Wang Yan, Gong Shu, Gómez Daniel, Ling Yunzhi, Yap Lim Wei, Simon George P, Cheng Wenlong
Department of Chemical Engineering , Monash University , Clayton , Victoria 3800 , Australia.
Applied Chemistry and Environmental Sci , RMIT University , Melbourne , Victoria 3000 , Australia.
ACS Nano. 2018 Aug 28;12(8):8717-8722. doi: 10.1021/acsnano.8b04748. Epub 2018 Jul 26.
We report on unconventional Janus material properties of vertically aligned gold nanowire films that conduct electricity and interact with light and water in drastically different ways on its two opposing sides. These Janus-like properties originate from enokitake-like nanowire structures, causing the nanoparticle side ("head") to behave like bulk gold, yet the opposing nanowire side ("tail") behaves as discontinuous nanophases. Due to this Janus film structure, its head side is hydrophilic but its tail side is hydrophobic; its head side reflects light like bulk gold, yet its tail side is a broadband superabsorber; its tail side is less conductive but with tunable resistance. More importantly, the elastomer-bonded Janus film exhibits unusual mechatronic properties when being stretched, bent, and pressed. The tail-bonded elastomeric sheet can be stretched up to ∼800% strain while remaining conductive, which is about 10-fold that of head-bonded film. In addition, it is also more sensitive to bending forces and point loads than the corresponding tail-bonded film. We further demonstrate the versatility of nanowire-based Janus films for pressure sensors using bilayer structures in three different assembly layouts.
我们报道了垂直排列的金纳米线薄膜具有非常规的双面材料特性，该薄膜在其两个相对面上以截然不同的方式导电、与光和水相互作用。这些类双面特性源自金针菇状的纳米线结构，使得纳米颗粒一侧（“头部”）表现得像块状金，而相对的纳米线一侧（“尾部”）则表现为不连续的纳米相。由于这种双面薄膜结构，其头部一侧亲水而尾部一侧疏水；其头部一侧像块状金一样反射光，而其尾部一侧是宽带超级吸收体；其尾部一侧导电性较差但电阻可调。更重要的是，弹性体粘结的双面薄膜在拉伸、弯曲和按压时表现出不同寻常的机电特性。尾部粘结的弹性体片材在保持导电的同时可拉伸至约800%的应变，这约为头部粘结薄膜的10倍。此外，它对弯曲力和点载荷也比相应的头部粘结薄膜更敏感。我们还通过三种不同组装布局的双层结构展示了基于纳米线的双面薄膜在压力传感器方面的多功能性。
