Home  About us  Contact
 

Gold Layer (gold + layer)

Distribution by Scientific Domains
Physics and Astronomy40%

Selected Abstracts

Bioelectronics: Induced SER-Activity in Nanostructured Ag,Silica,Au Supports via Long-Range Plasmon Coupling (Adv. Funct.

ADVANCED FUNCTIONAL MATERIALS, Issue 12 2010
Mater.
The picture shows a nanostructured layered silver-silica-gold electrode developed by J.-J. Feng, I. M. Weidinger, et al. on page 1954 where the underlying silver surface can be excited by laser light. The resulting surface plasmon resonance is transferred over a distance of up to 20 nm to the outer gold layer where attached proteins can be detected by surfaceenhanced Raman spectroscopy. [source]

An unconditionally stable three level finite difference scheme for solving parabolic two-step micro heat transport equations in a three-dimensional double-layered thin film

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 4 2004
Weizhong Dai
Abstract Heat transport at the microscale is of vital importance in microtechnology applications. The heat transport equations are parabolic two-step equations, which are different from the traditional heat diffusion equation. In this study, we develop a three-level finite difference scheme for solving the micro heat transport equations in a three-dimensional double-layered thin film. It is shown by the discrete energy method that the scheme is unconditionally stable. Numerical results for thermal analysis of a gold layer on a chromium padding layer are obtained. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Nanostructuring of an AlGaInP light emitting diode for surface plasmon enhanced emission of light output

PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 8 2008
R. M. Perks
Abstract This work describes a successful post fabrication method of applying a plasmonic grating to the surface of a mounted AlGaInP LED device. A Carl Zeiss 1540 XB Focused Ion beam system was used to mill holes in a thin gold layer with a periodicity of around 540 nm. Measurements of the total light output of the device compared with a standard un-textured device show that the plasmonic grating was found to significantly affect the light output characteristics such that the overall light output was reduced. This is attributed to the fact that only p-polarised light can interact with the hole array. Furthermore, the onset of saturation in the textured device was not evident as compared with the un-textured device. This is attributed to improved current spreading in the device due to the top gold layer. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Ellipsometry study of ultra thin layers of evaporated gold

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 5 2008
Alexei Nabok
Abstract Optical properties of ultra thin (from 1 to 40 nm) films of gold evaporated on glass and silicon were studied with the method of spectroscopic ellipsometry in both external and internal reflection configurations as well as with the UV-visible absorption spectroscopy. The results obtained showed a gradual shift of the plasmon peak from 580 nm for 1 nm thick films to more than 1000 nm for thick (40 nm) gold films. Such phenomenon can be interpreted in terms of quantum confinement of surface plasmons in gold islands. The threshold of the metal-dielectric transition was found at the film thickness between 4 and 5 nm. Thiolation of the surface of glass has resulted in a slight decrease in the effective thickness of gold layer and respective smaller blue shift of n (,) and k (,) dispersion curves, however no dramatic changes were observed in the film morphology. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Gold-coated fused-silica sheathless electrospray emitters based on vapor-deposited titanium adhesion layers

RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 14 2003
Stefan Nilsson
Gold-coated fused-silica electrospray (ES) emitters based on vapor-deposited adhesion layers of titanium have been manufactured to investigate the possibilities of producing durable ES emitters applicable in chip-based analytical devices. The stabilities of the emitters were studied by both electrospray and electrochemical experiments and a marked increase in the emitter lifetime, compared to that for Cr/Au coated emitters, was found for the Ti/Au emitters in the ES durability tests. This indicates that Ti (rather than Cr) adhesion layers should be used in association with large-scale fabrication of ES emitters by vapor-deposition techniques. The lifetime of about 500,700 hours also allowed the Ti/Au-coated emitter to be used as an integrated part of a capillary liquid chromatography column coupled to a mass spectrometer in a series of LC/MS experiments. The Ti/Au coating was further studied by electrochemical techniques and scanning electron microscopy in conjunction with X-ray spectroscopy. It is shown that the eventual failure of the Ti/Au emitters in ES experiments was due to an almost complete detachment of the gold layer. Experimental evidence suggests that the detachment of the gold coating was due to a reduced adhesion to the titanium layer during oxidation in positive electrospray. Most likely, this was caused by the formation of an oxide layer on the titanium film. It is thus shown that unlimited emitter stabilities are not automatically obtained even if the metallic adhesion layer is stabilized by an oxide formation under positive electrospray conditions. Copyright © 2003 John Wiley & Sons, Ltd. [source]