Scientists have taken a major step toward building catalysts that work atom by atom with unprecedented control.

Single-atom catalysts are often hailed as the future of cleaner, more efficient chemical reactions.

But making them work outside cryogenic labs has remained a major engineering and materials challenge. Atoms tend to aggregate into clusters the moment temperatures rise, and placing them in precisely tailored chemical environments has been nearly impossible.

Now, an international research team spanning Italy, Japan, and Switzerland has demonstrated a breakthrough method that overcomes both obstacles at once.

Using on-surface synthesis (OSS) guided by atomic-resolution scanning probe microscopy, the scientists have created one-dimensional organic polymers that can selectively anchor metal atoms at uniform, engineered coordination sites.

The result: a tunable, molecule-level architecture that behaves like a synthetic enzyme scaffold—only far more controlled.

Engineered atomic precision

According to the team, this marks the first time a polymer-based structure has been fabricated with periodic side extensions specifically designed to bind single atoms in repeatable positions.

The platform is robust, customizable, and designed to keep each metal atom exposed to reactants, a key requirement for maximum catalytic activity.

Lead author Dr. Marco Di Giovannantonio described the motivation clearly.

“To achieve maximum catalytic efficiency, we must ensure each atom of our catalyst is accessible to reagents – this isn’t possible in bulk materials or clusters, where inner atoms are hidden.”

He added that nature already solves this through enzyme active sites, noting, “Our method opens up a new avenue toward near-enzymatic catalysts, by isolating metal atoms in uniform sites along polymer chains with remarkable stability, even above room temperature.”

The team also highlighted the architecture’s adaptability, which can support different metals and ligands depending on the target reaction.

Stronger bonding behavior

A parallel theoretical study examined how these polymer-bound single atoms interact with key industrial gases. The findings were striking: the structure showed far stronger binding to CO, O₂, and H₂ compared with other common catalyst frameworks.

This enhanced reactivity opens possibilities for studying mechanisms behind major industrial processes, especially those requiring selective stabilization of reaction intermediates.

One immediate area of interest is CO₂ conversion, where single-atom catalysts could guide carbon dioxide toward more valuable chemical outputs with higher precision and lower energy demands.

The conceptual leap extends beyond catalysis.

As Professor Akimitsu Narita noted, “This work not only introduces a new strategy for constructing single-atom catalysts with atomically defined reaction centers, but also lays the foundation for the rational design of organometallic nanomaterials for various future applications.”

With an architecture that finally prevents atoms from clumping, operates above room temperature, and can be engineered site-by-site, researchers say the platform could accelerate the development of next-generation catalytic technologies, including cleaner fuels, greener chemical synthesis, and more efficient industrial conversion pathways.