Brain–machine interfaces provide a bridge between the human brain and external software or hardware. Such systems detect the brain’s electrical signals and translate them into commands for electronic systems such as a computer or robotic arm. The neural signals can be collected non-invasively using electroencephalography (EEG) electrodes attached to the scalp.

Recently, researchers have developed EEG sensors made from graphene, which offers excellent conductivity and biocompatibility. Graphene-based biosensors, however, often have low durability, corroding upon contact with sweat, and exhibit high skin-contact impedance that hampers the detection of signals from the brain. A novel graphene-based biosensor developed at the University of Technology Sydney aims to overcome these limitations, detecting EEG signals with high sensitivity and reliability – even in highly saline environments.

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