Phonon properties in different types of single-walled carbon nanotube thin films probed by Raman spectroscopy
PBN-AR
Instytucja
Wydział Fizyki (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Carbon
ISSN
0008-6223
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
377 - 386
Numer tomu
105
Identyfikator DOI
Liczba arkuszy
0.5
Streszczenia
Język
en
Treść
Abstract We report a temperature-dependent (70–450 K) Raman study of single-walled carbon nanotube (CNT) thin films as a function of their thickness and the conductivity type of the nanotubes used to fabricate these films. The CNT films Raman G mode positions and widths exhibit two apparent regimes, a nonlinear temperature dependence at low temperatures (<270 K), which is explained by the phenomenon of optical phonon decay, and a linear temperature dependence above 270 K. The first-order temperature coefficient, determined for the linear regime, depends on the film thickness and type of CNTs, changed up to 20%. In addition, we observed another factor causing phonon shifts that is not related to the temperature but strongly depend on the film thickness and conductivity type of the CNTs. Finally, we ascertained the local temperature changes of the film samples upon laser heating as a function of the global temperature, demonstrating significant differences in the heating process, suggesting that heat evacuation efficiency depends type of the film, its thickness and global temperature. These results contribute to the understanding of the thermal properties and heat dissipation in CNT films, which are crucial for use in a variety of future applications.
Inne
System-identifier
WUT76d8149ef8524700aae858a3f48392f9
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