Statistical analysis of the temperature dependence of the phonon properties in supported CVD graphene
PBN-AR
Instytucja
Wydział Fizyki (Politechnika Warszawska)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Carbon (40pkt w roku publikacji)
ISSN
0008-6223
EISSN
Wydawca
DOI
URL
Rok publikacji
2017
Numer zeszytu
Strony od-do
1-8
Numer tomu
124
Identyfikator DOI
Liczba arkuszy
0.5
Słowa kluczowe
en
Graphene
Phonons
Statistical methods
Temperature distribution
Thermal expansion
Correlation analysis
Lattice potentials
Non-adiabatic effect
Parameter variability
Phonon properties
Temperature dependence
Temperature derivatives
Uncertainty assessment
Streszczenia
Język
en
Treść
Existing literature reports on the dependence of phonon properties on temperature rarely use statistical analysis. The lack of uncertainty assessment, which takes into account changes in the parameter value within the sample, substantially hinders comparison among the data reported so far. Moreover, it is impossible to determine whether these results display discrepancies between themselves due to sample- and technology-dependent issues, manifestations of statistical noise, or a deeper cause that has not yet been grasped. Here, we show the distributions of the phonon properties at temperatures in the range of 300 K–500 K, which were used to calculate the temperature derivatives of the phonon energies χ. These can be used in the procedure of the extraction of graphene thermal conductivity κ but are also related to the anharmonic part of the graphene crystal lattice potential and/or nonadiabatic effects. Finally, we show that the correlation analyses revealed the existence of an unknown physical cause of differences between χ values, showing that the thermal properties of phonons in graphene are still not fully understood and further studies on the contribution of doping, stress, defects and interaction with the substrate, including its thermal expansion, are required to explain the observed parameter variability.
Inne
System-identifier
WUTe0900a8c5c414a39a713abf0b0bd10bf
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