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González MCR, Orive AG, Salvarezza RC, Creus AH. Electrodeposition of gold nanoparticles on aryl diazonium monolayer functionalized HOPG surfaces. Phys Chem Chem Phys 2015; 18:1953-60. [PMID: 26685776 DOI: 10.1039/c5cp06415e] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gold nanoparticle electrodeposition on a modified HOPG surface with a monolayer organic film based on aryl diazonium chemistry has been studied. This organic monolayer is electrochemically grown with the use of 2,2-diphenyl-1-picrylhydrazyl (DPPH), a radical scavenger. The electrodeposition of gold on this modified surface is highly favored resulting in an AuNP surface density comparable to that found on glassy carbon. AuNPs grow only in the areas covered by the organic monolayer leaving free clean HOPG zones. A progressive mechanism for the nucleation and growth is followed giving hemispherical AuNPs, homogeneously distributed on the surface and their sizes can be well controlled by the applied electrodeposition potential. By using AFM, C-AFM and electrochemical measurements with the aid of two redox probes, namely Fe(CN)6(4-)/Fe(CN)6(3-) and dopamine, relevant results about the electrochemical modified surface as well as the gold nanoparticles electrodeposited on them are obtained.
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Affiliation(s)
- M C R González
- Área de Química Física, Departamento de Química, Facultad de Ciencias, Universidad de La Laguna, Instituto de Materiales y Nanotecnología, Avda. Francisco Sánchez s/n, 38071-La Laguna, Tenerife, Spain.
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2
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Arnal L, Longo G, Stupar P, Castez MF, Cattelan N, Salvarezza RC, Yantorno OM, Kasas S, Vela ME. Localization of adhesins on the surface of a pathogenic bacterial envelope through atomic force microscopy. Nanoscale 2015; 7:17563-17572. [PMID: 26446736 DOI: 10.1039/c5nr04644k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Bacterial adhesion is the first and a significant step in establishing infection. This adhesion normally occurs in the presence of flow of fluids. Therefore, bacterial adhesins must be able to provide high strength interactions with their target surface in order to maintain the adhered bacteria under hydromechanical stressing conditions. In the case of B. pertussis, a Gram-negative bacterium responsible for pertussis, a highly contagious human respiratory tract infection, an important protein participating in the adhesion process is a 220 kDa adhesin named filamentous haemagglutinin (FHA), an outer membrane and also secreted protein that contains recognition domains to adhere to ciliated respiratory epithelial cells and macrophages. In this work, we obtained information on the cell-surface localization and distribution of the B. pertussis adhesin FHA using an antibody-functionalized AFM tip. Through the analysis of specific molecular recognition events we built a map of the spatial distribution of the adhesin which revealed a non-homogeneous pattern. Moreover, our experiments showed a force induced reorganization of the adhesin on the surface of the cells, which could explain a reinforced adhesive response under external forces. This single-molecule information contributes to the understanding of basic molecular mechanisms used by bacterial pathogens to cause infectious disease and to gain insights into the structural features by which adhesins can act as force sensors under mechanical shear conditions.
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Affiliation(s)
- L Arnal
- Centro de Investigación y Desarrollo de Fermentaciones Industriales (CINDEFI-CONICET-CCT La Plata), Facultad de Ciencias Exactas, UNLP. 50 No 227, 1900 La Plata, Argentina
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3
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Quiroga Argañaraz MP, Ramallo-López JM, Benítez G, Rubert A, Prieto ED, Gassa LM, Salvarezza RC, Vela ME. Optimization of the surface properties of nanostructured Ni–W alloys on steel by a mixed silane layer. Phys Chem Chem Phys 2015; 17:14201-7. [DOI: 10.1039/c5cp01895a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Optimization of the surface properties of nanostructured Ni–W coatings on steel by a mixed silane layer.
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Affiliation(s)
- M. P. Quiroga Argañaraz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - J. M. Ramallo-López
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - G. Benítez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - A. Rubert
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - E. D. Prieto
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - L. M. Gassa
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
| | - M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata – CONICET – Sucursal 4 Casilla de Correo 16
- (1900) La Plata
- Argentina
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Carro P, Torrelles X, Salvarezza RC. A novel model for the (√3 × √3)R30° alkanethiolate–Au(111) phase based on alkanethiolate–Au adatom complexes. Phys Chem Chem Phys 2014; 16:19017-23. [DOI: 10.1039/c4cp01255k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Vericat C, Vela ME, Corthey G, Pensa E, Cortés E, Fonticelli MH, Ibañez F, Benitez GE, Carro P, Salvarezza RC. Self-assembled monolayers of thiolates on metals: a review article on sulfur-metal chemistry and surface structures. RSC Adv 2014. [DOI: 10.1039/c4ra04659e] [Citation(s) in RCA: 149] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
A review article on fundamental aspects of thiolate self-assembled monolayers (SAMs) on the (111) and (100) surfaces of the Cu and Ni groups is presented.
