While graphene lacks a bandgap, 2D molybdenum disulfide has one naturally.

One-Molecule-Thick Material Has Big Advantages

The molybdenum atoms are teal and the sulfur yellow in the diagram.

...graphene and MoS2 are just the beginning of a new realm of research on two-dimensional materials. "It's the most exciting time for electronics in the last 20 or 30 years," he says. "It's opening up the door to a completely new domain of electronic materials and devices."

Palacios says one potential application of the new material is large-screen displays such as television sets and computer monitors, where a separate transistor controls each pixel of the display. Because the material is just one molecule thick -- unlike the highly purified silicon that is used for conventional transistors and must be millions of atoms thick -- even a very large display would use only an infinitesimal quantity of the raw materials. This could potentially reduce cost and weight and improve energy efficiency.

In the future, it could also enable entirely new kinds of devices. The material could be used, in combination with other 2-D materials, to make light-emitting devices. Instead of producing a point source of light from one bulb, an entire wall could be made to glow, producing softer, less glaring light. Similarly, the antenna and other circuitry of a cellphone might be woven into fabric, providing a much more sensitive antenna that needs less power and could be incorporated into clothing, Palacios says.

The material is so thin that it's completely transparent, and it can be deposited on virtually any other material. For example, MoS2 could be applied to glass, producing displays built into a pair of eyeglasses or the window of a house or office. [emphasis mine]

Tags: molybdenum disulfide (MoS2)

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