A mild one-pot hydrothermal route has been successfully designed to controllably prepare orthorhombic alpha-MoO3 nanobelts and monoclinic MoO2 microaxletrees respectively by adjusting the dosage of (NH4)6M07O24 x 4H2O (AHM). The products are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-visible absorption spectrum. The as-prepared alpha-MoO3 nanobelts, with widths of 100-400 nm and lengths up to 30-40 microm, grow along [001] direction. The as-obtained MoO2 microaxletrees are assembled by countless nanolaths with the thickness of 80-150 nm. The chemical reaction processes for the formation of MoO(x) (MoO3 and MoO2) phases are investigated based on the experimental phenomena. The possible growth mechanisms are also discussed. The band gap energies (E(g)) of the obtained alpha-MoO3 nanobelts and MoO2 microaxletrees are calculated to be 2.90 and 3.72 eV, respectively. This work exhibits an effective approach in the selectively controlled synthesis of MoO(x) (x = 2, 3) nanomaterials via one-step hydrothermal strategy.
Copper selenide (CuSe nanoflakes, Cu2Se nanoearthworms) nanocrystals have been successfully fabricated using hydrazine hydrate as a reducing agent through an ultrasonic-assisted chemical route in one-pot solution. The as-prepared products are characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy and UV-visible absorption spectrum. The experimental results reveal that the appropriate reaction molar ratio of copper salt to selenium powder in the solution plays a critical role in controlling the phase and morphology of copper selenide. The chemical reaction processes for explaining the formation of copper selenide are simply studied. UV-VIS absorption spectra indicate that the synthesized flake-shaped CuSe and earthworm-like Cu2Se nanocrystals have good optical properties.
In this work, one-pot hydrothermal route has been presented to synthesize 3D MoO2 nanoplate-based microspheres and 1D MoO3 nanobelts and nanowires.The products are characterized by X-ray diffraction, field-emission scanning electron microscopy and UV-visible absorption spectrum.The experimental results reveal that the dosage of hydrochloric acid seriously influences the phase and morphology of molybdenum oxides.The optical properties of the synthesized 3D MoO2 nanoplate-based microspheres and 1D MoO3 nanobelts and nanowires are studied through the UV-visible absorption spectra.
Flower-shaped CuO with hierarchical microstructures was successfully synthesized through an ultrasound-assisted aqueous chemical method. The comparative experiment results show that the phase and morphology of as-obtained products are greatly affected by the volume of ammonia and the time for keeping ultrasonic irradiation, respectively. The prepared CuO microflowers assembled by nanosheets with needle-like tips exhibit a much higher activity than the commercial CuO for degrading Rhodamine B. Additionally, the photocatalytic performance of as-prepared hierarchical CuO microflowers was also evaluated through the degradation of Methylene blue and Methyl orange under the same conditions.
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