Microwave-Assisted Hydrothermal Preparation of SnO2/MoS2 Composites and their Electrochemical Performance

NANO ◽  
2016 ◽  
Vol 11 (02) ◽  
pp. 1650023 ◽  
Author(s):  
Lin Ma ◽  
Xiaoping Zhou ◽  
Limei Xu ◽  
Xuyao Xu ◽  
Lingling Zhang
Keyword(s):  
Electron Microscopy ◽  
Synergetic Effect ◽  
Electrochemical Performances ◽  
Microwave Method ◽  
X Ray Diffraction ◽  
Hydrothermal Preparation ◽  
X Ray ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Mean Size

We introduce a two-step hydrothermal and microwave method to prepare novel SnO2/MoS2 composites. The as-prepared samples are well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The experimental results indicate that the SnO2/MoS2 composites are composed of MoS2 nanosheets and ultrafine SnO2 nanoparticles with mean size of 3–4[Formula: see text]nm which are well-distributed and anchored on the surface of MoS2 nanosheets. The resultant composites demonstrate prominently improved electrochemical performances, which could be attributed to the unique and robust microstructures and synergetic effect between MoS2 and SnO2.

Rapid Synthesis of Uniform CdSe Nanorods by a Microwave-Assisted Solvothermal Method in Ethylenediamine

2020 ◽  
Vol 20 (10) ◽  
pp. 6495-6499
Author(s):  
Maokun Han ◽  
Ruijuan Qi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solvothermal Method ◽  
X Ray Diffraction ◽  
Rapid Synthesis ◽  
X Ray ◽  
Microwave Assisted ◽  
Aspect Ratios ◽  
Transmission Electron ◽  
Cdse Nanorods

A rapid microwave-assisted solvothermal method is reported for the synthesis of uniform CdSe nanorods in ethylenediamine (EDA) using CdCl2 and elemental Se as reactants. The resultant nanorods have a diameter of approximately 10 nm and a length of approximately 300 nm. Our experiments show that the concentrations of EDA and CdCl2 play important roles in product morphology. The well-dispersed CdSe nanorods with high aspect ratios were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), UV-vis absorption and photoluminescence (PL).

scholarly journals Relationship between Crystal Shape, Photoluminescence, and Local Structure inSrTiO3Synthesized by Microwave-Assisted Hydrothermal Method

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Luís F. da Silva ◽  
Waldir Avansi ◽  
Mário L. Moreira ◽  
Alexandre Mesquita ◽  
Lauro J. Q. Maia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Method ◽  
Spherical Particles ◽  
Lower Amount ◽  
X Ray Diffraction ◽  
Edge Structure ◽  
X Ray ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
X Ray Absorption

This paper describes the effect of using different titanium precursors on the synthesis and physical properties of SrTiO3powders obtained by microwave-assisted hydrothermal method. X-ray diffraction measurements, X-ray absorption near-edge structure (XANES) spectroscopy, field emission scanning electron microscopy (FE-SEM), and high-resolution transmission electron microscopy (HRTEM) were carried out to investigate the structural and optical properties of the SrTiO3spherical and cubelike-shaped particles. The appropriate choice of the titanium precursor allowed the control of morphological and photoluminescence (PL) properties of SrTiO3compound. The PL emission was more intense in SrTiO3samples composed of spherelike particles. This behavior was attributed to the existence of a lower amount of defects due to the uniformity of the spherical particles.

scholarly journals Hydrothermal Preparation of Ag/Ag1.69Sb2.27O6.25 Sesame-Hollow-Ball-Type Nanocomposites: The Formation Mechanism of Metallic Ag in the Ag-H2O System at 400 K

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Haomei Liu ◽  
Xihai Hao ◽  
Yuejun Liu ◽  
Aiguo Yan
Keyword(s):  
Electron Microscopy ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Hydrothermal Preparation ◽  
Transmission Electron ◽  
Ag Particles ◽  
Mean Size ◽  
One Step ◽  
Chemical States ◽  
Hollow Ball

Ag/Ag1.69Sb2.27O6.25 sesame-hollow-ball-type nanocomposites were prepared via a facile one-step hydrothermal method at 400 K. Power X-ray diffraction analysis shows that all diffraction peaks were well consistent with JCPDS card no: 89-6552 of Ag1.69Sb2.27O6.25. Scanning electron microscopy and high-resolution transmission electron microscopy images of the composites indicate that some smaller metallic Ag particles with size∼18.3 nm uniformly dense on the surface of Ag1.69Sb2.27O6.25 hollow nanospheres with a mean size of about 170 nm, producing Ag/Ag1.69Sb2.27O6.25 hollow-sesame-ball nanocomposites. The surface chemical state of Ag/Ag1.69Sb2.27O6.25 is investigated by XPS, and all peaks of Ag 3d, O 1s, and Sb 3d show their different chemical states. The BET surface area of the sample is 7.268 m2/g, and the pore sizes of nanocomposites are more than 5 nm. The light absorption property of as-prepared materials is studied by UV-vis/DRS, and the adsorption band is located at 445 nm, and the estimated energy band gap (Eg) is 2.55 eV. The calculated partial φ-pH diagrams in the Ag-H2O system at 400 K predict that the Ag+ ion can react with H2 to form metallic Ag.

scholarly journals Модификация структурно-морфологических свойств германия в многослойной нанопериодической структуре Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-/Ge с промежуточными слоями Si при отжиге

