CITIR Murat Abdullah Gul University

Experimental Methods for Thin Layer Coating of Metal Nanowires with Inert Metals

Co-authors CANLIER Ali, SEN Unal, USTA Hakan

Metal nanowire (NW) films are recently studied as transparent electrodes for flexible display applications. On account of both high conductivity and persistence against bending, metal nanowires of copper and silver proved suitable for these applications. Silver and copper can form nanowires of high aspect ratio; whereas making nanowires of inert metals (gold, platinum, palladium) is relatively difficult and material cost rises if whole nanowire is composed of these. In order to exploit their surface physics and chemistry, it is more cost-effective to make cheap metal/inert metal core/shell nanowires. However, uniform coating of large-scale nanowire system is not easy. We propose to coat metal nanowires with a thin shell of heavier metals, which are inert against oxidation and sulfurization. Coatings can be implemented efficiently and uniformly in two methods: portionwise and biphasic titration. Metal (Au, Pt, Pd) salts can be used as galvanic exchange agents for oxidation and substitution of a thin layer of copper and silver. This will provide with passivation of copper and silver against most chemical changes. Another advantage of thin layer coating is the exploitation of differences in optical parameters of those metals. Acknowledgment: We would like to thank TUBITAK for supporting this work by funding our projects (contract numbers: 112M572, 113C003).