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Piccinini E, González GA, Azzaroni O, Battaglini F. Mass and charge transport in highly mesostructured polyelectrolyte/electroactive-surfactant multilayer films. J Colloid Interface Sci 2021; 581:595-607. [PMID: 32810726 DOI: 10.1016/j.jcis.2020.07.060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/10/2020] [Accepted: 07/11/2020] [Indexed: 10/23/2022]
Abstract
HYPOTHESIS Dimensionally stable electroactive films displaying spatially addressed redox sites is still a challenging goal due to gel-like structure. Polyelectrolyte and surfactants can yield highly mesostructured films using simple buildup strategies as layer-by-layer. The use of redox modified surfactants is expected to introduce order and an electroactive response in thin films. EXPERIMENTS The assembly of polyacrylic acid and different combinations of redox-modified and unmodified hexadecyltrimethylammonium bromide yields highly structured and electroactive thin films. The growth, viscoelastic properties, mass, and electron transport of these films were studied by combining electrochemical and quartz crystal balance with dissipation experiments. FINDINGS Our results show that the films are highly rigid and poorly hydrated. The mass and charge transport reveal that the ingress (egress) of the counter ions during the electrochemical oxidation (reduction) is accompanied with a small amount of water, which is close to their hydration sphere. Thus, the generated mesostructured films present an efficient charge transport with negligible changes in their structures during the electron transfer process. The control over the meso-organization and its stability represents a promising tool in the construction of devices where the vectorial transfer of electrons, or ions, is required.
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Affiliation(s)
- Esteban Piccinini
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) -Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET, Suc. 4, CC 16, La Plata, Argentina
| | - Graciela A González
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires - CONICET, Ciudad Universitaria, Pabellón 2 C1428EHA, Buenos Aires, Argentina
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) -Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET, Suc. 4, CC 16, La Plata, Argentina.
| | - Fernando Battaglini
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires - CONICET, Ciudad Universitaria, Pabellón 2 C1428EHA, Buenos Aires, Argentina.
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2
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Coria‐Oriundo LL, Ceretti H, Roupioz Y, Battaglini F. Redox Polyelectrolyte Modified Gold Nanoparticles Enhance the Detection of Adenosine in an Electrochemical Split‐Aptamer Assay. ChemistrySelect 2020. [DOI: 10.1002/slct.202002488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Lucy L. Coria‐Oriundo
- INQUIMAE (CONICET) Departamento de Química Inorgánica Analítica y Química Física Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Ciudad Universitaria, Pabellón 2 C1428EHA Buenos Aires Argentina
- Facultad de Ciencias Universidad Nacional de Ingeniería Av. Túpac Amaru 210 Lima 25, Perú
| | - Helena Ceretti
- Universidad Nacional de Gral. Sarmiento, J. M. Gutiérrez 1150 B1613GSX, Los Polvorines, Prov. de Buenos Aires Argentina
| | - Yoann Roupioz
- Univ. Grenoble Alpes CNRS CEA SyMMES 38000 Grenoble France
| | - Fernando Battaglini
- INQUIMAE (CONICET) Departamento de Química Inorgánica Analítica y Química Física Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Ciudad Universitaria, Pabellón 2 C1428EHA Buenos Aires Argentina
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3
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Piccinini E, Ceolín M, Battaglini F, Azzaroni O. Mesostructured Electroactive Thin Films Through Layer-by-Layer Assembly of Redox Surfactants and Polyelectrolytes. Chempluschem 2020; 85:1616-1622. [PMID: 32432385 DOI: 10.1002/cplu.202000358] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 05/09/2020] [Indexed: 12/17/2022]
Abstract
Electroactive thin films are an important element in the devices devoted to energy conversion, actuators, and molecular electronics, among others. Their build-up by the layer-by-layer technique is an attractive choice since a fine control over the thickness and composition can be achieved. However, most of the assemblies described in the literature show a lack of internal order, and their thicknesses change upon oxidation-state alterations. In this work, we describe the formation of layer-by-layer assemblies of redox surfactants and polyelectrolytes that leads to the construction of mesoscale organized electroactive films. In contrast to thin films prepared with traditional redox polymers, here, the redox surfactant does not only allow the control of the film meso-organization (from 2D hexagonal to circular hexagonal phases) but it also allows the control of the number and position of the redox centers. Finally, these films show high stability and a negligible structural deformation under redox-state changes.
