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Anisotropic Thermal Transport in Tunable Self-Assembled Nanocrystal Supercrystals

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    Anisotropic Thermal Transport in Tunable Self-Assembled Nanocrystal Supercrystals
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    ACS Nano

    Cite this: ACS Nano 2024, 18, 50, 34341–34352
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    https://doi.org/10.1021/acsnano.4c12991
    Published December 6, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    Realizing tunable functional materials with built-in nanoscale heat flow directionality represents a significant challenge that could advance thermal management strategies. Here we use spatiotemporally resolved thermoreflectance to visualize lateral thermal transport anisotropy in self-assembled supercrystals of anisotropic Au nanocrystals. Correlative electron and thermoreflectance microscopy reveal that nano- to mesoscale heat predominantly flows along the long-axis of the anisotropic nanocrystals, and does so across grain boundaries and curved assemblies while voids disrupt heat flow. We finely control the anisotropy via the aspect ratio of constituent nanorods, and it exceeds the aspect ratio for nanobipyramid supercrystals and certain nanorod arrangements. Finite element simulations and effective medium modeling rationalize the emergent anisotropic behavior in terms of a simple series resistance model, further providing a framework for estimating thermal anisotropy as a function of material and structural parameters. Self-assembly of colloidal nanocrystals promises an interesting route to direct heat flow in a wide range of applications that utilize this important class of materials.

    Copyright © 2024 American Chemical Society

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    • Nanocrystal characterization, modulated thermoreflectance imaging of long-range anisotropy, correlative SEM and spatiotemporally resolved thermoreflectance, spatiotemporally resolved thermoreflectance for different nanorod aspect ratios, thermal diffusivity measurement results, estimation of thermal conductivities, finite element simulations of anisotropic thermal transport, effective medium approximation modeling of series resistance, increased thermal transport anisotropy through nanocrystal shape and packing, diffusive hopping model, increased thermal transport anisotropy by decreased side-to-side nanocrystal coupling, and comparison of different ligands (PDF)

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    ACS Nano

    Cite this: ACS Nano 2024, 18, 50, 34341–34352
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.4c12991
    Published December 6, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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