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.
Highlights
In the past decade a special attention was focused on hybrid materials based on various allotropes of carbon that is considered to be the 21st century material and mono/bi-metal nanoparticles with remarkable plasmonic properties
A promising approach to hybrid NPs’ synthesis can be based on transformation of precursor molecules which can be considered as building blocks for construction of final nanostructures
Under the framework of this approach the photosensitive supramolecular complexes, which consist of central heterometallic cluster core and surrounded by phosphine and alkyl ligands, can be used as prospective precursors
Summary
In the past decade a special attention was focused on hybrid materials based on various allotropes of carbon that is considered to be the 21st century material and mono/bi-metal nanoparticles with remarkable plasmonic properties. Similar processes are typically considered to be undesirable, especially for the complexes with enhanced luminescence characteristics to keep their useful properties under irradiation This is why the present study is of critical importance for understanding of laser irradiation effect onto these supramolecules, routes of energy transfer in the complexes of this sort and nature of transformation processes resulting in nanostructured phase formation. This will make possible a rational design of the hybrid structures with a desired composition, morphology and architecture
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