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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

PL intensity and photo of solutions irradiated with He-Cd laser beam.
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f2: PL intensity and photo of solutions irradiated with He-Cd laser beam.

Mentions: Laser irradiation of 1 in dichloroethane solution results in intense luminescence (in spectral region 500–700 nm with the maximum at 570 nm), which was found to decrease with irradiation time (Fig. 2). The photoluminescence (PL) intensity was measured for initial solution and solutions irradiated for 5, 10, 15, and 20 min. Along with luminescence fading the solution darkening and opacification (inset Fig. 2) and eventually suspension formation were observed. It should be noted that 60 min irradiation results in complete disappearance of luminescence. The observed effect is evidently indicative of two possible relaxation channels of the complex excited states: “optical channel” – radiative decay to give 570 nm luminescence emission and “transformation channel” – multiphonon relaxation accompanied by transformation/ decomposition of the molecule resulting in a sediment formation.


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)

PL intensity and photo of solutions irradiated with He-Cd laser beam.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: PL intensity and photo of solutions irradiated with He-Cd laser beam.
Mentions: Laser irradiation of 1 in dichloroethane solution results in intense luminescence (in spectral region 500–700 nm with the maximum at 570 nm), which was found to decrease with irradiation time (Fig. 2). The photoluminescence (PL) intensity was measured for initial solution and solutions irradiated for 5, 10, 15, and 20 min. Along with luminescence fading the solution darkening and opacification (inset Fig. 2) and eventually suspension formation were observed. It should be noted that 60 min irradiation results in complete disappearance of luminescence. The observed effect is evidently indicative of two possible relaxation channels of the complex excited states: “optical channel” – radiative decay to give 570 nm luminescence emission and “transformation channel” – multiphonon relaxation accompanied by transformation/ decomposition of the molecule resulting in a sediment formation.

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