Luechinger Norman A, Athanassiou Evagelos K, Stark Wendelin J
Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland.
Nanotechnology. 2008 Nov 5;19(44):445201. doi: 10.1088/0957-4484/19/44/445201. Epub 2008 Sep 26.
Metallic copper nanoparticles were synthesized by a bottom-up approach, and in situ coated with protective shells of graphene in order to get a metal nanopowder of high air stability and chemical inertness. Using an amphiphilic surfactant, a water-based copper nanocolloid could be prepared and successfully printed onto a polymer substrate by conventional ink-jet printing using household printers. The dried printed patterns exhibited strong metallic gloss and an electrical conductivity of >1 S cm(-1) without the need for a sintering or densification step. This conductivity currently limits use in electronics to low current application or shielding and decorative effects. The high stability of graphene-coated copper nanoparticles makes them economically a most attractive alternative to silver or gold nanocolloids, and will strongly facilitate the industrial use of metal nanocolloids in consumer goods.
通过自下而上的方法合成了金属铜纳米颗粒，并原位包覆石墨烯保护壳，以获得具有高空气稳定性和化学惰性的金属纳米粉末。使用两亲性表面活性剂，可以制备水基金属铜纳米胶体，并通过家用打印机采用传统喷墨印刷成功地将其印刷到聚合物基板上。干燥后的印刷图案呈现出强烈的金属光泽，电导率>1 S cm(-1)，无需烧结或致密化步骤。目前，这种电导率限制了其在电子领域仅用于低电流应用或屏蔽及装饰效果。石墨烯包覆的铜纳米颗粒的高稳定性使其在经济上成为银或金纳米胶体最具吸引力的替代品，并将极大地促进金属纳米胶体在消费品中的工业应用。
