Building electronic materials atom by atom has long been a goal in nanotechnology. Now, an international research team has taken a major step toward that future by developing ultra-thin molecular chains whose electronic behavior can be carefully programmed during construction.

The research, led by scientists from the University of Birmingham and the University of Warwick, puts the spotlight on nanoribbons—extremely narrow molecular strips only a few atoms across. Unlike conventional approaches that modify existing materials, the team created these structures by combining molecules that either donate or accept electrons.

This approach provides scientists with a powerful new way to tailor the behavior of electronic materials at the smallest possible scale.

Professor Giovanni Costantini, corresponding author of the study, explained:

"While atomically precise nanoribbons have been explored before, this is the first time they have been built by directly combining electron donor and acceptor units. Because we can choose exactly where these units appear, we can design their electronic properties in advance and realise them with atomic precision.”

He added:

"By controlling the sequence and length of the molecular units, we can precisely programme and realise the material's electronic properties in practice – paving the way for an unprecedented level of control essential for next-generation technologies."

The team used donor-acceptor chemistry, a concept already used in advanced electronic polymers. To construct the materials, specially designed donor and acceptor molecules were placed on a gold surface under vacuum conditions and heated. 

As the molecules reacted, they linked together into molecular chains, forming various ribbon structures with different electronic characteristics.

Using advanced imaging techniques capable of resolving individual atoms and chemical bonds, they closely examined how the nanoribbons formed and how electrons behaved within them. These observations revealed that the electronic performance of the materials depended heavily on the exact order and length of the molecular building blocks.

The team also created a theoretical model that can predict how changes in a molecule's arrangement influence its electronic patterns. This model serves as a guide for developing future materials.

Professor Davide Bonifazi highlighted the significance of the fabrication method, saying:

"By embedding donor–acceptor concepts into these on-surface fabrication strategies it became possible to prepare extended nanoribbon structures that are otherwise difficult to make in solution."

These atomically engineered materials could contribute to flexible electronics that are printed directly onto fabrics, ultra-compact circuits for Internet of Things devices, advanced sensors, improved solar cells, and bioelectronic systems designed for medical implants.

Read the full article here to learn more about these nanoribbons.

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