Morphology Controllable Preparation of Gold Nanoplates through an Eco-Friendly Wet-Chemical Route

2014 ◽  
Vol 887-888 ◽  
pp. 108-111
Author(s):  
Zao Yi ◽  
Jiang Shan Luo ◽  
Xi Bo Li ◽  
Yong Yi ◽  
Xi Bin Xu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Photoelectron Spectroscopy ◽  
Molar Ratio ◽  
Chemical Route ◽  
X Ray ◽  
Transmission Electron ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
Controllable Preparation

In this paper a simple eco-friendly wet-chemical way was mentioned to synthesize gold nanoplates. The prepared of the gold nanoplates was a seedless process that carried out by mixing HAuCl4 aqueous solution and Tannic acid (TA) solution at room temperature without the other surfactant and capping agents. The scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) have been used to characterize the shape and composition the prepared gold nanoplates. The molar ratio of HAuCl4 and TA can control the shape and the size of gold nanoplates effectively. This research can provide a simple and eco-friendly way for the prepared gold nanoplates in aqueous solution.

Thiol-Capped CdSe and CdTe Nanoclusters: Synthesis by a Wet Chemical Route, Structural and Optical Properties

1998 ◽  
Vol 536 ◽  
Author(s):  
A. L. Rogach ◽  
A Eychmüller ◽  
J. Rockenberger ◽  
A. Kornowski ◽  
H. Weller ◽  
...  
Keyword(s):  
Particle Size ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Chemical Route ◽  
X Ray ◽  
Stabilizing Agents ◽  
Transmission Electron ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
X Ray Absorption

AbstractCdSe and CdTe nanoclusters were formed in aqueous solutions at moderate temperatures by a wet chemical route in the presence of thiols as effective stabilizing agents. The nature of the stabilizing agent (thioalcohols or thioacids) had an important influence on the particle size and largely determined the photoluminescence properties. The nanoclusters were characterized by means of UV-vis absorption and photoluminescence spectroscopy, powder X-ray diffraction, high resolution transmission electron microscopy, and extended X-ray absorption fine structure measurements. CdSe and CdTe nanoclusters were crystalline, in the cubic zincblende phase, with mean sizes in the range of 2 to 5 nm depending on the preparative conditions and the postpreparative size-selective fractionation, and showed pronounced electronic transitions in the absorption spectra. Thioglycerol-stabilized CdTe nanoclusters possessed sharp band-egde photoluminescence being tunable with particle size.

scholarly journals Heterogeneous Fenton-like oxidation of p-hydroxybenzoic acid using Fe/CeO2-TiO2 catalyst

2019 ◽  
Vol 79 (7) ◽  
pp. 1276-1286 ◽  
Author(s):  
Tijani Hammedi ◽  
Mohamed Triki ◽  
Mayra G. Alvarez ◽  
Jordi Llorca ◽  
Abdelhamid Ghorbel ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Catalytic Properties ◽  
Molar Ratio ◽  
Hydroxybenzoic Acid ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Temperature Programmed

Abstract This paper is built on the Fenton-like oxidation of p-hydroxybenzoic acid (p–HBZ) in the presence of H2O2 and 3%Fe supported on CeO2-TiO2 aerogels under mild conditions. These catalysts were deeply characterized by X-ray diffraction (XRD), hydrogen temperature programmed reduction (H2-TPR), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and X-ray photoelectron spectroscopy (XPS). The effect of thermal treatment, pH (2–3, 5, 7), H2O2/p–HBZ molar ratio (5, 15, 20, 25) and reaction temperature (25 °C, 40 °C and 60 °C) on the catalytic properties of supported Fe catalysts are studied. Our results highlight the role of CeO2 and the calcination of the catalyst to obtain the highest catalytic properties after 10 min: 73% of p–HBZ conversion and 52% of total organic carbon (TOC) abatement.

scholarly journals Impact of Mg2+ and Zn2+ Addition on the Structural, Morphological, Physicochemical, Dielectric and Biological Properties of Hydroxyapatite

2021 ◽  
Author(s):  
Anandhan Narayanasamy ◽  
Panneerselvam Ramaswamy ◽  
Poonguzhali Ramaswamy ◽  
Amali Roselin Arockiam ◽  
Joseph Panneerdoss Issac ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Bone Growth ◽  
Chemical Precipitation ◽  
Biological Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Wet Chemical ◽  
Wet Chemical Precipitation

Abstract In the present work, the wet-chemical precipitation technique is employed to prepare Zinc/Magnesium doped hydroxyapatite (HAP). In doped HAP, the X-ray diffraction peak shifts to a higher angle because of the contraction of the lattice parameters along a - axis. The Raman peaks at 519, 440, 1464 cm-1 indicate the presence of Mg, Zn and CO32- in doped HAP respectively. The Field Emission Scanning Electron Microscopy (FESEM) measures the grain size of pure, 5% Zn and 5% Mg doped HAP, as 275, 510, and 251 nm respectively. Transmission Electron Microscopy (TEM) confirmed the morphological change in HAP. The X-ray photoelectron spectroscopy (XPS) identifies the presence of Mg2+ and Zn2+ in doped HAP. The dopant elevates the hardness and dielectric constant, so the strength and the bone growth of HAP increases. All the doped samples show excellent antibacterial, antifungal and antibiofilm activities than the pure HAP.

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.

