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

Ashutosh Giri*, Janne-Petteri Niemelä, Chester J. Szwejkowski, Maarit Karppinen, Patrick E. Hopkins

*Tämän työn vastaava kirjoittaja

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    22 Sitaatiot (Scopus)
    195 Lataukset (Pure)

    Abstrakti

    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 TiO2- 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.

    AlkuperäiskieliEnglanti
    Artikkeli024201
    Sivumäärä7
    JulkaisuPhysical Review B
    Vuosikerta93
    Numero2
    DOI - pysyväislinkit
    TilaJulkaistu - 11 tammikuuta 2016
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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