Titanium buffer layer for improved field emission of CNT based cold cathode

Srividya, S.; Gautam, Seema; Jha, Pawan Kumar; Kumar, Prashant; Kumar, Avinash; Ojha, Umaprasana; Rawat, J. S.; Pal, Surendra; Chaudhary, P. K.; Harsh,; Sinha, R. K.

doi:10.1016/j.apsusc.2009.12.155

Cited by 25 publications

(13 citation statements)

References 20 publications

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“…While the CNTs bond strongly to their growth catalysts, the catalyst-growth substrate adhesion is highly dependent on substrate preparation and catalyst deposition method. In many cases, CNT arrays can be removed intact from growth substrates 19 . As our growth substrate interface failed first, our adhesion tests give only a lower limit on CNT array-functionalized interface adhesion.…”

Section: Resultsmentioning

confidence: 99%

Enhanced thermal transport at covalently functionalized carbon nanotube array interfaces

et al. 2014

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It has been more than a decade since the experimental demonstration that the thermal conductivity of carbon nanotubes can exceed that of diamond, which has the highest thermal conductivity among naturally occurring materials. In spite of tremendous promise as a thermal material, results have been disappointing for practical thermal systems and applications based on nanotubes. The main culprit for the dramatic shortfall in the performance of nanotubes in practical systems is high thermal interface resistance between them and other components because of weak adhesion at the interface. Here we report a sixfold reduction in the thermal interface resistance between metal surfaces and vertically aligned multiwall carbon nanotube arrays by bridging the interface with short, covalently bonded organic molecules. These results are also significant for single and multilayer graphene applications, since graphene faces similar limitations in practical systems.

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Section: Resultsmentioning

confidence: 99%

Enhanced thermal transport at covalently functionalized carbon nanotube array interfaces

et al. 2014

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“…In fact, thin layers of different compounds (TiO 2 (De Los Arcos et al, 2004), Ti (Srividya et al, 2010), TiN (De Los Arcos et al, 2004;Hiramatsu et al, 2005;García-Céspedes et al, 2009;Lin et al, 2009;Terrado et al, 2009), Al (De Los Arcos et al, 2004;Lin, et al, 2009) have been used to prevent the formation of metal-silicides. In this way, dense mats of vertically aligned multiwall carbon nanotubes have been grown on TiN substrates by using different precursors, including ferrocene (García-Céspedes et al, 2009) or different metals as Fe (De Los Arcos et al, 2004;Srividya et al, 2010;Lin et al, 2009), Ni (Terrado et al, 2009), Co (Hiramatsu et al, 2005) or Fe-Co (Le Normand et al, 2008) as catalysts. Besides its electrically conductive properties, TiN seems to increase the quality of the grown CNTs (i.e., much thinner CNTs with higher density as compared with those obtained on Si substrates) (Terrado et al, 2009;Campo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Development of Ionizing Radiation Sensors Based on Carbon Nanotubes

Fontánez¹,

García²,

Cotto-Maldonado³

et al. 2019

American Journal of Engineering and Applied Sciences

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SWNTs have been efficiently grown on patterned substrates, for its subsequent application to the development of ionizing radiation sensors. SWNTs before and after exposure to X-rays were characterized by Raman and XPS spectroscopy, revealing the appearance of alterations that have been justified as possibly due to the presence of adsorbed oxygen species. These materials have been used for the fabrication of a sensor prototype that has shown a quasi-linear behavior as a function of the time of exposure to X-ray radiation.

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“…Another approach to improve FE properties is by decoration of CNTs apex by low work function materials 25 and introduction of various interlayers such as, Cr, W, Ti, Al, Au, Pd, Pt and Cu. The interlayers provide strong adhesion between CNTs and the substrates leading to better growth and restriction on formation of insulating silicide layers [26][27][28][29][30][31][32] at elevated temperatures. Generally, at high temperatures, the growth of CNTs is prohibited due to silicide formation and deactivation of nucleation sites.…”

Section: Introductionmentioning

confidence: 99%

“…Similar observation was made for CNTs grown on Si, without and with Ti buffer layer. 29 The stability was reported at relatively lower current (∼110 µA) for the first case, and in the second case the temporal stability was checked for a duration of about 1 hour. Better temporal stability at relatively higher current and longer duration was reported in the case CNTs having various morphologies like honey comb configuration, CNT carpet etc.…”

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confidence: 99%

Highly enhanced and temporally stable field emission from MWCNTs grown on aluminum coated silicon substrate

et al. 2015

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In this work, a detailed field emission study of multi-walled carbon nanotubes (MWCNTs) grown on Si and Al coated Si substrates is reported. Morphological and microstructural studies of the films show higher entanglement of CNTs in the case of CNT/Si film as compared to CNT/Al/Si film. Raman studies show that the defect mediated peak (D) is substantially suppressed as compared to graphitic peak (G) resulting in significant reduction in ID/IG value in CNT/Al/Si film. Field emission (FE) current density of CNT/Al/Si film (∼25 mA/cm2) is significantly higher as compared to that of CNT/Si film (∼1.6 mA/cm2). A substantial improvement in temporal stability is also observed in CNT/Al/Si film. This enhancement in field emission current is attributed to strong adhesion between substrate and CNTs, low work function, high local field enhancement factor at the CNT tips and less entanglement of CNTs grown on Al/Si. The temporally stable CNT/Al/Si cold cathode can be a potential candidate to replace conventional electron sources in prototype devices.

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Titanium buffer layer for improved field emission of CNT based cold cathode

Cited by 25 publications

References 20 publications

Enhanced thermal transport at covalently functionalized carbon nanotube array interfaces

Enhanced thermal transport at covalently functionalized carbon nanotube array interfaces

Development of Ionizing Radiation Sensors Based on Carbon Nanotubes

Highly enhanced and temporally stable field emission from MWCNTs grown on aluminum coated silicon substrate

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