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Affiliation(s)
- C. Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - G. Corthey
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - E. Pensa
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - E. Cortés
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - M. H. Fonticelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - F. Ibañez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - G. E. Benitez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
| | - P. Carro
- Departamento de Química
- Area Química Física. Instituto de Materiales y Nanotecnología
- Universidad de La Laguna
- , Spain
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- Universidad Nacional de La Plata-CONICET
- La Plata, Argentina
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Quiroga Argañaraz MP, Ribotta SB, Folquer ME, Benítez G, Rubert A, Gassa LM, Vela ME, Salvarezza RC. The electrochemistry of nanostructured Ni–W alloys. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1965-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Carro P, Torres D, Diaz R, Salvarezza RC, Illas F. Mechanisms of Defect Generation and Clustering in CH3S Self-Assembled Monolayers on Au(111). J Phys Chem Lett 2012; 3:2159-2163. [PMID: 26295764 DOI: 10.1021/jz300712g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Periodic density functional calculations probe that step edges play a key role as source of defects during self-assembly. It is shown that the self-assembly process strongly reduces the energy required to strip an atom from the gold surface, locally increasing the concentration of surface defects. The thermodynamic driving force for the atom stripping is considerably more favorable along step-edge lines within the self-assembly than on the higher-coordinated terrace sites. Furthermore, the clustering of surface defects is considered, and we probe that the formation of aggregates of vacancies in the form of vacancy pits significantly stabilizes the self-assembly on the terraces of gold, where the role of the step edges is expected to be less significant. The high stability of pit-like structures arises from a balance between the corrugation and the enhanced bonding of defect-rich substrates. Our results demonstrate the important role that step edges play during assembly and could be very valuable for discovering defect-free assembled structures.
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Affiliation(s)
- P Carro
- †Departamento de Química Física, Instituto de Materiales y Nanotecnología, Universidad de La Laguna, Tenerife, Spain
| | | | - R Diaz
- §Unidad de Procesos Electroquímicos, Instituto IMDEA Energía, Avda. Ramón de la Sagra, 3, Móstoles (Madrid), Spain
| | - R C Salvarezza
- ∥Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET- Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina
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Arnal L, Serra DO, Cattelan N, Castez MF, Vázquez L, Salvarezza RC, Yantorno OM, Vela ME. Adhesin contribution to nanomechanical properties of the virulent Bordetella pertussis envelope. Langmuir 2012; 28:7461-7469. [PMID: 22515332 DOI: 10.1021/la300811m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Adherence to a biological surface allows bacteria to colonize and persist within the host and represents an essential first step in the pathogenesis of most bacterial diseases. Consequently, the physicochemical properties of the outer membrane in bacteria play a key role for attachment to surfaces and therefore for biofilm formation. Bordetella pertussis is a Gram-negative bacterium that colonizes the respiratory tract of humans, producing whooping cough or pertussis, a highly infectious disease. B. pertussis uses various adhesins exposed on its surface to promote cell-surface and cell-cell interactions. The most dominant adhesin function is displayed by filamentous hemagglutinin (FHA). B. pertussis Tohama I wild-type (Vir+) strain and two defective mutants, an avirulent (Vir-) and a FHA-deficient (FHA-) B. pertussis strains were studied by AFM under physiological conditions to evaluate how the presence or absence of adhesins affects the mechanical properties of the B. pertussis cell surface. Quantitative information on the nanomechanical properties of the bacterial envelope was obtained by AFM force-volume analysis. These studies suggested that the presence of virulence factors is correlated with an increase in the average membrane rigidity, which is largely influenced by the presence of FHA. Moreover, for this system we built a nanoscale stiffness map that reveals an inhomogeneous spatial distribution of Young modulus as well as the presence of rigid nanodomains on the cell surface.
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Affiliation(s)
- L Arnal
- Facultad de Ciencias Exactas, Centro de Investigación y Desarrollo de Fermentaciones Industriales (CINDEFI-CONICET-CCT La Plata), UNLP. 50 No. 227, 1900 La Plata, Argentina
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Ramírez EA, Cortés E, Rubert AA, Carro P, Benítez G, Vela ME, Salvarezza RC. Complex surface chemistry of 4-mercaptopyridine self-assembled monolayers on Au(111). Langmuir 2012; 28:6839-6847. [PMID: 22497438 DOI: 10.1021/la204951u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The adsorption of 4-mercaptopyridine on Au(111) from aqueous or ethanolic solutions is studied by different surface characterization techniques and density functional theory calculations (DFT) including van der Waals interactions. X-ray photoelectron spectroscopy and electrochemical data indicate that self-assembly from 4-mercaptopyridine-containing aqueous 0.1 M NaOH solutions for short immersion times (few minutes) results in a 4-mercaptopyridine (PyS) self-assembled monolayer (SAM) with surface coverage 0.2. Scanning tunneling microscopy images show an island-covered Au surface. The increase in the immersion time from minutes to hours results in a complete SAM degradation yielding adsorbed sulfur and a heavily pitted Au surface. Adsorbed sulfur is also the main product when the self-assembly process is made in ethanolic solutions irrespective of the immersion time. We demonstrate for the first time that a surface reaction is involved in PyS SAM decomposition in ethanol, a surface process not favored in water. DFT calculations suggest that the surface reaction takes place via disulfide formation driven by the higher stability of the S-Au(111) system. Other reactions that contribute to sulfidization are also detected and discussed.
