Search

Abstract: Sheaf-like CuO consisting of nanoplatelets were synthesized by a hydrothermal method at 100 °C from Cu(NO3)2·3H2O and NaOH in the presence of an ionic liquid 1-butyl-3-methyl imidazolium tetrafluoroborate ([BMIM]BF4). The XRD indicated the high crystal quality of CuO with monoclinic crystal structure. FESEM and TEM images showed the nanoplatelets with lengths of 4–5 μm, thickness of 65–80 nm and end angle of 60°. FTIR spectra and TG/DSC curves confirmed the adsorption of [BMIM]BF4 on the surface of CuO. The morphology of CuO could be controlled by the feeding manner of [BMIM]BF4. It was demonstrated that [BMIM]BF4 served as a cosolvent and modifiers in the reaction system. Further, the possible growth mechanism of the sheaf-like CuO was proposed. [Copyright &y& Elsevier]

Cr4+:Yb3Al5O12 (Cr4+:YbAG) single crystal of high quality has been grown by the Czochralski method. X-ray powder diffraction (XRPD) experiments showed that the Cr4+:YbAG crystal had the same structure as YAG (Y3Al5O12) crystal. The data of thermal expansion and specific heat of the crystal have been measured. The thermal expansion coefficient is α=8.63×10-6/K. The specific heat is 131.8 cal/mol·K at 320.5 K. The results show that Cr4+:YbAG crystal is a promising self-Q-switched laser crystal. [Copyright &y& Elsevier]