Biosignal sensing electrode

A biosignal sensing electrode, comprising

• a substrate;
• a conductive film on the substrate and having a first face on a side thereof facing the substrate, a second face on a side thereof opposite to the substrate, and an edge connecting the first face and the second face, wherein the conductive film comprises particles of a layered material comprising one or plural layers, the one or plural layers being oriented parallel to a surface of the substrate and comprising a layer body represented by:
• MmXn
• wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is not less than 1 and not more than 4, and m is more than n but not more than 5, and
• a modifier or terminal T existing on a surface of the layer body, wherein T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, and a hydrogen atom;
• and
• a protective material comprising a polymer having C═O and at least one of OH and NH as a functional group covering at least the edge of the conductive film, the functional group being bonded to the particles of the layered material, and at least a part of the second face of the conductive film is exposed from the protective material.