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Scientists Innovate by Incorporating Coal into Electronics, Creating Next-Generation Devices with Surprising Advantages.
Carbon, the foundation of life on Earth, is gaining prominence in the world of electronics. An example of this is graphene, a sheet made up of a single layer of carbon atoms, and graphite, an infinite cluster of graphene sheets, which can explain many of the behaviors of this material. Its easily sliding sheets explain how pencil graphite spreads smoothly on paper and its function as an excellent lubricant. Now, researchers are exploring the use of coal in electronics to create futuristic devices.
Understand How Coal Works in Electronics and Its Importance
Coal, although also primarily made up of carbon, is something entirely different. This material is a shapeless mass of carbon without any structure and full of other contaminating elements.
To give an idea, one only needs to remember that coal and graphite are mineralogically different species. It is even possible to make graphite from coal; however, the work and final quality are not worth it. Thus, researcher Fufei An and colleagues from the University of Illinois Urbana-Champaign in the United States managed to produce electronic components for next-generation devices using only coal.
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According to Professor Qing Cao, coal is generally considered bulky and dirty; however, the processing techniques they developed can transform it into high-purity materials with only a few atoms in thickness.
The professor explains that its unique atomic structures and properties are ideal for producing some of the smallest possible electronic components, with performance surpassing the state of the art.
Process Carried Out by Researchers to Use Coal in Electronics
The process developed by the team to utilize coal in electronics first converts the material into nanoscale carbon discs called carbon dots, which can be connected to form atomically thin membranes.
These membranes are perfect for functioning as two-dimensional transistors and even as memristors, the artificial neurons of the growing neuromorphic computing, which mimics the human brain. In the search for smaller, faster, and more efficient devices in electronics, the definitive step will be components developed with materials only one or two atoms thick.
Although ultrathin semiconductors have been extensively studied, it is also necessary to have atomically thin insulators, materials that block the flow of electric current, to develop transistors and memristors.
In practice, what the researchers demonstrated was that atomically thin layers of carbon, with disordered atomic structures, can function as excellent insulators for the construction of two-dimensional electronic components. These carbon layers are formed from carbon dots derived from coal.
According to Cao, it is truly exciting, as this is the first time that coal, something considered low-tech, is directly linked to the forefront of microelectronics.
Coal in Electronics Can Be Twice as Fast
The researchers used carbon layers derived from coal as gate dielectrics in two-dimensional transistors built with the semimetal graphene and molybdenite (molybdenum disulfide), achieving an operating speed more than twice as fast and with lower power consumption.
Like other atomically thin materials, the carbon layers derived from coal do not have “dangling bonds,” electrons that are not associated with a chemical bond.
These sites, which are abundant on the surfaces of conventional three-dimensional insulators, alter their electrical properties, effectively functioning as traps, slowing the transport of electric charges and thereby the switching speed of the transistor.
However, unlike other atomically thin materials, the new carbon layers derived from coal are amorphous, meaning they do not have a regular crystalline structure; therefore, they do not have boundaries between different crystalline regions that serve as conduction pathways leading to leakage, where unwanted electric currents flow through the insulator and cause substantial additional energy consumption during component operations.
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