Microstructure and CO gas sensing property of Au/SnO2 core–shell structure nanoparticles synthesized by precipitation method and microwave-assisted hydrothermal synthesis method

2012 ◽  
Vol 166-167 ◽  
pp. 31-35 ◽  
Author(s):  
T. Yanagimoto ◽  
Y.-T. Yu ◽  
K. Kaneko
Keyword(s):  
Hydrothermal Synthesis ◽  
Shell Structure ◽  
Gas Sensing ◽  
Synthesis Method ◽  
Precipitation Method ◽  
Core Shell ◽  
Microwave Assisted ◽  
Core Shell Structure ◽  
Co Gas

A mesoporous Ni3N/NiO composite with a core–shell structure for room temperature, selective and sensitive NO2 gas sensing

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 42917-42922 ◽  
Author(s):  
Mingming Zou ◽  
Hu Meng ◽  
Fengdong Qu ◽  
Liang Feng ◽  
Minghui Yang
Keyword(s):  
Shell Structure ◽  
Room Temperature ◽  
Gas Sensing ◽  
Core Shell ◽  
Template Free ◽  
Core Shell Structure

Mesoporous Ni3N/NiO composites with core–shell structure were synthesized by a template free method, demonstrate a significant improvements both in sensitivity and in selectivity for NO2 gas sensing at room temperature.

Preparation of Amorphous Calcium Phosphate/Triclcium Silicate Composite Powders

2009 ◽  
Vol 79-82 ◽  
pp. 1643-1646 ◽  
Author(s):  
Qing Lin ◽  
Yan Bao Li ◽  
Xiang Hui Lan ◽  
Chun Hua Lu ◽  
Zhong Zi Xu
Keyword(s):  
Calcium Phosphate ◽  
Shell Structure ◽  
Amorphous Calcium Phosphate ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
X Ray ◽  
Core Shell Structure

The amorphous calcium phosphate (ACP)/tricalcium silicate (Ca3SiO5, C3S) composite powders were synthesized in this paper. The exothermal behavior of C3S determined by isothermal conduction calorimetry indicated that the ACP could be synthesis by chemical precipitation method during the induction period (stage II) of C3S. The composite powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results indicated that nanosized ACP particles deposited on the surface of C3S particles to form core-shell structure at pH=10.5, and the nCa/nP of ACP could be controlled between 1.0 and 1.5. The core-shell structure is stable after sintered at 500 oC for 3 h to remove the β-cyclodextrin (β-CD). As compared with the irregular C3S particles (1~5 μm), the composite powders particles are spherical with a diameter of 40~150 μm. Therefore, to obtain the smaller size of composite powders, it is expected to avoid the aggregate of C3S particles in the aqueous solution by addition of dispersant. As compared with C3S, the composite powders may contribute better injectability, strength and biocompatibility.

scholarly journals Eu-Doped Zeolitic Imidazolate Framework-8 Modified Mixed-Crystal TiO2 for Efficient Removal of Basic Fuchsin from Effluent

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7265
Author(s):  
Wanqi Zhang ◽  
Hui Liu ◽  
Zhechen Liu ◽  
Yuhong An ◽  
Yuan Zhong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Shell Structure ◽  
Mixed Crystal ◽  
Synthesis Method ◽  
Core Shell ◽  
Photocatalytic Efficiency ◽  
Basic Fuchsin ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Core Shell Structure

Zeolitic imidazolate framework-8 (ZIF-8) was doped with a rare-earth metal, Eu, using a solvent synthesis method evenly on the surface of a mixed-crystal TiO2(Mc-TiO2) structure in order to produce a core–shell structure composite ZIF-8(Eu)@Mc-TiO2 adsorption photocatalyst with good adsorption and photocatalytic properties. The characterisation of ZIF-8(Eu)@Mc-TiO2 was performed via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller analysis (BET) and ultraviolet–visible light differential reflectance spectroscopy (UV-DRs). The results indicated that Eu-doped ZIF-8 was formed evenly on the Mc-TiO2 surface, a core–shell structure formed and the light-response range was enhanced greatly. The ZIF-8(Eu)@Mc-TiO2 for basic fuchsin was investigated to validate its photocatalytic performance. The effect of the Eu doping amount, basic fuchsin concentration and photocatalyst dosage on the photocatalytic efficiency were investigated. The results revealed that, when 5%-Eu-doped ZIF-8(Eu)@Mc-TiO2 (20 mg) was combined with 30 mg/L basic fuchsin (100 mL) under UV irradiation for 1 h, the photocatalytic efficiency could reach 99%. Further, it exhibited a good recycling performance. Thus, it shows certain advantages in its degradation rate and repeatability compared with previously reported materials. All of these factors suggested that, in an aqueous medium, ZIF-8(Eu)@Mc-TiO2 is an eco-friendly, sustainable and efficient material for the photocatalytic degradation of basic fuchsin.

