scholarly journals Hydrothermal Synthesis, Characterization, and Optical Properties of Ce Doped Bi2MoO6Nanoplates

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Anukorn Phuruangrat ◽  
Nuengruethai Ekthammathat ◽  
Budsabong Kuntalue ◽  
Phattranit Dumrongrojthanath ◽  
Somchai Thongtem ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Photoelectron Spectroscopy ◽  
Hydrothermal Reaction ◽  
Growth Direction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Uv Visible ◽  
Bending Modes

Undoped and Ce doped Bi2MoO6samples were synthesized by hydrothermal reaction at 180°C for 20 h. Phase, morphology, atomic vibration, and optical properties were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrophotometry, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and UV-visible spectroscopy. In this research, the products were orthorhombic Bi2MoO6nanoplates with the growth direction along the [0b0], including the asymmetric and symmetric stretching and bending modes of Bi–O and Mo–O. Undoped and Ce doped Bi2MoO6samples show a strong absorption in the UV region.

Hydrothermal Synthesis and Characterization of Ho Doped Bi2MoO6 Nanoplates and their Optical Properties

2014 ◽  
Vol 931-932 ◽  
pp. 231-234 ◽  
Author(s):  
Anukorn Phuruangrat ◽  
Nuengruethai Ekthammathat ◽  
Budsabong Kuntalue ◽  
Phattharanit Dumrongrojthanath ◽  
Somchai Thongtem ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Hydrothermal Reaction ◽  
Visible Region ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Uv Visible ◽  
Bending Modes

0–3 % Ho doped Bi2MoO6 samples were synthesized by hydrothermal reaction at 180 °C for 20 h. Their phase, morphologies, atomic vibration and optical properties were characterized by X-ray powder diffraction (XRD), Raman spectrophotometry, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and UV-visible spectroscopy. In this research, the products were orthorhombic Bi2MoO6 nanoplates with asymmetric and symmetric stretching and bending modes of MoO6 octahedrons, and their strong absorption in the UV visible region.

scholarly journals One-Pot Synthesis of Titanate Nanotubes Decorated with Anatase Nanoparticles Using a Microwave-Assisted Hydrothermal Reaction

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Suziete B. S. Gusmão ◽  
Anupama Ghosh ◽  
Thalles M. F. Marques ◽  
Odair P. Ferreira ◽  
Anderson O. Lobo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Hydrothermal Reaction ◽  
Titanate Nanotubes ◽  
One Pot ◽  
X Ray ◽  
Microwave Assisted ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Anatase Nanoparticles

A nanoheterostructure of titanate nanotubes decorated with anatase nanoparticles (TiNT@AnNP) was synthesized for the first time by a microwave-assisted hydrothermal one-pot reaction. Characterization by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, selected-area electron diffraction, and X-ray photoelectron spectroscopy showed highly crystalline and nanometer-sized TiNT@AnNP. The synthesized TiNT@AnNP degraded an anionic dye (Remazol blue) more efficiently under UV-visible light (380–780 nm) than a commercial anatase-TiO2 precursor. We correlated this increased efficiency of photodegradation to the large surface area and the efficient separation of photoinduced electron-hole pairs. Finally, we propose a mechanism to highlight the influence of a microwave-assisted hydrothermal synthesis in the production of TiNT@AnNP for environmental applications.

Synthesis and optical properties of composites based on ZnS nanoparticles embedded in layered magadiite

Clay Minerals ◽  
2013 ◽  
Vol 48 (5) ◽  
pp. 739-748 ◽  
Author(s):  
Yufeng Chen ◽  
Gensheng Yu
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Interlayer Space ◽  
Transmission Spectra ◽  
Zns Nanoparticles ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Photoluminescence Enhancement ◽  
Properties Of Composites

AbstractComposites based on ZnS nanparticles embedded in layered magadiite were synthesized via a three step process : protonation of Na-magadiite, ion exchange in order to introduce Zn(NH3)42+ in the interlayer space, and addition of Na2S to form ZnS particles in the interlayer space of magadiite. The composites obtained were characterized by X-ray power diffraction (XRD), Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (SEM-EDS), Transmission Electron Microscopy (TEM), Raman spectroscopy, Photoluminscence spectra (PL), and UV-visible transmission spectra (UV-vis). Results indicated that ZnS nanoparticles embedded in magadiite presented different optical properties and photoluminescence enhancement properties compared with those of uncovered ZnS particles (without host magadiite).

