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Abstract
We studied the variation in electrical conductivity of exfoliated RuO2 nanosheets and the modulation in the contact resistance of individual nanosheet devices using charge transfer doping effects based on surface metal nanoparticle decorations. The electrical conductivity in the monolayer and bilayer RuO2 nanosheets gradually increased due to the surface decoration of Cu, and subsequently Ag, nanoparticles. We obtained contact resistances between the nanosheet and electrodes using the four-point and two-point probe techniques. Moreover, the contact resistances decreased during the surface decoration processes. We established that the surface decoration of metal nanoparticles is a suitable method for external contact engineering and the modulation of the internal properties of nanomaterials.
Highlights
Accepted: 16 September 2021Numerous researchers have focused on studying two-dimensional (2D) materials since Novoselov and Geim first demonstrated the unique physical properties of graphene, which is a single layer of carbon [1,2]
RuO2 nanosheets due to the surface decoration treatment using Cu-nanoparticles followed by Ag-nanoparticles
We analyzed the changes in electrical conductivity and contact resistance of RuO2 nanosheets using charge transfer effects based on and surface metal nanoparticle decWe analyzed the changes in doping electrical conductivity contact resistance of RuO
Summary
Numerous researchers have focused on studying two-dimensional (2D) materials since Novoselov and Geim first demonstrated the unique physical properties of graphene, which is a single layer of carbon [1,2]. Ruthenium oxide (RuO2 ) nanosheets have a rutile structure and metallic characteristics as a bulk crystal. RuO2 nanosheets can be used as a flexible transparent conducting material with high thermodynamic stability [23,24]. The crystal structure and physical properties of individual monolayer RuO2 nanosheets were first studied using the potassium-intercalated
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