New Coating Uses Graphene Oxide to Deliver Silver Ions for Long-Lasting Antimicrobial Effect

Researchers at the National Graphene Institute have developed a new type of antimicrobial coating that can improve hygiene in healthcare, consumer and industrial products. Working in collaboration with medical technology company Smith & Nephew, a team led by Prof. Rahul R Nair published their findings in the journal Small.

Silver has long been used to fight bacteria, particularly in wound care, because of its property of releasing ions that damage bacterial cells. However, some current approaches have drawbacks: silver can be released too quickly or unevenly, potentially harming healthy surrounding tissues, and is often used in unsustainable quantities. The Manchester team solved these problems by designing a graphene oxide-based membrane that can release silver ions slowly and precisely over time. The key lies in the membrane's structure: nanometer-scale channels function like filters that regulate the amount of silver released. "Our research represents a paradigm shift in antimicrobial coating technology," says lead author Prof. Nair. "By harnessing the potential of graphene oxide membranes, we have developed a method for controlled silver ion release and opened the way for sustained antimicrobial effectiveness in various applications."

The team also created a test model that better reflects real biological conditions. Using fetal bovine serum in laboratory experiments, they were able to simulate the environment the coating would encounter in the body and gained clearer insight into how it performs over time. First author Dr. Swathi Suran adds, "This approach provides the exact right amount of silver release for long-term protection. It has potential in many areas, including antimicrobial coatings for wound dressings and implants, and can provide long-term benefits for both patients and healthcare providers."

Looking ahead, the team is focused on exploring how this coating can be integrated into a range of everyday and medical products and aims to transform bacterial resistance from a hidden threat into a manageable challenge.

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