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SEM images of the deposited films. (Left) Film 1—a disordered film: φ = 0.24, ν = 125 μm s−1. (Right) Film 3—an ordered film: φ = 0.52, ν = 1500 μm s−1. The scale bar is 1.0 μm.
(Color online) Thermal conductivities of three different films: an ordered film (film 3), a disordered film (film 1), and a moderately ordered/disordered film (film 2) along with the thermal conductivity of bulk, single crystalline TiO2 (Ref. 17), a polycrystalline sputtered film with 17 nm grain size (Ref. 18), and an amorphous TiO2 film (Ref. 19). Representative error bars are shown, which represent the standard deviation calculated from the 5 different measurements on each sample.
(Color online) Thermal conductivity of film 3 (ordered) and film 1 (disordered) as a function of temperature. The temperature trends of the experimental data are different than those predicted by the minimum limit. We model the thermal conductivity of the films by considering Umklapp, impurity and grain boundary scattering, and interparticle thermal boundary resistance. L = 260 nm and L = 48 nm correspond to the length and width of a TiO2 nanoparticle, respectively, and are the bounds on the distance, a phonon can propagate before scattering.
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