Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces
Heptamethinecyanine J-aggregates display sharp, intense fluorescence emission making them attractive candidates for developing a variety of chem-bio-sensing applications. They have been immobilized on planar thiol-covered Au surfaces and thiol-capped Au nanoparticles by weak molecular interactions....
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todo:paper_20403364_v4_n2_p531_Menendez2023-10-03T16:37:45Z Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces Menéndez, G.O. Cortés, E. Grumelli, D. Méndez De Leo, L.P. Williams, F.J. Tognalli, N.G. Fainstein, A. Vela, M.E. Jares-Erijman, E.A. Salvarezza, R.C. Au nanoparticle Au surfaces Au(1 1 1 ) Au(111) surfaces Bio-compatible systems Biological applications Electrochemical techniques Fluorescence emission J aggregates Planar surface PM-IRRAS Substrate surface Adsorption Aggregates Chemisorption Monomers Nanoparticles Optical properties Raman spectroscopy Self assembly Gold cyanide gold nanomaterial thiol derivative article chemistry conformation macromolecule materials testing particle size surface property ultrastructure Cyanides Gold Macromolecular Substances Materials Testing Molecular Conformation Nanostructures Particle Size Sulfhydryl Compounds Surface Properties Heptamethinecyanine J-aggregates display sharp, intense fluorescence emission making them attractive candidates for developing a variety of chem-bio-sensing applications. They have been immobilized on planar thiol-covered Au surfaces and thiol-capped Au nanoparticles by weak molecular interactions. In this work the self-assembly of novel thiolated cyanine (CNN) on Au(111) and citrate-capped AuNPs from solutions containing monomers and J-aggregates has been studied by using STM, XPS, PM-IRRAS, electrochemical techniques and Raman spectroscopy. Data show that CNN species adsorb on the Au surfaces by forming thiolate-Au bonds. We found that the J-aggregates are preferentially adsorbed on the Au(111) surface directly from the solution while adsorbed CNN monomers cannot organize into aggregates on the substrate surface. These results indicate that the CNN-Au interaction is not able to disorganize the large J-aggregates stabilized by π-π stacking to optimize the S-Au binding site but it is strong enough to hinder the π-π stacking when CNNs are chemisorbed as monomers. The optical properties of the J-aggregates remain active after adsorption. The possibility of covalently bonding CNN J-aggregates to Au planar surfaces and Au nanoparticles controlling the J-aggregate/Au distance opens a new path regarding their improved stability and the wide range of biological applications of both CNN and AuNP biocompatible systems. © 2012 The Royal Society of Chemistry. Fil:Menéndez, G.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Grumelli, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Méndez De Leo, L.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Williams, F.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Jares-Erijman, E.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_20403364_v4_n2_p531_Menendez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Au nanoparticle Au surfaces Au(1 1 1 ) Au(111) surfaces Bio-compatible systems Biological applications Electrochemical techniques Fluorescence emission J aggregates Planar surface PM-IRRAS Substrate surface Adsorption Aggregates Chemisorption Monomers Nanoparticles Optical properties Raman spectroscopy Self assembly Gold cyanide gold nanomaterial thiol derivative article chemistry conformation macromolecule materials testing particle size surface property ultrastructure Cyanides Gold Macromolecular Substances Materials Testing Molecular Conformation Nanostructures Particle Size Sulfhydryl Compounds Surface Properties |
| spellingShingle |
Au nanoparticle Au surfaces Au(1 1 1 ) Au(111) surfaces Bio-compatible systems Biological applications Electrochemical techniques Fluorescence emission J aggregates Planar surface PM-IRRAS Substrate surface Adsorption Aggregates Chemisorption Monomers Nanoparticles Optical properties Raman spectroscopy Self assembly Gold cyanide gold nanomaterial thiol derivative article chemistry conformation macromolecule materials testing particle size surface property ultrastructure Cyanides Gold Macromolecular Substances Materials Testing Molecular Conformation Nanostructures Particle Size Sulfhydryl Compounds Surface Properties Menéndez, G.O. Cortés, E. Grumelli, D. Méndez De Leo, L.P. Williams, F.J. Tognalli, N.G. Fainstein, A. Vela, M.E. Jares-Erijman, E.A. Salvarezza, R.C. Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces |
| topic_facet |
Au nanoparticle Au surfaces Au(1 1 1 ) Au(111) surfaces Bio-compatible systems Biological applications Electrochemical techniques Fluorescence emission J aggregates Planar surface PM-IRRAS Substrate surface Adsorption Aggregates Chemisorption Monomers Nanoparticles Optical properties Raman spectroscopy Self assembly Gold cyanide gold nanomaterial thiol derivative article chemistry conformation macromolecule materials testing particle size surface property ultrastructure Cyanides Gold Macromolecular Substances Materials Testing Molecular Conformation Nanostructures Particle Size Sulfhydryl Compounds Surface Properties |
| description |
Heptamethinecyanine J-aggregates display sharp, intense fluorescence emission making them attractive candidates for developing a variety of chem-bio-sensing applications. They have been immobilized on planar thiol-covered Au surfaces and thiol-capped Au nanoparticles by weak molecular interactions. In this work the self-assembly of novel thiolated cyanine (CNN) on Au(111) and citrate-capped AuNPs from solutions containing monomers and J-aggregates has been studied by using STM, XPS, PM-IRRAS, electrochemical techniques and Raman spectroscopy. Data show that CNN species adsorb on the Au surfaces by forming thiolate-Au bonds. We found that the J-aggregates are preferentially adsorbed on the Au(111) surface directly from the solution while adsorbed CNN monomers cannot organize into aggregates on the substrate surface. These results indicate that the CNN-Au interaction is not able to disorganize the large J-aggregates stabilized by π-π stacking to optimize the S-Au binding site but it is strong enough to hinder the π-π stacking when CNNs are chemisorbed as monomers. The optical properties of the J-aggregates remain active after adsorption. The possibility of covalently bonding CNN J-aggregates to Au planar surfaces and Au nanoparticles controlling the J-aggregate/Au distance opens a new path regarding their improved stability and the wide range of biological applications of both CNN and AuNP biocompatible systems. © 2012 The Royal Society of Chemistry. |
| format |
JOUR |
| author |
Menéndez, G.O. Cortés, E. Grumelli, D. Méndez De Leo, L.P. Williams, F.J. Tognalli, N.G. Fainstein, A. Vela, M.E. Jares-Erijman, E.A. Salvarezza, R.C. |
| author_facet |
Menéndez, G.O. Cortés, E. Grumelli, D. Méndez De Leo, L.P. Williams, F.J. Tognalli, N.G. Fainstein, A. Vela, M.E. Jares-Erijman, E.A. Salvarezza, R.C. |
| author_sort |
Menéndez, G.O. |
| title |
Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces |
| title_short |
Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces |
| title_full |
Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces |
| title_fullStr |
Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces |
| title_full_unstemmed |
Self-assembly of thiolated cyanine aggregates on Au(111) and Au nanoparticle surfaces |
| title_sort |
self-assembly of thiolated cyanine aggregates on au(111) and au nanoparticle surfaces |
| url |
http://hdl.handle.net/20.500.12110/paper_20403364_v4_n2_p531_Menendez |
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