The Optical Properties of β-Cyclodextrin-Assisted Synthesize Worm-Like Ag2S by One Step Hydrothermal Method

2018 ◽  
Vol 53 ◽  
pp. 7-12
Author(s):  
Mao Hua Li ◽  
Xiao Fei Li ◽  
Wen Sheng Ran ◽  
Bo Yang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Hydrothermal Reaction ◽  
Silver Sulfide ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Light Region ◽  
Visible Spectra ◽  
One Step

The worm-like morphology of silver sulfide (Ag2S) was successfully prepared via hydrothermal reaction at 150°C by using silver nitrate (AgNO3) and thioacetamide(CH3CSNH2) as both the sliver sources and sulfur sources, β-cyclodextrin as the template agent, and water as the solvent. The worm-like of Ag2S are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), x-ray photoelectronspectroscopy (XPS), energy dispersivex-ray (EDX), high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SEAD). Ultraviolet-visible spectra (UV-vis) and photoluminescencespectroscopy (PL) were used in an optical study of the products. The results showed that the existence of β-cyclodextrin is crucial to the formation of worm-like Ag2S, and the optoelectronics test results showed that the sample have a broad absorption in ultraviolet and visible light region.

scholarly journals A novel WC–W2C composite synthesis by arc plasma melt cast technique: microstructural and mechanical studies

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
N. Nayak ◽  
T. Dash ◽  
D. Debasish ◽  
B. B. Palei ◽  
T. K. Rout ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Arc Plasma ◽  
Micro Computed Tomography ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Bet Analysis ◽  
Cast Technique

AbstractWC–W2C composites of three different compositions have been synthesized from mixture of WC + W (0, 5 and 16 wt% W) by thermal arc plasma melt-cast technique. Various grown phases observed in the composites consisting of major phases of WC and W2C and minor phases of unbound C (graphite) and tungsten (W) were confirmed by X-ray diffraction, selected area electron diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared studies. Transmission electron microscopy and field emission scanning electron microscopy show polycrystalline nature of composites. Energy dispersive spectroscopy (of X-ray) infers the absence of any impurity in the composite. Almost porous free nature of composites were observed from X-ray micro computed tomography and BET analysis studies. WC–W2C composite (16 wt% W) shows 25% and 21% higher micro hardness (2535 VHN) and Young’s modulus (625 GPa) values than that of pure melt cast WC sample.

Hydrothermal Synthesis of Calcium Borate Whiskers

2011 ◽  
Vol 399-401 ◽  
pp. 693-697 ◽  
Author(s):  
Shuang Jie Song ◽  
Xue Ying Nai ◽  
Wu Li ◽  
Cheng Cai Zhu ◽  
Qing Fen Meng
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Reaction ◽  
Saed Pattern ◽  
Calcium Borate ◽  
Crystal Water ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
O Phase ◽  
Morphology Changes

A type of calcium borate whiskers with highly thermal stability was synthesized by hydrothermal method at 180 °C for 2 h, using borax, calcium chloride and sodium hydroxide as raw reactants. The X-ray powder diffraction (XRD) indicated that as-prepared products were composed of monoclinic Ca2B2O5·H2O phase. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed calcium borate whiskers with a length of 50~100 μm and diameter 1.0 ~3.0 μm. Selected-area electron diffraction (SAED) pattern showed that the calcium borate whiskers were single crystalline structure. The adjustment of temperature of hydrothermal reaction, can lead to obvious morphology changes of products, and the possible chemical reaction and growth mechanism were proposed. Furthermore, the analysis of thermogravimetry (TG) showed the calcium borate whiskers released crystal water at 370~425 °C.

Synthesis and Optical Properties of L-Cysteine Hydrochloride-Stabilized CdSe Nanocrystals in a New Alkali System

2008 ◽  
Vol 8 (3) ◽  
pp. 1178-1182 ◽  
Author(s):  
Bin Feng ◽  
Feng Teng ◽  
Ai-Wei Tang ◽  
Yan Wang ◽  
Yan-Bing Hou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Optical Properties ◽  
Photoelectron Spectroscopy ◽  
Water Soluble ◽  
Molar Ratio ◽  
Cdse Nanocrystals ◽  
X Ray ◽  
Transmission Electron ◽  
Cysteine Hydrochloride

