The device uses ultrathin nanomaterials, known as MXenes, that monitor a person’s well-being by analysing their perspiration.
MXenes share a similar two-dimensional nature to graphene and are composed of non-toxic metals, such as titanium, in combination with carbon or nitrogen atoms.
With naturally high conductivity and strong surface charges, MXenes are attractive candidates for biosensors that can detect small changes to chemical concentrations.
The researchers developed a MXene composite electrode, which they enclosed in a wearable armband sensor. The device, which had a modular design that used MXene inserts loaded with appropriate enzymes, could absorb perspiration and detect several analytes in human sweat, including glucose and lactic acid.
MXene sheets were combined with hydrogels, which are water-filled polymers that are compatible with human tissue because they are able to stretch. The team found that high levels of mobile ions in the hydrogel...