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Nanoscale 3D Electroforming by Template Pyrolysis
Author(s) -
Gunderson Christopher,
Rohbeck Nadia,
Tranchant Maxime,
Michler Johann,
Philippe Laetitia
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202001293
Subject(s) - electroforming , materials science , template , photoresist , pyrolysis , nanotechnology , nanoscopic scale , nanocrystalline material , copper , lithography , yield (engineering) , optoelectronics , metallurgy , chemical engineering , layer (electronics) , engineering
A novel approach is demonstrated that extends the resolution of 3D electroforming. Photoresist templates with complex 3D geometries are generated using two‐photon lithography are shrunken by a factor of ≈5 through pyrolysis. A key discovery is that pyrolysis at 500 °C, instead of the higher temperatures normally used for pyrolysis, still shrinks the template by a significant amount but keeps the template nonconductive. This shrunken template is used for electroforming, or template‐assisted electrodeposition, and then etched away to reveal complex 3D structures of pure metal (>99 at%) with linewidths below 200 nm. The versatility of the technique is demonstrated by fabricating octet truss nanolattices from either nanocrystalline gold or microcrystalline copper. In situ micromechanical tests are used as an analytical technique to reveal that these lattices have yield strengths of 325 and 190 MPa for the gold and copper, therefore verifying the fidelity of the architecture.