2021/12/27 by Ting Liang, Liang, Ting, Ke Xu +13
Materials Science · #Computational Physics (physics.comp-ph) #Diamond and Carbon-based Materials Research #FOS: Physical sciences #Graphene research and applications #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Thermal properties of materials
paper · pdf · doi:10.48550/arxiv.2112.13757
openalex publication_date 2021/12/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Fivefold twins (5FTs), discovered nearly 200 years ago, are a common multiply twinned structure that usually dramatically deteriorate the thermal transport properties of nanomaterials. Here, we report the anomalous thermal conductivity (κ) in a novel fivefold twinned diamond nanowires (5FT-DNWs). The κ of 5FT-DNWs is effectively enhanced by the defects of 5FT boundaries, and non-monotonically changes with the cross-sectional area (S). Above the critical S = 7.1 nm2, 5FT-DNWs show a constant value of κ, whereas below it, there appears a sharp increase in κ with decreasing S. More importantly, 5FT-DNWs with minimal S show a superior κ over the bulk diamond. By confirming the Normal-process-dominated scattering event, it is demonstrated that the phonon hydrodynamic behavior plays a determinative role in abnormally high κ of 5FT-DNWs with small S. The super-transported phonon hydrodynamic phenomenon unveiled in the twinned diamond nanowires may provide a new route for pursuing highly thermally conductive nanomaterials.