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48 results on '"Yuan, Yu"'

2. ChemInform Abstract: Diamond Nanowires: Fabrication, Structure, Properties, and Applications

Author

Yuan Yu, Jinfang Zhi, and Liangzhuan Wu

Subjects
Fabrication, Chemistry, Material properties of diamond, Wide-bandgap semiconductor, Nanowire, Modulus, Diamond, Nanotechnology, General Medicine, Carbon nanotube, engineering.material, law.invention, Thermal conductivity, law, engineering
Abstract

Diamond is a wide band gap semiconductor exhibiting a combination of superior properties, such as negative electron affinity, chemical inertness, high Young’s modulus, the highest hardness and room-temperature thermal conductivity, etc. It is possible to control and enhance the fundamental properties of diamond by fabricating 1D diamond nanowires, due to the giant surface-to-volume ratio enhancements of 1D nanowires. Although theoretical comparisons with carbon nanotubes have shown that diamond nanowires are energetically and mechanically viable structures, reproducibly synthesizing the crystalline diamond nanowires has remained challenging. In this chapter, we present a comprehensive, up-to-date review for the diamond nanowires, wherein we will give a discussing for their synthesis along with their structures, properties and applications.

Published
2015

10. ChemInform Abstract: An Oxidized Oligothiophene That Forms π-Stacks

Author

Yuan Yu, Larry L. Miller, and Yaoliang Hong

Subjects
Solvent, chemistry.chemical_compound, Chemistry, Potassium ferrocyanide, General Medicine, Cyclic voltammetry, Conductivity, Anisotropy, Spectroscopy, Photochemistry, Evaporation (deposition), Anode
Abstract

A dimethoxyterthiophene, substituted in the terminal α-positions with thioacetate groups, was synthesized and characterized. It was studied using cyclic voltammetry, ESR and optical spectroscopy in water solvent. A stable cation radical was formed using anodic or potassium ferrocyanide oxidation. In water the cation radical was aggregated into π-stacks, as signified by an optical conduction band in the NIR, shifts in the Vis π-π ∗ bands and an anisotropic ESR signal. This is the first example of such oligothiophene π-stacks. Evaporation of the water from an oxidized sample gave a black solid which had a four-point-probe conductivity as a pressed pellet of 10 −3 S cm −1 . Thus, oligothiophenes have been shown to provide molecular conductors and the possible importance of π-stacks in polythiophenes has been reinforced.

Published
2010

11. ChemInform Abstract: Spectra and Reactivity of Methoxyoligothiophene Cation Radicals

Author

Larry L. Miller, Esmir Gunic, Baruch Zinger, and Yuan Yu

Subjects
endocrine system, Stereochemistry, Radical, Dimer, General Medicine, Random hexamer, Electrochemistry, Oligomer, Thiophene derivatives, Spectral line, chemistry.chemical_compound, chemistry, Polymer chemistry, Reactivity (chemistry)
Abstract

A set of α-coupled oligothiophenes, dimer through hexamer, was studied. Each oligomer was terminated with two methyl groups and was substituted with two or four methoxy groups. Electrochemical stud...

Published
2010

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