Thermal desorption and its effects on field emission properties of carbon nanowalls

Jiang, Nan; Wang, Hongxing; Sasaoka, Hideki; Deno, Tetsuya; Nishimura, K.

doi:10.1016/j.matlet.2010.06.028

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…First, carbon nanowalls contain hydrocarbon adsorbates generated in CH 4 /H 2 plasma during synthesis. 5,18 Second, there is a feasible difference in thermal expansion coefficients of single-and multilayer graphene. 19 We assume that interaction between the ''bulk'' nanowall and its external layer may be reduced due to hydrocarbon adsorbates located between them.…”

Section: Resultsmentioning

confidence: 99%

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Self-assembled nanoparticle patterns on carbon nanowall surfaces

Suetin

Evlashin

Егоров

et al. 2016

Phys. Chem. Chem. Phys.

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We observed that thermally treated carbon nanowalls serve efficiently as templates governing the formation of quasiperiodic patterns for nanoparticles deposited. Here we report self-assembled quasi-regular structures of diverse nanoparticles on a freestanding multilayer graphene-like material, i.e. carbon nanowalls. Metallic (Ag, Al, Co, Mo, Ni, and Ta) and semiconductor (Si) nanoparticles form coaxial polygonal closed loop structures or parallel equidistant rows, which evolve upon further deposition into bead-like structures and, finally, into nanowires. Weakly bonded nanoparticles decorate atomic steps, wrinkles and other extended defects on the carbon nanowalls as a result of anisotropic diffusion of atoms or clusters along the hexagonal sp(2)-carbon network followed by their aggregation and agglomeration. The decorated carbon nanowalls are found to be promising materials for surface enhanced Raman scattering (SERS) analysis.

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Section: Resultsmentioning

confidence: 99%

“…Further annealing of carbon nanowalls in a high vacuum stimulates desorption of hydrocarbons which is known to be occurred in the temperature range of 100-400 1C. 18 This leads to the stress relaxation of the external layer and the appearance of wrinkles. Schematically this process is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-assembled nanoparticle patterns on carbon nanowall surfaces

Suetin

Evlashin

Егоров

et al. 2016

Phys. Chem. Chem. Phys.

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“…of CNW/CNS; these include but are not limited to (i) reducing the screening effects among adjacent CNW/CNS flakes through selective growth, [4][5][6][7][8] (ii) improving the structure and morphology of CNW/CNS via fine tuning of the synthesis conditions, such as the types of carbon feedstock, 9 gas flow ratio, [10][11][12][13] deposition temperature, 14 substrate temperature, 12 and growth time, 13 (iii) chemical doping to reduce the turn-on field, [14][15][16][17] and (iv) surface treatment to improve the field emission characteristics of the as-grown CNW/CNS, such as selective coating of a thin layer of Mo 2 C, 18 Au, Al and Ti, 19 plasma surface modification 20 and thermal desorption of absorbed hydrocarbons. 21 Most of the experimental results can be successfully explained by the Fowler-Nordheim (F-N) model 22 which predicts a linear relation between emission current (I) and applied electric field (E) in the F -N plot [i.e. ln(I/E 2 ) vs. 1/E], though slight modification is sometimes needed to better account for the experimental observations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic control of local field emission current from carbon nanowalls

Wang

Yang

2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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We report on a systematic study of modulation of the field emission current from carbon nanowalls using a sharp probe as the anode in an ultrahigh vacuum system. Modulation of the local emission current was achieved by either varying the anode-cathode distance (d) with the aid of an AC magnetic field or superimposing a small AC bias on a DC bias during the field emission measurement. Current modulation ratio of over two orders of magnitude was achieved with the modulation becoming more efficient at a smaller d. The experimental results are discussed using the Fowler-Nordheim theory in combination with a simple cantilever model to account for the modulation effect. The experimental results demonstrated good static stability and dynamic controllability of local field emission current from the carbon nanowalls.2

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“…Concerning materials, carbon is well known to be beneficial for industrial applications and fusion device walls 7) because of its low atomic number, good thermomechanical properties, and high electrical conductivity. In particular, diamond-like carbon, 8) carbon nanotubes, 9) and carbon nanowalls 10) are expected to be used for industrial applications because of their great characteristics, such as chemical stability, high mechanical strength, and field emission property, 11) respectively. In both fusion and processing plasmas, carbon-hydrogen interaction is an important topic, and it is of importance in the investigation of the fundamental characteristics of the interaction.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Graphite Erosion in Low-Temperature and High-Density Deuterium Plasma

Teraoka¹,

Ohno²,

Kajita³

et al. 2012

Jpn. J. Appl. Phys.

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Chemical reactions carried out under strongly non-equilibrium conditions can result in a variety of interesting effects such as oscillations, chemical waves, kinetic phase transitions, bistability, instabilities and chaos-all of these effects being mathematically due to the strong non-linearities in the kinetic rate equations describing these chemical processes. The present article reviews the various types of non-linear behaviour observed in several NO reduction reactions over Pt-group metals. A large part of this review deals with oscillations and spatiotemporal pattern formation in the NO-H 2 reaction over Rh surfaces: the reaction dynamics of this system has been realized on the microscopic, mesoscopic and macroscopic scales using field emission microscopy, photoemission electron microscopy and macroscopic rate measurements respectively. The various mechanisms of this and the other reactions reviewed in this article are also considered. † Tel: (31) 71 5274545; fax: (31) 71 5274251.

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Thermal desorption and its effects on field emission properties of carbon nanowalls

Cited by 8 publications

References 10 publications

Self-assembled nanoparticle patterns on carbon nanowall surfaces

Self-assembled nanoparticle patterns on carbon nanowall surfaces

Dynamic control of local field emission current from carbon nanowalls

Anisotropic Graphite Erosion in Low-Temperature and High-Density Deuterium Plasma

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