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Graphene Strengthens Neuronal Activity

A work led by SISSA in Italy and published on Nature Nanotechnology reports for the first time experimentally the phenomenon of iontrapping’ by graphene carpets and its effect on the communication between neurons.The researchers have observed an increase in the activity of nerve cells grown on a single layer of graphene. Combining theoretical and experimental approaches they have shown that the phenomenon is due to the ability of the material to ‘trap’ several ions present in the surrounding environment on its surface, modulating its composition.

Graphene is the thinnest bi-dimensional material available today, characterisedby incredible properties of conductivity, flexibility and transparency. Although there are great expectations for its applications in the biomedical field, only very few works have analysed its interactions with neuronal tissue.
A study conducted by SISSAScuola Internazionale Superiore di Studi
Avanzati, and the University of Trieste in association with the University of Antwerp (Belgium), the Institute of Science and Technology of Barcelona (Spain), has analysed the behaviour of neurons grown on a single layer of graphene, observing a strengthening in their activity. Through theoretical and experimental approaches the researchers have shown that such behaviour is due to reduced ion mobility, in particular of potassium, to the neuron-graphene interface. This phenomenon is commonly called ‘ion trapping’, already known at theoretical level, but observed experimentally for the first time only now.

“It is as if graphene behaves as an ultra-thin magnet on whose surface some of the potassium ions present in the extra cellular solution between the cells and the graphene remain trapped.
It is this small variation that determines the increase in neuronal
excitability” comments Denis Scaini, researcher at SISSA who has led the research alongside Laura Ballerini.
The study has also shown that this strengthening occurs when the graphene itself is supported by an insulator, like glass, or suspended in solution, while it disappears when lying on a conductor. “Graphene is a highly conductive material which could potentially be used to coat any surface. Understanding how its behaviour varies according to the substratum on which it is laid is essential for its future applications, above all in the neurological field” continues Scaini, “considering the unique properties of graphene it is natural to think for example about the development of innovative electrodes of cerebral stimulation or visual devices“.

Source: https://www.sissa.it/