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. 2021 Feb 19;32(8):085708.
doi: 10.1088/1361-6528/abc9e9.

Phase separated bi-metallic PtNi nanoparticles formed by pulsed laser dewetting

Kangwoo Ahn  1 , Su Yong Lee  2 , In Hwa Cho  1 , Yoonhee Kim  3 , Hyon Chol Kang  4 , Do Young Noh  1
Affiliations

Phase separated bi-metallic PtNi nanoparticles formed by pulsed laser dewetting

Kangwoo Ahn et al. Nanotechnology. .

Abstract

We present morphological and compositional analysis of phase-separated Pt-Ni alloy nanoparticles (NPs) formed by ns pulsed laser dewetting. The PtNi NPs obtained by the pulsed laser dewetting consist of phase-separated multiple domains including Pt3Ni, PtNi and PtNi3 phases with various crystal orientations as revealed by transmission electron microscopy, which is in contrast to thermal dewetting resulting NPs of a uniform composition. A three-dimensional (3D) electron density map of a dewetted PtNi NP obtained using the coherent x-ray diffraction microscopy elucidates the 3D morphology of Pt- and Ni-rich regions together with a nano-cavity formed during the pulsed laser irradiation.

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