ORNL Process Could be White Lightning to Electronics Industry

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A new era of electronics and even quantum devices could be ushered in with the fabrication of a virtually perfect single layer of "white graphene," according to researchers at the Department of Energy's Oak Ridge National Laboratory.

The material, technically known as hexagonal boron nitride, features better transparency than its sister, graphene, is chemically inert, or non-reactive, and atomically smooth. It also features high mechanical strength and thermal conductivity. Unlike graphene, however, it is an insulator instead of a conductor of electricity, making it useful as a substrate and the foundation for the electronics in cell phones, laptops, tablets and many other devices.

"Imagine batteries, capacitors, solar cells, video screens and fuel cells as thin as a piece of paper," said ORNL's Yijing Stehle, postdoctoral associate and lead author of a paper published in Chemistry of Materials. She and colleagues are also working on a graphene hexagonal boron 2-D capacitor and fuel cell prototype that are not only "super thin" but also transparent.

With their recipe for white graphene, ORNL researchers hope to unleash the full potential of graphene, which has not delivered performance consistent with its theoretical value. With white graphene as a substrate, researchers believe they can help solve the problem while further reducing the thickness and increasing the flexibility of electronic devices.

While graphene, which is stronger and stiffer than carbon fiber, is a promising material for data transfer devices, graphene on a white graphene substrate features several thousand times higher electron mobility than graphene on other substrates. That feature could enable data transfers that are much faster than what is available today. "Imagine your message being sent thousands of times faster," Stehle said.

Stehle noted that this work is especially significant because it takes the material beyond theory. A recent theoretical study led by Rice University, for instance, proposed the use of white graphene to cool electronics. Stehle and colleagues have made high-quality layers of hexagonal boron nitride they believe can be cost-effectively scaled up to large production volumes.

"Various hexagonal boron nitride single crystal morphology - triangle to hexagon - formulations have been mentioned in theoretical studies, but for the first time we have demonstrated and explained the process," Stehle said.

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