Electron emissive properties of CNT films grown by catalytic method on different types of substrates

Kowalska, E.; Czerwosz, E.; Dłużewski, Piotr; Kozłowski, Mirosław; Radomska, J.

doi:10.1016/j.diamond.2004.01.004

Cited by 21 publications

(8 citation statements)

References 23 publications

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“…This algorithm provides E turn−on ≈ 15V /µm, a good figure considering the screening effect, which agrees with values obtained on similar MWCNT films (see for example Ref. [53]).…”

Section: E Turn-on Fieldsupporting

confidence: 89%

A local field emission study of partially aligned carbon-nanotubes by atomic force microscope probe

Bartolomeo

Scarfato

Giubileo

et al. 2007

Carbon

101

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Atomic force microscopy (AFM) was used to study the field emission (FE) properties of a dense array of long and vertically quasi-aligned multi-walled carbon nanotubes grown by catalytic chemical vapor deposition on a silicon substrate. The use of nanometric probes enables local field emission measurements to be made allowing the investigation of effects that are not detectable with a conventional parallel plate setup, where the emission current is averaged over a large sample area. The micrometric inter-electrode distance allows one to achieve high electric fields with a modest voltage. These features made us able to characterize field emission for macroscopic electric fields up to 250V/μm and attain current densities larger than 10^5A/cm^2. FE behaviour is analyzed in the framework of the Fowler-Nordheim theory. A field enhancement factor γ~40-50 and a turn-on field Eturn-on ~15V/μm at an inter-electrode distance of 1μm are estimated. Current saturation observed at high voltages in the I-V characteristics is explained in terms of a series resistance of the order of MΩ. Additional effects, such as electrical conditioning, CNT degradation, response to laser irradiation and time stability are investigated and discussed

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“…This algorithm provides E turn−on ≈ 15V /µm, a good figure considering the screening effect, which agrees with values obtained on similar MWCNT films (see for example Ref. [53]).…”

Section: E Turn-on Fieldsupporting

confidence: 89%

A local field emission study of partially aligned carbon-nanotubes by atomic force microscope probe

Bartolomeo

Scarfato

Giubileo

et al. 2007

Carbon

101

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“…This could be connected with changes of emissive centers responsible for this emission at increasing electric field value. Such effects were described in paper [21], where it was confirmed that the curvature of CNTs and their length have an influence on the field emission phenomenon due to changing the field enhancement factor β.…”

Section: Carbon Nanotubes Films On Al 2 O 3 Substratementioning

confidence: 60%

Influence of duration time of CVD process on emissive properties of carbon nanotubes films

Stępińska

Kozłowski

Radomska

et al. 2015

Materials Science-Poland

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In this paper various types of films made of carbon nanotubes (CNTs) are presented. These films were prepared on different substrates (Al 2 O 3 , Si n-type) by the two-step method. The two-step method consists of physical vapor deposition step, followed by chemical vapor deposition step (PVD/CVD). Parameters of PVD process were the same for all initial films, while the duration times of the second step -the CVD process, were different (15, 30 min.). Prepared films were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and field emission (FE) measurements. The I-E and F-N characteristics of electron emission were discussed in terms of various forms of CNT films. The value of threshold electric field ranged from few V/µm (for CNT dispersed rarely on the surface of the film deposited on Si) up to ∼20 V/µm (for Al 2 O 3 substrate).

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“…1,3,6,[22][23][24] Since ␤ is determined from the geometrical shape of the field emitter, one would expect that a thinner Pd layer which gives rise to smaller nanotubes might lead to a higher ␤.The result however indicates that the apparent ␤ value also depends on CNTs processing parameters that control the final CNTs con- The as-grown CNTs also contain some very small nanotubes with diameter less than 20 nm. The better performance of the CNTs with longer pretreatment time and similarity in the emission characteristics is most likely attributable to the better mixing of smaller nanotubes and diameter distributions within the three samples ͑9a-c͒, where they have a dominant ␤ in the field emission.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6] CNTs are mechanically strong and thermally and chemically stable, giving them excellent field emission characteristics. [1][2][3][4][5][6] CNTs are mechanically strong and thermally and chemically stable, giving them excellent field emission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effects of deposition and synthesis parameters on size, density, structure, and field emission properties of Pd-catalyzed carbon nanotubes synthesized by thermal chemical vapor deposition

Wei

Kang

Hofmeister

et al. 2005

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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Articles you may be interested inEffect of parameters on carbon nanotubes grown by floating catalyst chemical vapor deposition AIP Conf. Proc. 1502, 242 (2012); 10.1063/1.4769148 Effect of ZnO catalyst on carbon nanotube growth by thermal chemical vapor deposition J. Vac. Sci. Technol. B 26, 1765 (2008); 10.1116/1.2981084 Particle size dependence and model for iron-catalyzed growth of carbon nanotubes by thermal chemical vapor deposition J. Appl. Phys. 93, 4185 (2003); 10.1063/1.1559433Variations in structure and emission characteristics of nanostructured carbon films prepared by the hot-filament chemical-vapor-deposition method due to the addition of ammonia in the source The effects of deposition parameters and NH 3 pretreatment on the size and distribution of Pd catalytic particles and subsequently their effects on the characteristics of the synthesized carbon nanotubes ͑CNTs͒ were systematically investigated. It was found that the size of Pd particles decreases and the particle density ͑total number of Pd particles per unit area͒ increases as the Pd film thickness decreases. Moreover, pretreatment of Pd film in NH 3 gas promotes smaller Pd particles and higher particle density which is beneficial for CNT growth. The CNTs were synthesized by thermal chemical vapor deposition at 750°C using methane ͑CH 4 ͒ as the carbon source, and a mixture of Ar/H 2 ͑80 vol %: 20 vol %͒ as a carrier gas with NH 3 serving as a processing reagent. The incorporation of NH 3 in CNT synthesis, per the specific pretreatment of catalytic film, has a distinct effect on the size and morphology of CNTs produced. The interrelation between processing, structure and emission behavior of CNTs produced with different synthesis conditions was examined by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and field emission measurements.

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Electron emissive properties of CNT films grown by catalytic method on different types of substrates

Cited by 21 publications

References 23 publications

A local field emission study of partially aligned carbon-nanotubes by atomic force microscope probe

A local field emission study of partially aligned carbon-nanotubes by atomic force microscope probe

Influence of duration time of CVD process on emissive properties of carbon nanotubes films

Effects of deposition and synthesis parameters on size, density, structure, and field emission properties of Pd-catalyzed carbon nanotubes synthesized by thermal chemical vapor deposition

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