Nanocrystalline Alloys of II-VI Semiconductors from Molecular Multi-Layer Templates

1999 ◽  
Vol 581 ◽  
Author(s):  
L. Cristofolini ◽  
P. Facci ◽  
M.P. Fontana
Keyword(s):  
Raman Spectroscopy ◽  
Fatty Acid ◽  
Chemical Composition ◽  
Electronic Properties ◽  
Size Control ◽  
Fine Tuning ◽  
Synthesis And Characterization ◽  
Mixed Composition ◽  
Micro Raman Spectroscopy

ABSTRACTWe present the synthesis and characterization of nanocrystalline II-VI semiconductors of mixed composition (CdSe/ZnSe, CdS) grown in fatty acid Langmuir-Schaefer multi-layer templates. The controlled production of i) homogeneous nanocrystalline CdxZn1−xSe alloys and ii) heterogeneous mixtures of different pure composition II-VI semiconductors such as CdSe and ZnSe provides, in addition to the size control, the parameter of the chemical composition for the fine tuning of the electronic properties. The samples are characterized bty optical and quasi-resonance micro-Raman spectroscopy.

Synthesis and characterization of CuO/C catalyst for the esterification of free fatty acid in rubber seed oil

Fuel ◽  
2014 ◽  
Vol 120 ◽  
pp. 195-201 ◽  
Author(s):  
Huei Ruey Ong ◽  
Maksudur R. Khan ◽  
M.N.K. Chowdhury ◽  
Abu Yousuf ◽  
Chin Kui Cheng
Keyword(s):  
Fatty Acid ◽  
Free Fatty Acid ◽  
Seed Oil ◽  
Synthesis And Characterization ◽  
Rubber Seed Oil ◽  
Rubber Seed

scholarly journals Synthesis and Optoelectronic Properties of Iptycene–Naphthazarin Dyes

Synlett ◽  
2018 ◽  
Vol 30 (01) ◽  
pp. 54-58 ◽  
Author(s):  
Timothy Swager ◽  
Cagatay Dengiz ◽  
You-Chi Wu
Keyword(s):  
Single Crystal ◽  
Electronic Properties ◽  
Diels Alder ◽  
Optoelectronic Properties ◽  
Synthesis And Characterization ◽  
Nmr Analysis ◽  
X Ray ◽  
Vis Spectroscopy

We report the synthesis and characterization of iptycene–naphthazarin dyes by using a sequential Diels–Alder approach. The tautomerization of naphthazarin was used as the key step in the synthesis, with structures confirmed by single-crystal X-ray and NMR analysis. The systematic trends in electronic properties were investigated by UV/Vis spectroscopy. BF2 complexes of the dyes were prepared by reaction with BF3·OEt2 in CH2Cl2.

scholarly journals Nanocrystalline alloys: synthesis and characterization of non-stoichiometric Co2FeAl nanocrystals

2016 ◽  
Vol 94 (4) ◽  
pp. 367-372 ◽  
Author(s):  
Lana T. Huynh ◽  
Stephanie N. Bonvicini ◽  
Arthur C. Pinon ◽  
Simon Trudel
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Magnetic Measurements ◽  
Size Control ◽  
Synthesis And Characterization ◽  
Spintronic Devices ◽  
Transmission Electron ◽  
Metal Acetylacetonate ◽  
Capping Ligands

Non-stoichiometric Co2FeAl nanoparticles are formed by the in-solution thermal decomposition of the corresponding metal acetylacetonate complexes in the presence of capping ligands followed by reduction of the obtained material under an H2-containing atmosphere. Transmission electron microscopy indicates that sub-100 nm nanoparticles are obtained, with reasonable size control. Magnetic measurements indicate that the saturation magnetization, Bloch behavior, magnetization reversal, spin-wave stiffness, and exchange stiffness are all comparable to those observed for bulk and thin-film Co2FeAl, indicating that these nanomaterials are promising for use in nanoparticle-based spintronic devices.

XRD, SEM/EDX and micro-Raman spectroscopy for mineralogical and chemical characterization of iron slags from the Roman archaeological site of Forua (Biscay, North Spain)

2018 ◽  
Vol 138 ◽  
pp. 246-254 ◽  
Author(s):  
Haizea Portillo ◽  
Maria Cruz Zuluaga ◽  
Luis Angel Ortega ◽  
Ainhoa Alonso-Olazabal ◽  
Xabier Murelaga ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Characterization ◽  
Archaeological Site ◽  
Micro Raman Spectroscopy

scholarly journals Micro-Raman Spectroscopy, a Powerful Technique Allowing Sure Identification and Complete Characterization of Asbestiform Minerals

2019 ◽  
Vol 9 (15) ◽  
pp. 3092 ◽  
Author(s):  
Caterina Rinaudo ◽  
Alessandro Croce
Keyword(s):  
Raman Spectroscopy ◽  
Crystal Surface ◽  
Complete Characterization ◽  
Mineral Phase ◽  
Asbestos Fibers ◽  
Micro Raman Spectroscopy ◽  
Fibrous Minerals ◽  
Iron Sulphate ◽  
Asbestiform Minerals

Micro-Raman spectroscopy has been applied to fibrous minerals regulated as “asbestos”—anthophyllite, actinolite, amosite, crocidolite, tremolite, and chrysotile—responsible of severe diseases affecting mainly, but not only, the respiratory system. The technique proved to be powerful in the identification of the mineral phase and in the recognition of particles of carbonaceous materials (CMs) lying on the “asbestos” fibers surface. Also, erionite, a zeolite mineral, from different outcrops has been analyzed. To erionite has been ascribed the peak of mesothelioma noticed in Cappadocia (Turkey) during the 1970s. On the fibers, micro-Raman spectroscopy allowed to recognize many grains, micrometric in size, of iron oxy-hydroxides or potassium iron sulphate, in erionite from Oregon, or particles of CMs, in erionite from North Dakota, lying on the crystal surface. Raman spectroscopy appears therefore to be the technique allowing, without preparation of the sample, a complete characterization of the minerals and of the associated phases.

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