Tuesday , March 9 2021

Thick, stable pieces of graphene produced with a single edge pattern



Different patterns are formed at the edges of the nanogram. Zigzags are particularly interesting and, above all, unstable. The FAU researchers have now managed to create stable carbon layers with this pattern at its edges. Credit: FAU / Konstantin Amsharov

The bay, the fjord, the cove, the armchair and the ziga-zagues use terms such as these to describe the shapes that take the edges of the nano. Graphene consists of a carbon structure of a single layer in which each carbon atom is surrounded by three others. This creates a pattern that reminds a bee honeycomb, with atoms in every corner. Nanographene is a promising candidate for the incorporation of microelectronics into nano-scale and probably a substitute for silicon.


The electronic properties of the material depend to a large extent on its shape, size and, above all, on the periphery, that is, how the edges are structured. A zigzag periphery is especially suitable – in this configuration, the electrons, which act as load carriers, are more mobile than in other edge structures. This means that the use of zigzag graphene pieces in the nanoelectronics components can allow for greater frequencies of switches.

Scientists of materials that want to investigate only the zigzag nanograph face the problem that this way makes the compounds unstable and difficult to produce in a controlled way. This is a prerequisite, however, if the electronic properties are to be investigated in detail.

The researchers led by Dr. Konstantin Amsharov of the Chair of Organic Chemistry II have now managed to do so. Your search has been published in Communications of nature. Not only have they discovered a simple method for synthesizing the zigzag nanometer, its procedure offers a yield close to 100 percent and is suitable for large-scale production. They have already produced a technically relevant amount in the laboratory.

The highly requested zigzag pattern can be found in staggered rows of honeycombs (blue and purple) or four-limb stars that surround a central point of four graffen panels (red and green). Credit: FAU / Konstantin Amsharov

The first researchers produced preliminary molecules, which later unite in honeycomb formation during several cycles in a process known as cyclization. In the end, the graphene fragments are produced from staggered rows of honeycombs or four-point splinters that surround a central point of four graphene flow panels, with the zigzag pattern that is sought at the edges. The product crystallizes directly, even during synthesis. In its solid state, molecules are not in contact with oxygen. However, in the solution, oxidation causes structures to disintegrate quickly.

This approach allows scientists to produce large pieces of graphene, keeping control over their shape and periphery. This advance in the search for graphene means that scientists should soon be able to produce and investigate a variety of interesting nanography structures, a decisive step towards the use of material in nanoelectronic components.


Explore more:
Holé graphene as Holy Grail alternative to silicon chips

More information:
Dominik Lungerich et al, Extension π-dehydratative to nanograms with zigzag edges, Communications of nature (2018). DOI: 10.1038 / s41467-018-07095-z

Journal reference:
Communications of nature

Provided by:
University of Erlangen-Nuremberg


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