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Energy considerations regarding pulsed arc production of nanomaterials

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0015047· OSTI ID:1638740
 [1];  [2];  [3];  [2]
  1. George Washington University, Washington, DC (United States); Tech-X Corporation
  2. George Washington University, Washington, DC (United States)
  3. Tech-X Corporation, Boulder, CO (United States)

Atmospheric arc discharge volumes have been estimated from the light distribution emitted during evaporation of graphite and molybdenum disulphide (MoS2) anodes. These data have been correlated to the peak power in the case of pulsed arc discharge held at different frequencies (1, 2 and 5 Hz). The measured power density values and the corresponding specific energies per particle have been compared to DC values, and showed that pulsed arc discharges deliver electrical power more efficiently than DC arc discharges do with yet lower thermal loads. In particular, the power density of ≈1 kW/cm3 characteristic of pulsed arcs (10-20 kW/cm3 in DC) suffices to provide 15 eV/particle to the arc plasma (≈10 eV/particle or less in DC). Such an energy balance resulted in high ionization rates of the ablated material and production yields of carbon nanotubes around 1011 cm-2kWh-1. Lastly, in situ probe experiments showed that pulsed arcs enhance the transport to substrate of the generated nanoparticles, such as graphene and MoS2 monolayers. Pulsed anodic arcs open the possibility to generate further nanomaterials thanks to a more rational power investment and a better control of the discharge region.

Research Organization:
Tech-X Corporation, Boulder, CO (United States); George Washington University, Washington, DC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation
Grant/Contract Number:
SC0015767
OSTI ID:
1638740
Alternate ID(s):
OSTI ID: 1638760
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 128; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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