Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia.
Nanoscale. 2018 Aug 30;10(34):15948-15955. doi: 10.1039/c8nr04256j.
Thin, skin-conformal, transparent and stretchable energy devices are ideal for powering future wearable and implantable electronics. However, it is difficult to achieve such "unfeelable" and "invisible" devices with traditional materials and design methodologies because of the challenge of simultaneously achieving high optical transparency, high electrical conductivity and high mechanical stretchability. Here, we report a two-step nanowire growth approach for fabricating gold nanorime mesh conductors, enabling skin-thin, transparent and stretchable supercapacitors. Solution-state oleylamine-capped 2 nm-thin gold nanowires self-assemble into highly transparent nanomeshes, which then serve as templates for growing highly conductive vertically aligned nanowires. This two-step solution-plus-surface nanowire growth strategy leads to elastic gold nanorime mesh conductors with an optical transparency up to 90.3% at 550 nm, a low sheet resistance as low as 1.7 ± 0.8 Ω sq-1, and a stretchability of over 100% strain. Such elastic conductors are successfully used to construct symmetrical supercapacitors that can simultaneously achieve high areal capacitance and high stretchability, demonstrating the potential to power future bio-integratable electronics.
薄的、与皮肤贴合的、透明的和可拉伸的能量器件是为未来可穿戴和可植入电子设备供电的理想选择。然而，由于同时实现高光学透明度、高导电性和高机械拉伸性的挑战，传统材料和设计方法很难实现这种“无感”和“隐形”的器件。在这里，我们报告了一种两步纳米线生长方法，用于制造金纳米网导体，从而实现超薄、透明和可拉伸的超级电容器。溶液状态下的油胺封端的 2nm 厚金纳米线自组装成高度透明的纳米网，然后作为生长高度导电的垂直排列纳米线的模板。这种两步溶液加表面纳米线生长策略导致弹性金纳米网导体具有高达 550nm 时 90.3%的透光率、低至 1.7±0.8 Ω sq-1 的低面电阻和超过 100%的拉伸性。这种弹性导体成功地用于构建对称超级电容器，同时实现高面电容和高拉伸性，展示了为未来生物集成电子设备供电的潜力。