Water-soluble CdSe nanocrystals were synthesized in a new alkali system at lower temperatures by using L-cysteine hydrochloride as a stabilizer and Na2SeSO3 as a selenium source to enable the synthesis of CdSe nanocrystals in a wider range of pHvalues. The CdSe nanocrystal powder was characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy. We systematically investigated the effect of synthesis conditions on the optical properties of the L-cysteine hydrochloride-stabilized CdSe nanocrystals, and found that different sizes of CdSe nanocrystals can be obtained by changing the pHvalue, the molar ratio of L-cysteine hydrochloride to Cd2+, or the refluxing time. The emission maxima of the obtained CdSe nanocrystals can be tuned in a wider range from 477 to 575 nm by changing the pHvalue from 7 to 13. We observed an obvious blue-shift of the absorption and photoluminescence peak position by varying the molar ratio of L-Cys to Cd2+ from 3.5:1 to 2:1 at the same pHvalue. The size of the obtained nanocrystals increased and the full width at half maximum became narrower as reflux time increased. Transmission electron microscopy images indicate that the as-prepared CdSe nanocrystals have a good dispersion, which means that L-cysteine hydrochloride can control the grouping of CdSe nanocrystals excellently as a stabilizer in the new alkali system.

scholarly journals Zirconia Reduced Graphene Oxide Nano-Hybrid Structure Fabricated by the Hydrothermal Reaction Method

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 687 ◽  
Author(s):  
Anton Smirnov ◽  
Nestor Washington Solís Pinargote ◽  
Nikita Peretyagin ◽  
Yuri Pristinskiy ◽  
Pavel Peretyagin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Hydrothermal Reaction ◽  
Hybrid Structure ◽  
X Ray ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Nanocomposite Powders

In this work, we report an available technique for the effective reduction of graphene oxide (GO) and the fabrication of nanostructured zirconia reduced graphene oxide powder via a hydrothermal method. Characterization of the obtained nano-hybrid structure materials was carried out using a scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR). The confirmation that GO was reduced and the uniform distribution of zirconia nanoparticles on graphene oxide sheets during synthesis was obtained due to these techniques. This has presented new opportunities and prospects to use this uncomplicated and inexpensive technique for the development of zirconia/graphene nanocomposite powders.

Phase Sensitive Behavior and Optical Properties of Cu0.45Mn0.55O2 Nanoparticles

2012 ◽  
Vol 548 ◽  
pp. 110-114 ◽  
Author(s):  
Qurat Ul Ain Javed ◽  
Feng Ping Wang ◽  
M. Yasir Rafique ◽  
M. Zubair Iqbal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Visible Spectrum ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Detailed Characteristic ◽  
Direct Band ◽  
Phase Sensitive ◽  
Uv Visible

In this work, we have reported a facile approach to fabricate the new Cu0.45Mn0.55O2 nanoparticles with novel properties. The detailed characteristic of the nanoparticles have been performed by X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-visible spectroscopy. HRTEM and SAED measurements point out that the nanoparticles are phase sensitive during exposure to electron beam irradiation and undergo a reversible transition from single crystal to polycrystalline. UV-visible spectrum indicates the direct band gap of 1.4eV as well as more than 80% transparency in UV region.

scholarly journals Preparation of Al2O3 and AlN Nanotubes by Atomic Layer Deposition

2012 ◽  
Vol 1408 ◽  
Author(s):  
Cagla Ozgit ◽  
Fatma Kayaci ◽  
Inci Donmez ◽  
Engin Cagatay ◽  
Tamer Uyar ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Atomic Layer Deposition ◽  
Photoelectron Spectroscopy ◽  
Atomic Layer ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Layer Deposition ◽  
High Resolution Tem ◽  
Uniform Wall

ABSTRACTAl2O3 and AlN nanotubes were fabricated by depositing conformal thin films via atomic layer deposition (ALD) on electrospun nylon 66 (PA66) nanofiber templates. Depositions were carried out at 200°C, using trimethylaluminum (TMAl), water (H2O), and ammonia (NH3) as the aluminum, oxygen, and nitrogen precursors, respectively. Deposition rates of Al2O3 and AlN at this temperature were ∼1.05 and 0.86 Å/cycle. After the depositions, Al2O3- and AlN-coated nanofibers were calcinated at 500°C for 2 h in order to remove organic components. Nanotubes were characterized by using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). AlN nanotubes were polycrystalline as determined by high resolution TEM (HR-TEM) and selected area electron diffraction (SAED). TEM images of all the samples reported in this study indicated uniform wall thicknesses.

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