Time Resolved Study of Laser Induced Ultrafast Alloying Processes in Au/Pd Core Shell Nanorods
Abstract
Femtosecond laser-induced alloying presents a novel approach to modifying bimetallic systems. Visualizing ultrafast processes during laser-induced alloying is essential to uncover fundamental mechanisms associated with phase transformations, which enables precise control over material composition and structure at the atomic level. In this study, we investigated the ultrafast dynamics of laser-induced alloying of Au/Pd core-shell nanorods using a time-resolved X-ray diffraction technique at an X-ray free-electron laser facility, capturing the structural evolution from picoseconds to microsecond timescales. We found that a laser fluence threshold of ~ 48 mJ/cm2 with 800 nm excitation is sufficient for melting and subsequent alloy formation. Above this threshold, the formation of Au1.51Pd0.49 was observed, and we found that alloying is not a single-step phenomenon; instead, it is a dynamic process involving interdiffusion.
Cite
@article{arxiv.2603.01597,
title = {Time Resolved Study of Laser Induced Ultrafast Alloying Processes in Au/Pd Core Shell Nanorods},
author = {Abhisakh Sarma and Jayanath C. P. Koliyadu and Romain Letrun and Egor Sobolev and Trupthi Devaiah C and Agnieszka Wrona and Katerina Doerner and Diogo V. M. Melo and Marco Kloos and Huijong Han and Marcin Sikorski and Konstantin Kharitonov and Juncheng E and Joana Valerio and Pralay K. Santra and Erik M. J. Johansson and Richard Bean and Chan Kim and Tokushi Sato},
journal= {arXiv preprint arXiv:2603.01597},
year = {2026}
}
Comments
The submission consists of a single PDF file containing both the main text and the Supporting Information. The main text includes 20 pages and 5 figures, while the Supporting Information comprises 21 pages and 10 figures