Scientists discover material that can be made like a plastic but conducts like metal
Canadian PlasticsMaterials Research & Development
The team from the University of Chicago has discovered a way to create a material in which the molecular fragments are jumbled and disordered, but can still conduct electricity extremely well.
Scientists with the University of Chicago have discovered a way to create a material that can be made like a plastic, but conducts electricity more like a metal.
The research, published in October in the science journal Nature, shows how to make a kind of material in which the molecular fragments are jumbled and disordered, but can still conduct electricity extremely well.
“In principle, this opens up the design of a whole new class of materials that conduct electricity, are easy to shape, and are very robust in everyday conditions,” said John Anderson, an associate professor of chemistry at the University of Chicago and the senior author on the study.
Conductive materials are absolutely essential if you’re making any kind of electronic device, whether it be an iPhone, a solar panel, or a television. By far the oldest and largest group of conductors is the metals: copper, gold, aluminum. But about 50 years ago, scientists were able to create conductors made out of organic materials, using a chemical treatment known as “doping,” which sprinkles in different atoms or electrons through the material – the advantage being that these materials are more flexible and easier to process than traditional metals. The problem, however, is that they aren’t very stable; they can lose their conductivity if exposed to moisture or if the temperature gets too high.
But fundamentally, both of these organic and traditional metallic conductors share a common characteristic. They are made up of straight, closely packed rows of atoms or molecules. This means that electrons can easily flow through the material, much like cars on a highway. In fact, scientists thought a material had to have these straight, orderly rows in order to conduct electricity efficiently.
The University of Chicago team began experimenting with some materials discovered years ago, but largely ignored, by stringing nickel atoms like pearls into a string of molecular beads made of carbon and sulfur, and began testing; and they were surprised to discover the material easily and strongly conducted electricity. Additionally, it was very stable, which is enormously helpful for a device that has to function in the real world. And perhaps most striking of all, the molecular structure of the material was disordered. “From a fundamental picture, that should not be able to be a metal,” said Anderson. “There isn’t a solid theory to explain this.”
Anderson and his team worked with other scientists around the university to try to understand how the material can conduct electricity. After tests, simulations, and theoretical work, they think that the material forms layers, like sheets in a lasagna. Even if the sheets rotate sideways, no longer forming a neat lasagna stack, electrons can still move horizontally or vertically – as long as the pieces touch. The end result is said to be unprecedented for a conductive material. “It’s almost like conductive Play-Doh—you can smush it into place and it conducts electricity,” Anderson said.
The scientists are enthused because the discovery suggests a fundamentally new design principle for electronics technology. Conductors are so important that virtually any new development opens up new lines for technology, they explained.
One of the material’s attractive characteristics is new options for processing. For example, metals usually have to be melted in order to be made into the right shape for a chip or device, which limits what you can make with them, since other components of the device have to be able to withstand the heat needed to process these materials.
The new material has no such restriction because it can be made at room temperatures. It can also be used where the need for a device or pieces of the device to withstand heat, acid or alkalinity, or humidity has previously limited engineers’ options to develop new technology.
The team is now exploring the different forms and functions the material might make.