Stretchable gold conductors bring bling to elastic electronics on CNET:

The precious metal gold can be used for purposes of good (like flexible brain implants) rather than evil (like a $9.4 million iPhone 4S). Researchers at the University of Michigan have created a stretchy conductive material out of gold nanoparticles and polyurethane that holds promise for use in flexible electronic devices.

Once embedded in polyurethane, the spherical gold nanoparticles can conduct electricity, even when the material is stretched out to twice its original length.

The nanoparticles align into a chain form when stretched. “As we stretch, they rearrange themselves to maintain the conductivity, and this is the reason why we got the amazing combination of stretchability and electrical conductivity,” said engineering professor Nicholas Kotov. He likens the material to elastic metal.

The study has been published in the journal Nature under the title “Stretchable Nanoparticle Conductors with Self-Organized Conductive Pathways.”

The researchers see a future for the material in implantable medical devices, especially for brain implants. Other potential applications include flexible screens, wearable technology, and improving lithium-ion batteries. That doesn’t even get into the more mundane possibilities of using the material to unnecessarily bling up iPhones.