Athanassiou E K, Krumeich F, Grass R N, Stark W J
Institute for Chemical and Bioengineering, ETH Zürich, Zurich, Switzerland.
Phys Rev Lett. 2008 Oct 17;101(16):166804. doi: 10.1103/PhysRevLett.101.166804. Epub 2008 Oct 16.
Assembled metal-insulator nanoparticles with a core-shell geometry provide access to materials containing a large number (>10(6)) of tunneling barriers. We demonstrate the production of ceramic coated metal nanoparticles exhibiting an exceptional pressure-sensitive conductivity. We further show that graphene bi- and trilayers on 20 nm copper nanoparticles are insulating in such a core-shell geometry and show a similar pressure-dependent conductivity. This demonstrates that core-shell metal-insulator assemblies offer a route to alternative sensing materials.
具有核壳结构的组装金属-绝缘体纳米颗粒可用于制备包含大量（>10⁶）隧道势垒的材料。我们展示了具有异常压敏导电性的陶瓷包覆金属纳米颗粒的制备。我们进一步表明，在20纳米铜纳米颗粒上的石墨烯双层和三层在这种核壳结构中是绝缘的，并表现出类似的压力依赖性导电性。这表明核壳金属-绝缘体组件为替代传感材料提供了一条途径。
