https://scholars.lib.ntu.edu.tw/handle/123456789/634101
Title: | Diamond-structured nanonetwork gold as mechanical metamaterials from bottom-up approach | Authors: | Siddique, Suhail K. Sadek, Hassan Wang, Chi Wei Lee, Chang Chun Tsai, Cheng Yuan Chang, Shou Yi Li, Chia Lin CHUN-HWAY HSUEH Ho, Rong Ming |
Issue Date: | 1-Dec-2023 | Journal Volume: | 15 | Journal Issue: | 1 | Source: | NPG Asia Materials | Abstract: | Herein, this work aims to develop a facile method for the fabrication of metallic mechanical metamaterial with a well-ordered diamond structure from a bottom-up approach using a self-assembled block copolymer for templated electrochemical deposition. By controlling the effective volume fraction of PDMS in PS-b-PDMS via solvent annealing followed by HF etching of PDMS, it is feasible to obtain nanoporous PS with diamond-structured nanochannels and used it as a template for templated electrochemical deposition. Subsequently, well-ordered nanonetwork gold (Au) can be fabricated. As evidenced by nanoindentation and micro-compression tests, the mechanical properties of the diamond-structured Au after removal of PS give the combination of lightweight and mechanically robust characteristics with an exceptionally high reduced elastic modulus of 11.9 ± 0.6 GPa and yield strength of 193 ± 11 MPa above the Hashin-Shtrikman upper bound of 72 MPa with a bending-dominated structure at equivalent density. The corresponding deformation mechanism can be elucidated by morphological observations experimentally and finite element analysis (FEA) numerically. This work demonstrates the bottom-up approach to fabricating metallic monolith with diamond structure in the nanoscale, giving a superior performance as mechanical metamaterials. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/634101 | ISSN: | 18844049 | DOI: | 10.1038/s41427-023-00483-y |
Appears in Collections: | 材料科學與工程學系 |
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