Optical and structural characterization of silver islands films on glass substrates (original) (raw)
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Optical and Structural Characterization of Silver Island Films on Glass Substrates
2008
Metal island films (MIFs) of Ag on glass substrates were fabricated by the e-beam evaporation technique. The dependence of the surface plasmon (SP) absorption properties on the deposition mass thickness and substrate temperature was quantified. The structural and optical characterization of the MIFs, obtained using spectrometry, grazing-incidence small-angle X-ray scattering (GISAXS) and atomic force microscopy (AFM) evidences the evolution of SP characteristics depending on the fabrication parameters: the red shift of the absorption peaks with the increase of deposition thickness accompanied by peak widening and the blue-shift of peaks with the increase of deposition temperature followed by the peak narrowing. These findings were explained by the differences in the concentration, shape and size of the obtained silver islands.
Optical and structural properties of Au-Ag islands films for plasmonic applications
Applied Physics A-materials Science & Processing, 2011
Bimetallic islands films consisting of composite Au-Ag nanoparticles are deposited on glass substrates by electron beam evaporation. Broad tuning of the surface-plasmon resonance (SPR) characteristics can be achieved by controlling film composition, deposition temperature and post-deposition thermal annealing. Optical and structural characterization of the samples enable one to establish the link between the SPR and the morphological and compositional characteristics of nanoparticles.
Optical and structural characterization of gold island films on glass substrates
Thin Solid Films, 2015
The films consisting of gold nanoparticles, prepared by electron beam evaporation on glass substrates, exhibit interesting optical properties due to localized surface plasmon resonance. The tailoring of optical properties has been achieved by varying deposition mass thickness and substrate temperature. The relation between optical and structural properties has been studied. Optical characterization of samples has been carried out by variable angle spectroscopic ellipsometry and for structural characterization grazing incidence small angle X-ray scattering and atomic force microscopy have been used. Results show how the structural properties, obtained by using specific fabrication parameters, influence the resulting optical characteristics. The differences in concentration, shape and size of the produced gold nanoparticles result in a spectral shift of localized surface plasmon resonance, and a change of its width and intensity. The appearance of percolation is signed by Drude-like infrared absorption.
Journal of Raman Spectroscopy, 1998
Silver island Ðlms prepared by pulsed laser deposition were tested as substrates for surface enhanced raman spectroscopy. They exhibit a position-dependent thickness and SERS activity distribution. Cresyl Violet and Crystal Violet were chosen as test molecules. The annealing of the Ðlms leads to coalescence of the initial island structures and the development of longer ellipsoidal particles, which generally improves the enhancement properties of the substrates. The dimensions of the surface structures depend on the local initial Ðlm thickness. The changes in the island shape and dimensions manifest themselves in changes in the absorption spectra.
Thin Solid Films, 2010
We report the attainment of surface plasmon-coupled emission (SPCE) from highly uniform thin silver films, solution-deposited on glass substrates by a wet chemistry approach. The surface morphology of these films was characterized by atomic force microscopy. The SPCE emission enhancements, polarization and angularity obtained from solution-deposited silver on BK7 glass were comparable to that achieved from conventional SPCE slides prepared via vapor deposition. This facile, wet chemistry procedure for the deposition of SPCE films provides an inexpensive, low maintenance alternative to vapor deposition for SPCE substrate preparation. This would allow the fluorescence observation technique to become more readily available for high sensitivity, low cost applications.
American Journal of Physics, 2000
We present a demonstration of the surface plasmon phenomenon as it occurs in thin metal island films. The metal films are deposited on glass microscope slides. The effect of the surface plasmon resonance may be observed visually on the slide without further apparatus. Heating the film changes the shape of the islands and therefore the resonant frequency of the surface plasmon and changes the color of the film. Placing the film in a dielectric medium changes the resonance condition for the surface plasmon again and changes the color again. We show this by coating the slides with commercially available liquids with different indices of refraction. We present a theoretical model that assumes the islands are oblate spheroids. There are enough details given so that the equations can be programed and the theoretical optical absorbance can be reproduced. We also present a modification to the theory so that the shift in resonant frequency can be calculated when the spheroids are immersed in the index fluids. We describe our apparatus for making thin films and our optical spectrometer system. We then present optical absorbance measurements of thin films of both Ag and Au in air and in two liquids with different indices of refraction.
Morphology and optical properties of island metal films on semiconductor surface
Scripta Materialia, 2001
Technology of local electrochemical deposition of island metal films (Au) on semiconductor surface (GaAs) is elaborated. As observed in TEM and AFM, gold islets have the form of a truncated spheres separated by uncovered areas of GaAs. By comparison results of optical measurements on the samples with islets of essentially various sizes, the attempt of reveal the size effect in optical properties of gold clusters is undertaken.
Vacuum deposition of silver island films on chemically modified surfaces
Journal of vacuum science & technology, 2003
The silver island films were vacuum deposited at two different evaporation rates on unmodified indium tin oxide substrates and the substrates modified with molecules containing thiol, pyridyl, and fluorocarbon groups. The films were characterized by UV-visible spectroscopy and scanning electron microscopy. Large variations in the structure and thickness of the island films that were observed between substrates were rationalized in terms of different chemical affinity of the surfaces to the silver metal.
Structural and morphological characterization of chemically deposited silver films
2006
Silver thin films were deposited on glass slide substrates at room temperature by the chemical bath deposition (CBD) technique, using silver nitrate (AgNO 3) as Ag C1 source and triethanolamine [(N(CH 2 CH 2 OH) 3)] as the complex reductor agent. We determined the conditions of the CBD process to obtain homogeneous, opaque silver films with good adhesion to the substrate and white coloration. The silver films were studied by X-ray diffraction, scanning electron microscopy, and atomic force microscopy. The results show that the films are composed of several layers with different morphology depending on the deposition time. In all the cases, the crystalline structure of the films was the face cubic centered phase with a moderate [111] texture. Strains and stresses were calculated by the Vook-Witt grain interaction model.
Chemical Physics Letters, 2009
In this study we have analyzed metal-enhanced fluorescence (MEF) effects from different density silver island films (SiFs) and the effects of sample geometry on the observed enhancement of fluorescence (EF). It is shown that silver islands grow exponentially with SiF deposition time (DT<7min), optical density of SiFs almost linearly depends on DT; electrical conductivity is zero. At DT>7 min, silver islands merge, exhibiting a sharp increase in electrical conductivity. It has been shown that the newly proposed SiF-Glass sample geometry exhibits higher EF values than the commonly used in MEF studies SiF-SiF sample geometry. The SiF-Glass geometry demonstrates high sensitivity for surface immunoassays, a growing application of metal-enhanced fluorescence.