A Practical Method for the Large-Scale Synthesis of Diastereomerically Pure (2R,5S)- 3-Phenyl-2-(8-quinolinoxy)- 1,3-diaza-2-phosphabicyclo-[3.3.0]-octane Ligand (QUIPHOS). Synthesis and X-ray Structure of Its Corresponding Chiral π-Allyl Palladium Complex

1999 ◽  
Vol 64 (24) ◽  
pp. 8940-8942 ◽  
Author(s):  
Jean Michel Brunel ◽  
Thierry Constantieux ◽  
Gérard Buono
Keyword(s):  
Large Scale ◽  
Palladium Complex ◽  
Practical Method ◽  
X Ray ◽  
Large Scale Synthesis

scholarly journals Facile and Large-scale Synthesis of Defective Black TiO2−x(B) Nanosheets for Efficient Visible-light-driven Photocatalytic Hydrogen Evolution

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1048 ◽  
Author(s):  
JingCheng Xu ◽  
JiaJia Zhang ◽  
ZhengYang Cai ◽  
He Huang ◽  
TianHao Huang ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Broad Band ◽  
Mass Ratio ◽  
X Ray ◽  
Black Tio2 ◽  
Large Scale Synthesis ◽  
Nabh4 Reduction

In the work, we firstly report the facile and large-scale synthesis of defective black TiO2−x(B) nanosheets via a dual-zone NaBH4 reduction method. The structure, physico-chemical, and optical properties of TiO2−x(B) nanosheets were systematically characterized by powder X-ray diffraction, Raman spectroscopy, UV-Vis absorption spectroscopy, and X-ray photoelectron spectroscopy, etc. The concentration of Ti3+ can be well tuned by NaBH4 reduction. With increasing the mass ratio of NaBH4 to TiO2(B), the generation of Ti3+ defects gives rise to the increased intensity of a broad band absorption in the visible wavelength range. It is demonstrated that the TiO2−x(B) photocatalyst synthesized with the mass ratio of NaBH4 to TiO2(B) of 3:1 exhibited an optimum photocatalytic activity and excellent photostability for hydrogen evolution under visible-light irradiation. By combining the advantages of 2D TiO2(B) nanosheets architecture with those of Ti3+ self-doping and simultaneous production of oxygen vacancy sites, the enhanced photocatalytic performance of the defective TiO2−x(B) nanosheets was achieved.

Large-Scale Synthesis of Nickel Sulfide for Electronic Device Applications

MRS Advances ◽  
2020 ◽  
Vol 5 (52-53) ◽  
pp. 2727-2735
Author(s):  
Nidhi ◽  
Tashi Nautiyal ◽  
Samaresh Das
Keyword(s):  
Thin Film ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Electronic Device ◽  
Electrical Performance ◽  
High Quality ◽  
X Ray ◽  
Device Applications ◽  
Large Scale Synthesis ◽  
Group 10

AbstractSeveral techniques have been employed for large-scale synthesis of group 10 transition metal dichalcogenides (TMDCs) based on platinum and palladium for nano- and opto-electronic device applications. Nickel Sulphides (NixSy), belonging to group 10 TMDC family, have been widely explored in the field of energy storage devices such as batteries and supercapacitors, etc. and commonly synthesized through the solution process or hydrothermal methods. However, the high-quality thin film growth of NixSy for nanoelectronic applications remains a central challenge. Here, we report the chemical vapor deposition (CVD) growth of NiS2 thin film onto a two-inch SiO2/Si substrate, for the first time. Techniques such as X-ray photoelectron spectroscopy, X-ray Diffraction, Raman Spectroscopy, Scanning Electron Microscopy, have been used to analyse the quality of this CVD grown NiS2 thin film. A high-quality crystalline thin film of thickness up to a few nanometres (~28 nm) of NiS2 has been analysed here. We also fabricated a field-effect device based on NiS2 thin film using interdigitated electrodes by optical lithography. The electrical performance of the fabricated device is characterized at room temperature. On applying the drain voltage from -2 to +2 V, the device shows drain current in the range of 10-9 A before annealing and in the range of 10-6 A after annealing. This, being comparable to that from devices based on MoS2 and other two-dimensional materials, projects CVD grown NiS2 as a good alternative material for nanoelectronic devices.

The Production of Reduced Graphene Oxide by a Low-Cost Vacuum System for Supercapacitor Applications

2018 ◽  
Vol 930 ◽  
pp. 609-612
Author(s):  
Quezia Cardoso ◽  
Franks Martins Silva ◽  
Ligia Silverio Vieira ◽  
Julio Cesar Serafim Casini ◽  
Solange Kazume Sakata ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Large Scale ◽  
Low Cost ◽  
High Vacuum ◽  
Cost Effective ◽  
Practical Method ◽  
Raw Material ◽  
Vacuum System ◽  
X Ray ◽  
Pump Pressure

Graphene has attracted significant interest because of its excellent electrical properties. However, a practical method for producing graphene on a large scale is yet to be developed. Graphene oxide (GO) can be partially reduced to graphene-like sheets by removing the oxygen-containing groups and recovering the conjugated structure. GO can be produced using inexpensive graphite as the raw material via cost-effective chemical methods. High vacuum and temperature (10−7 mbar and 1100°C, respectively) conditions are well-known to enable the preparation of reduced powder at the laboratory scale. However, a large-scale high vacuum reduction system that can be routinely operated at 10−7 mbar requires considerable initial capital as well as substantial operational and maintenance costs. The current study aims at developing an inexpensive method for the large-scale reduction of graphene oxide. A stainless steel vessel was evacuated to backing-pump pressure (10−2 mbar) and used to process GO at a range of temperatures. The reduction of GO powder at low vacuum pressures was attempted and investigated by X-ray diffraction and Fourier transform infrared spectroscopy. The experimental results of processing GO powder at various temperatures (200–1000°C) at relatively low pressures are reported. The microstructures of the processed materials were investigated using scanning electron microscopy and chemical microanalyses via energy dispersive X-ray analysis.