2021 ◽  
Vol 55 (10) ◽  
pp. 882
Author(s):  
М.В. Байдакова ◽  
Н.А. Берт ◽  
В.Ю. Давыдов ◽  
А.В. Ершов ◽  
А.А. Левин ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Annealing Temperature ◽  
Electron Beam Evaporation ◽  
X Ray Diffraction ◽  
Bimodal Size Distribution ◽  
X Ray ◽  
Transmission Electron ◽  
Mean Size ◽  
The Mean

Multi-layered nanosized Al2O3/Ge/Si structures manufactured by electron-beam evaporation and annealed at a temperature within the range 700−900◦C are examined using transmission electron microscopy, Raman spectroscopy and X-ray diffraction techniques. The periodic structure with a good layer planarity is confirmed to retain after heat treatment up to 900◦C. At an annealing temperature above 700◦C, nanocrystallites with a bimodal size distribution start to form within initially amorphous Ge layers, the mean size of small crystallites being determined by Ge layer thickness and annealing temperature. An essential loss of Ge from multi-layered structure after 900oC anneal and development of Ge1−x Six solid solution with x up to 0.07 in the nanocrystallites is revealed.

Hydrothermal Preparation of Ag/TiO2/GO Nanocomposites with Ammonia-Treated Graphene Oxide for Enhanced Conductivity

2020 ◽  
Vol 20 (11) ◽  
pp. 6698-6702
Author(s):  
Bo-Kyung Choi ◽  
Woong-Ki Choi ◽  
Jong-Hyun Park ◽  
Soo-Jin Park ◽  
Min-Kang Seo
Keyword(s):  
Electron Microscopy ◽  
Nitrogen Doping ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Hydrothermal Preparation ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Transmission Electron ◽  
Enhanced Conductivity

In this study, Ag/TiO2/GO nanocomposites were successfully fabricated by a facile hydrothermal method. Nitrogen-doped GO was prepared using ammonia treatment to improve its conductivity. The Ag/TiO2/GO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS), zeta potential, and photoluminescence spectroscopy (PL). A homogeneous dispersion of Ag/TiO2 nanoparticles was shown on the surface of GO. Increasing the nitrogen doping concentration increased hydrophilicity, thereby improving the conductivity of Ag/TiO2/GO nanocomposites.

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 .

scholarly journals Microwave-assisted synthesis, characterization and photoluminescence of shuttle-like BaMoO4 microstructure

2015 ◽  
Vol 33 (3) ◽  
pp. 537-540 ◽  
Author(s):  
Anukorn Phuruangrat ◽  
Budsabong Kuntalue ◽  
Titipun Thongtem ◽  
Somchai Thongtem
Keyword(s):  
Electron Microscopy ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Scanning Electron ◽  
Ft Ir Spectroscopy

Abstract Shuttle-like BaMoO4 microstructure has been successfully synthesized from Ba(N03)2·4H20 and Na2MoO4·2H2O as starting materials in ethylene glycol solvent containing 20 mL 5 M NaOH by microwave radiation at 180 W for 30 min. The as- synthesized BaMoO4 product was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Raman spectrophotometry, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photolumines­cence (PL) spectroscopy. XRD patterns revealed that the products was tetragonal BaMoO4 phase. SEM and TEM characteriza­tion showed that the product had a shuttle-like BaMoO4 microstructure. PL of the shuttle-like BaMoO4 microstructure showed a maximum emission at 466 nm excited by 280 nm wavelength.

Hydrothermal Prepared α-MnO2 Nanowire and its Supercapacitor Electrochemical Performances

2014 ◽  
Vol 953-954 ◽  
pp. 1040-1044
Author(s):  
Yang Li ◽  
Jing Li ◽  
Hua Qing Xie
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electrode Material ◽  
Scan Electron Microscopy ◽  
Active Material ◽  
Electrochemical Performances ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Potential Alternative

α-MnO2nanowire was prepared by hydrothermal method. The structure of as-prepared manganese oxide demonstrated tetragonal crystalline in X-ray diffraction pattern. Scan electron microscopy (SEM) and Transmission electron microscopy (TEM) revealed the nanowire morphology of as-prepared α-MnO2. The band gap of α-MnO2was estimated at about 2.06 eV via UV-vis spectrum. As the electrode active material for supercapacitor, the electrochemical specific capacitance of α-MnO2nanowire achieved 156.5 F/g, which possessed typical capacitive behaviors and good cycling stabilities. Based on the preferable electrochemical performances, as-synthesized α-MnO2nanowire may be a potential alternative as electrode material for supercapacitor.

Microwave Assisted Reflux Synthesis and Characterization of Magnetic Fe3O4 Micro Bubbles Embed in Nano Particles

2013 ◽  
Vol 763 ◽  
pp. 12-16
Author(s):  
Saba Jamil ◽  
Xiao Yan Jing ◽  
Jun Wang ◽  
Song Nan Li ◽  
Jing Yuan Liu
Keyword(s):  
Electron Microscopy ◽  
Nano Particles ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Small Nanoparticles ◽  
Scanning Electron

Magnetic Fe3O4 nanobubbles surrounded by nanoparticles are prepared by adopting microwave assisted reflux method. The nanomagnetic particles surrounded by small beads like particles are fabricated by irradiating the prepaperd sample solutions by microwave radiations coupled with reflux method simultaneously at 90°C for 45 mins. The characterization of the prepared Fe3O4 particles are carried out by using x ray diffraction, scanning electron microscopy and transmission electron microscopy. The instrumentations shows the morphology that is thick walled bubble like with approximate diameter of about 300 nm to 400 nm surrounded by small nanoparticles of 5 nm to 30 nm in range. The particles are bubbles like and some broken bubbles showed that these might be hollow from inside.

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