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.

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.

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.

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.

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.

RAPID SYNTHESIS OF CoSb3/GRAPHENE NANOCOMPOSITES BY ONE-POT SOLVOTHERMAL ROUTE AND THEIR ELECTROCHEMICAL PROPERTIES

2012 ◽  
Vol 05 (01) ◽  
pp. 1250002
Author(s):  
YUN-XIAO ZHENG ◽  
JIAN XIE ◽  
SHUANG-YU LIU ◽  
WEN-TAO SONG ◽  
TIE-JUN ZHU ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Molar Ratio ◽  
Synthetic Approach ◽  
One Pot ◽  
Graphene Nanocomposites ◽  
X Ray ◽  
Solvothermal Route ◽  
Transmission Electron ◽  
Short Time

A facile synthetic approach for CoSb3 /graphene nanocomposite has been developed in this work. By adjusting Co/Sb molar ratio, reaction temperature, and reaction time, we found that nanocrystalline CoSb3 (5–10 nm) can form at a low temperature of 180°C and a short time of only 1 h via a one-pot solvothermal route. At the same time, graphite oxide can be reduced to graphene with uniformly loaded CoSb3 nanoparticles. The composites have been characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The nanocomposite shows improved cycling stability compared to bare CoSb3 .

scholarly journals Synthesis of Monodisperse Walnut-Like SnO2Spheres and Their Photocatalytic Performances

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jing Wang ◽  
Hui-qing Fan ◽  
Hua-wa Yu
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Reaction ◽  
Raw Materials ◽  
Time Dependent ◽  
Uniform Size ◽  
X Ray ◽  
Methylene Orange ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
One Step

Novel walnut-like SnO2spheres have been synthesized using a one-step hydrothermal reaction with SnCl2·2H2O and KOH as raw materials. The morphology, microstructure, and optical properties of the products were characterized by X-ray powder diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and ultraviolet-visible (UV-Vis) absorption spectroscopy. The detailed studies revealed that these synthesized spheres are highly monodisperse and have a uniform size of approximately 250 nm. Photocatalytic activity of the prepared SnO2spheres was evaluated by the degradation of methylene orange. The synthesized SnO2spheres exhibited excellent photocatalytic degradation. In addition, a possible formation mechanism of the walnut-like nanostructures was proposed based on reaction time-dependent experiments.

Biomolecule-Assisted Synthesis of Ribbon-Like Sb2S3 Nanostructure

2010 ◽  
Vol 97-101 ◽  
pp. 2144-2147
Author(s):  
Xin Yu Yang ◽  
Wei Dong Xiang ◽  
Xi Yan Zhang ◽  
Hai Tao Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Sulfur Source ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Scanning Electron

L-Cystine was successfully used as a novel kind of sulfur source to synthesize the nanostructure of ribbon-like Sb2S3. The nanoribbons were usually tens of micronmeters in length, typically 100-300 nm in width. The nanostructure of ribbon-like Sb2S3 were examined using diverse techniques including X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected-area electron diffraction, and high-resolution TEM.

MICROWAVE-ASSISTED HYDROTHERMAL SYNTHESIS, OPTICAL AND ELECTROCHEMICAL PROPERTIES OF AgBi(MoO4)2 NANOSPHERES

2013 ◽  
Vol 06 (02) ◽  
pp. 1350011 ◽  
Author(s):  
LEI ZHANG ◽  
JUN-SEN DAI ◽  
LIN LIAN ◽  
YIN LIU
Keyword(s):  
Electron Microscopy ◽  
Experimental Result ◽  
Reduction Peak ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Absorption Edge Energy ◽  
Hydrothermal Approach

In this paper, we report the successful synthesis of novel AgBi(MoO4)2 nanospheres via a simple, rapid and reliable microwave-assisted hydrothermal approach, employing AgNO3 , Bi(NO3)3 ⋅ 5H2O and Na2MoO4 ⋅ 2H2O as starting materials. The phases and morphologies of the products were characterized by powder X-ray diffraction (XRD), energy dispersive spectrometry (EDS), X-ray photoelectron spectrum (XPS), selected area electron diffraction (SAED), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Optical property of the product gives the value of optical absorption edge energy to be 2.88 eV. Moreover, experimental result showed that obvious increase of the reduction peak was observed employing AgBi(MoO4)2 /GCE as working electrode in the presence of H2O2 molecule, which indicated that the as-prepared AgBi(MoO4)2 nanospheres exhibited excellent electrocatalytic activity to H2O2 .

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