Biomolecule Assisted Hydrothermal Synthesis of Chainlike Network of Silver Sulfide Nanostructures

2008 ◽  
Vol 8 (2) ◽  
pp. 986-992
Author(s):  
Subhajit Biswas ◽  
Subhadra Chaudhuri
Keyword(s):  
Critical Role ◽  
Silver Sulfide ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
Complexing Agent ◽  
Sulfur Source ◽  
X Ray Diffraction ◽  
Tree Model ◽  
Hydrothermal Route ◽  
Experimental Parameters

A L-cysteine assisted hydrothermal route has been utilized for the growth of Ag2S nanostructures with chainlike network. It was observed that the experimental parameters such as the synthesis temperature and variation in the molar ratio of the anionic and cationic precursors play critical role in determining the morphology and crystal structure of the products. X-ray diffraction study revealed the formation of monoclinic acanthite Ag2S. L-cysteine was acting as complexing agent as well as sulfur source. The branching fractal morphology was explained through Cayley tree model and structure of L-cysteine.

Solvothermal Synthesis of CdS Nanorods: Role of Basic Experimental Parameters

2007 ◽  
Vol 7 (2) ◽  
pp. 677-688 ◽  
Author(s):  
Anuja Datta ◽  
Soumitra Kar ◽  
Jay Ghatak ◽  
Subhadra Chaudhuri
Keyword(s):  
Synthesis Temperature ◽  
Molar Ratio ◽  
Sulfur Source ◽  
Solvothermal Process ◽  
Filling Fraction ◽  
Cds Nanorods ◽  
Wide Range ◽  
Experimental Parameters ◽  
Crystalline Nature

CdS nanorods with varying dimensions were synthesized by solvothermal process. It was observed that the anions present with the Cd-salts play an important role in determining the dimensions of the CdS nanorods. The crystalline nature of the sources was found to play a crucial role in determining the phase of the products. The nature of the sulfur source, molar ratio of the precursors, filling fraction of the solvent, and the synthesis temperature play important role in defining the size and shape of the products. By controlling the experimental parameters it was possible to control the dimension of the CdS nanorods within a certain range (diameter of the nanorods could be varied within a wide range from ∼7 to 100 nm by varying the temperature within 100–250 °C). Optical absorption, photoluminescence, and Raman studies of these samples were carried out to characterize the CdS nanorods.

Controlled Synthesis of Different Morphologies of SrWO4 Crystals via a Surfactant-Assisted Hydrothermal Precipitation Method

2013 ◽  
Vol 785-786 ◽  
pp. 449-454
Author(s):  
Yan Zhao ◽  
Chun Yan Wu ◽  
Dan Qin ◽  
Xin Lai ◽  
Si Wu ◽  
...  
Keyword(s):  
Ph Value ◽  
Precipitation Method ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Experimental Parameters ◽  
Infrared Spectrometer ◽  
Luminescent Spectra ◽  
Hydrothermal Precipitation ◽  
Surfactant Assisted

SrWO4 octahedrons, flowers, bundles, ellipsoids and dendrites had been successfully synthesized via surfactant-assisted method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photo-luminescent spectra techniques (PL) and fourier transrform infrared spectrometer (FTIR). By through various comparison experiments, it can be found that some related experimental parameters including the reagent concentration, [Sr2+]/[WO42-] molar ratio (R), aging temperature and the pH value had great influences on morphology of the products.

Synthesis and sintering of SiC under high pressure and high temperature

1999 ◽  
Vol 14 (3) ◽  
pp. 906-911 ◽  
Author(s):  
S. K. Bhaumik ◽  
C. Divakar ◽  
S. Usha Devi ◽  
A. K. Singh
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
High Pressure ◽  
Silicon Powder ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microscopic Studies ◽  
Simultaneous Synthesis

Starting from elemental powders, simultaneous synthesis and compaction of SiC were conducted at 3 GPa pressure and temperatures in the range 2100–2900 K. The sintered compacts were characterized by x-ray diffraction, microhardness measurements, and microscopic studies. The efficiency of formation of SiC was dependent on the particle size of the silicon powder, crystallinity of the reactant carbon, molar ratio of silicon and carbon, and synthesis temperature and time. Carbon in excess of the stoichiometric amount was required to obtain compacts free from residual silicon. The SiC samples, with a Si: C molar ratio 1: 1.05, prepared at 2100 K for 300 s had a density and hardness of 3.21 g/cm3 (98.8% of theoretical density) and 22 GPa, respectively. The crystal structure of the SiC depended on the synthesis temperature. Pure β–SiC in the temperature range 2100–2500 K, and a mixture of α– and β–SiC above 2500 K were obtained. The β–SiC was highly crystalline and nearly defect-free.

scholarly journals Synthesis and characterization of Architecturally Modified Mesoporous-microporous MFI (Mobil Five) Zeolite with enhanced catalytic activity

