Spatially mapping thermal transport in graphene by an opto-thermal method

Braun, Oliver and Furrer, Roman and Butti, Pascal and Thodkar, Kishan and Shorubalko, Ivan and Zardo, Ilaria and Calame, Michel and Perrin, Mickael L.. (2022) Spatially mapping thermal transport in graphene by an opto-thermal method. npj 2D Materials and Applications, 6 (11). p. 6.

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Mapping the thermal transport properties of materials at the nanoscale is of critical importance for optimizing heat conduction in nanoscale devices. Several methods to determine the thermal conductivity of materials have been developed, most of them yielding an average value across the sample, thereby disregarding the role of local variations. Here, we present a method for the spatially resolved assessment of the thermal conductivity of suspended graphene by using a combination of confocal Raman thermometry and a finite-element calculations-based fitting procedure. We demonstrate the working principle of our method by extracting the two-dimensional thermal conductivity map of one pristine suspended single-layer graphene sheet and one irradiated using helium ions. Our method paves the way for spatially resolving the thermal conductivity of other types of layered materials. This is particularly relevant for the design and engineering of nanoscale thermal circuits (e.g. thermal diodes).
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Material Physics (Zardo)
UniBasel Contributors:Zardo, Ilaria
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Publishing Group
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Apr 2022 08:40
Deposited On:13 Apr 2022 08:40

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