Ri Yu

Synthesis and characterization of Zn2SiO4:Mn2+ nanocrystals and tuning of phase by controlling of silica shell thickness

AbstractIn this paper is reported the synthesis and characterization of ZnO@Zn2SiO4:Mn2+ and Zn2SiO4:Mn2+ using ZnO@SiO2 nano spheres. The SiO2-shell thickness of the nano sphere was controlled 20 to 60 nm, and was controlled by selecting the reaction time of the Stöber method. The Zn2SiO4:Mn2+ as a glaze was prepared by addition of Mn2+ precursor the ZnO@SiO2 core-shell and then reacted in aqueous solution. Finally, the reactant was annealed at 1000°C so that Zn2SiO4:Mn2+ particles were obtained. The influences of the Zn/Si volume ratio on the PL (photoluminescence) properties of Zn2SiO4:Mn2+ were tunable by control the silica thickness of the ZnO core. The structure, morphology and luminescent property of the synthesized samples were determined by XRD (x-ray diffraction), TEM (transmission electron microscopy) and PL (photoluminescence).

마이크로에멀젼법을 이용한 나노 CoFe₂O₄ 분말의 실리카 코팅

We report the preparation of nanocrystalline cobalt ferrite, CoFe₂O₄, particles and their surface coating with silica layers using micro emulsion method. The cobalt ferrite nanoparticles with the size 7㎚ are firstly prepared by thermal decomposition method. Hydrophobic nanoparticles were coated with silica using micro-emulsion method with surfactant, NH₄OH, and tetraethylorthosilicate (TEOS). Monodispersed and spherical silica coated cobalt ferrite nanoparticles have average particle diameter of 38 ㎚ and narrow sized distribution.

Color Evolution and Phase Transformation of α-FeOOH@SiO 2 and β-FeOOH@SiO 2 pigments

【This manuscript reports on compared color evolution about phase transformation of

Effect of MgO and NH4OH on Formation of 5Mg(OH)2·MgSO4·3H2O Whiskers

{\alpha}-FeOOH@SiO_2

Effect of MgO and NH 4 OH on Formation of 5Mg(OH) 2 ·MgSO 4 ·3H 2 O Whiskers

and

Fabrication and Characterization of Silica Coated Fe 3 O 4 Nanoparticles in Reverse Micro Emulsion

{\beta}-FeOOH@SiO_2

Evaluation of Color and Structure of α-Fe2O3 Nanocapsules by Tuning of the SiO2 Morphology

pigments. Prepared

Synthesis and characterization of multi-functional ZnO nano ceramic phosphor.

{\alpha}

Coloration and Chemical Stability of SiO 2 and SnO 2 Coated Blue CoAl 2 O 4 Pigment

-FeOOH and

Size Control and Optical Properties of ZnO nanoparticles by Zinc-Lithium-Acetate System

{\beta}