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Keywords = synchrotron pump-probe powder scattering

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17 pages, 788 KiB  
Article
Structural and Thermal Characterisation of Nanofilms by Time-Resolved X-ray Scattering
by Anton Plech, Bärbel Krause, Tilo Baumbach, Margarita Zakharova, Soizic Eon, Caroline Girmen, Gernot Buth and Hartmut Bracht
Nanomaterials 2019, 9(4), 501; https://doi.org/10.3390/nano9040501 - 1 Apr 2019
Cited by 6 | Viewed by 4831
Abstract
High time resolution in scattering analysis of thin films allows for determination of thermal conductivity by transient pump-probe detection of dissipation of laser-induced heating, TDXTS. We describe an approach that analyses the picosecond-resolved lattice parameter reaction of a gold transducer layer on pulsed [...] Read more.
High time resolution in scattering analysis of thin films allows for determination of thermal conductivity by transient pump-probe detection of dissipation of laser-induced heating, TDXTS. We describe an approach that analyses the picosecond-resolved lattice parameter reaction of a gold transducer layer on pulsed laser heating to determine the thermal conductivity of layered structures below the transducer. A detailed modeling of the cooling kinetics by a Laplace-domain approach allows for discerning effects of conductivity and thermal interface resistance as well as basic depth information. The thermal expansion of the clamped gold film can be calibrated to absolute temperature change and effects of plastic deformation are discriminated. The method is demonstrated on two extreme examples of phononic barriers, isotopically modulated silicon multilayers with very small acoustic impedance mismatch and silicon-molybdenum multilayers, which show a high resistivity. Full article
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