Nanostructural Evolution: From One-Dimensional Tungsten Oxide Nanowires to Three-Dimensional Ferberite Flowers

Abstract

Supporting InformationFig. S1 In-situ TEM observation of the FeWO 4 flowers turning under electron beam. (a-b) show the 6-folded feature of a flower when initially exposed to electron beam during observation and tilting of the sample holder. (c-i) revealed a series of turning sequences of the same flower, after exposing to the focused electron beam for about 10 min. When shifting the beam towards the flower, it started to turn over, projecting a platelet shape at some stage, images (c) and (i). Damage on the surface was also observed due to the irradiation of the high density electron beam (TEM operated at 200 KeV). Pictures from (c-i) were taken at an interval about 40 s. The scale bar in the images is same.

Hydrothermal synthesis of FeWO4-graphene composites and their photocatalytic activities under visible light

“…Fig. 3 shows the Raman spectra of FeWO 4 and FeWO 4 -RGO composite, and the Raman bands at 93, 132, 215, 279, 349, 683, and 875 cm −1 correspond to the Raman spectrum of FeWO 4 , which are in agreement with the results reported by Qian et al [25] and Hu et al [26]. The strong band at 875 cm −1 is attributed to 1 symmetric A g mode of terminal WO 2 .…”

“…gap energy of FeWO 4 , and enhanced visible light absorption after RGO coupling. These values agree well with those reported in the literatures[9,26].…”

Electronic structure and magnetic properties of FeWO4 nanocrystals synthesized by the microwave-hydrothermal method

“…Metal tungstates have attracted attention in the last decades since they are a fascinating class of materials that offer a large wide of technological applications, such as catalysts, 1 optics, 2 humidity sensors, 3 and magnetic, 1,4,5,6 properties. Iron tungstate (FeWO 4 ) is one of the most promising materials of this family and their electronic and magnetic properties have been studied to explore its potential applications.…”

“…Numerous synthetic procedures for obtaining FeWO 4 have been developed such as the conventional solid-state, the spray pyrolysis, the Czochralski method, and the hydrothermal route, among others. 1,2,5,7,[11][12][13] However, these procedures require long processing times and some of them high temperatures; therefore, it remains a great challenge to develop a feasible method for the synthesis of FeWO 4 nanostructures. To lower the time requirements and the temperature of the synthesis, microwave assisted hydrothermal (MAH) h a s b e e n u s e d i n r e c e n t y e a r s a n d i t is one of the most promising methods for the preparation of nanomaterials with controlled size and shape.…”

Growth and mechanism of branched FeWO4@FeS core–shell nanostructures

“…Iron tungstate (FeWO 4 ) belongs to a fascinating family of wolframite-type tungstates, which are important inorganic functional materials with potential applications in catalysts, humidity sensors, pigments, scintillation detectors, optical fibers, phasechange optical recording devices, laser hosts, and so on [1][2][3][4][5]. Until now, considerable effort has been focused on designing and preparing novel hierarchical architectures of FeWO 4 nanomaterials, because their physical and chemical properties are strongly correlated with their structures, including geometry, morphology, and dimensionality.…”