Hydrothermal synthesis of CdSe hierarchical microspheres

Abstract

CdSe hierarchical microspheres have been successfully synthesized by a hydrothermal route at 120 °C for 16 h via a reaction between CdCl 2 and Na 2 SeSO 3 in ionic liquid (1-butyl-3-methylimidazolium bromide)-water mixed medium. The structure and morphology of the as-prepared products have been investigated by XRD and SEM, and the results indicate that the CdSe hierarchical microspheres have wurtzite structures and are self-assembled by nanorods. It has been found that ionic liquid, reaction temperature, and reaction time have influence on the morphology of the products. The possible growth mechanism of CdSe with special morphology has been discussed.

Impact of Average, Local, and Electronic Structure on Visible Light Photocatalysis in Novel BiREWO6 (RE = Eu and Tb) Nanomaterials

“…However, the assynthesized orthorhombic phase of Bi 2 WO 6 has a flower-type morphology which is in good agreement with the literature. 14 Energy-dispersive absorption X-ray (EDAX) (Figure S3) gives the approximate composition of the material in equal stoichiometry. TEM confirms the presence of the rods as the predominant morphology along with a small fraction of spherically agglomerated nanoparticles in both Eu and Tb nanomaterials (Figure 3a,b).…”

“…Bi 2 WO 6 , the simplest member of Aurivillius phase (n = 1), is a wide band gap semiconductor (E g = 2.8 eV) and can harvest light below 440 nm, 14 and its valence band (VB) is largely dispersed because of the hybridization of O 2p and Bi 6s orbitals, and the conduction band (CB) is composed of W 5d orbitals. 15 It also exhibits interesting reversible phase transitions as a function of temperature: a low-temperature (LT-Bi 2 WO 6 ) orthorhombic (Pca2 1 ) phase and an intermediate (IT-Bi 2 WO 6 ) temperature orthorhombic (B2cb) phase at around 660 °C and a high-temperature (HT-Bi 2 WO 6 ) monoclinic (A2/m) phase at around 960 °C.…”