Formation of carbon nanostructures with Ge and SiC nanoparticles prepared by direct current and radio frequency hybrid arc discharge

2000 ◽  
Vol 15 (10) ◽  
pp. 2182-2186 ◽  
Author(s):  
Takeo Oku ◽  
T. Hirata ◽  
N. Motegi ◽  
R. Hatakeyama ◽  
N. Sato ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Direct Current ◽  
Carbon Nanostructures ◽  
Arc Discharge ◽  
Growth Direction ◽  
Structure Model ◽  
Sic Nanoparticles ◽  
High Resolution Images ◽  
Carbon Nanocage ◽  
Discharge Method

Carbon nanocage structures with Ge and SiC nanoparticles were synthesized by direct current and radio frequency (dc-rf) hybrid arc discharge of C, Ge, and Si elements. High-resolution images showed the formation of Ge and SiC nanoparticles and nanowires encapsulated in carbon nanocapsules and nanotubes. The growth direction of the Ge nanowires was found to be 〈111〉 of Ge, and a structure model for Ge/C interface was proposed. The present work indicates that the various carbon nanostructures with semiconductor nanoparticles and nanowires can be synthesized by the dc-rf hybrid arc-discharge method.

scholarly journals Preparation of Nickel Nanoparticles by Direct Current Arc Discharge Method and Their Catalytic Application in Hybrid Na-Air Battery

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 684 ◽  
Author(s):  
Fengmei Su ◽  
Xuechao Qiu ◽  
Feng Liang ◽  
Manabu Tanaka ◽  
Tao Qu ◽  
...  
Keyword(s):  
Direct Current ◽  
Composite Structures ◽  
High Speed ◽  
Large Scale ◽  
Nickel Nanoparticles ◽  
Arc Discharge ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Air Battery ◽  
Discharge Method

Nickel nanoparticles were prepared by the arc discharge method. Argon and argon/hydrogen mixtures were used as plasma gas; the evaporation of anode material chiefly resulted in the formation of different arc-anode attachments at different hydrogen concentrations. The concentration of hydrogen was fixed at 0, 30, and 50 vol% in argon arc, corresponding to diffuse, multiple, and constricted arc-anode attachments, respectively, which were observed by using a high-speed camera. The images of the cathode and anode jets were observed with a suitable band-pass filter. The relationship between the area change of the cathode/anode jet and the synchronous voltage/current waveform was studied. By investigating diverse arc-anode attachments, the effect of hydrogen concentration on the features of nickel nanoparticles were investigated, finding that 50 vol% H2 concentration has high productivity, fine crystallinity, and appropriate size distribution. The synthesized nickel nanoparticles were then used as catalysts in a hybrid sodium–air battery. Compared with commercial a silver nanoparticle catalyst and carbon black, nickel nanoparticles have better electrocatalytic performance. The promising electrocatalytic activity of nickel nanoparticles can be ascribed to their good crystallinity, effective activation sites, and Ni/NiO composite structures. Nickel nanoparticles prepared by the direct current (DC) arc discharge method have the potential to be applied as catalysts on a large scale.

Aerosol synthesis of titanium nitride nanoparticles by direct current arc discharge method

2020 ◽  
Vol 31 (9) ◽  
pp. 4119-4128
Author(s):  
Qingqing Fu ◽  
David Kokalj ◽  
Dominic Stangier ◽  
Frank Einar Kruis ◽  
Wolfgang Tillmann
Keyword(s):  
Titanium Nitride ◽  
Direct Current ◽  
Arc Discharge ◽  
Aerosol Synthesis ◽  
Discharge Method

Efficient Co@CoPx core–shell nanochains catalyst for the oxygen evolution reaction

2018 ◽  
Vol 5 (8) ◽  
pp. 1844-1848 ◽  
Author(s):  
Xiaotao Yuan ◽  
Zhe Zhang ◽  
Zichao Liu ◽  
Xin Wang ◽  
Chenlong Dong ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Direct Current ◽  
Oxygen Evolution Reaction ◽  
Arc Discharge ◽  
Core Shell ◽  
Discharge Method

Co@CoPx core–shell nanochains were prepared via a direct-current arc-discharge method and subsequent phosphorization at 350 °C.

