[15p-W9_323-1~12] 22.1 Joint Session M "Phonon Engineering"

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[15p-W9_323-8] Ballistic thermal phonon transport over 40 µm in 10-layer suspended graphene

〇(DC)WenChiao Lin¹, Yunhui Wu¹, Xin Huang¹, Roman Anufriev¹, Masahiro Nomura¹ (1.IIS, Univ. of Tokyo)

Keywords:

graphene,phonons,ballistic transport

Graphene exhibits exceptional thermal properties, making it a promising material for thermal management applications. Understanding its intrinsic heat transport, including thermal coherence and hydrodynamic effects, requires investigations of suspended graphene structures, which remain challenging to fabricate at micrometer scales. In this work, we fabricate suspended graphene ribbons with a thickness of approximately 3 nm and lengths exceeding 40 µm, and characterize their thermal conductivity using micro time-domain thermoreflectance. The ribbons are formed by mechanical exfoliation, gold transducer deposition, oxygen plasma etching, and selective removal of the underlying SiO₂ layer. At 300 K, the normalized thermal resistance per unit area shows a nonlinear dependence on ribbon length, indicating quasi-ballistic heat transport in suspended multilayer graphene.