Composition, nanostructure, and optical properties of silver and silver-copper lusters

Abstract

Influence of alloy inhomogeneities on the determination by Raman scattering of composition and strain in Si1-xGex/Si(001) layers J. Appl. Phys. 112, 023512 (2012) Plasmon coupling in circular-hole dimers: From separation-to touching-coupling regimes J. Appl. Phys. 112, 013113 (2012) Correlation between reflectivity and resistivity in multi-component metallic systems Appl. Phys. Lett. 101, 011902 (2012) Ultrathin metallic coatings can induce quantum levitation between nanosurfaces Appl. Phys. Lett. 100, 253104 (2012) Transmittance and optical constants of Sr films in the 6-1220eV spectral range J. Appl. Phys. 111, 113533 (2012) Additional information on J. Appl. Phys. Lusters are composite thin layers of coinage metal nanoparticles in glass displaying peculiar optical properties and obtained by a process involving ionic exchange, diffusion, and crystallization. In particular, the origin of the high reflectance (golden-shine) shown by those layers has been subject of some discussion. It has been attributed to either the presence of larger particles, thinner multiple layers or higher volume fraction of nanoparticles. The object of this paper is to clarify this for which a set of laboratory designed lusters are analysed by Rutherford backscattering spectroscopy, transmission electron microscopy, x-ray diffraction, and ultraviolet-visible spectroscopy. Model calculations and numerical simulations using the finite difference time domain method were also performed to evaluate the optical properties. Finally, the correlation between synthesis conditions, nanostructure, and optical properties is obtained for these materials. V C 2012 American Institute of Physics. [http://dx

Ceramics from the Alcazar Palace in Seville (Spain) dated between the 11th and 15th centuries: Compositions, technological features and degradation processes

“…These two layers represent a 285-nm-thick layer, characterised by a Sn gradient, on top of the substrate. Analogous observations were made by Pradell et al in a set of laboratory lustres [40]. In the light brown lustre, the uppermost layer includes Ag and Cu nanoparticles.…”

“…For the former, we have studied pastes (bodies) and glazes of 29 buried ceramic fragments dated from the 11th to the 15th century that were found during several archaeological excavations in the Real Alcazar of Seville. Two of the samples contain a lustre decoration that gives a metallic shine to the ceramics; this effect has been studied recently by several groups in ancient ceramics [13,20,[37][38][39][40][41][42][43]. The study was accomplished to deduce the possible origin and technological features of these ceramic materials starting from their chemical composition and establish the chronological and geographical evolution of the characteristics and the production techniques.…”

Technology of production of Syrian lustre (11th to 13th century)

“…The yellow-greenish and red colours obtained are due to the dominant dipolar contribution to the SPR absorbance cross section of silver nanoparticles (≤ 30 nm) and copper nanoparticles (≤ 50 nm), respectively, but also to the relative amount and oxidation state of silver and copper in the layer [7][8][9] . For larger nanoparticles, higher SPR multipolar contributions become more important and are responsible for the splitting and red shift of the silver absorption peak and also for the increase in the scattering contribution 10,11 , changing the colour of silver lustres from yellow-greenish to orange then brown and creating blue-purplish iridescences 7,9,12 .…”

“…Nevertheless, the most distinctive characteristic of lustre is the metallic like shine; golden 9,12 or coppery 13 from silver and copper nanoparticles respectively. Similarly to what happens in photonic materials 14 , the optical response of an ensemble of particles cannot be attributed to the scattering by individual particles but rather from the collective effect 15 which produces intense colours and strong reflectance.…”

A comparative study of Hispano-Moorish and Italian Renaissance lustred majolicas by using X-ray absorption spectroscopy

“…In this way, beautiful iridescent reections of different colours (in particular gold and ruby-red) are obtained. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] The characterisation and the study of lustre decorated majolicas is of considerable interest for archaeologists and scientists, offering possibilities to produce pottery with outstanding decoration following ancient examples, because nowadays artisans are interested in the reproduction of ancient recipes and procedures. The lustre technique, originally developed in Iraq, later spread to Egypt, Persia and Spain, following the expansion of the Arabian culture during medieval time.…”