“…In addition Cu 2 S is a material of much interest in solar cells, [10][11][12] photocatalysis, 13 catalysis 14 and biosensors, 15 due to Cu 2 S having a bulk band gap of 1.21 eV. 16 Many fabrication techniques have been studied since Cu 2 S was discovered to be a highly efficient thermoelectric material, including melt-solidication, 17 mechanochemical synthesis, 18 ultrasonication and pressing, 19 chemical synthesis and hot pressing, 20 hydrothermal synthesis and hot pressing, 21 hydrothermal synthesis and mechanical alloying followed by spark plasma sintering, 22 mechanical alloying followed by spark plasma sintering, 23 and mechanical alloying with Se doping followed by spark plasma sintering. 24 These techniques however, require high pressure, high temperature and lengthy fabrication times which all contribute to the embodied energy of the material.…”