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 Simultaneous adsorption and reduction of hexavalent chromium on biochar-supported nanoscale zero-valent iron (nZVI) in aqueous solution

2020 ◽  
Vol 82 (7) ◽  
pp. 1339-1349
Author(s):  
Fengfeng Ma ◽  
Bakunzibake Philippe ◽  
Baowei Zhao ◽  
Jingru Diao ◽  
Jian Li
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Photoelectron Spectroscopy ◽  
Zero Valent Iron ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
X Ray ◽  
Transmission Electron ◽  
Nanoscale Zero Valent Iron ◽  
Pseudo Second Order

Abstract Flax straw biochar (FSBC)-supported nanoscale zero-valent iron (nZVI) composite (nZVI-FSBC) combining the advantages of nZVI and biochar was synthesized and tested for Cr(VI) removal efficiency from aqueous solution. Surface morphology and structure of FSBC and nZVI-FSBC were characterized by scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller techniques, which help to clarify the mechanism of Cr(VI) removal from aqueous solution. The adsorption of Cr(VI) onto FSBC and nZVI-FSBC was best described by the pseudo-second-order and the Sips model. Compared with FSBC, nZVI-FSBC remarkably improved the performance in removing Cr(VI) under identical experimental conditions. Due to the collaborative effect of adsorption and reduction of nZVI-FSBC, the adsorption capacity of nZVI-FSBC for Cr(VI) is up to 186.99 mg/g. The results obtained by XPS, XRD, and FTIR confirmed that adsorption and reduction dominated the processes of Cr(VI) removal by nZVI-FSBC. As a supporter, FSBC not only improved the dispersion of nZVI, but also undertook the adsorption task of Cr(VI) removal. The surface oxygen-containing functional groups of nZVI-FSBC mainly participated in the adsorption part, and the nZVI promoted the Cr(VI) removal through the redox reactions. These observations indicated that the nZVI-FSBC can be considered as potential adsorbents to remove Cr(VI) for environment remediation.

[TiH2 · (MgCl2 · 2 THF)0.2 – 0.3] – der naßchemische Weg zu einem hochreaktiven Titanhydrid / [TiH2 · (MgCl2 · 2 THF)0.2 – 0.3] -the Wet Chemical Route to a Highly Reactive Titanium Hydride

1995 ◽  
Vol 50 (4) ◽  
pp. 476-482 ◽  
Author(s):  
Beate Becker ◽  
Borislav Bogdanović
Keyword(s):  
Solid State ◽  
Organic Solvents ◽  
Titanium Hydride ◽  
Magnesium Hydride ◽  
Molar Ratio ◽  
Chemical Route ◽  
X Ray ◽  
Wet Chemical ◽  
Wet Chemical Route

The reaction between catalytically prepared magnesium hydride (MgH2*) and [TiCl3(THF)3] in a molar ratio of 1.5:1 in THF yields a highly pyrophoric, X -ray amorphous titanium hydride precipitate with the composition [TiH2 ·(MgCl2 · 2 THF)0.2 - 0.3] (2). This novel titanium hydride has been characterized through hydrolysis and iodolysis, as well as through thermolysis to Ti* and H2 in the solid state and in organic solvents. 2 is slightly soluble in THF and proves itself as an active reagent in a variety of reactions.

ONE-POT SYNTHESIS OF Sb2Se3 NANOWIRES USING SELENIUM DIOXIDE AS THE SELENIUM PRECURSOR IN AIR AND THEIR CHARACTERIZATION

2013 ◽  
Vol 12 (05) ◽  
pp. 1350040
Author(s):  
MINGFU YE ◽  
TINGEING YI ◽  
LIXIN XU ◽  
GUOCHANG CHEN ◽  
YUNCHAO LI ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Orthorhombic Phase ◽  
High Quality ◽  
One Pot ◽  
Chemical Route ◽  
X Ray ◽  
Transmission Electron

Orthorhombic phase of antimony triselenide ( Sb 2 Se 3) nanowires have been obtained by a facile and effective one-pot noninjection chemical route with controllable shape and size. The synthesis, which uses SeO 2 as the selenium precursor and can be conducted in air, is suitable for the larger-scale industrial synthesis of high-quality nanocrystals at low cost. The as-prepared nanocrystals were extensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). We believe that the method present here is a more straightforward and cost-effective route to prepare Sb 2 Se 3 nanocrystals with high quality. The band-edge positions of the Sb 2 Se 3 nanocrystals are studied by cyclic voltammetry (CV).

Wet Chemical Synthesis of SnS/Graphene Nanocomposites for High Performance Supercapacitor Electrodes

2017 ◽  
Vol 17 (01n02) ◽  
pp. 1760022 ◽  
Author(s):  
Syamsai Ravuri ◽  
Chandan Abhishek Pandey ◽  
R. Ramchandran ◽  
Soon Kwan Jeon ◽  
Andrews Nirmala Grace
Keyword(s):  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Chemical Route ◽  
Graphene Nanocomposites ◽  
X Ray ◽  
Wet Chemical Synthesis ◽  
Transmission Electron ◽  
Discharge Duration ◽  
Wet Chemical ◽  
Charge Discharge

A series of SnS/Graphene (SnS/G) nanocomposites at various concentrations of graphene were synthesized by a wet chemical route and the prepared composites were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), High Resolution Transmission Electron Microscopy (HRTEM) for its structural and morphological investigation. Results show that the prepared SnS nanoparticles in the composite are [Formula: see text]30[Formula: see text]nm sized and uniformly dispersed on graphene sheets. To test the supercapacitance behavior, electrochemical measurements were carried out in 6[Formula: see text]M KOH electrolyte. A maximum specific capacitance of 984[Formula: see text]F/g was observed for SnS/G-c at 5[Formula: see text]mVs[Formula: see text] scan rate. Galvanostatic charge/discharge curves showed an excellent cyclic stability with higher charge/discharge duration, and hence could be used for high performance supercapacitor applications.

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