Large Scale Synthesis of 5-amino-2,4,6-triiodoisophthalic Acid: A Key Intermediate for Iodinated X-ray Contrast Agents

2018 ◽  
Vol 8 (2) ◽  
pp. 304-314
Author(s):  
Kesamreddy Ranga Reddy ◽  
Emani Vijayabhaskar Reddy ◽  
J V Shanmukha Kumar
Keyword(s):  
Contrast Agents ◽  
Large Scale ◽  
X Ray ◽  
Large Scale Synthesis

Antiviral activity of arylnaphthalene and aryldihydronaphthalene lignans

2000 ◽  
Vol 78 (5) ◽  
pp. 553-561 ◽  
Author(s):  
Christopher Cow ◽  
Carmen Leung ◽  
James L Charlton
Keyword(s):  
Natural Products ◽  
Antiviral Activity ◽  
Human Cytomegalovirus ◽  
Large Scale ◽  
Practical Method ◽  
The Common ◽  
Large Scale Synthesis ◽  
Regioselective Reactions

A practical method for large scale synthesis of 1-arylnaphthalene and 1-aryl-1,2-dihydronaphthalene lignans is described. The method makes use of the classic Stobbe condensation followed by regioselective reactions that provide access to both the common and retrolactone lignans, e.g., 2 and 3. A total of 25 compounds, many of which are known natural products, were prepared and their antiviral activity against human cytomegalovirus measured.Key words: lignan, Stobbe, arylnaphthalene, antiviral.

Large-scale synthesis of amorphous phosphorus nitride imide nanotubes with high luminescent properties

2005 ◽  
Vol 20 (2) ◽  
pp. 325-330 ◽  
Author(s):  
Qixun Guo ◽  
Qing Yang ◽  
Lei Zhu ◽  
Chengqi Yi ◽  
Yi Xie
Keyword(s):  
Electron Microscope ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Luminescent Properties ◽  
Atomic Ratio ◽  
Binding Energies ◽  
X Ray ◽  
Microscope Images ◽  
Large Scale Synthesis ◽  
20 Nm

A facile solvothermal approach was successfully developed for the large-scale synthesis of amorphous phosphorus nitride imide (H3xP3N5+x) nanotubes with high luminescent properties by the reaction of 1,3,5-hexachlorotriphosphazene (P3N3Cl6) with sodium amide (NaNH2) at low temperatures. Transmission electron microscope images showed that the inner diameter of nanotubes is 120 ± 20 nm, wall thickness is 40 ± 10 nm, and length ranges from several to ten micrometers. Scanning electron microscope images revealed that the proportion of the nanotubes exceeds 90%. X-ray photoelectron spectroscopy spectra indicated that the binding energies of P2p and N1s are 133.30 and 398.40 eV, respectively, and the atomic ratio of P:N is 3:5.13. The infrared spectra of the sample are comparable to those of the reported HPN2 and HP4N7. Thermogravimetric analysis revealed that the product is very robust in a nonoxidizing atmosphere. The structure and the optical properties of the product and the annealed samples were investigated by x-ray diffraction and photoluminescence measurements, respectively.

Large-Scale Synthesis of Bi2S3Nanodots as a Contrast Agent for In Vivo X-ray Computed Tomography Imaging

2011 ◽  
Vol 23 (42) ◽  
pp. 4886-4891 ◽  
Author(s):  
Kelong Ai ◽  
Yanlan Liu ◽  
Jianhua Liu ◽  
Qinghai Yuan ◽  
Yangyang He ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agent ◽  
Large Scale ◽  
Computed Tomography Imaging ◽  
X Ray ◽  
Tomography Imaging ◽  
X Ray Computed ◽  
Large Scale Synthesis

LARGE SCALE SYNTHESIS OF Ag2S NANOWIRES AND THEIR ELECTRICAL CHARACTERIZATION

2012 ◽  
Vol 11 (01) ◽  
pp. 1250012 ◽  
Author(s):  
VIJAY KUMAR ◽  
SANJEEV KUMAR ◽  
S. K. CHAKARVARTI
Keyword(s):  
Morphological Study ◽  
Large Scale ◽  
Electrical Characterization ◽  
Silver Sulfide ◽  
X Ray Diffraction ◽  
Pure Silver ◽  
Alumina Membrane ◽  
X Ray ◽  
Silver Compound ◽  
Large Scale Synthesis

In this paper, large scale synthesis of Ag2S nanowires having diameter 100 nm using chemical reaction is reported. Nanochannels in anodic alumina membrane were utilized as templates. Scanning electron microscopy was used for morphological study of nanowires. X-ray diffraction depicted the monoclinic nature of Ag2S nanowires. Energy dispersive X-ray fluorescence recommended that the nanowires are of pure silver sulfide rather than any silver compound. Nonlinear I–V characteristics were observed for Ag/Ag2S/Ag heterostructures.

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