Journal
NPG ASIA MATERIALS
Volume 15, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41427-023-00483-y
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This work aims to develop a facile method for the fabrication of metallic mechanical metamaterial with a well-ordered diamond structure. By controlling the effective volume fraction of PDMS in PS-b-PDMS, nanoporous PS with diamond-structured nanochannels can be obtained and used as a template for templated electrochemical deposition. The resulting diamond-structured Au exhibits lightweight and mechanically robust characteristics with high elastic modulus and yield strength.
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 & PLUSMN; 0.6 GPa and yield strength of 193 & PLUSMN; 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.
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