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Affiliation(s)
- E A Ramírez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata-CONICET, La Plata, Argentina
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González Orive A, Grumelli D, Vericat C, Ramallo-López JM, Giovanetti L, Benitez G, Azcárate JC, Corthey G, Fonticelli MH, Requejo FG, Hernández Creus A, Salvarezza RC. "Naked" gold nanoparticles supported on HOPG: melanin functionalization and catalytic activity. Nanoscale 2011; 3:1708-1716. [PMID: 21321759 DOI: 10.1039/c0nr00911c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Reductive electrodesorption has been used to produce "naked" gold nanoparticles (AuNPs) 3 nm in size on HOPG from different thiolate-capped AuNPs. The clean AuNPs transform the electrocatalytic inert HOPG into an active surface for hydrogen peroxide electroreduction, causing a lowering of the cathodic overpotential of 0.25 V with respect to the Au(111) surface. Compared to the plain gold substrates, the nanostructures promote only a slight increase in the hydrogen evolution reaction. In a second modification step a ∼1 nm thick melanin-iron coating is electrochemically formed around the AuNPs. This ultrathin melanin-iron coating largely improves the catalytic activity of the bare AuNPs for both hydrogen peroxide electroreduction and hydrogen evolution reaction. This strategy, which integrates electrochemistry and nanotechnology, can be applied to the preparation of efficient "naked" AuNPs and organic-iron capped AuNPs catalysts.
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Affiliation(s)
- A González Orive
- Departamento de Química Física, Universidad de La Laguna, Avda. Astrofísico Francisco Sanchez S/N, La Laguna, 38071, Tenerife, Spain
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11
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Pensa E, Carro P, Rubert AA, Benítez G, Vericat C, Salvarezza RC. Thiol with an unusual adsorption-desorption behavior: 6-mercaptopurine on Au(111). Langmuir 2010; 26:17068-17074. [PMID: 20949962 DOI: 10.1021/la102441b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A multitechnique study of 6-mercaptopurine (6MP) adsorption on Au(111) is presented. The molecule adsorbs on Au(111), originating short-range ordered domains and irregular nanosized aggregates with a total surface coverage by chemisorbed species smaller than those found for alkanethiol SAMs, as derived from scanning tunneling microscopy (STM) and electrochemical results. X-ray photoelectron spectroscopy (XPS) results show the presence of a thiolate bond, whereas density functional theory (DFT) data indicate strong chemisorption via a S-Au bond and additional binding to the surface via a N-Au bond. From DFT data, the positive charge on the Au topmost surface atoms is markedly smaller than that found for Au atoms in alkanethiolate SAMs. The adsorption of 6MP originates Au atom removal from step edges but no vacancy island formation at (111) terraces. The small coverage of Au islands after 6MP desorption strongly suggests the presence of only a small population of Au adatom-thiolate complexes. We propose that the absence of the Au-S interface reconstruction results from the lack of significant repulsive forces acting at the Au surface atoms.
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Affiliation(s)
- E Pensa
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina
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Carro P, Hernandez Creus A, Muñoz A, Salvarezza RC. On the thermodynamic stability of alpha,omega-alkanedithiols self-assembled monolayers on unreconstructed and reconstructed Au(111). Langmuir 2010; 26:9589-9595. [PMID: 20397655 DOI: 10.1021/la100167b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A comparative study on the thermodynamic stability of the lying down (LD) and standing up (SU) phases of alpha,omega-butanedithiol (BDT) on unreconstructed (U) and on reconstructed (R) Au(111) surfaces is presented. The R surface is made of dithiol-Au adatom units. Density functional calculations (DFT) allow the estimation of the adsorption energy of the LD and SU BDT phases on both substrates. Surface free energies based on the DFT calculations show the coverage of the clean Au(111) surface by the LD phase, and the LD to SU phase transition as the chemical potential of the BDT molecule is increased. The LD and SU phases are more stable on R than on U substrates, suggesting that the Au(111) surface should reconstruct upon BDT adsorption. The stability analysis is extended to longer alpha,omega-dithiols. Results reveal that the LD to SU phase transition is favored as the hydrocarbon chain length of the dithiol molecule is increased. Changes in the hydrogen pressure affect the formation of the LD phase, while they have only minor effects on the LD to SU phase transitions. Our calculations explain the influence of the number of carbon atoms in the hydrocarbon chains, hydrogen pressure and dithiol pressure (or concentration) on dithiol adsorption, and phase transitions. This information is relevant to control the coverage, reactivity, and surface chemistry of the alpha,omega-dithiol self-assembled monolayers on Au surfaces.
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Affiliation(s)
- P Carro
- Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain.
