Why Can Graphene Kill Bacteria? A Review of Antibacterial Mechanisms, Comparative Advantages, and Application Prospects
I think graphene is fascinating as a candidate for killing bacteria. It is a single-atom-thick honeycomb sheet of carbon with a specific surface area of about 2,630 m²/g, and it conduct electricity extremely well. The antimicrobial resistance crisis is worsening: approximately 1.27 million people die from drug-resistant infections each year, and the WHO projects this could reach 10 million by 2050. Conventional disinfectants—ethanol, bleach, silver ions—attack specific biochemical targets, but bacteria continuously evolve resistance. This has motivated research into graphene, because it kills bacteria primarily through physical actions rather than chemical binding, reducing the risk of resistance development. Five antibacterial mechanisms have been identified: physical cutting by atomically sharp edges (the “nanoknife” effect), wrapping and suffocation, reactive oxygen species generation, phospholipid extraction via hydrophobic interactions, and electron transport disruption. This review covers the literature from 2010 to 2024, comparing graphene with ethanol, bleach, and silver ions across seven dimensions—killing mechanism, speed, persistence, resistance risk, safety, environmental impact, and cost—and discusses potential applications in medicine, water treatment, textiles, and public infrastructure. Current challenges include inconsistent selectivity, the absence of quality standards, long-term biosafety uncertainty, high production cost, and environmental interference. Graphene appears promising as a complementary option for specific applications, though significant obstacles remain before practical deployment.
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