Strong enhancement of electrical conductivity in two-dimensional micrometer-sized RuO₂ nanosheets for flexible transparent electrodes

Abstract

The enhancement in electrical transport properties of exfoliated individual RuO₂ NSs was systemically investigated for their application in flexible electronics and optoelectronics. Decoration of Ag NPs on the surface of the RuO₂ NSs provides donor electrons and dramatically increases the electrical conductivity of the monolayer RuO₂ NSs by up to 3700%. The n-type doping behavior was confirmed via Hall measurement analysis of the doped RuO₂ NSs. The layer number- and temperature-dependence of the conductivity were also investigated. Moreover, carrier concentration and mobility were obtained from Hall measurements, indicating that the undoped RuO₂ NSs had ambipolar transport and semi-metallic characteristics. Moreover, the Ag-doped RuO₂ NS multilayer films on polycarbonate substrates were demonstrated by the Langmuir-Blodgett assembly methods, showing one-third reduction in the sheet resistance and extraordinarily high bending stability that the change in the resistance was less than 1% over 50 000 cycles.