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Vericat C, Vela ME, Benitez G, Carro P, Salvarezza RC. Self-assembled monolayers of thiols and dithiols on gold: new challenges for a well-known system. Chem Soc Rev 2010; 39:1805-34. [PMID: 20419220 DOI: 10.1039/b907301a] [Citation(s) in RCA: 767] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembled monolayers (SAMs) of alkanethiols and dialkanethiols on gold are key elements for building many systems and devices with applications in the wide field of nanotechnology. Despite the progress made in the knowledge of these fascinating two-dimensional molecular systems, there are still several "hot topics" that deserve special attention in order to understand and to control their physical and chemistry properties at the molecular level. This critical review focuses on some of these topics, including the nature of the molecule-gold interface, whose chemistry and structure remain elusive, the self-assembly process on planar and irregular surfaces, and on nanometre-sized objects, and the chemical reactivity and thermal stability of these systems in ambient and aqueous solutions, an issue which seriously limits their technological applications (375 references).
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Affiliation(s)
- C Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricasy Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina
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Díaz C, Schilardi PL, Salvarezza RC, de Mele MFL. Nano/microscale order affects the early stages of biofilm formation on metal surfaces. Langmuir 2007; 23:11206-10. [PMID: 17880247 DOI: 10.1021/la700650q] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The adhesion of Pseudomonas fluorescens was studied on nano/microengineered surfaces. Results show that these bacteria formed well-defined aggregates on randomly oriented nanosized granular gold substrates. These aggregates consist of aligned ensembles of bacteria, with some of them strongly elongated. This kind of biological structure was not found on ordered engineered surfaces because bacterial alignment and cell-to-cell sticking were hindered. Importantly, differences in cell morphology, length, orientation, and flagellation were observed between bacteria attached on the ordered nano/microstructures and the randomly ordered surfaces. The implications of the results are related to the design of engineered surfaces to enhance (nanostructured filters) or inhibit (medical implants and industrial biofouling) bacterial colonization on the surfaces and to the biocontrol of soil ecosystems.
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Affiliation(s)
- C Díaz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata-CONICET, Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina
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Vericat C, Benitez GA, Vela ME, Salvarezza RC, Tognalli NG, Fainstein A. Restricted surface mobility of thiolate-covered metal surfaces: a simple strategy to produce high-area functionalized surfaces. Langmuir 2007; 23:1152-9. [PMID: 17241026 DOI: 10.1021/la062006t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We have studied the self-assembly of thiol monolayers on high-area nanostructured gold surfaces. These surfaces are highly irregular with a fractal dimension close to 2.5. Auger electron spectroscopy and voltammetric data indicate that thiol self-assembly with a maximum surface coverage approximately 1/3 takes place, the same result as that found for smooth gold surfaces. Therefore, neither curvature effects, which would promote higher coverage, nor excluded volume effects, which would result in lower coverage, are present in these irregular surfaces. The high surface area of the bare electrodes exhibits a rapid surface decay in different liquid media that is hindered by alkanethiolate chemisorption. The presence of thiolate SAMs reduces markedly the mass transport surface diffusion of gold adatoms, hindering surface area decay and freezing the system in a metastable state for days. This effect cannot be explained by considering only hydrocarbon-hydrocarbon chain interactions, because it is also observed for ordered arrays of adsorbed S atoms. Therefore, interactions between ordered chemisorbed species at high coverage seem to be responsible for the observed behavior. The thiol-covered high-area metallic substrates can be used to efficiently anchor a large number of molecules, biomolecules, or nanostructures, improving the performance of SAM-based optical and electrochemical devices.
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Affiliation(s)
- C Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata-CONICET, Sucursal 4 Casilla de Correo 16, (1900) La Plata, Argentina
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Torres D, Carro P, Salvarezza RC, Illas F. Evidence for the formation of different energetically similar atomic structures in Ag(111)-(square root[7] x square root[7])-R19.1 degrees-CH3S. Phys Rev Lett 2006; 97:226103. [PMID: 17155817 DOI: 10.1103/physrevlett.97.226103] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2006] [Indexed: 05/12/2023]
Abstract
The atomic structure and thermodynamic stability of Ag(111)(sqrt[7]xsqrt[7])-R19.1 degrees -CH3S has been studied by means of density functional calculations and atomistic first principles thermodynamics. The unreconstructed model and two recently proposed reconstructions have been considered. It is found that, in spite of significant differences in the atomic structure, the different surface models have a very similar surface free energy. It is claimed that the different ordered phases can coexist and that the appearance of one or another depends on the external preparation conditions.
