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Nanowire Structure (nanowire + structure)

Distribution by Scientific Domains

Chemistry	71%

Selected Abstracts

Synthesis and Characterization of Colloidal Core,Shell Semiconductor Nanowires

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 27 2010
Zhen Li
Abstract CdSe colloidal nanowires, generated from solution-liquid-solid approach, have been coated with CdS rods (or ribbons) by using cadmium hexadecyl xanthate (Cd-HDX) as a single source precursor. The use of different solvents and ligands causes pronounced effects on the morphology of the nanowires. The coating process includes nucleation and growth of CdS nanorods onto the core CdSe nanowires, followed by ripening of the CdS nanorods to produce the desired core-shell nanowire structure. [source]

ZnO nanowire arrays , Pattern generation, growth and applications

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 10 2010
Margit Zacharias
Abstract ZnO nanowires and related materials are in the focus of attention for electronic, optical or sensor applications. However, size, position and arrangement control are essential conditions for the development of future nanowire based devices. Various kinds of template methods including nanosphere lithography and UV laser interference lithography are powerful tools for the preparation of the starting metal catalyst arrays and will be demonstrated and discussed. However, only if the growth mechanism and its guiding parameters are understood in detail, the template will force a pattern arranged growth of nanowires. The paper gives an overview of the various kinds of growth modes for vertical arranged nanowires. Specific experimental conditions establishing the VS or the VLS growth are discussed. In addition, insight is given why the patterning is not all the time conserved and how to overcome these obstacles. In the second part different kinds of applications are summarized. Electronic properties are discussed based on metal,semiconductor,metal devices. The influence of a core,shell nanowire structure on the optical properties is demonstrated. In addition, a simple approach for ZnO nanowire based gas sensors is discussed and shown. As a last example, the transfer of Al2O3 coated nanowires into spinel tubes is reported. [source]

Preparation of a Nanowire-Structured Polyaniline Composite and Gas Sensitivity Studies

CHEMISTRY - A EUROPEAN JOURNAL, Issue 12 2006
Xingfa Ma Dr.
Abstract To obtain organic nanowire sensors with high sensitivity and rapid response times, based on the inducement effect of surfactants during in situ polymerization, nanostructured polyaniline composites are obtained by using a chemical oxidation method by adding a small amount of surfactant. A casting method is employed on interdigitated carbon electrodes. The gas sensitivity to a series of chemical vapors is examined at room temperature. The results indicate that polyaniline with regular nanowire structure is obtained when succinic acid is added. The gas sensitivity and response rates of a film with nanowire structure are much better than those of conventional polyaniline films produced by means of organic solution spin coating methods. The film described in this work shows good selectivity to trimethylamine and other related gases and, the reaction being reversible with the ues of high-purity nitrogen. [source]

Quantum Dots Arrangement and Energy Transfer Control via Charge-Transfer Complex Achieved on Poly(Phenylene Ethynylene)/Schizophyllan Nanowires

CHEMISTRY - AN ASIAN JOURNAL, Issue 9 2009
Tomohiro Shiraki
Abstract Assemblies of organic and inorganic compounds in the nanoscale region have contributed to the development of novel functional materials toward future applications, including sensors and opto-electronics. We succeed in fabricating hybrid nanowires composed of a conjugated polymer and semiconductor quantum dots (QDs) by a supramolecular assembly technique. The 1-D fashion of the nanowire structure is obtained by the polymer wrapping of cationic poly(phenylene ethynylene) (PPE) with helix-forming polysaccharide schizophyllan (SPG). The electrostatic interaction between cationic PPE and anionic QDs affords the nanowires decorated with QDs. Upon addition of an acceptor molecule, tetranitrofluorenone (TNF), the charge-transfer (CT) complex between PPE and TNF is formed, resulting in energy transfer from the QDs to PPE arising from the induced spectral overlap. Furthermore, the employment of the conjugated polymer allows highly sensitive quenching of the QD's emission by raising the transmission efficiency to the CT complexed electron deficient sites along the polymer backbone. [source]

Cover Picture: Dendritic Nanowire Growth Mediated by a Self-Assembled Catalyst (Adv. Mater.

ADVANCED MATERIALS, Issue 5 2005
5/2005)
Abstract The dendritic nanostructures shown on the cover background were generated by self-assembled Mn clusters deposited from the vapor phase during vapor,liquid,solid growth of InAs nanowires. By carefully controlling the timing and amount of the Mn precursor, on p.,598 Lauhon and co-workers demonstrate a route to the formation of ordered hierarchical nanowire structures shown from various perspectives in the cover insets. [source]

Endohedral carbon chains in chiral single-wall carbon nanotubes

INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Issue 11 2006
Ravi K. Vadapalli
Abstract Using a first-principles, local density functional approach, we report the bond length optimization of endohedral linear carbon chains. In these calculations, all-carbon nanowire structures were constructed by inserting cumulenic linear carbon chains inside the semiconducting (7,3) and metallic (7,4) single-wall carbon nanotubes with radii of ,0.35 nm. Our calculations show that the total energy results for the endohedral chains inside both (7,3) and (7,4) nanotubes are well described with a common total energy curve having an equilibrium bond length of ,0.129 nm. The electronic band structures of the carbon nanowires are described in terms of a rigid-band model, with the Fermi level for the carbon nanowire effectively pinned near the top of bands originating from the valence band of the single-wall nanotube. © 2006 Wiley Periodicals, Inc. Int J Quantum Chem, 2006 [source]