CE09 - Nanomatériaux et nanotechnologies pour les produits du futur

Enabling Stretchable Metallic Conductors through Atomic Reconfigurations in FCC/BCC Nanolayers – Street ARt Nano

Submission summary

Metallic FCC-BCC nanolayers, such as Cu/Nb, have received wide attention due to their extraordinary mechanical properties as well as the unique self-healing capacities due to the interface characteristics. Most recently, the materials have also been shown to exhibit significant and tunable interfacial sliding mechanisms (based on defect structures in the interface). The significant interfacial sliding is all along while maintaining full contact between the layers, and thus one could expect negligible resistance increase upon straining, which would be attractive for stretchable metallic conductor technology. The interfacial sliding has been modeled with some combination of diffusional and displacive mechanisms - the extreme extents of which are afforded by the nanoscale layering in the materials. The exact mechanisms continue to be fully investigated with in situ mechanical testing allowing the direct observation of the interfacial sliding events inside an SEM (Scanning Electron Microscopy) or on a synchrotron beamline, as well as many other characterization techniques. In this proposal, we aim to harness the unique capacity for atomic reconfigurations in the FCC/BCC nanolayers to enable stretchable metallic conductors. This approach of using atomic reconfigurations (instead of the structural reconfigurations in existing metallic stretchable technologies) is novel and, due to the associated diffusional and displacive mechanisms strictly in the interface (thus maintaining contact all the while), could lead to potentially new, breakthrough metallic stretchable materials - stretchable (and recoverable) without compromising the electrical conductivity upon significant mechanical deformation, as well as upon long operational duration (durability). Stretchable conductors are important part of stretchable electronics, which could lead to many important technologies such as artificial skin, muscle, limb as well as soft robotics and human-machine interfaces.

To accomplish the goals of this project, one needs to make work together experts in mechanics, in situ mechanical testing in SEM or on synchrotron beamlines, characterizing crystal and interfacial defects and stretchable technology. The Street Art Nano project brings together these complementary expertise:

" Prof. Arief Budiman of Singapore University of Technology and Design (SUTD), in Singapore, has a strong background in fracture mechanics, deformation behaviors and microstructure evolution of novel (nanoscale) materials.
" Prof. Olivier Thomas of Aix Marseille Université (AMU) and CNRS (IM2NP UMR 7334), in Marseille, has a strong background on applying X-ray nano-diffraction techniques to understand the mechanics and defect structures of nanoscale materials.
" Prof. Pooi-See Lee of Nanyang Technological University (NTU), in Singapore, has a strong background in novel stretchable materials and technology, and especially in enabling metallic stretchable conductors technology.

Project coordination

Olivier Thomas (Institut des Matériaux, de Microélectronique et des Nanosciences de Provence)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IM2NP Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
NTU Nanyang Technological University
SUTD Singapore University of Technology and Design

Help of the ANR 242,352 euros
Beginning and duration of the scientific project: February 2019 - 36 Months

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