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- W3174204496 abstract "Direct measurements are reported of the thermal conductivity (κ) for gold nanowires and nanoribbons fabricated on a support substrate. Two thickness values of 50 and 100 nm are investigated with lateral dimensions ranging from 74 to 720 nm, thereby spanning the nanowire to nanoribbon scales. Average polycrystalline grain sizes were 27 ± 5 nm for thickness 50 nm and 35 ± 4 nm for 100 nm thickness. Systematic decrease in κ is observed as film thickness is reduced and, for given thickness, as width decreases. At large lateral width studied here, corresponding to the microscale, κ values at room temperature are 280 and 200 W/m K for thicknesses of 100 and 50 nm, respectively. These are to be compared with the accepted value of κ = 317 W/m K for bulk gold. For the smallest case investigated, 50 nm in thickness and 74 nm in width, a value of κ = 56 W/m K is obtained. A small decrease is observed for κ when measured with ambient temperature 100 °C. The systematic dependence on width, for each thickness and both ambient temperatures studied, followed a simple exponential dependence with a characteristic length parameter of ∼150 nm. This length parameter exceeds the accepted electron mean-free path (∼40 nm), the grain sizes, and the film thicknesses. The decrease in κ with diminishing size was examined based on the Boltzmann transport equation (BTE) methods. Agreement and limitations of the BTE are discussed." @default.
- W3174204496 created "2021-07-05" @default.
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- W3174204496 date "2021-06-25" @default.
- W3174204496 modified "2023-09-23" @default.
- W3174204496 title "Direct measurement of thermal conductivity of gold nanowires and nanoribbons at ambient room temperature and 100 °C" @default.
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- W3174204496 doi "https://doi.org/10.1063/5.0054546" @default.
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