Researchers at the Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences have developed a wearable stress monitoring sensor that attaches to the arm and measures stress levels through the skin.

The device detects cortisol concentrations and other stress indicators found in sweat. As a result, it enables more direct tracking of psychological and emotional states.

Monitoring stress is important for early detection of serious conditions. It also supports lifestyle adjustments and helps maintain mental health.

However, the researchers noted that existing solutions often lack sufficient sensitivity to cortisol. In addition, they cannot accurately track real-time changes in emotional states. Many systems are also costly and rely on indirect indicators, such as skin conductivity or antibody-based methods. Consequently, their effectiveness is limited.

The new device aims to overcome these challenges. It is low-cost, easy to manufacture and simple to use. At the same time, it delivers more precise results.

The sensor achieves high sensitivity to cortisol using a flexible substrate. This substrate is coated with an ultra-thin, 20-nanometre layer of a conductive composite material. The material includes graphene, an organic polymer and ethylene glycol. Together, they reduce electrical resistance and enhance sensitivity. Moreover, the layer can be applied using two-dimensional printing or drop-casting techniques.

The researchers explained that sweat contains about 98 percent water and 2 percent chemical compounds. These include salts, oxygen, glucose, adrenaline, cortisol, dopamine and enzymes.

The sensing unit is worn on the wrist. This allows sweat to interact with the sensitive layer. As a result, charge accumulates and the electrical conductivity of the sensor increases, supporting accurate stress monitoring.

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