Abstract
We simulated the extinction spectra of Ag–Au alloyed nanoparticles produced by pulsed laser ablation in liquid of elemental targets followed by re-irradiation of suitable mixtures of the obtained colloidal suspensions. When we make use of the optical constants of Ag–Au alloys, our theoretical approach, developed in the framework of the T-matrix formalism, accurately reproduces the experimental features of the extinction spectra of laser-produced nanoalloys with compositions that span the entire composition range (Ag25Au75, Ag50Au50, and Ag75Au25).
Highlights
Twenty years ago, plasmonics was introduced and defined as the discipline that deals with surface plasmon resonance (SPR)-related science and technology
We synthesized by pulsed laser ablation in liquid (PLAL) elemental colloidal suspensions of Ag and Au NPs, on referred to as e-Ag and e-Au
We prepared physical mixtures of Ag and Au colloids taking selected volume fractions from the elemental colloids and mixing them. Both elemental colloids and physical mixtures were exposed to reirradiation with the same laser irradiation parameters as for the synthesis
Summary
Plasmonics was introduced and defined as the discipline that deals with surface plasmon resonance (SPR)-related science and technology. Plasmonics showed to be useful for quite different applications, such as, e.g., optical sensing[1] and phototherapy.[2] This is concomitant with the widespread choice of Ag and Au as the metals used to engineer a variety of progressively more elaborated surface nanostructures with SPR in the visible− near-IR region. Without any claim of completeness, among the lines of attack of the problem, we mention the efforts to synthesize Au nanorods by controlled chemical procedures (e.g., use of surfactants and proper seed growth approaches3), and the various approaches to produce periodic arrays of plasmonic nanostructures for chemical sensing applications.[4,5] Other strategies start with the controlled production of nonplasmonic nanostructures (e.g., silicon nanowires6) to subsequently decorate them with noble metals that impart the desired plasmonic properties.[7] we mention laserbased methods by which one can deposit on an inert support arrays of mutually assembled nanoparticles (NPs) previously synthesized in an expanding plasma plume.[8,9] Alternatively, by pulsed laser ablation in liquid (PLAL), one may directly obtain colloidal suspensions of noble metals[10,11] that can be sprayed on the support, forming a carpet of NPs.[12]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
