Synthesis and characterization of Black Au nanoparticles deposited over g-CN nanosheets: enhanced photocatalytic degradation of methylene blue.

Black AuNPs, prepared by a facile seeding growth method under ambient conditions, displayed efficient broadband absorption of the incident light over the entire visible and near-infrared regions of the solar spectrum. The spherical black AuNPs with the size of 2-4 nm were deposited over mesoporous g-CN nanosheets. Novel black AuNPs/g-CN plasmonic photocatalysts were used to remove methylene blue (MB) dye from an aqueous solution.