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Strong, Ductile, and Tough Nanocrystal-Assembled Freestanding Gold Nanosheets.

Qing YuJingyang ZhangJia LiTianyu WangMinhyuk ParkQuanfeng HeZhibo ZhangTao LiangXue DingYang Yang LiQing WangQiaoshi ZengYong Yang
Published in: Nano letters (2022)
The structural and mechanical properties of low-dimensional nanostructured metals have been attracting tremendous interest in the fast-growing fields of nanosciences and nanotechnologies. However, it still remains a challenge today to develop strong yet ductile low-dimensional metals that can support the further development of nanodevices. Here, through the polymer-assisted assembly of gold nanocrystals, we successfully fabricated the freestanding, ultrathin gold nanomaterial. Unlike conventional bulk gold or other low-dimensional gold nanostructures (i.e., nanowires and nanosheets), these gold nanosheets are composed of highly distorted gold nanocrystals that are 3-5 nm in size, which are joined together through nanosized amorphous carbon interphases. As a result, the gold nanosheets exhibit superb strength (up to 1.2 GPa), excellent ductility (>50%), and superior fracture toughness (>100 J/m 2 ), outperforming various gold nanostructures hitherto reported.
Keyphrases
  • silver nanoparticles
  • reduced graphene oxide
  • room temperature
  • quantum dots
  • metal organic framework
  • heavy metals
  • highly efficient
  • gold nanoparticles
  • high efficiency