@misc{jeon_effects_of_2024, 
author={Jeon, H., Markmann, J., Shi, S.},
title={Effects of structural hierarchy and size on mechanical behavior of nanoporous gold},
year={2024},
howpublished = {journal article},
doi = {https://doi.org/10.1016/j.actamat.2024.119954},
abstract = {Nanoporous gold with a hierarchical structure has prospects as an advanced functional material with enhanced mechanical properties, but how the hierarchical structure affects its mechanical properties compared to a unimodal structure has not been revealed. Here, we investigate the mechanical behavior of hierarchically-structured nanoporous gold and unimodally-structured nanoporous gold with the same relative density by micropillar compressive tests in dry and electrolyte environment. The ligament size at the upper-level structure in hierarchically-structured nanoporous gold and the ligament size in unimodally-structured nanoporous gold are kept similar, while having hierarchically-structured samples with ligament sizes of 10 to 50 nm at lower-level structure. We find that hierarchically-structured nanoporous gold shows greater compressive strength and pronounced stress-variation by oxidization of the surface compared to unimodally-structured nanoporous gold. A ligament-size dependency on the lower-level structure in hierarchical samples is observed, with compressive strength and stress variation by surface oxidation increasing as the lower-level ligament size decreases. Three-dimensionally reconstructed structure analysis suggests that the enhanced mechanical properties of hierarchically-structured nanoporous gold are attributed to the better-connected network of ligaments originating from two separated dealloying-coarsening procedures. The influence of dislocation activities depending on characteristic sizes is also discussed to elucidate the distinguished mechanical behavior.},
note = {Online available at: \url{https://doi.org/10.1016/j.actamat.2024.119954} (DOI). Jeon, H.; Markmann, J.; Shi, S.: Effects of structural hierarchy and size on mechanical behavior of nanoporous gold. Acta Materialia. 2024. vol. 273, 119954. DOI: 10.1016/j.actamat.2024.119954}}