“…Some notable nonstoichiometric Cu 2– x S phases include chalcocite (Cu 2.0–1.96 S), djurleite (Cu 1.96 S–Cu 1.93 S), roxbyite (Cu 1.81 S or Cu 58 S 32 ), digenite (Cu 1.8 S or Cu 9 S 5 ), and anilite (Cu 1.74 S or Cu 7 S 4 ) that display p-type semiconducting properties with a high h + density. The roxbyite (Cu 58 S 32 ) phase is a structurally stable semiconductor that shows distinct optical and electronic properties, high carrier density, and energy storage features with promising application potential in photocatalytic reduction reactions. , In recent years, the roxbyite (Cu 1.81 S) phase with controlled morphology including platelet, nanorod, triangular, and hexagonal plate, and nanodisk shape has been prepared and studied for optoelectronic and catalytic applications. ,− However, the construction of microscopically ordered morphology with dimensions in the wavelength range of the visible energy photons is advantageous in terms of improved light harvesting through multiple absorption–reflection cycles . In this context, the synthesis of the roxbyite phase with a snowflake morphology having radially symmetric dendrites and regularly repeating structure in microscopic dimensions is highly important.…”