Covellite copper sulfide submicron crystals in the shapes of ball-like, rodlike, and chrysanthemumlike architectures congregated from nanoslices with thickness of 20 to 100 nm have been prepared by a hydrothermal method without using any surfactant and characterized by X-ray diffraction, energy-dispersive X-ray spectrometer (EDX), UV-vis optical absorption spectra, and electron-microscopy techniques. A systematic investigation has been carried out to understand the factors influencing the evolution of the crystal morphology which was found to be predominant by the reactant molar ratio (Tu:Cu(NO 3 ) 2 , Tu ) thiourea), the hydrothermal reaction time, and the temperature. Possible crystal growth processes are also discussed.

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