2021 ◽  
Author(s):  
Dhanju Mani Pathak ◽  
Pankaj Kumar Ghosh ◽  
Kishor Kr Shah ◽  
Anup K Talukdar
Keyword(s):  
Carbon Black ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Mass Ratio ◽  
X Ray Diffraction ◽  
Silica Alumina ◽  
Carbon Mass ◽  
Mfi Zeolites ◽  
Adsorption Desorption

Abstract Four samples MFI zeolites were synthesized in presence of carbon black particles with silica-alumina molar ratio of 100 and different silica to carbon mass ratio under autogeneous pressure without adding any promoter or organic solvent. The synthesis temperature and duration of crystallization were 473K and 16h respectively. A sample of MFI was also synthesized without adding carbon black under similar condition. The synthesized samples were characterized by different techniques such as X- ray diffraction, FT-IR spectroscopy, Scanning electron microscopy, TGA and N2 adsorption desorption. The samples exhibit high crystallinity. The particle size ranged from 2.8 to 7.3 µm. Mesopore to micropore ratios was found to increase with increasing silicon to carbon mass ratio. These structurally modified meso-micro zeolite showed enhanced activity in the benzyl alcohol esterification reaction.

SYNTHESIS AND FIELD EMISSION PROPERTIES OF SnS2 AND In-DOPED SnS2 WITH HIERARCHICAL STRUCTURE

NANO ◽  
2011 ◽  
Vol 06 (05) ◽  
pp. 489-496 ◽  
Author(s):  
H. X. ZHONG ◽  
C. X. WANG
Keyword(s):  
Electron Microscopy ◽  
Field Emission ◽  
Photoelectron Spectroscopy ◽  
Sulfur Source ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Transmission Electron

A simple hydrothermal route was employed to prepare flower-like SnS2 and In -doped SnS2 by using biomolecular L-cysteine as sulfur source. The synthetic samples were characterized by X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy in detail. Furthermore, the field emission from both the materials was investigated, it was found that both of them have excellent field emission properties, and the doped In has enhanced the field emission properties.

An Efficient Removal of Rhodamine B in Water by Targeted Adsorption on SnS2 Nanosheets

2011 ◽  
Vol 356-360 ◽  
pp. 1708-1711
Author(s):  
Xi Li ◽  
Jian Zhu ◽  
Fu Jian Lv ◽  
Jin Guo Wang ◽  
Zong Li Xie ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Sulfur Source ◽  
Xps Analysis ◽  
X Ray Diffraction ◽  
Efficient Removal ◽  
Hydrothermal Route ◽  
X Ray ◽  
Strong Adsorption ◽  
Scanning Electron

Two kinds of SnS2 materials were prepared through the hydrothermal route, respectively using thioacetamide (TAA) and thiourea as the sulfur source. The as-prepared SnS2 samples were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2-sorption. The results showed that the SnS2 sample prepared with TAA had a lengthening shape, a smaller size and surface area, but a better adsorption of rhodamine B (RhB). X-ray photoelectron spectroscopy (XPS) analysis was used to confirm that there was an interaction between RhB molecule and SnS2 contributing to the strong adsorption of RhB.

Synthesis of NiS–Graphene Nanocomposites and its Electrochemical Performance for Supercapacitors

2017 ◽  
Vol 17 (01n02) ◽  
pp. 1760021 ◽  
Author(s):  
Chandan Abhishek Pandey ◽  
Syamsai Ravuri ◽  
R. Ramachandran ◽  
R. Santhosh ◽  
Sourav Ghosh ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Electrochemical Analysis ◽  
Sulfur Source ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Surface Attachment ◽  
Graphene Nanocomposites ◽  
X Ray ◽  
Long Cycle Life ◽  
Electrochemical Capacity

The aim of this work is to synthesize nickel sulfide–graphene (NiS/G) nanocomposites with different compositions and to analyze the structural and electrochemical capacity and compatibility for their application as supercapacitor material with enhanced charge storage capacity and reduced impedance. NiS nanoparticles (NPs) loaded on graphene were synthesized at various concentrations of graphene by a simple hydrothermal route from nickel sulphate and graphene oxide as precursors in the presence of PVP as surfactant and thioacetamide (TAA) as sulfur source. The composites structural, morphological and physical properties were analyzed by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy (XPS) and Fourier Transform-infrared (FT-IR) analysis. SEM measurements showed the presence of surface attachment of the NiS NPs onto the graphene sheets. To assess the properties of the nanocomposites for their applicability in supercapacitors, electrochemical analysis was carried out in 6[Formula: see text]M KOH electrolyte. Three different samples with different graphene contents — GNiS-10 with 10 wt.%, GNiS-20 with 20 wt.% and GNiS-40 with 40 wt.% were prepared. The specific capacitances obtained for the nanocomposites were calculated to be 84.33[Formula: see text]F/g, 129.66[Formula: see text]F/g, 187.53[Formula: see text]F/g at 10[Formula: see text]mV/s scan rate, respectively. The EIS data showed that the loading of NiS NPs on graphene caused the reduction in impedance at high frequency and has a long cycle life (over 1000 cycles).