Formation and structure of carbon nanocage structures produced by polymer pyrolysis and electron-beam irradiation

1999 ◽  
Vol 14 (11) ◽  
pp. 4266-4273 ◽  
Author(s):  
Takeo Oku ◽  
Takanori Hirano ◽  
Katsuaki Suganuma ◽  
Satoru Nakajima
Keyword(s):  
Polyvinyl Alcohol ◽  
Structural Model ◽  
Arc Discharge ◽  
Polymer Materials ◽  
Gas Atmosphere ◽  
Carbon Nanocapsules ◽  
Polymer Pyrolysis ◽  
Ar Gas ◽  
Carbon Nanocage ◽  
Discharge Method

Carbon nanocapsules with SiC and Au nanoparticles were produced by thermal decomposition of polyvinyl alcohol at about 500 °C in Ar gas atmosphere. The formation mechanism of nanocapsules and a structural model for the nanocapsule/SiC interface were proposed. In addition, carbon clusters were formed at the surface of carbon nanocapsules, and carbon onions were produced by electron irradiation of amorphous carbon produced from polyvinyl alcohol. The present work indicates that the pyrolysis of polymer materials with clusters is a useful fabrication method for the mass production of carbon nanocapsules and onions at low temperatures compared to the ordinary arc discharge method.

A high-resolution transmission electron microscopy study of defects in γ-Al2O3 nanorods

2007 ◽  
Vol 22 (3) ◽  
pp. 595-602 ◽  
Author(s):  
W.F. Li ◽  
X.L. Ma ◽  
Y. Li ◽  
W.S. Zhang ◽  
Z.D. Zhang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Arc Discharge ◽  
Microscopy Study ◽  
Growth Direction ◽  
Electron Microscopy Study ◽  
Experimental Result ◽  
Transmission Electron ◽  
Discharge Method

Surface and planar defect structures of γ-Al2O3 nanorods synthesized by the arc-discharge method were studied by means of high-resolution transmission electron microscopy and image simulation. Our investigation showed that there was a high number density of twins in the nanorods. We suggested a possible configuration of {111} twins in γ-Al2O3, and this model fit our experimental result well. In some nanorods, the ordering of nanotwins gave rise to a local hexagonal-like structure. The twinned nanorods were usually enclosed by {100} and {111} facets, and their growth direction was changed from 〈110〉 into 〈111〉. The surface structures of the nanorods confirmed that the {111}-type surface should be more stable.

Formation of Single-Walled Carbon Nanotube Buckybooks, Graphene Nanosheets and Metal Decorated Graphene

2018 ◽  
Vol 53 ◽  
pp. 37-53
Author(s):  
Seema Awasthi ◽  
Kalpana Awasthi ◽  
O.N. Srivastava
Keyword(s):  
Carbon Nanostructures ◽  
Arc Discharge ◽  
Graphene Nanosheets ◽  
Metal Nanoparticle ◽  
Step Method ◽  
Single Walled Carbon ◽  
One Step ◽  
Few Layer Graphene ◽  
Walled Carbon Nanotubes ◽  
Discharge Method

The various carbon nanostructures e.g. single-walled carbon nanotubes (SWCNTs) web, graphene nanosheets and metal nanoparticle decorated graphene sheets have been synthesized in large quantity by electrical arc discharge method under an argon atmosphere. The as-synthesized nanostructures were characterized by different characterization techniques such as XRD, SEM, TEM, Energy dispersive X-ray spectroscopy, Raman and FTIR spectroscopy. The SWCNT webs of length ~6 cm abundantly containing aligned SWCNTs have diameter of about 1.8 nm and form buckybook like structure. Few layer graphene (FLG) sheets were prepared by electric arc discharge of high purity graphite electrodes in a varying argon gas atmosphere (250-500T). The largest areal extent of graphene (with lowest number of layer i.e. four) has been found at 350T argon pressure. A one step method is also reported for the decoration of these graphene nanosheets with iron and nickel nanoparticles through arc discharge method.

Production of Silver Nanoparticles Using High Voltage Arc Discharge Method

2016 ◽  
Vol 12 (6) ◽  
pp. 747-753 ◽  
Author(s):  
Marek J. Kasprowicz ◽  
Anna Gorczyca ◽  
Piotr Janas
Keyword(s):  
Silver Nanoparticles ◽  
High Voltage ◽  
Arc Discharge ◽  
Discharge Method
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