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Study from Tulane University shows that atoms on the surface of gold can reorganize and form a barrier against oxygen, reducing reactions on a billion-scale and helping to explain why the metal maintains its shine for so long.
Gold can maintain its shine for centuries not only due to its known low tendency to react with oxygen but also because of an invisible mechanism on its surface. Research from Tulane University indicates that surface atoms of the metal reorganize and create a barrier on an atomic scale.
The study, published in the journal Physical Review Letters, analyzed two common structures on the surface of gold. The conclusion is that these rearrangements hinder oxidation, a process that usually alters the appearance and properties of many materials exposed to air.
Gold atoms form an invisible protection
The traditional explanation for gold’s resistance has always been linked to chemistry: the metal does not interact strongly with oxygen. The new research adds an important layer to this interpretation by showing that the geometry of the atoms also plays a decisive role.
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Matthew Montemore, associate professor of Chemical Engineering at Tulane’s School of Science and Engineering, stated that, in two common types of surfaces, the atoms rearrange in a way that makes gold much more resistant to oxidation.
This behavior helps explain why jewelry, ancient objects, and other items made of gold can preserve their shine and natural appearance for extremely long periods. The protection is not visible to the naked eye but acts precisely at the point where the metal meets oxygen.
Simulations showed a billion-scale drop in reactions
Montemore and Santu Biswas, postdoctoral fellow at Tulane’s Department of Chemical and Biomolecular Engineering, used computational simulations to observe how atoms and electrons behave when oxygen molecules encounter gold surfaces.
The results indicated that oxygen molecules would separate and react with the metal much more easily if the surface atoms remained without reorganization. With the rearrangement, the reaction was strongly blocked.
On the reconstructed surfaces, reactions with oxygen were reduced by a factor between a billion and a trillion. In practice, the displaced atoms function as a microscopic shield, capable of preserving gold for very prolonged periods.
Resistance also creates challenges in the industry
The same characteristic that helps gold maintain its shine can limit its role in catalysts. These materials accelerate chemical reactions and already include gold-based versions in some industrial oxidation reactions.
The problem is that resistance to oxidation makes it difficult to decompose oxygen molecules. This can reduce the efficiency of gold in chemical and energy applications where this step is important for the catalyst’s performance.
Catalysts that combine gold and palladium are used in the production of vinyl acetate, a compound used in the manufacture of many plastics and other materials. Gold is also being studied to remove carbon monoxide from exhaust gases and produce propylene oxide.
Surface may become a path for new catalysts
For Montemore, inducing gold to dissociate oxygen could make it a very effective catalyst in certain reactions. The work suggests that this might be possible by preventing or reversing the rearrangements that protect the surface.
Previous attempts to improve gold catalysts often involved mixing the metal with other elements or depositing nanoparticles on oxide surfaces. The new study points to another possibility: directly altering the surface geometry of gold.
This approach shifts the focus from composition to the architecture of the material, showing that small atomic changes can significantly alter its reactivity.
The study reference is “Role of Reconstruction in the Inertness of Gold Toward Oxygen,” authored by Santu Biswas and Matthew M. Montemore, published on May 21, 2026, in Physical Review Letters.
Why oxidation matters in the study of materials
Oxidation is a common reaction between materials and oxygen, capable of altering color, shine, resistance, and performance.
In metals, this process can form surface layers that change appearance or interfere with technical use. Therefore, understanding how a surface reacts to oxygen is essential for areas such as conservation, electronics, industrial chemistry, and energy.
In the case of gold, the discovery is noteworthy because it shows that the material’s stability depends not only on its composition but also on the organization of atoms in the outermost layer.
