiNW bundle array require further investigations.…”

Section: Resultsmentioning

confidence: 99%

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Patterned growth of carbon nanotubes over vertically aligned silicon nanowire bundles for achieving uniform field emission

Hung

Chang

et al. 2014

Nanoscale Res Lett

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A fabrication strategy is proposed to enable precise coverage of as-grown carbon nanotube (CNT) mats atop vertically aligned silicon nanowire (VA-SiNW) bundles in order to realize a uniform bundle array of CNT-SiNW heterojunctions over a large sample area. No obvious electrical degradation of as-fabricated SiNWs is observed according to the measured current-voltage characteristic of a two-terminal single-nanowire device. Bundle arrangement of CNT-SiNW heterojunctions is optimized to relax the electrostatic screening effect and to maximize the field enhancement factor. As a result, superior field emission performance and relatively stable emission current over 12 h is obtained. A bright and uniform fluorescent radiation is observed from CNT-SiNW-based field emitters regardless of its bundle periodicity, verifying the existence of high-density and efficient field emitters on the proposed CNT-SiNW bundle arrays.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Patterned growth of carbon nanotubes over vertically aligned silicon nanowire bundles for achieving uniform field emission

Hung

Chang

et al. 2014

Nanoscale Res Lett

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“…To explore the relationship between waviness and CNT defects, Raman analysis of the sheets was performed. By taking the ratio of disordered peak, D (~1350 cm -1 ), and crystalline graphite peak, G (~1600 cm -1 ), the information about crystalline defects and amorphous carbon presented in the CNTs can be obtained [48][49][50]. In general, smaller ratios, are characteristic of samples with high CNT purity and less defects [49].…”

Section: Thermal Testingmentioning

confidence: 99%

Dual use of carbon nanotube selective coatings in evacuated tube solar collectors

Martínez

Pozdin

Papadimitratos

et al. 2017

Carbon

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Continuous carbon nanotube sheets spun from the side of vertically aligned forests were investigated as solar selective coatings in evacuated tube collectors for solar thermal applications and for Joule heating in the absence of solar radiation. Forests grown by chemical vapor deposition at various synthesis temperatures produced sheets with tunable thermal and optical properties. The sheets were laminated on miniature and regular size evacuated tube collectors and tested at 100 mW/cm 2 AM 1.5 solar illumination under high vacuum. It was found that 10 layers of carbon nanotube sheets with medium sheet areal density produced the best solar selective coating. Interestingly, carbon nanotube sheet densification with organic solvents slightly increased the reflectance and significantly decreased the emissivity; improving the

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In-Situ Direct Observation of Carbon Nanotube Synthesis Under Electric Field and Their Field Emission Performance

Vincent

Panciera

Florea

et al. 2023

2023 IEEE 36th International Vacuum Nanoelectronics Conference (IVNC)

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Characterizing Multi-Walled Carbon Nanotube Synthesis for Field Emission Applications

Cited by 3 publications

References 28 publications

Patterned growth of carbon nanotubes over vertically aligned silicon nanowire bundles for achieving uniform field emission

Patterned growth of carbon nanotubes over vertically aligned silicon nanowire bundles for achieving uniform field emission

Dual use of carbon nanotube selective coatings in evacuated tube solar collectors

In-Situ Direct Observation of Carbon Nanotube Synthesis Under Electric Field and Their Field Emission Performance

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