Single-crystalline nanoplates of magnesium oxide were successfully synthesized through a calcinations route from the newly produced Mg（OH）2 precursors, which were directly prepared from the commercial bulk magnesium...Single-crystalline nanoplates of magnesium oxide were successfully synthesized through a calcinations route from the newly produced Mg（OH）2 precursors, which were directly prepared from the commercial bulk magnesium powders under a hydrothermal process in the absence of any additions. Scanning electron microscope （SEM） analysis indicated that the nanoplates were 2-6 μm in average width and about 80 nm in thickness. Transmission electron microscopy （TEM） images revealed that there was large quantity of nanopores with diameters ranging from 5 to 40 nm distributed in these nanoplates. The room-temperature photoluminescence （PL） spectrum of the nanoplates illustrated a strong blue emission band at 416 nm and a weak green emission band at 559 nm. Brunauer-Emmett-Teller （BET） analysis exhibited a feature of high surface of 127.21 m^2/g for the products. The fabrication mechanism of the product was also discussed.展开更多
Using ethylene glycol as solvent and reductant, CuCl2-2H2O, （NH2）2CS and self-prepared GaCl3 as the starting materials, CuGaS2 nanostrucutures were synthesized on a large scale at 220℃. Powder X-ray diffraction. tr...Using ethylene glycol as solvent and reductant, CuCl2-2H2O, （NH2）2CS and self-prepared GaCl3 as the starting materials, CuGaS2 nanostrucutures were synthesized on a large scale at 220℃. Powder X-ray diffraction. transmission electron microscopy, field-emission scanning electron microscope, high-resolution transmission electron microscopy＂ and X-ray＂ photoelectron spectroscopy were used to characterize the products. It demonstrated the evolution of the CuGaS2 particles from spherical assemblies to flowerlike morphology, over time, at 220℃. Simultaneously, we elucidated the specific roles of reaction temperature, reaction time and solvent in the formation of the final CuGaS2 nanostructures. A possible formation mechanism of CuGaS2 nanostrucutures was also discussed. The room temperature photoluminescence spectrum showed blue-shift and an increase of intensity, with a decrease in the sizes of CuGaS2 particles.展开更多
基金Ⅴ. ACKN0WLEDGEMENTS This work was supported by the National Natural Science Foundation of China （No.20571068, No.90406024, No.20321101, No.20371044）, the Anhui Provincial Natural Science Foundation （No.03044901） and the Chinese Ministry of Education.
文摘Single-crystalline nanoplates of magnesium oxide were successfully synthesized through a calcinations route from the newly produced Mg（OH）2 precursors, which were directly prepared from the commercial bulk magnesium powders under a hydrothermal process in the absence of any additions. Scanning electron microscope （SEM） analysis indicated that the nanoplates were 2-6 μm in average width and about 80 nm in thickness. Transmission electron microscopy （TEM） images revealed that there was large quantity of nanopores with diameters ranging from 5 to 40 nm distributed in these nanoplates. The room-temperature photoluminescence （PL） spectrum of the nanoplates illustrated a strong blue emission band at 416 nm and a weak green emission band at 559 nm. Brunauer-Emmett-Teller （BET） analysis exhibited a feature of high surface of 127.21 m^2/g for the products. The fabrication mechanism of the product was also discussed.
文摘Using ethylene glycol as solvent and reductant, CuCl2-2H2O, （NH2）2CS and self-prepared GaCl3 as the starting materials, CuGaS2 nanostrucutures were synthesized on a large scale at 220℃. Powder X-ray diffraction. transmission electron microscopy, field-emission scanning electron microscope, high-resolution transmission electron microscopy＂ and X-ray＂ photoelectron spectroscopy were used to characterize the products. It demonstrated the evolution of the CuGaS2 particles from spherical assemblies to flowerlike morphology, over time, at 220℃. Simultaneously, we elucidated the specific roles of reaction temperature, reaction time and solvent in the formation of the final CuGaS2 nanostructures. A possible formation mechanism of CuGaS2 nanostrucutures was also discussed. The room temperature photoluminescence spectrum showed blue-shift and an increase of intensity, with a decrease in the sizes of CuGaS2 particles.
