Biosignal sensing electrode
A biosignal sensing electrode, including: a substrate; a conductive film on the substrate, the conductive film containing particles of a layered material containing one or plural layers, the one or plural layers being oriented parallel to a surface of the substrate and containing a layer body represented by: M m X n , with a modifier or terminal T existing on a surface of the layer body; and a protective material containing a polymer having C═O and at least one of OH and NH as a functional group covering at least an 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.
1 . 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:
M m X n
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,
wherein the protective material covers and is in direct contact with at least the edge of the conductive film and a part of the second face of the conductive film.
2 . The biosignal sensing electrode according to claim 1 , wherein the polymer penetrates into the conductive film.
3 . The biosignal sensing electrode according to claim 2 , wherein the polymer comprises at least one selected from the group consisting of polyvinyl alcohol, polyisocyanate-crosslinked acrylic resin, epoxy-crosslinked acrylic resin, and polyamide-imide.
4 . The biosignal sensing electrode according to claim 1 , wherein the polymer comprises at least one selected from the group consisting of polyvinyl alcohol, polyisocyanate-crosslinked acrylic resin, epoxy-crosslinked acrylic resin, and polyamide-imide.
5 . The biosignal sensing electrode according to claim 1 , wherein the protective material further covers an outer surrounding area of the second face of the conductive film.
6 . The biosignal sensing electrode according to claim 5 , wherein the outer surrounding area is a region of the second face excluding the part of the second face of the conductive film that is exposed from the protective material.
7 . The biosignal sensing electrode according to claim 1 , further comprising a cover on the second face of the conductive film, wherein a part of the second face is exposed from the cover.
8 . The biosignal sensing electrode according to claim 7 , wherein the protective material is between the conductive film and the cover.
9 . The biosignal sensing electrode according to claim 1 , wherein the M m X n is at least one selected from the group consisting of Ti 2 C, Ti 3 C 2 , Ti 3 (CN), (Cr 2 Ti)C 2 , (Mo 2 Ti)C 2 , (MO 2 Ti 2 )C 3 , and (Mo 2.7 V 1.3 )C 3 .
10 . The biosignal sensing electrode according to claim 1 , wherein the substrate is conductive.
11 . The biosignal sensing electrode according to claim 1 , further comprising a lead connected to the conductive film.
12 . The biosignal sensing electrode according to claim 1 , wherein the surface of the substrate is in contact with the first face of the conductive film.
13 . The biosignal sensing electrode according to claim 1 , wherein a thickness of the conductive film is not less than 200 nm and not more than 20 μm.
14 . The biosignal sensing electrode according to claim 1 , wherein the at least the part of the second face of the conductive film that is exposed from the protective material has an area of not less than 0.5 mm 2 and not more than 750 mm 2 .