Controlled Synthesis of BaF2 Nanorods via Hydrothermal Microemulsion Method

2007 ◽  
Vol 121-123 ◽  
pp. 441-444
Author(s):  
Y.C. Chen ◽  
Y.G. Zhang
Keyword(s):  
Electron Microscopy ◽  
Raw Materials ◽  
Barium Chloride ◽  
Building Blocks ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
Microemulsion Method ◽  
X Ray ◽  
Transmission Electron ◽  
Microemulsion Droplet

BaF2 nanorods were synthesized by hydrothermal microemulsion method using sodium fluoride (NaF) and barium chloride (BaCl2) as the raw materials. The as-prepared products were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The results showed that the products were composed of BaF2 nanorods with diameters of 18-62 nm and lengths up to 1μm. A directed aggregation growth process mediated by the microemulsion droplet building blocks is proposed for the formation of BaF2 nanorods. Further work is in progress to evaluate the possibility of synthesizing other fluoride 1D nanostructures using a similar method.

scholarly journals A novel technique to synthesis of tenorite (CuO) nanoparticles from low concentration CuSO4 solution

2011 ◽  
Vol 47 (1) ◽  
pp. 73-78 ◽  
Author(s):  
E. Darezereshki ◽  
F. Bakhtiari
Keyword(s):  
Electron Microscopy ◽  
Decomposition Method ◽  
Raw Materials ◽  
Spherical Shape ◽  
Cuo Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Decomposition Method ◽  
Novel Technique ◽  
Transmission Electron

In this study CuO nanoparticles were prepared via direct thermal decomposition method using basic copper sulphates as wet chemically synthesized precursor which was calcined in air at 750?C for 2h. Samples were characterized by thermogravimetric (TG-DSC), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), infrared spectrum (IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The XRD, EDS, and IR results indicated that the synthesized CuO particles were pure. The SEM and TEM results showed that the CuO nanoparticles were of approximate spherical shape, and 170?5 nm in size. Using this method, Cuo nanoparticles could be produced without using organic solvent, expensive raw materials, and complicated equipment.

HYDROTHERMAL SYNTHESIS OF POTASSIUM BISMUTH TITANATE NANOPARTICLES

2006 ◽  
Vol 05 (04n05) ◽  
pp. 663-669 ◽  
Author(s):  
GANGQIANG ZHU ◽  
HONGYAN MIAO ◽  
GUOQIANG TAN ◽  
YUN LIU ◽  
AO XIA
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Phase Composition ◽  
Bismuth Titanate ◽  
Raw Materials ◽  
Phase Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

Potassium bismuth titanate nanoparticles were prepared by the hydrothermal method using Ti ( C 4 H 9 O )4 and Bi ( NO 3)3·5 H 2 O as raw materials in alkaline solution at temperatures of 160–200°C. The crystal phase, particle size, morphology and dispersion of the particles were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the particles with sizes of about 50–100 nm in diameter are well-dispersed K 0.5 Bi 0.5 TiO 3 (KBT) crystals of tetragonal structure, and the alkaline concentration and the temperature of solutions have great effects on the phase composition and morphology of the resultant particles. We could gain the KBT phase of high purity when the concentration of KOH is about 8–12 M and the reaction temperature is about 170–180°C.

Simultaneous phase- and morphology-controlled synthesis of MnO2 crystals through controlled release of cuprous ions in hydrothermal condition

2009 ◽  
Vol 24 (1) ◽  
pp. 58-65 ◽  
Author(s):  
Yange Zhang ◽  
Zhi Zheng ◽  
Ka Wai Wong ◽  
Fengling Yang ◽  
Zude Zhang
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Condition ◽  
Redox System ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron ◽  
Cuprous Ions

The α-, β-, and δ-MnO2 with various morphologies have been synthesized by a novel redox system of KMnO4 and CuCl with HCl added under a hydrothermal condition. The resultant MnO2 products have been characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Upon control of reaction temperature and duration, it was observed that MnO2 polymorphs of different morphology (e.g., flowery δ-MnO2, β-MnO2 nanowires and octahedrons, α-MnO2 nanowires) can be prepared in an adjustable manner. The phenomenon is mainly attributed to the effect of cuprous ions controllably released from CuCl by the action of HCl at different experimental conditions. The corresponding formation mechanism for the MnO2 crystals will also be proposed and discussed.

