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Transport Technique (transport + technique)

Distribution by Scientific Domains

Polymers and Materials Science	50%

Selected Abstracts

Positive magnetoresistance in TixW1-xSe2 (x = 0, 0.03) platelet crystals

CRYSTAL RESEARCH AND TECHNOLOGY, Issue 10 2006
Sunil Kunjachan
Abstract Layered transition metal dichalcogenide crystal, WSe2, has been grown by direct vapour transport technique. Titanium is used as a dopant in to the 2H type MX2 matrix. These crystals show positive magnetoresistance and a switching behaviour is observed at room temperature in the titanium-intercalated sample. The relative resistance change due to magnetic field for the doped sample is found to switch from 23.6% to 39.6% when the sample is rotated through 0° to 90°. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Growth and characterization of FexMn1-xIn2Se4 (0 , x , 1) single crystals

CRYSTAL RESEARCH AND TECHNOLOGY, Issue 10-11 2005
G. Attolini
Abstract Single crystals of Mn1-xFexIn2Se4 with 0 , x , 1.0 were grown by chemical vapor transport technique using I2 as transporting agent. The resulting crystals appeared as brilliant black plates. X-ray powder diffraction data could be indexed following the hexagonal structure with space group Rm for the low Fe concentration samples, while the high concentration sample is associated to the space group P63mc. Both polytypes have similar parameters, however the c parameter reduces as the Fe concentration increases, therefore the number of anion slabs decreases. The characterization of the crystals was based on morphological observations and optical absorption as a function of temperature. The obtained energy gap for the samples at different Fe concentrations suggested that they behave as direct energy gap semiconductors. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Micrometer- and Nanometer-Sized, Single-Crystalline Ribbons of a Cyclic Triphenylamine Dimer and Their Application in Organic Transistors

ADVANCED MATERIALS, Issue 16 2009
Rongjin Li
A cyclic triphenylamine dimer with high crystallinity is demonstrated. Micrometer- and nanometer-sized single-crystalline ribbons are easily produced by a physical vapor transport technique. Field-effect transistors of the ribbons exhibit mobilities up to 0.05,cm2 V,1 s,1. The mobility of the devices depends greatly on the size of the ribbons: the smaller the ribbons, the higher the mobility. [source]

Comparison of Coupling Methods for Linking Between Reactor and Feature Scales

CHEMICAL VAPOR DEPOSITION, Issue 1-3 2010
Jonathan Jilesen
Abstract Currently there are two main methods used for coupling macroscopic reactor-scale and microscopic feature-scale models in multi-scale CVD simulation. These methods differ in the plane selected for coupling. With one method, coupling occurs at a source plane offset from the deposition surface, while in the other method coupling occurs on the deposition surface itself. The two methods also have different feature-scale modeling techniques associated with them. A Monte Carlo (MC) technique is used for the source plane-coupling method, while a ballistic transport technique is used for the deposition surface-coupling method. In this study a multi-scale code with a ballistic feature-scale model is modified so that both coupling methods can be applied, allowing for direct comparison of the two coupling methods. [source]