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Affiliation(s)
- D Torres
- Departament de Química Física and CeRQT, Universitat de Barcelona and Parc Científic de Barcelona, E-08028 Barcelona, Spain
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Dos Santos Claro PC, Fonticelli M, Benítez G, Azzaroni O, Schilardi PL, Luque NB, Leiva E, Salvarezza RC. Silver electrodeposition on nanostructured gold: from nanodots to nanoripples. Nanotechnology 2006; 17:3428-3435. [PMID: 19661586 DOI: 10.1088/0957-4484/17/14/014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Silver nanodots and nanoripples have been grown on nanocavity-patterned polycrystalline Au templates by controlled electrodeposition. The initial step is the growth of a first continuous Ag monolayer followed by preferential deposition at nanocavities. The Ag-coated nanocavities act as preferred sites for instantaneous nucleation and growth of the three-dimensional metallic centres. By controlling the amount of deposited Ag, dots of approximately 50 nm average size and approximately 4 nm average height can be grown with spatial and size distributions dictated by the template. The dots are in a metastable state. Further Ag deposition drives the dot surface structure to nanoripple formation. Results show that electrodeposition on nanopatterned electrodes can be used to prepare a high density of nanostructures with a narrow size distribution and spatial order.
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Affiliation(s)
- P C Dos Santos Claro
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata-CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina
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18
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Abstract
The evolution of the surface roughness during the anodic dissolution of polycrystalline Ni was investigated by means of ex situ AFM in acid phosphate solutions. To characterize the time and spatial scaling behavior of surface roughness, the interface width and the power spectral density of the surface at different dissolution stages were analyzed in terms of dynamic scaling theories. The time dependence of global surface roughness, W(L,t), shows an unstable behavior characterized by a continuous increase without saturation following the relation W approximately t(beta), where beta > 0.5. The unstable behavior results from the development of wide grooves that originates a surface consisting of mounds. Two scaling regimes at scales shorter and larger than the mound dimensions (l(c)) were observed. For l < l(c), we found alpha approximately 1 consistent with mounds exhibiting smooth (faceted) walls, whereas an anomalous scaling behavior with a proper local roughness exponents (alpha(loc) < 1) dominates at l > l(c). The introduction of nitrite in the solution, a common additive used in phosphating baths, leads to some changes in the scaling behavior as a consequence of different generated chemical surface conditions during dissolution. The different dissolution rates of the exposed crystal orientations and surface diffusion of adatoms were identified as the physical processes that govern the interface dynamic for this system.
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Affiliation(s)
- A G Muñoz
- Institute of Thin Films and Interfaces (ISG 3), Research Centre Juelich, D-52425 Juelich, Germany.
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19
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Salvarezza RC. Self assembled thiols monolayers on Au(111) surfaces: structure defects and dynamics. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305095243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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20
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Abstract
The surface structures, defects and dynamics of self-assembled monolayers (SAMs) on Au(111) are reviewed. In the case of the well-known c(4 x 2) and radical 3 x radical 3 R30 degrees surface structures, the present discussion is centered on the determination of the adsorption sites. A more complex scenario emerges for the striped phases, where a variety of surface structures that depends on surface coverage are described. Recently reported surface structures at non-saturation coverage show the richness of the self-assembly process. The study of surface dynamics sheds light on the relative stability of some of these surface structures. Typical defects at the alkanethiol monolayer are shown and discussed in relation to SAMs applications.
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Affiliation(s)
- C Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4 Casilla de Correo 16 (1900), La Plata, Argentina
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21
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Hernández Creus A, Gimeno Y, Díaz P, Vázquez L, González S, Salvarezza RC, Arvia AJ. Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction. J Phys Chem B 2004. [DOI: 10.1021/jp0375214] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Hernández Creus
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
| | - Y. Gimeno
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
| | - P. Díaz
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
| | - L. Vázquez
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
| | - S. González
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
| | - R. C. Salvarezza
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
| | - A. J. Arvia
- Departamento de Química Física, Universidad de la Laguna, Spain, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata−CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
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22
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Benítez G, Vericat C, Tanco S, Remes Lenicov F, Castez MF, Vela ME, Salvarezza RC. Role of surface heterogeneity and molecular interactions in the charge-transfer process through self-assembled thiolate monolayers on Au(111). Langmuir 2004; 20:5030-7. [PMID: 15984265 DOI: 10.1021/la036440w] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A comparative study of charge-transfer processes from/to methyl-terminated and carboxylate-terminated thiolate-covered Au(111) surfaces to/from immobilized methylene blue (MB) molecules is presented. Scanning tunneling microscopy images with molecular resolution reveal the presence of molecular-sized defects, missing rows, and crystalline domains with different tilts that turn the thickness of the alkanethiolate SAM (the spacer) uncertain. The degree of surface heterogeneity at the SAMs increases as the number of C units (n) in the hydrocarbon chain decreases from n = 6. Defective regions act as preferred paths for MB incorporation into the methyl-terminated SAMs, driven by hydrophobic forces. The presence of negative-charged terminal groups at the SAMs reduces the number of molecules that can be incorporated, immobilizing them at the outer plane of the monolayer. Only MB molecules incorporated into the SAMs close to the Au(111) surface (at a distance < 0.5 nm) are electrochemically active. MB molecules trapped in different defects explain the broad shape and humps observed in the voltammogram of the redox couple. The heterogeneous charge-transfer rate constants for MB immobilized into methyl-terminated thiolate SAMs are higher than those estimated for carboxylate- terminated SAMs, suggesting a different orientation of the immobilized molecule in the thiolate environment.
