Journal Article

PUBDB-2024-04784

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Transient heating of Pd nanoparticles studied by x-ray diffraction with timeof arrival photon detection

Chung, S. (Corresponding author)XFEL.EU*DESY* ; Vonk, V. (Corresponding author)XFEL.EU*DESY* ; Pennicard, D.CFEL*DESY* ; Graafsma, H.CFEL*XFEL.EU*DESY* ; Stierle, A.XFEL.EU*DESY*

2024
AIP Publishing LLC Melville, NY

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Please use a persistent id in citations: doi:10.1063/5.0189052  doi:10.3204/PUBDB-2024-04784

Abstract: Pulsed laser heating of an ensemble of Pd nanoparticles, supported by an MgO substrate, is studied by x-raydiffraction. By time-resolved Bragg peak shift measurements due to thermal lattice expansion, the transienttemperature of the Pd nanoparticles is determined, which quickly rises by at least 100 K upon laser excitationand then decays within 90 ns. The diffraction experiments were carried out using a Cu x-ray tube, givingcontinuous radiation and the hybrid pixel detector Timepix3 operating with single photon counting in a time-of-arrival mode. This type of detection scheme does not require time-consuming scanning of the pump-probedelay. The experimental time resolution is estimated at 15 ± 5 ns, which is very close to the detector’s limitand matches with the 7 ns laser pulse duration. Compared to bulk metal single crystals, it is discussed thatthe maximum temperature reached by the Pd nanoparticles is higher and their cooling rate is lower. Theseeffects are explained by the oxide support having a lower heat conductivity.

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. FS-Detektor Systeme (FS-DS)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. DESY NanoLab: X-Ray Diffraction
2. DESY NanoLab: Microscopy
3. DESY NanoLab: Sample Preparation

Appears in the scientific report 2024

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