Controlled synthesis, growth mechanism and optical properties of FeWO4 hierarchical microstructures

• DOI: 10.1039/c1ce05416c
• Publication Date: 2011-07-23T08:30:31Z
• Authors: Jian Zhang; Yang Wang; Shikuo Li; Xiufang Wang; Fangzhi Huang; Anjian Xie; Yuhua Shen
• Keywords: Hexamethylenetetramine; Ostwald ripening; Monoclinic crystal system; Crystal (programming language); Ethylene diamine

Monoclinic ferrous tungstate (FeWO4) microcrystals with hierarchical nano/microstructures have been selectively synthesized via a facile hydrothermal process in the presence of ethylenediamine tetraacetic acid disodium salt (Na2EDTA) and hexamethylenetetramine (HMT). HMT played triple roles as reducing agent, alkaline source, crystal growth modifier, while Na2EDTA served chelating reagent structure-directing agent. The appropriate conditions for synthesis multilayer flower-like FeWO4 were 200 °C 8 h concentrations at 0.03 mol L−1 0.025 L−1, respectively. morphology showed dramatic changes from bulky amorphous to hexangular increasing concentration, concentration would transform hexagonal structure sixfold symmetry architecture aspect ratio axis decreased gradually. Ostwald ripening self-assembled was proposed possible formation mechanism. photoluminescence (PL) intensity higher than that other structures. Magnetic measurement small ferromagnetic ordering low temperature. Furthermore, this work may open novel routes reagent-assisted architectures various morphologies.