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Reduction in thermal conductivity and tunable heat capacity of inorganic/organic hybrid superlattices

机译：降低无机/有机杂化超晶格的热导率和可调节的热容量

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摘要

We study the influence of molecular monolayers on the thermal conductivities and heat capacities of hybrid inorganic/organic superlattice thin films fabricated via atomic/molecular layer deposition. We measure the cross plane thermal conductivities and volumetric heat capacities of TiO_(2-) and ZnO-based superlattices with periodic inclusion of hydroquinone layers via time domain thermoreflectance. In comparison to their homogeneous counterparts, the thermal conductivities in these superlattice films are considerably reduced. We attribute this reduction in the thermal conductivity mainly due to incoherent phonon boundary scattering at the inorganic/organic interface. Increasing the inorganic/organic interface density reduces the thermal conductivity and heat capacity of these films. High-temperature annealing treatment of the superlattices results in a change in the orientation of the hydroquinone molecules to a 2D graphitic layer along with a change in the overall density of the hybrid superlattice. The thermal conductivity of the hybrid superlattice increases after annealing, which we attribute to an increase in crystallinity.
机译：我们研究了分子单分子层对通过原子/分子层沉积制备的无机/有机超晶格杂化薄膜的热导率和热容量的影响。我们通过时域热反射法测量了周期性包含氢醌层的TiO_（2-）和ZnO基超晶格的横断面热导率和体积热容。与它们的均匀对应物相比，这些超晶格薄膜中的热导率大大降低。我们将这种热导率的降低归因于无机/有机界面处非相干声子边界散射。增加无机/有机界面密度会降低这些薄膜的热导率和热容。超晶格的高温退火处理导致对苯二酚分子相对于2D石墨层的取向变化以及混合超晶格的整体密度变化。退火后，混合超晶格的热导率增加，这归因于结晶度的增加。

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  • 来源
    《Physical review》 |2016年第2期|024201.1-024201.7|共7页
  • 作者

    Ashutosh Giri; Janne-Petteri Niemelae; Chester J. Szwejkowski; Maarit Karppinen; Patrick E. Hopkins;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA;

    Department of Chemistry, Aalto University, FI-00076 Aalto, Finland;

    Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA;

    Department of Chemistry, Aalto University, FI-00076 Aalto, Finland;

    Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA;

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