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Affiliation(s)
- G Benítez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata-CONICET, Sucursal 4 Casilla de Correo 16, 1900 La Plata, Argentina
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23
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Muñoz AG, Benitez G, Vela ME, Salvarezza RC. Influence of the adsorption of N species on the anodic dissolution of Ni. Langmuir 2004; 20:2361-2368. [PMID: 15835697 DOI: 10.1021/la0359225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The dissolution and passivation of Ni in nitrite-containing acid solutions are investigated by Auger spectroscopy, atomic force microscopy, and conventional electrochemical techniques. The dissolution/ passivation of the Ni surface is consistent with a competition between adsorbed OH- and nitrogen-containing species with a potential-dependent surface coverage. Nitrogen-containing species hinder the passivation of the Ni surface, shifting the formation of the complex nickel hydroxide/oxide film to more positive potential values. The dynamics of the dissolving interface, followed by atomic force microscopy, reflect first the competition of adsorbed species, leading to the development of protrusions and cavities, and finally the formation of the passive film that promotes surface smoothening by a preferential dissolution of the protrusion tips under ohmic control.
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Affiliation(s)
- A G Muñoz
- Instituto de Ingeniería Electroquímica y Corrosión, Departamento de Ingeniería Química, Universidad Nacional del Sur, 8000 Bahia Blanca, Argentina.
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24
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Fonticelli M, Azzaroni O, Benítez G, Martins ME, Carro P, Salvarezza RC. Molecular Self-Assembly on Ultrathin Metallic Surfaces: Alkanethiolate Monolayers on Ag(1 × 1)−Au(111). J Phys Chem B 2004. [DOI: 10.1021/jp0359384] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Fonticelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - O. Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - G. Benítez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - M. E. Martins
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - P. Carro
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
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25
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Azzaroni O, Vela ME, Fonticelli M, Benítez G, Carro P, Blum B, Salvarezza RC. Electrodesorption Potentials of Self-Assembled Alkanethiolate Monolayers on Copper Electrodes. An Experimental and Theoretical Study. J Phys Chem B 2003. [DOI: 10.1021/jp036319y] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- O. Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - M. Fonticelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - G. Benítez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - P. Carro
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - B. Blum
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CONICET, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
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26
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Vericat C, Vela ME, Andreasen GA, Salvarezza RC, Borgatti F, Felici R, Lee TL, Renner F, Zegenhagen J, Martín-Gago JA. Following adsorption kinetics at electrolyte/metal interfaces through crystal truncation scattering: sulfur on Au(111). Phys Rev Lett 2003; 90:075506. [PMID: 12633245 DOI: 10.1103/physrevlett.90.075506] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2002] [Indexed: 05/24/2023]
Abstract
Combining electrochemical methods, in situ scanning tunneling microscopy, and surface x-ray diffraction allowed study of the structure and kinetics of S/Au(111) electrodes in aqueous electrolytes under potential control. Integrated intensities of a particular crystal truncation rod at anti-Bragg conditions were used to trace the sulfur adsorption and desorption as a function of electrode potential in real time. The S desorption is a first order process and the adsorption follows a Langmuir isotherm. A weakly bound S layer is found on the surface before charge transfer, and then specific adsorption occurs.
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Affiliation(s)
- C Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), (CIC-CONICET-UNLP), La Plata, Argentina
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27
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Azzaroni O, Vela ME, Andreasen G, Carro P, Salvarezza RC. Electrodesorption Potentials of Self-Assembled Alkanethiolate Monolayers on Ag(111) and Au(111). An Electrochemical, Scanning Tunneling Microscopy and Density Functional Theory Study. J Phys Chem B 2002. [DOI: 10.1021/jp0219653] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- O. Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - G. Andreasen
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - P. Carro
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata - CONICET, Sucursal 4 Casilla de Correo 16 (1900) La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Tenerife, Spain
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28
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de Leon PFJ, Albano EV, Salvarezza RC, Solari HG. Interface dynamics for copper electrodeposition: the role of organic additives in the growth mode. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 66:042601. [PMID: 12443238 DOI: 10.1103/physreve.66.042601] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2001] [Revised: 08/01/2002] [Indexed: 05/24/2023]
Abstract
An atomistic model for Cu electrodeposition under nonequilibrium conditions is presented. Cu electrodeposition takes place with a height-dependent deposition rate that accounts for fluctuations in the local Cu2+ ions concentration at the interface, followed by surface diffusion. This model leads to an unstable interface with the development of protrusions and grooves. Subsequently the model is extended to account for the presence of organic additives, which compete with Cu2+ for adsorption at protrusions, leading to a stable interface with scaling exponents consistent with those of the Edwards-Wilkinson equation. The model reproduces the interface evolution experimentally observed for Cu electrodeposition in the absence and in the presence of organic additives.
