Graphene CVD growth on copper and nickel: role of hydrogen in kinetics and structure

2011 ◽  
Vol 13 (46) ◽  
pp. 20836 ◽  
Author(s):  
Maria Losurdo ◽  
Maria Michela Giangregorio ◽  
Pio Capezzuto ◽  
Giovanni Bruno
Keyword(s):  
Cvd Growth

Vapor-Phase Catalyst Delivery Method for Growing SiC Nanowires

2013 ◽  
Vol 740-742 ◽  
pp. 209-212 ◽  
Author(s):  
Rooban Venkatesh K.G. Thirumalai ◽  
Bharat Krishnan ◽  
Albert Davydov ◽  
Joseph Neil Merrett ◽  
Yaroslav Koshka
Keyword(s):  
Vapor Phase ◽  
Gas Flow ◽  
Substrate Surface ◽  
Metal Catalyst ◽  
Catalyst Nanoparticles ◽  
Sic Nanowires ◽  
Cvd Growth ◽  
Hot Zone

A method was developed for growing SiC nanowires without depositing a metal catalyst on the targeted surfaces prior to the CVD growth. The proposed method utilizes in-situ vapor-phase catalyst delivery via sublimation of the catalyst from a metal source placed in the hot zone of the CVD reactor, followed by condensation of the catalyst-rich vapor on the bare substrate surface to form the catalyst nanoparticles. The vapor-phase catalyst delivery and the resulting nanowire density was found to be influenced by both the gas flow rate and the catalyst diffusion through the boundary layer above the catalyst source. The origin of undesirable bushes of nanowires and the role of the C/Si ratio were established.

Metal catalyst in CVD growth of carbon nanotubes: role of chemical composition

2010 ◽  
Author(s):  
Oleg V. Yazyev ◽  
Alfredo Pasquarello ◽  
Marília Caldas ◽  
Nelson Studart
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Composition ◽  
Metal Catalyst ◽  
Cvd Growth

CVD growth of monolayer MoS2: Role of growth zone configuration and precursors ratio

2017 ◽  
Vol 56 (6S1) ◽  
pp. 06GG05 ◽  
Author(s):  
Ayberk Özden ◽  
Feridun Ay ◽  
Cem Sevik ◽  
Nihan Kosku Perkgöz
Keyword(s):  
Growth Zone ◽  
Monolayer Mos2 ◽  
Cvd Growth

Role of polymers in CVD growth of nanocrystalline diamond films on foreign substrates

2009 ◽  
Vol 246 (11-12) ◽  
pp. 2654-2657 ◽  
Author(s):  
A. Kromka ◽  
S. Potocky ◽  
B. Rezek ◽  
O. Babchenko ◽  
H. Kozak ◽  
...  
Keyword(s):  
Diamond Films ◽  
Nanocrystalline Diamond ◽  
Nanocrystalline Diamond Films ◽  
Cvd Growth

Revealing the microscopic CVD growth mechanism of MoSe2 and the role of hydrogen gas during the growth procedure

2018 ◽  
Vol 29 (31) ◽  
pp. 314001 ◽  
Author(s):  
Hulian Wang ◽  
Dancheng Zhu ◽  
Feng Jiang ◽  
Pei Zhao ◽  
Hongtao Wang ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Hydrogen Gas ◽  
Cvd Growth

The role of surface morphology on nucleation density limitation during the CVD growth of graphene and the factors influencing graphene wrinkle formation

MRS Advances ◽  
2019 ◽  
Vol 4 (61-62) ◽  
pp. 3337-3345 ◽  
Author(s):  
Sajith Withanage ◽  
Tharanga Nanayakkara ◽  
U. Kushan Wijewardena ◽  
Annika Kriisa ◽  
R. G. Mani
Keyword(s):  
Nucleation Density ◽  
Foil Surface ◽  
Cvd Graphene ◽  
Topographic Features ◽  
Flat Substrate ◽  
Cvd Growth ◽  
Cold Rolled ◽  
Transfer Method

ABSTRACTCVD graphene growth typically uses commercially available cold-rolled copper foils, which includes a rich topography with scratches, dents, pits, and peaks. The graphene grown on this topography, even after annealing the foil, tends to include and reflect these topographic features. Further, the transfer of such CVD graphene to a flat substrate using a polymer transfer method also introduces wrinkles. Here, we examine an electropolishing technique for reducing native foil defects, characterize the resulting foil surface, grow single-crystal graphene on the polished foil, and examine the quality of the graphene for such defects.

Synthesis of layered vs planar Mo2C: role of Mo diffusion

2D Materials ◽  
2021 ◽  
Author(s):  
Muhammad Arslan Shehzad ◽  
Paul C. Masih Das ◽  
Alexander C. Tyner ◽  
Matthew Cheng ◽  
Yea-Shine Lee ◽  
...  
Keyword(s):  
Density Functional ◽  
Chemical Vapor ◽  
Vital Role ◽  
Large Area ◽  
Functional Theory ◽  
Precise Control ◽  
Metal Diffusion ◽  
Diffusion Limited ◽  
Cvd Growth

Abstract Chemical Vapor Deposition (CVD) growth of Metal Carbides is of great interest as this method provides large area growth of MXenes. This growth is mainly done using a melted diffusion-based process; however, different morphologies in growth process is not well understood. In this work, we report deterministic synthesis of layered (non-uniform c-axis growth) and planar (uniform c-axis growth) of Molybdenum Carbide (Mo2C) using a diffusion-mediated growth. Mo-diffusion limited growth mechanism is proposed where the competition between Mo and C adatoms determines the morphology of grown crystals. Difference in thickness of catalyst at the edge and center lead to enhanced Mo diffusion which plays a vital role in determining the structure of Mo2C. The layered structures exhibit an expansion in the lattice confirmed by the presence of strain. Density Functional Theory (DFT) shows consistent presence of strain which is dependent upon Mo diffusion during growth. This work demonstrates the importance of precise control of diffusion through the catalyst in determining the structure of Mo2C and contributes to broader understanding of metal diffusion in growth of MXenes.

Mechanisms for Catalytic CVD Growth of Multiwalled Carbon Nanotubes

2008 ◽  
Vol 8 (11) ◽  
pp. 6054-6064 ◽  
Author(s):  
Navdeep Bajwa ◽  
Xuesong Li ◽  
Pulickel M. Ajayan ◽  
Robert Vajtai
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Review Paper ◽  
Chemical Vapor ◽  
Multiwalled Carbon ◽  
Chemical Vapor Deposition Growth ◽  
Complete Knowledge ◽  
Cvd Growth ◽  
Nanotube Growth

Carbon nanotubes possess unique properties that make them potentially ideal materials for various technological applications. However, a basic growth mechanism explaining the way metallic atoms interact with carbon to nucleate, grow and heal CNTs still needs to be understood. In this review paper we describe the mechanisms of catalytic chemical vapor deposition growth of multiwalled carbon nanotubes and carbon nanofibers, the role of various parameters that govern their growth kinetics and the knowledge added to singlewalled nanotube growth. We also examine future strategies needed to reveal complete knowledge of the growth mechanisms of carbon nanotubes.

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