Controlled Synthesis of Homogeneous Carbon Nano-Capsules Based on Biomaterials

2008 ◽  
Vol 58 ◽  
pp. 27-31 ◽  
Author(s):  
Yu Liang An ◽  
Yan Qiu Liu ◽  
Xia Yuan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Carbon Nanomaterials ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Flow ◽  
Fe Catalyst ◽  
Transmission Electron ◽  
Carbon Nanocapsules

A novel and practical route for preparing carbon nanocapsules using biomass – starch as the starting materials was presented. Carbon nanocapsules can be effectively synthesized by catalytic carbonizing starch in hydrogen flow. The carbohydrate was carbonized in a controllable way that leads to a large amount of carbon cages nanoparticles under Fe catalyst. Transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) were employed to characterizing carbon nanomaterials. The growth mechanism of carbon nanocapsules is briefly discussed in term of composition of precursor.

scholarly journals Size-Controlled Synthesis of Fe3O4Magnetic Nanoparticles in the Layers of Montmorillonite

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Katayoon Kalantari ◽  
Mansor B. Ahmad ◽  
Kamyar Shameli ◽  
Mohd Zobir Bin Hussein ◽  
Roshanak Khandanlou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Average Diameter ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Interlamellar Space ◽  
Size Controlled ◽  
Chemical Coprecipitation Method

Iron oxide nanoparticles (Fe3O4-NPs) were synthesized using chemical coprecipitation method. Fe3O4-NPs are located in interlamellar space and external surfaces of montmorillonite (MMT) as a solid supported at room temperature. The size of magnetite nanoparticles could be controlled by varying the amount of NaOH as reducing agent in the medium. The interlamellar space changed from 1.24 nm to 2.85 nm and average diameter of Fe3O4nanoparticles was from 12.88 nm to 8.24 nm. The synthesized nanoparticles were characterized using some instruments such as transmission electron microscopy, powder X-ray diffraction, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy, vibrating sample magnetometer, and Fourier transform infrared spectroscopy.

Synthesis and Characterization of Graphene/Cu2SnS3 Quantum Dots Composites

2012 ◽  
Vol 624 ◽  
pp. 59-62 ◽  
Author(s):  
Cai Xia Li ◽  
Jun Guo ◽  
Danyu Jiang ◽  
Qiang Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Quantum Dots ◽  
Raw Materials ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Phase Structures ◽  
Transmission Electron

In this paper, employing Cu(AC)2•H2O, SnCl2•2H2O and thiourea as raw materials, the composites of graphene/Cu2SnS3 quantum dots (QDs) were prepared simply and quickly using the hydrothermal method. Meanwhile, the separate Cu2SnS3 QDs were also synthesized in the same way. The as-obtained Cu2SnS3 QDs and composites’ phase structures were analyzed and characterized by powder X-ray diffraction (XRD), and the results indicated that the size of the Cu2SnS3 QDs in the composites were less than that of the separate Cu2SnS3 QDs. At the same time, their morphologies were also observed and cross-confirmed by Transmission Electron Microscopy (TEM), and the measurements manifested that Cu2SnS3 QDs were uniformly dispersed on the surface of the graphene, while the separate Cu2SnS3 QDs have obvious glomeration. In addition to this, elemental analysis was also made to verify the existence of Cu2SnS3 on the surface of graphene.

