Laser-induced light emission from carbon nanoparticles

Strong absorption of light in a broad wavelength range and poor thermal conductance between particles of carbon nanomaterials, such as nanotubes, onions, nanodiamond, and carbon black, lead to strong thermal emission (blackbody radiation) upon laser excitation, even at a very low (milliwatts) power....

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Bibliographic Details
Published in:Journal of applied physics 2008-10, Vol.104 (7), p.074308-074308-7
Main Authors: Osswald, S., Behler, K., Gogotsi, Y.
Format: Article
Language:English
Subjects:
ABSORPTION
BLACKBODY RADIATION
CARBON BLACK
EMISSION SPECTRA
EVAPORATION
GRAPHITE
GRAPHITIZATION
HEATING
LASERS
LEAD
MATERIALS SCIENCE
NANOTUBES
PARTICLES
PHOTOLUMINESCENCE
RAMAN SPECTRA
RAMAN SPECTROSCOPY
TEMPERATURE RANGE 1000-4000 K
THERMAL CONDUCTIVITY
VISIBLE RADIATION
WAVELENGTHS
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Summary:Strong absorption of light in a broad wavelength range and poor thermal conductance between particles of carbon nanomaterials, such as nanotubes, onions, nanodiamond, and carbon black, lead to strong thermal emission (blackbody radiation) upon laser excitation, even at a very low (milliwatts) power. The lasers commonly used during Raman spectroscopy characterization of carbon can cause sample heating to very high temperatures. While conventional thermometry is difficult in the case of nanomaterials, Raman spectral features, such as the G band of graphitic carbon and thermal emission spectra were used to estimate the temperature during light emission that led to extensive graphitization and evaporation of carbon nanomaterials, indicating local temperatures exceeding 3500 ° C .
ISSN:0021-8979
1089-7550
DOI:10.1063/1.2980321