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Affiliation(s)
- Esteban Piccinini
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CONICET, Diagonal 113 y 64, 1900, La Plata, Argentina
| | - Marcelo Ceolín
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CONICET, Diagonal 113 y 64, 1900, La Plata, Argentina
| | - Fernando Battaglini
- INQUIMAE (CONICET), Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos, Aires, Argentina
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CONICET, Diagonal 113 y 64, 1900, La Plata, Argentina
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4
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Zigah D, Lojou E, Poulpiquet A. Micro‐ and Nanoscopic Imaging of Enzymatic Electrodes: A Review. ChemElectroChem 2019. [DOI: 10.1002/celc.201901065] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Dodzi Zigah
- Univ. Bordeaux, CNRSBordeaux INP ISM UMR 5255 33400 Talence France
| | - Elisabeth Lojou
- Aix-Marseille Univ., CNRSBIP, UMR 7281 31 Chemin Aiguier 13009 Marseille France
| | - Anne Poulpiquet
- Aix-Marseille Univ., CNRSBIP, UMR 7281 31 Chemin Aiguier 13009 Marseille France
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5
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Torbensen K, Patel AN, Anne A, Chovin A, Demaille C, Bataille L, Michon T, Grelet E. Immuno-Based Molecular Scaffolding of Glucose Dehydrogenase and Ferrocene Mediator on fd Viral Particles Yields Enhanced Bioelectrocatalysis. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01263] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Kristian Torbensen
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Anisha N. Patel
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Agnès Anne
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Arnaud Chovin
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Christophe Demaille
- Laboratoire d’Electrochimie Moléculaire, Université Paris Diderot, Sorbonne Paris Cité, Unité Mixte de Recherche Université − UMR 7591 CNRS, Bâtiment Lavoisier, 15 Rue Jean-Antoine de Baïf, 75205 CEDEX 13 Paris, France
| | - Laure Bataille
- UMR 1332 Biologie du Fruit et Pathologie, INRA, Université de Bordeaux, 71, Avenue Edouard Bourlaux, CS 20032-33882 CEDEX Villenave d’Ornon, France
| | - Thierry Michon
- UMR 1332 Biologie du Fruit et Pathologie, INRA, Université de Bordeaux, 71, Avenue Edouard Bourlaux, CS 20032-33882 CEDEX Villenave d’Ornon, France
| | - Eric Grelet
- Centre de Recherche Paul-Pascal, UMR 5031 CNRS, Université de Bordeaux, 115 Avenue Schweitzer, 33600 Pessac, France
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6
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Agazzi ML, Herrera SE, Cortez ML, Marmisollé WA, von Bilderling C, Pietrasanta LI, Azzaroni O. Continuous assembly of supramolecular polyamine-phosphate networks on surfaces: preparation and permeability properties of nanofilms. SOFT MATTER 2019; 15:1640-1650. [PMID: 30676599 DOI: 10.1039/c8sm02387e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Supramolecular self-assembly of molecular building blocks represents a powerful "nanoarchitectonic" tool to create new functional materials with molecular-level feature control. Here, we propose a simple method to create tunable phosphate/polyamine-based films on surfaces by successive assembly of poly(allylamine hydrochloride) (PAH)/phosphate anions (Pi) supramolecular networks. The growth of the films showed a great linearity and regularity with the number of steps. The coating thickness can be easily modulated by the bulk concentration of PAH and the deposition cycles. The PAH/Pi networks showed chemical stability between pH 4 and 10. The transport properties of the surface assemblies formed from different deposition cycles were evaluated electrochemically by using different redox probes in aqueous solution. The results revealed that either highly permeable films or efficient anion transport selectivity can be created by simply varying the concentration of PAH. This experimental evidence indicates that this new strategy of supramolecular self-assembly can be useful for the rational construction of single polyelectrolyte nanoarchitectures with multiple functionalities.