Green synthesis of nanocrystalline α-Al2O3 powders by both wet-chemical and mechanochemical methods

2018 ◽  
Vol 32 (08) ◽  
pp. 1850109 ◽  
Author(s):  
Huiying Gao ◽  
Zhiyong Li ◽  
Peng Zhao
Keyword(s):  
Electron Microscopy ◽  
Raw Materials ◽  
Environmentally Benign ◽  
X Ray Diffraction ◽  
Mechanochemical Method ◽  
X Ray ◽  
Transmission Electron ◽  
Carbonate Hydroxide ◽  
Wet Chemical ◽  
Α Al2o3

Nanosized [Formula: see text]-Al2O3 powders were prepared with AlCl[Formula: see text]6H2O and NH4HCO3 as raw materials by both wet-chemical and mechanochemical methods, through the synthesis of the ammonium aluminum carbonate hydroxide (AACH) precursor followed by calcination. The environmentally benign starch was used as an effective dispersant during the preparation of nanocrystalline [Formula: see text]-Al2O3 powders. X-ray diffraction (XRD), thermogravimetric differential thermal analysis (TG-DTA), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were employed to characterize the precursor AACH and products. The results show that nanosized spherical [Formula: see text]-Al2O3 powders without hard agglomeration and with particle size in the range of 20–40 nm can be obtained by the two methods. Comparing the two “green” processes, the mechanochemical method has better prospects for commercial production.

scholarly journals Morphology control of MnO2 nanoparticles: Effect of P123 polymer in ethanol-water system

2017 ◽  
Vol 23 (2) ◽  
pp. 245-249 ◽  
Author(s):  
Li Chen ◽  
Guoyan Luan
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Raw Materials ◽  
Water System ◽  
The Novel ◽  
X Ray Diffraction ◽  
Controllable Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Mno2 Nanoparticles

A series of MnO2 nanoparticles were synthesized by two-step reaction in the ethanol-water system with urea as reducing agent. During the novel routine, P123 polymer plays a crucial role in controlling the morphology. Then, characterization and systematic investigations of the samples by transmission electron microscopy and scanning electron microscopy confirmed that the morphology of MnO2 nanoparticles changed as the raw materials ratio changed. Finally, X-ray diffraction and X-ray photoelectron spectroscopy were employed to confirm the crystal structure and the exact components. These results indicated the particles showed a rod-like shape without P123 and changed into sheet-like shape after the addition of P123. Therefore, this idea could be developed for the controllable synthesis of other metal oxide-based nanomaterials.

scholarly journals Synthesis of GeSe2Nanobelts Using Thermal Evaporation and Their Photoelectrical Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Lijie Zhang ◽  
Hongfei Yu ◽  
Yun Yang ◽  
Keqin Yang ◽  
Youqing Dong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Thermal Evaporation ◽  
Building Blocks ◽  
Evaporation Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photoelectrical Properties ◽  
Transmission Electron ◽  
Narrow Belt

GeSe2nanobelts were synthesized via a simple thermal-evaporation process by using gold particles as catalyst and GeSe2flakes as starting materials. The morphology, crystal structure, and composition were characterized with scanning electron microscopy (SEM), high-resolution transmission electron microscopy (TEM), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). SEM micrographs show that most of GeSe2nanobelts have distinct segmented structures (wide belt, zigzag belt, and narrow belt). A possible mechanism was proposed for the growth of segmented nanobelts. It is possible that the growth of the segmented nanobelts is dominated by both vapor-liquid-solid and vapor-solid mechanisms. Devices made of single GeSe2nanobelt have been fabricated and their photoelectrical property has been investigated. Results indicate that these nanobelt devices are potential building blocks for optoelectronic applications.

Controlled Synthesis LaPO4 Nanorods via a Hydrothermal Route

2013 ◽  
Vol 873 ◽  
pp. 195-199
Author(s):  
Jie Dai ◽  
Kai Li Liu ◽  
Xia Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raw Materials ◽  
Morphological Changes ◽  
Photo Luminescence ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Scanning Electron

LaPO4nanorods have been selectively synthesized via a hydrothermal route, using La (NO3)3·6H2O and NaH2PO4as raw materials, without using any catalyst or template. X-ray diffraction (XRD), scanning electron microscopy (SEM), IR spectra (IR) and photo-luminescence (PL) spectra were used to characterize the as-prepared samples. The morphological changes of the products due to the different mole ratios of La (NO3)3·6H2O and NaH2PO4were studied. The effect of the thermal treatment on the structure of the LaPO4nanorods was also investigated. In addition, the emission intensity of LaPO4nanorods with different Eu doped concentration was compared and discussed.

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