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Laser-induced transformation of supramolecular complexes: approach to controlled formation of hybrid multi-yolk-shell Au-Ag@a-C:H nanostructures.

Manshina AA, Grachova EV, Povolotskiy AV, Povolotckaia AV, Petrov YV, Koshevoy IO, Makarova AA, Vyalikh DV, Tunik SP - Sci Rep (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia.

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.

No MeSH data available.


Related in: MedlinePlus

SEM images of NPs obtained from (a) acetone, (b) acetophenone, (c) dichloroethane solutions of 1. (d–f) Size distribution of the NPs.
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f3: SEM images of NPs obtained from (a) acetone, (b) acetophenone, (c) dichloroethane solutions of 1. (d–f) Size distribution of the NPs.

Mentions: Prolonged laser beam irradiation of 1 solution allows for formation of the nanoparticles with morphology and size which depend on physicochemical properties of solvent. SEM images of the NPs formed in different solvents (acetophenone, dichloroethane and acetone) and separated from solutions by centrifugation are shown in Fig. 3a–c. The density of solvents used increases in the acetone, acetophenone, dichloroethane sequence (0.79, 1.03, 1.26 g/cm3, respectively) and the size of NPs follow the same order that reflects a certain effect of the solvent property. Figure 3d–f presents size distribution of the particles, which was estimated by measuring the particles diameters in the micro-photos. It is clear that the nature of the solvent affects strongly both, the NPs morphology and size. The particles formed in acetone are densely packed and their average dimension is about 20 nm. In acetophenone solution the NPs form a porous structure with the average particle size of 30 nm, whereas large particles with the average dimension ca. 135 nm and rather wide particle-size distribution were found to be formed in dichloroethane solution.


Laser-induced transformation of supramolecular complexes: approach to controlled formation of hybrid multi-yolk-shell Au-Ag@a-C:H nanostructures.

Manshina AA, Grachova EV, Povolotskiy AV, Povolotckaia AV, Petrov YV, Koshevoy IO, Makarova AA, Vyalikh DV, Tunik SP - Sci Rep (2015)

SEM images of NPs obtained from (a) acetone, (b) acetophenone, (c) dichloroethane solutions of 1. (d–f) Size distribution of the NPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4495562&req=5

f3: SEM images of NPs obtained from (a) acetone, (b) acetophenone, (c) dichloroethane solutions of 1. (d–f) Size distribution of the NPs.
Mentions: Prolonged laser beam irradiation of 1 solution allows for formation of the nanoparticles with morphology and size which depend on physicochemical properties of solvent. SEM images of the NPs formed in different solvents (acetophenone, dichloroethane and acetone) and separated from solutions by centrifugation are shown in Fig. 3a–c. The density of solvents used increases in the acetone, acetophenone, dichloroethane sequence (0.79, 1.03, 1.26 g/cm3, respectively) and the size of NPs follow the same order that reflects a certain effect of the solvent property. Figure 3d–f presents size distribution of the particles, which was estimated by measuring the particles diameters in the micro-photos. It is clear that the nature of the solvent affects strongly both, the NPs morphology and size. The particles formed in acetone are densely packed and their average dimension is about 20 nm. In acetophenone solution the NPs form a porous structure with the average particle size of 30 nm, whereas large particles with the average dimension ca. 135 nm and rather wide particle-size distribution were found to be formed in dichloroethane solution.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia.

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.

No MeSH data available.


Related in: MedlinePlus