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CuO feather-like and flower-like crystals have been synthesized by a fast microwave-assisted solution approach using Cu(NO3)2 and NaOH. The morphology transformation of CuO could be achieved by ionic liquid 1-n-butyl-3-methyl imidazolium tetrafluoroborate ([BMIM]BF4). With [BMIM]BF4, flower-like CuO were obtained, whereas without [BMIM]BF4, feather-like CuO were obtained. The possible formation mechanism of flower-like CuO was discussed on the basis of experimental results. The products were characterized by XRD, FESEM/EDS, and TEM/SAED. In addition, the adsorption of [BMIM]BF4 on flower-like CuO was confirmed by FTIR and TG/DSC, and the band gap energies of the flower-like CuO was estimated by UV-vis spectra. [ABSTRACT FROM AUTHOR]

Two-dimensional (2D) CuO nanoplatelets were synthesized in the presence of ionic liquids under the mild hydrothermal conditions at 140°C by self-assembly. The thickness of CuO nanoplatelets was about 35 nm prepared in 1-butyl-3-methylimidazolium chloride. XRD, FESEM, and TEM were used to characterize the structure features of the products. FTIR spectra and TG curves confirmed the adsorption of ionic liquids on the surface of CuO nanoplatelets. In addition, UV-visible absorption spectra were employed to estimate the band gap energies of the CuO nanoplatelets as nanosized semiconductors. It was demonstrated that the ionic liquids could act as a cosolvent, soft template agent and modifiers. [ABSTRACT FROM AUTHOR]