Additive induced morphology changes of nano‐crystalline SrWO₄

Abstract

Large-scale high-quality SrWO 4 nanocrystals have been synthesized in aqueous solutions under mild hydrothermal conditions with citrate as a simple additive. The crystals undergo an interesting 0-D to 1-D and to 0-D morphology changes and have been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The results showed that the experimental parameters had great influences on the shape evolution of products. The adjustment of these parameters such as the addition of the citrate and hydrothermal reaction conditions, can lead to obvious morphology changes of products, and the growth mechanism has been proposed. Room-temperature photoluminescence indicated that the as-prepared SrWO 4 nanocrystals had strong emission peaks at about 434 and 506 nm, respectively. This facile route could be employed to synthesize more promising nanomaterials with interesting self-assembly structures.

Supersonic microwave co-assistance (SMC) efficient synthesis of red luminescent Eu3+ activated silver molybdates and their phase-dependent evolution processes

“…13 In the past few years, numerous methods including molten salt synthesis, hydrothermal, sol-gel and template direction have been successfully explored as viable techniques for the preparation of luminescent composites. [14][15][16][17] Nevertheless, the suitable preparation techniques to fabricate highly organized materials with well-defined morphologies under very low temperature still remain a longstanding challenge. Recently, an emerging method, supersonic and microwave co-assistance (SMC) irradiation has been proved to be an environmental friendly and efficient technique in the synthesis of semiconductor materials including ZnO, 18 CdS.…”

Structural refinement, growth process, photoluminescence and photocatalytic properties of (Ba1-xPr2x/3)WO4 crystals synthesized by the coprecipitation method

“…32,33 In particular, the conventional hydrothermal method has recently been widely used in the preparation of various tungstates with different sizes and shapes. 34,35 However, these method still require high temperatures (160-220 uC) and long processing times (12-48 h). 36 Regarding their crystalline structure, tungstates (AWO 4 , A = Ca, Sr, Ba and Pb) have a scheelite-type tetragonal structure which is characterized by a space group of I4 1 /a) and a point group symmetry of (C 6 4h ) [37][38][39][40] while tungstates (AWO 4 , A = Zn, Mn, Co, Fe and Ni) exhibit a wolframite-type monoclinic structure with a space group of (P2/c) and a point group symmetry of (C 4 2h ).…”

Emissions and photocatalytic selectivity of SrWO4:Ln3+ (Eu3+, Tb3+, Sm3+ and Dy3+) prepared by a supersonic microwave co-assistance method

“…In recent years, a variety of methods have been developed to produce these materials, such as solid-state reactions, hydrothermal reactions, sol-gel preparation, and template direction. [11][12][13][14] However, a more efficient approach for obtaining novel luminescent composites is still considered a hot topic in this field. The chemical effects of ultrasonic irradiation and acoustic cavitation from the bubble collapse are regarded as rapidly increasing research areas.…”