A single layer of carbon atoms is enough to stop a hot piece of copper from losing its heat and prevent it from rusting.
April 25, 2026
Original Paper
CONTROL OF THE COPPER SURFACE EMISSIVITY VIA A GRAPHENE COATING
SSRN · 6637707
The Takeaway
Applying a graphene coating to copper suppresses oxidation even when the metal is heated to 300 degrees Celsius. This microscopic shield also reduces the amount of thermal radiation the copper emits by six times. Normally, hot metals lose energy quickly and corrode when exposed to air, but this one-atom-thick layer changes those physical rules. This discovery could lead to much more efficient heat exchangers and industrial machinery that stay cleaner and hotter for longer. It provides a simple way to drastically improve the performance of one of the world's most commonly used industrial metals.
From the abstract
A technology for synthesizing a graphene coating on bulk copper specimens has been developed. For the first time, the effect of a graphene overlayer on the emissivity of a copper surface heated in air has been investigated. It is shown that the chemical inertness and gas‐impermeability of the graphene layer inhibit oxygen diffusion to the metal surface and thereby suppress oxidation in air up to 300 °C. Such a graphene coating can be employed to reduce heat losses from heated components; for exa