Fabrication of Combined One-Dimensional and Three-Dimensional Structure of Potassium Tungstate Crystal Layers by Spray Deposition with Polystyrene Colloidal Crystal Templates

Abstract

Well-aligned honeycomb-designed layers of potassium tungstate (K0.33WO3.165) were successfully fabricated by spray deposition and microsphere lithography using polystyrene (PS) colloidal crystals as templates. A densely packed monolayer of monodisperse PS microspheres was formed on a silica glass surface, using the Langmuir–Blodgett thin film technique. Subsequently, a (NH4)10W12O41·5H2O-KCl aqueous solution was sprayed as a micromist on the PS templates. While the K0.33WO3.165 crystal layers were synthesized by chemical reaction between W and K sources during the heating, the PS templates were thermally decomposed, generating an inverse opal surface structure where the interstitial space of the densely hexagonal packed PS microspheres had been. Numerous hexagonal rodlike crystals were grown on the honeycomb-designed layer of K0.33WO3.165. X-ray diffraction analysis, energy-dispersive X-ray spectroscopy analyses, and X-ray photoelectron spectroscopy were performed to analyze the combined one-dimensional and three-dimensional honeycomb-designed structure.

Innovative fabrication of a Au nanoparticle-decorated SiO2 mask and its activity on surface-enhanced Raman scattering

“…As shown in the literature, previous PS sphere arrays were generally fabricated by the Langmuir-Blodgett method. 22,23 In this work, we propose a new and simple method to assemble PS colloids on the surface of water with the assistance of dropped SDS surfactant. Due to the modulation of the surface energy of the water, the PS colloids can assemble into a hexagonal monolayer on the surface of the water.…”

Floating zone growth and optical phonon behavior of corundum Mg4Ta2O9 single crystals

“…Magnesium tantalates, which show favorable potential applications in optical and dielectric devices, [1][2][3][4] have received increasing attention from researchers and developers in recent years. The phase diagram of the MgO-Ta 2 O 5 system, established in a previous study, 5 indicates that it consists of three distinct forms: Mg 4 Ta 2 O 9 , Mg 3 Ta 2 O 8 , and MgTa 2 O 6 .…”

“…The phase diagram of the MgO-Ta 2 O 5 system, established in a previous study, 5 indicates that it consists of three distinct forms: Mg 4 Ta 2 O 9 , Mg 3 Ta 2 O 8 , and MgTa 2 O 6 . Corundum Mg 4 Ta 2 O 9 has a hexagonal unit cell with space group P3c1 (165), 6 a ¼ 0.51611 nm, c ¼ 1.40435 nm, and a unit cell volume of 0.32396 nm 3 . Mg 4 Ta 2 O 9 appears to be stable up to its melting point (2098 K) and is particularly favored as a candidate material for luminescent [7][8][9] and microwave dielectrics due to its low dielectric loss and high dielectric constant.…”