keywords ACID CARBON NANOTUBES CATECHIN HYDRATE ELECTROPHORETIC DEPOSITION GRAPHENE HIGH AREAL CAPACITANCE HYDROTHERMAL SYNTHESIS Materials Science Materials Science, Multidisciplinary NANOPARTICLES Nanoscience & Nanotechnology OXIDE COMPOSITES SURFACE MODIFICATION Science & Technology Science & Technology - Other Topics Technology capping agent carbon nanotube catechol manganese oxide nanoparticle supercapacitor