Graphene quantum dot-gold nanocomposite for drug-free antibacterial wound treatment

Researchers at China’s Gannan Medical University and Shanghai University recently developed a Schottky junction-based nanocomposite that combines gold nanoparticles (AuNPs) with graphene oxide quantum dots (GOQDs), demonstrating a highly effective, antibiotic-free strategy for treating bacterial infections and accelerating wound healing.

The work addresses a known clinical challenge: the rapid rise of multidrug-resistant (MDR) bacteria driven by widespread antibiotic use. Conventional approaches – such as increasing antibiotic dosage or developing new drugs – are often limited by toxicity, long development timelines, and persistent resistance. As a result, non-invasive phototherapies, particularly photodynamic therapy (PDT) and photothermal therapy (PTT), are gaining attention as alternatives. However, each modality has intrinsic limitations: PDT efficiency is constrained by electron–hole recombination and oxygen availability, while PTT requires precise thermal control to avoid damaging healthy tissue. To overcome these constraints, the researchers engineered a hybrid nanostructure in which AuNPs and GOQDs form a Schottky junction – a metal–semiconductor interface that enables directional charge transfer.

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