title: Laser-induced transformation of supramolecular complexes: approach to controlled formation of hybrid multi-yolk-shell Au-Ag@a-C:H nanostructures.
abstract: In the present work an efficient approach of the controlled formation of hybrid Au-Ag-C nanostructures based on laser-induced transformation of organometallic supramolecular cluster compound is suggested. Herein the one-step process of the laser-induced synthesis of hybrid multi-yolk-shell Au-Ag@a-C:H nanoparticles which are bimetallic gold-silver subnanoclusters dispersed in nanospheres of amorphous hydrogenated a-C:H carbon is reported in details. It has been demonstrated that variation of the experimental parameters such as type of the organometallic precursor, solvent, deposition geometry and duration of laser irradiation allows directed control of nanoparticles' dimension and morphology. The mechanism of Au-Ag@a-C:H nanoparticles formation is suggested: the photo-excitation of the precursor molecule through metal-to-ligand charge transfer followed by rupture of metallophilic bonds, transformation of the cluster core including red-ox intramolecular reaction and aggregation of heterometallic species that results in the hybrid metal/carbon nanoparticles with multi-yolk-shell architecture formation. It has been found that the nanoparticles obtained can be efficiently used for the Surface-Enhanced Raman Spectroscopy label-free detection of human serum albumin in low concentration solution.
authors.affiliation: Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia.
authors.forename: A A
authors.initials: AA
authors.lastname: Manshina
authors.affiliation: Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia.
authors.forename: E V
authors.initials: EV
authors.lastname: Grachova
authors.affiliation: Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Povolotskiy
authors.affiliation: Center for optical and laser materials research, Research park, St. Petersburg State University, Ulianovskaya St. 5, St. Petersburg, 198504, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Povolotckaia
authors.affiliation: Interdisciplinary Resource Center for Nanotechnology, St. Petersburg State University, Ulianovskaya St. 1, St. Petersburg, 198504, Russia.
authors.forename: Y V
authors.initials: YV
authors.lastname: Petrov
authors.affiliation: University of Eastern Finland, Joensuu, 80101, Finland.
authors.forename: I O
authors.initials: IO
authors.lastname: Koshevoy
authors.affiliation: Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: A A
authors.initials: AA
authors.lastname: Makarova
authors.affiliation: Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: D V
authors.initials: DV
authors.lastname: Vyalikh
authors.affiliation: Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia.
authors.forename: S P
authors.initials: SP
authors.lastname: Tunik
mesh_terms: D002244:Carbon / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D006801:Humans; D006859:Hydrogen / Q000737:chemistry; D007834:Lasers; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D056951:Photoelectron Spectroscopy; D012709:Serum Albumin / Q000032:analysis; D012834:Silver / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D012709:Serum Albumin; D012834:Silver; D002244:Carbon; D006046:Gold; D006859:Hydrogen