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Porous SnO2 nanoflakes with loose-packed structure were synthesized by calcination of SnS2 precursors that were obtained through solvothermal method at low temperature. The as-obtained SnO2 product had a three-dimensional porous structure with relatively high specific surface area. It was found that the SnO2 nanoflakes inherited the morphology of precursor while numerous pores were formed after the annealing process. The combined techniques of X-ray diffraction, energy-dispersive spectrum, field emission scanning electron microscopy, and (high-resolution) transmission electron microscopy were used for characterization of the as-prepared SnO2 product. Moreover, the porous SnO2 nanoflakes with loose-packed structure could be used as gas sensors for detecting ethanol and acted as anode for lithium ion batteries. Our study shows that the as-prepared SnO2 nanoflakes not only exhibit good response and reversibility to ethanol gas but also display enhanced Li-ion storage capability.  相似文献
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Two-dimensional layered hexagonal SnS2 nanoflakes were synthesized by a mild hydrothermal method at 145°C for 48 h and then characterized in depth. The result shows that the SnS2 nanoflakes are very uniform and have a single-crystal layered nanostructure. These nanoflakes have an average size of about 300 nm and a thickness of about 50 nm. Based on time-dependent experimental results and other parallel experiments, we ascribe the self-repair–epitaxial growth mechanism to the growth of the SnS2 nanostructures. Furthermore, this growth mechanism is also discussed in detail from two aspects: the Bravais rule and the surface energy theories.  相似文献
3.
Copper nitride thin films were deposited on Si (1 0 0) wafers by reactive magnetron sputtering at various H2/N2 ratios. X-ray diffraction measurements show that the films are composed of Cu3N crystallites with anti-ReO3 structure and exhibit preferred orientation of [1 0 0] direction. Although the relative composition of the films has obviously changes with the H2/N2 ratios, the orientations of the films keep almost no changes. However, the grain size, lattice parameter and composition of the films are strongly dependent on the H2/N2 ratios. The copper nitride films prepared at 10% H2/N2 ratios show poor stability and large weight gain compared to the copper nitride films prepared at 0% H2/N2 ratios.  相似文献
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