Metal nano-dispersions have received tremendous attention for a wide range of applications. Metal oxidation, however, has traditionally restricted the range of useful nano-metals to silver, platinum, palladium and gold. Technical low cost applications such as ink jet printing of flexible conductors and radio frequency identification (RFID) tags, however, require manufacturing costs of typically less than one cent per tag. The most evident candidate to substitute silver or gold would be copper, but nano-copper rapidly oxidizes under ambient conditions. Stabilization of copper nanoparticles by a few graphene layers was realized on a technical scale and enables full protection of the copper metal core up to 200 °C under humid air. The protected copper can then be used in domestic ink jet printers for preparation of conductive patterns.
Features:
• Low-cost copper nanoparticles (scalable process)
• Water-based inks
• Printable by commercial ink-jet printers
• No need for post-treatment
• Electrical conductivity of 100 S/m
• Applications: RFID’s, car back-window heating, low-conduction applications
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