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Affiliation(s)
- Pablo F J de Leon
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), UNLP, CONICET, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
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29
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Brunetti V, Blum B, Salvarezza RC, Arvia AJ, Schilardi PL, Cuesta A, Gayone JE, Zampieri G. Scanning Tunneling Microscopy, Fourier Transform Infrared Reflection−Absorption Spectroscopy, and X-ray Photoelectron Spectroscopy of Thiourea Adsorption from Aqueous Solutions on Silver (111). J Phys Chem B 2002. [DOI: 10.1021/jp0209695] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vericat C, Lenicov FR, Tanco S, Andreasen G, Vela ME, Salvarezza RC. Building Complex Two− Dimensional Structures: Methylene Blue on Self-Assembled Monolayer−Covered Au(111). J Phys Chem B 2002. [DOI: 10.1021/jp0210071] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - F. Remes Lenicov
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - S. Tanco
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - G. Andreasen
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La PlataCONICET, Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
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Martin H, Vericat C, Andreasen G, Vela ME, Salvarezza RC. A Monte Carlo simulation for the stripping of the √3×√3 R30° alkanethiol lattice from Au(111) terraces and steps. J Chem Phys 2002. [DOI: 10.1063/1.1490922] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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32
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Ocon P, Vazquez L, Salvarezza RC, Arvia AJ, Herrasti P, Vara JM. Scanning Tunneling Microscopy Fractal Characterization of Poly(o-toluidine) Films Produced Electrochemically on Polyfaceted Gold Single Crystal Spheres. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100060a032] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Vazquez L, Hernandez Creus A, Carro P, Ocon P, Herrasti P, Palacio C, Vara JM, Salvarezza RC, Arvia AJ. Scanning tunneling microscopy and scanning electron microscopy observations of the early stage of silver deposition on graphite single crystal electrodes. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100204a062] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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34
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Zubimendi JL, Vazquez L, Ocon P, Vara JM, Triaca WE, Salvarezza RC, Arvia AJ. Early stages of platinum electrodeposition on highly oriented pyrolytic graphite: scanning tunneling microscopy imaging and reaction pathway. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100121a041] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Gomez-Rodriguez JM, Baro AM, Vazquez L, Salvarezza RC, Vara JM, Arvia AJ. Fractal surfaces of gold and platinum electrodeposits: dimensionality determination by scanning tunneling microscopy. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100180a064] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Pasquale MA, Marchiano SL, Schilardi PL, Salvarezza RC, Arvia AJ. Stability analysis of branched silver electrodeposits: solid phase growth under a marginally stable regime. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 65:041608. [PMID: 12005838 DOI: 10.1103/physreve.65.041608] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2001] [Revised: 12/05/2001] [Indexed: 05/23/2023]
Abstract
The mass-transport controlled growth of silver deposits at the early stage of multiple bump formation, and when a silver single needle growth regime is attained, are investigated. Linear stability analysis as proposed by Barkey, Muller, and Tobias [J. Electrochem. Soc. 136, 2199 (1989)] is applied to kinetic mesoscale data. A reasonable correlation between the current density and the average amplitude of unstable perturbation is established.
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Affiliation(s)
- M A Pasquale
- Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
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Gimeno Y, Hernández Creus A, Carro P, González S, Salvarezza RC, Arvia AJ. Electrochemical Formation of Palladium Islands on HOPG: Kinetics, Morphology, and Growth Mechanisms. J Phys Chem B 2002. [DOI: 10.1021/jp014176e] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Gimeno
- Departamento de Química Física, Universidad de La Laguna, La Laguna, Tenerife, Spain, and Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Sucursal 4, Casilla de Correo 16 (1900) La Plata, Argentina
| | - A. Hernández Creus
- Departamento de Química Física, Universidad de La Laguna, La Laguna, Tenerife, Spain, and Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Sucursal 4, Casilla de Correo 16 (1900) La Plata, Argentina
| | - P. Carro
- Departamento de Química Física, Universidad de La Laguna, La Laguna, Tenerife, Spain, and Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Sucursal 4, Casilla de Correo 16 (1900) La Plata, Argentina
| | - S. González
- Departamento de Química Física, Universidad de La Laguna, La Laguna, Tenerife, Spain, and Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Sucursal 4, Casilla de Correo 16 (1900) La Plata, Argentina
| | - R. C. Salvarezza
- Departamento de Química Física, Universidad de La Laguna, La Laguna, Tenerife, Spain, and Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Sucursal 4, Casilla de Correo 16 (1900) La Plata, Argentina
| | - A. J. Arvia
- Departamento de Química Física, Universidad de La Laguna, La Laguna, Tenerife, Spain, and Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Sucursal 4, Casilla de Correo 16 (1900) La Plata, Argentina
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Vericat C, Andreasen G, Vela ME, Martin H, Salvarezza RC. Following transformation in self-assembled alkanethiol monolayers on Au(111) by in situ scanning tunneling microscopy. J Chem Phys 2001. [DOI: 10.1063/1.1403000] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Vela ME, Martin H, Vericat C, Andreasen G, Hernández Creus A, Salvarezza RC. Electrodesorption Kinetics and Molecular Interactions in Well-Ordered Thiol Adlayers On Au(111). J Phys Chem B 2000. [DOI: 10.1021/jp002142l] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CIC-CONICET-UNLP, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Spain
