title: Ultrathin SmVO4 nanosheets: ionic liquid-assisted hydrothermal synthesis, characterization, formation mechanism and optical property.
abstract: We report on the synthesis of ultrathin SmVO(4) nanosheets through a simple and facile ionic liquid-assisted hydrothermal approach and their application in luminescence properties. The as-prepared products were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy/high-resolution TEM, energy dispersive X-ray microanalysis, Fourier transform infrared spectrometry and photoluminescence technique. The SmVO(4) nanosheets had a tetragonal (t-) structure with the thickness of 10-20 nm and the size in the range of 10-12 microm. We found that the amount of ionic liquid, pH value and synthesizing temperature played crucial roles in controlling the structure and morphology of as-prepared samples. Particularly, the amount of ionic liquid [BMIM]Br can effectively control the shape of t-SmVO(4) nanostructures by adsorption on the (001) plane of the crystals, resulting in their preferential growth along the [100] and [010] directions via hydrogen bond-co-pi-pi stack interaction. A dissolution-recrystallization process was reasonably proposed to understand the formation mechanism of t-SmVO(4) nanosheets based on the experimental results. In addition, the photoluminescence spectra reveals that the as-prepared t-SmVO(4) nanosheets exit red emission related to (4)G(5/2)-->(6)H(7/2) transition.
authors.affiliation: Department of Materials Chemistry and Key Laboratory of Energy-Material Chemistry (Tianjin), College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Sun
authors.forename: Wenjun
authors.initials: W
authors.lastname: Zheng
mesh_terms: D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D008567:Membranes, Artificial; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D033362:Powder Diffraction; D012493:Samarium / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014638:Vanadates / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D008567:Membranes, Artificial; D014638:Vanadates; C502841:1-butyl-3-methylimidazolium chloride; D012493:Samarium