On the Properties of an Ion Conductive System Incorporated in Hybrid Films

2000 ◽  
Vol 628 ◽  
Author(s):  
G. González ◽  
P. J. Retuert ◽  
S. Fuentes
Keyword(s):  
Electrochemical Impedance ◽  
Ternary Phase Diagram ◽  
Lithium Perchlorate ◽  
Molar Ratio ◽  
Ionic Conductors ◽  
X Ray Diffraction ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene ◽  
High Degree

ABSTRACTBlending the biopolymer chitosan (CHI) with poly (aminopropilsiloxane) oligomers (pAPS), and poly (ethylene oxide) (PEO) in the presence of lithium perchlorate lead to ion conducting products whose conductivity depends on the composition of the mixture. A ternary phase diagram for mixtures containing 0.2 M LiClO4 shows a zone in which the physical properties of the products - transparent, flexible, mechanically robust films - indicate a high degree of molecular compatibilization of the components. Comparison of these films with binary CHI-pAPS nanocomposites as well as the microscopic aspect, thermal behavior, and X-ray diffraction pattern of the product with the composition PEO/CHI/pAPS/LiClO4 1:0.5:0.6:0.2 molar ratio indicates that these films may be described as a layered nanocomposite. In this composite, lithium species coordinated by PEO and pAPS should be inserted into chitosan layers. Electrochemical impedance spectroscopy measurements indicate the films are pure ionic conductors with a maximal bulk conductivity of 1.7*10-5 Scm-1 at 40 °C and a sample-electrode interface capacitance of about 1.2*10-9 F.

Effect of Hydrated Metal Salts on the Coordination Product of Cobalt(II) halide and PNP Type Ligand, 2,6-bis(di-tertbutylphosphinomethyl) pyridine

2018 ◽  
Author(s):  
Tasneem Siddiquee ◽  
Abdul Goni
Keyword(s):  
Metal Salts ◽  
Molar Ratio ◽  
Pincer Complexes ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Pincer Ligand ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry ◽  
Cobalt Center

Chemical treatment of CoX<sub>2</sub><b><sup>. </sup></b>6H<sub>2</sub>O (X = Cl, Br, I) with the potentially tridentate PNP pincer ligand 2,6-bis(di-<i>tert</i>-butylphosphinomethyl)pyridine in 1:1 molar ratio results in cobalt(II) halide-PNP pincer complexes. The effect of the hydrated metal source on molecular structure and geometry of the complexes was studied by single crystal X-ray diffraction analysis. The complexes are neutral and the cobalt center adopts a penta-coordinate system with potential atropisomerization. Within the unit cell there are two distinct molecules per asymmetric unit. One of the two phosphorus atoms in the PNP ligand was observed to be partially oxidized to phosphinoxide. Disorder in the structure reflects a mixture of square pyramidal and distorted tetrahedral geometry.

scholarly journals Photocatalytic Reduction of CO2 to Methanol Using a Copper-Zirconia Imidazolate Framework

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 346
Author(s):  
Sonam Goyal ◽  
Maizatul Shima Shaharun ◽  
Ganaga Suriya Jayabal ◽  
Chong Fai Kait ◽  
Bawadi Abdullah ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalyst Support ◽  
Oxidation Potential ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Optimum Parameters ◽  
Reduction Of Co2 ◽  
Enhanced Yield

A set of novel photocatalysts, i.e., copper-zirconia imidazolate (CuZrIm) frameworks, were synthesized using different zirconia molar ratios (i.e., 0.5, 1, and 1.5 mmol). The photoreduction process of CO2 to methanol in a continuous-flow stirred photoreactor at pressure and temperature of 1 atm and 25 °C, respectively, was studied. The physicochemical properties of the synthesized catalysts were studied using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectroscopy. The highest methanol activity of 818.59 µmol/L.g was recorded when the CuZrIm1 catalyst with Cu/Zr/Im/NH4OH molar ratio of 2:1:4:2 (mmol/mmol/mmol/M) was employed. The enhanced yield is attributed to the presence of Cu2+ oxidation state and the uniformly dispersed active metals. The response surface methodology (RSM) was used to optimize the reaction parameters. The predicted results agreed well with the experimental ones with the correlation coefficient (R2) of 0.99. The optimization results showed that the highest methanol activity of 1054 µmol/L.g was recorded when the optimum parameters were employed, i.e., stirring rate (540 rpm), intensity of light (275 W/m2) and photocatalyst loading (1.3 g/L). The redox potential value for the CuZrIm1 shows that the reduction potential is −1.70 V and the oxidation potential is +1.28 V for the photoreduction of CO2 to methanol. The current work has established the potential utilization of the imidazolate framework as catalyst support for the photoreduction of CO2 to methanol.

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