Energy considerations regarding pulsed arc production of nanomaterials

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...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2020-07, Vol.128 (3)
Main Authors: Corbella, Carles, Portal, Sabine, Kundrapu, Madhusudhan N., Keidar, Michael
Format: Article
Language:English
Subjects:
Ablative materials
Applied physics
Arc discharges
arc plasma
carbon based materials
Carbon nanotubes
Discharge
Electric arcs
electric discharges
energy balance
ENGINEERING
Graphene
Light distribution
Molybdenum disulfide
Nanomaterials
Nanoparticles
nanotubes
Raman spectroscopy
scanning electron microscopy
Substrates
Thermal analysis
transition metal chalcogenides
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 approximately 1 kW/cm3 characteristic of pulsed arcs (10–20 kW/cm3 in DC) suffices to provide 15 eV/particle to the arc plasma (approximately 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−2 kW h−1. Finally, in situ probe experiments showed that pulsed arcs enhance the transport to the 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.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0015047