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Article Dans Une Revue Nano Letters Année : 2021

Nanoscale Disorder Generates Subdiffusive Heat Transport in Self-Assembled Nanocrystal Films

Aditya Sood
Igor Coropceanu
Burak Guzelturk
Dmitri Talapin
Aaron Lindenberg
Naomi Ginsberg

Résumé

Investigating the impact of nanoscale heterogeneity on heat transport requires a spatiotemporal probe of temperature on the length and time scales intrinsic to heat navigating nanoscale defects. Here, we use stroboscopic optical scattering microscopy to visualize nanoscale heat transport in disordered films of gold nanocrystals. We find that heat transport appears subdiffusive at the nanoscale. Finite element simulations show that tortuosity of the heat flow underlies the subdiffusive transport, owing to a distribution of nonconductive voids. Thus, while heat travels diffusively through contiguous regions of the film, the tortuosity causes heat to navigate circuitous pathways that make the observed mean-squared expansion of an initially localized temperature distribution appear subdiffusive on length scales comparable to the voids. Our approach should be broadly applicable to uncover the impact of both designed and unintended heterogeneities in a wide range of materials and devices that can affect more commonly used spatially averaged thermal transport measurements.
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Dates et versions

hal-03513749 , version 1 (03-11-2022)

Identifiants

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James Utterback, Aditya Sood, Igor Coropceanu, Burak Guzelturk, Dmitri Talapin, et al.. Nanoscale Disorder Generates Subdiffusive Heat Transport in Self-Assembled Nanocrystal Films. Nano Letters, 2021, 21 (8), pp.3540-3547. ⟨10.1021/acs.nanolett.1c00413⟩. ⟨hal-03513749⟩
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