An ultrasonic irradiation route (USI route) is developed to synthesize whisker-like copper sulfide (Cu9S8) nanocrystals via the reaction between copper sulfate pantahydrate (CuSO4·5H2O) and thioacetamide (CH3CSNH2) in an aqueous solution at room temperature under ambient pressure. XRD, TEM, UV–vis and PL spectra are used to characterize the obtained product. A possible reaction process is suggested in the end of this paper.
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