Through-Plane and In-Plane Thermal Diffusivity Determination of Graphene Nanoplatelets by Photothermal Beam Deflection Spectrometry

被引:14
|
作者
Cabrera, Humberto [1 ]
Korte, Dorota [2 ]
Budasheva, Hanna [2 ]
Abbasgholi N. Asbaghi, Behnaz [1 ]
Bellucci, Stefano [3 ]
机构
[1] Abdus Salam Int Ctr Theoret Phys, Opt Lab, STI Unit, Str Costiera 11, I-34151 Trieste, Italy
[2] Univ Nova Gorica, Lab Environm & Life Sci, Vipavska 13, SI-5000 Nova Gorica, Slovenia
[3] Ist Nazl Fis Nucl, Lab Nazl Frascati, Via Fermi 54, I-00044 Frascati, Italy
关键词
graphene nanoplatelets; thermal diffusivity; thermal conductivity; photothermal spectrometry; THIN-FILMS; CONDUCTIVITY;
D O I
10.3390/ma14237273
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, in-plane and through-plane thermal diffusivities and conductivities of a freestanding sheet of graphene nanoplatelets are determined using photothermal beam deflection spectrometry. Two experimental methods were employed in order to observe the effect of load pressures on the thermal diffusivity and conductivity of the materials. The in-plane thermal diffusivity was determined by the use of a slope method supported by a new theoretical model, whereas the through-plane thermal diffusivity was determined by a frequency scan method in which the obtained data were processed with a specifically developed least-squares data processing algorithm. On the basis of the determined values, the in-plane and through-plane thermal conductivities and their dependences on the values of thermal diffusivity were found. The results show a significant difference in the character of thermal parameter dependence between the two methods. In the case of the in-plane configuration of the experimental setup, the thermal conductivity decreases with the increase in thermal diffusivity, whereas with the through-plane variant, the thermal conductivity increases with an increase in thermal diffusivity for the whole range of the loading pressure used. This behavior is due to the dependence of heat propagation on changes introduced in the graphene nano-platelets structure by compression.
引用
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页数:17
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