| | - H. Martin
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CIC-CONICET-UNLP, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Spain
| | - C. Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CIC-CONICET-UNLP, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Spain
| | - G. Andreasen
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CIC-CONICET-UNLP, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Spain
| | - A. Hernández Creus
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CIC-CONICET-UNLP, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Spain
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CIC-CONICET-UNLP, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina, and Departamento de Química Física, Universidad de La Laguna, Spain
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Martín H, Carro P, Hernández Creus A, Morales J, Fernández G, Esparza P, González S, Salvarezza RC, Arvia AJ. Interplay of Surface Diffusion and Surface Tension in the Evolution of Solid/Liquid Interfaces. Dealloying of β-Brass in Aqueous Sodium Chloride. J Phys Chem B 2000. [DOI: 10.1021/jp001077c] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- H. Martín
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - P. Carro
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - A. Hernández Creus
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - J. Morales
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - G. Fernández
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - P. Esparza
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - S. González
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - R. C. Salvarezza
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
| | - A. J. Arvia
- Departamento de Química Fisica, Facultad de Química, and Departamento de Química Inorgánica, Facultad de Química, Universidad de La Laguna, Spain, and Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA) (UNLP-CONICET-CIC Bs.As.), Sucursal 4, Casilla de Correo 16, (1900) La Plata, Argentina
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Azzaroni O, Andreasen G, Blum B, Salvarezza RC, Arvia AJ. Scanning Tunneling Microscopy Studies of the Electrochemical Reactivity of Thiourea on Au(111) Electrodes. J Phys Chem B 2000. [DOI: 10.1021/jp993511k] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- O. Azzaroni
- INIFTA, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata - CONICET - CICBsAs, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - G. Andreasen
- INIFTA, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata - CONICET - CICBsAs, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - B. Blum
- INIFTA, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata - CONICET - CICBsAs, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - R. C. Salvarezza
- INIFTA, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata - CONICET - CICBsAs, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - A. J. Arvia
- INIFTA, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata - CONICET - CICBsAs, Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
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Vericat C, Andreasen G, Vela ME, Salvarezza RC. Dynamics of Potential-Dependent Transformations in Sulfur Adlayers on Au(111) Electrodes. J Phys Chem B 1999. [DOI: 10.1021/jp9927451] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) (CIC-CONICET-UNLP), Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - G. Andreasen
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) (CIC-CONICET-UNLP), Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - M. E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) (CIC-CONICET-UNLP), Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
| | - R. C. Salvarezza
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) (CIC-CONICET-UNLP), Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina
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Andreasen G, Vericat C, Vela ME, Salvarezza RC. Dynamics of sulfur adlayer transformations at metal/electrolyte interfaces. J Chem Phys 1999. [DOI: 10.1063/1.480331] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Martín H, Carro P, Hernández Creus A, González S, Salvarezza RC, Arvia AJ. Kinetics and Mechanism of Gold Dendrite Electroformation on C(0001). Activation Energy for Gold Adatom Surface Diffusion. J Phys Chem B 1999. [DOI: 10.1021/jp982695k] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Terán Arce F, Vela ME, Salvarezza RC, Arvia AJ. The dynamic behavior of butanethiol and dodecanethiol adsorbates on Au(111) terraces. J Chem Phys 1998. [DOI: 10.1063/1.477190] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Salvarezza RC, Vázquez L, Míguez H, Mayoral R, López C, Meseguer F. Edward-Wilkinson Behavior of Crystal Surfaces Grown By Sedimentation of SiO2 Nanospheres. Phys Rev Lett 1996; 77:4572-4575. [PMID: 10062572 DOI: 10.1103/physrevlett.77.4572] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Vela ME, Andreasen G, Salvarezza RC, Hernández-Creus A, Arvia AJ. In situ sequential STM imaging of structural changes resulting from the electrodissolution of silver crystal surfaces in aqueous perchloric acid: The roughening kinetics. Phys Rev B Condens Matter 1996; 53:10217-10224. [PMID: 9982590 DOI: 10.1103/physrevb.53.10217] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Vázquez L, Salvarezza RC, Herrasti P, Ocón P, Vara JM, Arvia AJ. Dynamic-scaling exponents and the roughening kinetics of gold electrodeposits. Phys Rev B Condens Matter 1995; 52:2032-2037. [PMID: 9981274 DOI: 10.1103/physrevb.52.2032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zubimendi JL, Vela ME, Salvarezza RC, Vázquez L, Vara JM, Arvia AJ. Fractal to nonfractal behavior of vapor-deposited gold surfaces and the relationship to the substrate temperature. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1994; 50:1367-1371. [PMID: 9962103 DOI: 10.1103/physreve.50.1367] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Vázquez L, Salvarezza RC, Ocón P, Herrasti P, Vara JM, Arvia AJ. Self-affine fractal electrodeposited gold surfaces: Characterization by scanning tunneling microscopy. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1994; 49:1507-1511. [PMID: 9961362 DOI: 10.1103/physreve.49.1507] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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