Indium-implantation-induced enhancement of gas sensing behaviors of SnO2 nanowires by the formation of homo-core–shell structure

2020 ◽  
Vol 321 ◽  
pp. 128475
Author(s):  
Jae-Hun Kim ◽  
Jin-Young Kim ◽  
Jae-Hyoung Lee ◽  
Ali Mirzaei ◽  
Hyoun Woo Kim ◽  
...  
Keyword(s):  
Shell Structure ◽  
Gas Sensing ◽  
Core Shell ◽  
Sno2 Nanowires ◽  
Core Shell Structure

Preparation and Optical Property of ZnS:Mn/XO2 (X=Ti, Si) Nanoparticles with Core/Shell Structure

2015 ◽  
Vol 814 ◽  
pp. 376-383
Author(s):  
Yu Long Wang ◽  
Wen Tao Zhang ◽  
Jian Ping Long ◽  
Pei Cong Zhang
Keyword(s):  
Optical Property ◽  
Luminescence Intensity ◽  
Shell Structure ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Tetrabutyl Titanate ◽  
Core Shell ◽  
Si Nanoparticles ◽  
Core Shell Structure ◽  
Co Precipitation

In this paper, Mn2+ doped ZnS (ZnS:Mn) nanoparticles were prepared by co-precipitation method. And then different thickness of TiO2 and SiO2 inorganic shell were coated on prepared ZnS:Mn through the hydrolysis reaction of tetrabutyl titanate (TBOT) and tetraethyl orthosilicate (TEOS). ZnS:Mn crystal and core/shell structure were described by X-ray diffraction (XRD) and scanning electron microscope (SEM). Optical property of all ZnS:Mn/XO2 (X=Ti, Si) nanoparticles were investigated by photoluminescence (PL) spectrometer. The effect of Mn2+ concentration and XO2 (X=Ti, Si) shell thickness on luminescence intensity of ZnS:Mn/XO2 was studied. The results showed that with TiO2 and SiO2 shell thickening, Mn2+ emission of ZnS:Mn/XO2 samples increased first and then decreased. When the thickness of inorganic shell (molar ratio of shell and core amount) reached to 0.5 (TiO2) and 1.0 (SiO2), the optimal luminescence intensity was obtained. The emission of ZnS:Mn/TiO2 and ZnS:Mn/SiO2 was 2.0 and 1.5 times more in intensity than that of uncoated ZnS: Mn, respectively.

A microwave-assisted synthesis of CoO@Co core–shell structures coupled with N-doped reduced graphene oxide used as a superior multi-functional electrocatalyst for hydrogen evolution, oxygen reduction and oxygen evolution reactions

2017 ◽  
Vol 5 (12) ◽  
pp. 5865-5872 ◽  
Author(s):  
X. X. Liu ◽  
J. B. Zang ◽  
L. Chen ◽  
L. B. Chen ◽  
X. Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Shell Structure ◽  
Shell Structures ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
Microwave Assisted ◽  
Reduced Graphene ◽  
Core Shell Structure

CoO@Co with a core–shell structure coupled with N-rGO used as a superior multifunctional electrocatalyst was obtained using a convenient and controllable technique.

scholarly journals Simple hydrothermal synthesis of Fe3O4-PEG nanocomposite

2013 ◽  
Vol 11 (9) ◽  
pp. 1527-1532 ◽  
Author(s):  
Yasmeen Junejo ◽  
Abdulhadi Baykal ◽  
Huseyin Sözeri
Keyword(s):  
Polyethylene Glycol ◽  
Hydrothermal Synthesis ◽  
Fe3o4 Nanoparticles ◽  
Shell Structure ◽  
Polymer Coating ◽  
Core Shell ◽  
Vibrating Sample Magnetometer ◽  
One Step ◽  
Core Shell Structure ◽  
Fe3o4 Core

AbstractAbstract We report a one-step hydrothermal synthesis of Fe3O4 nanoparticles coated with Polyethyleneglycol (PEG). The formation of the Fe3O4 core and the polymer coating took place simultaneously. Fe3O4/polyethylene glycol (PEG) magnetic nanocomposite with a core-shell structure with a 17±7 nm crystallite size prepared by simple hydrothermal method. VSM ( Vibrating Sample Magnetometer) analysis proved the superparamagnetic character of the nanocomposite. Graphical abstract

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