ASAXS study on the formation of core–shell Ag/Au nanoparticles in glass

Abstract

Nanosized metal particles of various configurations embedded in surface regions of glass have great potential as nonlinear optical materials for photonic devices. We have prepared Ag/Au nanoparticles in core-shell configuration in soda-lime silicate glass by double-ion implantation and investigated their structural characteristics by anomalous small-angle x-ray scattering (ASAXS) and transmission electron microscopy. Measurements at x-ray energies slightly below the Au L(3) edge indicate the formation of bimetallic Ag/Au shells in some of the nanoparticles for high-dose ion implantation. An element-specific analysis of the ASAXS results allowed us not only to validate and quantify the core-shell structure, but simultaneously also the composition of the shells. Hollow nanoparticles were found for an Au-Ag implantation sequence, whereas an Ag-Au sequence generates a diluted core composition. The shift of the maximum position of optical absorption of the samples due to surface plasmon resonance of bimetallic nanoparticles, as monitored by optical spectroscopy, revealed the considerable influence of the respective particle configuration.

Trends in anomalous small-angle X-ray scattering in grazing incidence for supported nanoalloyed and core-shell metallic nanoparticles

“…F part (q, R) and F co (q, R c ) are the form factor for a spherical scattering object of radius R for the whole particle and of a radius R c for the core, respectively. Only a limited number of papers are dedicated to investigations of core-shell particles by SAXS technique [23][24][25], and even less by ASAXS technique [19,26,27]. Figure 3 shows data extracted from recent works of Haug and coworkers [27].…”

“…Only a limited number of papers are dedicated to investigations of core-shell particles by SAXS technique [23][24][25], and even less by ASAXS technique [19,26,27]. Figure 3 shows data extracted from recent works of Haug and coworkers [27]. These authors investigated the chemical composition and the morphology of nanosized bimetallic particles embedded in surface regions of a glass sample, prepared by double-ion implantation of Ag/Au.…”

Investigation of Energy‐Relevant Materials with Synchrotron X‐Rays and Neutrons

“…[126] ASAXS has recently been demonstrated to provide useful information about chemical compositions on the nanometer scale. [127,128] As heterogeneous precious metal catalysts mostly consist of the nm-sized metal particles supported on chemically inert carriers, [129,130] ASAXS is an ideal tool for their characterization. To deduce an applicable structural model of the nanoparticles in the aforementioned system, a RuSe x catalyst with 40 wt% Ru and 14 wt% Se reduction-annealed at 800 8C was characterized in detail by ASAXS.…”

Anomalous Small Angle X-Ray Scattering Simulations: Proof of Concept for Distance Measurements for Nanoparticle-Labelled Biomacromolecules in Solution

“…In addition, the weakness of the scattering signature from the ions relative to the whole molecule meant that only extremely limited information could be extracted about their location [4], [6]. In order to distinguish more information on the distance between specific sites it is desirable to use stronger scatterers and more than one ion type [7]. Metal labelling of biological material, especially using nanoclusters, can now be attained through standard chemistries, and therefore there is now the possibility of attaching multiple labels to a protein or nucleic acid.…”