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Affiliation(s)
- Maximiliano L Agazzi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), (UNLP, CONICET), Sucursal 4, Casilla de Correo 16, 1900 La Plata, Argentina.
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7
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Zappi D, Coria-Oriundo LL, Piccinini E, Gramajo M, von Bilderling C, Pietrasanta LI, Azzaroni O, Battaglini F. The effect of ionic strength and phosphate ions on the construction of redox polyelectrolyte–enzyme self-assemblies. Phys Chem Chem Phys 2019; 21:22947-22954. [DOI: 10.1039/c9cp04037d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The type and concentration of ions present in a solution containing an electroactive polyelectrolyte shape its configuration, adsorption, and electrochemical response.
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Affiliation(s)
- Daniele Zappi
- INQUIMAE (CONICET)
- Departamento de Química Inorgánica
- Analítica y Química Física
- Facultad de Ciencias Exactas y Naturales
- Universidad de Buenos Aires
| | - Lucy L. Coria-Oriundo
- INQUIMAE (CONICET)
- Departamento de Química Inorgánica
- Analítica y Química Física
- Facultad de Ciencias Exactas y Naturales
- Universidad de Buenos Aires
| | - Esteban Piccinini
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- (UNLP, CONICET)
- 1900 La Plata
- Argentina
| | - Marcos Gramajo
- INQUIMAE (CONICET)
- Departamento de Química Inorgánica
- Analítica y Química Física
- Facultad de Ciencias Exactas y Naturales
- Universidad de Buenos Aires
| | - Catalina von Bilderling
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- (UNLP, CONICET)
- 1900 La Plata
- Argentina
- Departamento de Física
| | - Lía I. Pietrasanta
- Departamento de Física
- Facultad de Ciencias Exactas y Naturales
- Universidad de Buenos Aires
- C1428EHA Buenos Aires
- Argentina
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
- (UNLP, CONICET)
- 1900 La Plata
- Argentina
| | - Fernando Battaglini
- INQUIMAE (CONICET)
- Departamento de Química Inorgánica
- Analítica y Química Física
- Facultad de Ciencias Exactas y Naturales
- Universidad de Buenos Aires
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8
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Huang Z, Qi P, Liu Y, Chai C, Wang Y, Song A, Hao J. Ionic-surfactants-based thermotropic liquid crystals. Phys Chem Chem Phys 2019; 21:15256-15281. [DOI: 10.1039/c9cp02697e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Ionic surfactants can be combined with various functional groups through electrostatic interaction, resulting in a series of thermotropic liquid crystals (TLCs).
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Affiliation(s)
- Zhaohui Huang
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Ping Qi
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Yihan Liu
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Chunxiao Chai
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Yitong Wang
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Aixin Song
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Jingcheng Hao
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
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9
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Saravanan N, Mayuri P, Senthil Kumar A. Improved Electrical Wiring of Glucose Oxidase Enzyme with an in-Situ Immobilized Mn(1,10-Phenanthroline) 2Cl 2-Complex/Multiwalled Carbon Nanotube-Modified Electrode Displaying Superior Performance to Os-Complex for High-Current Sensitivity Bioelectrocatalytic and Biofuel Cell Applications. ACS APPLIED BIO MATERIALS 2018; 1:1758-1767. [PMID: 34996224 DOI: 10.1021/acsabm.8b00584] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The search for a new and efficient transducer that can electrically connect enzyme active sites, like flavin adenine dinucleotide in glucose oxidase (GOx), with the electrode surface is a cutting-edge research area. Currently, Os(bpy)-complex pendent polyvinylpyridine/polyvinyl imidazole/pyridinium hydrogel based chemically modified electrodes have been widely used for this purpose (bpy = 2,2'-bipyridine). Herein, we report, a [Mn2III(phen)4(O)(Cl)2]2+ complex/Nafion-immobilized carboxylic acid-functionalized multiwalled carbon nanotube modified glassy carbon electrode (GCE/f-MWCNT@Mn2(Phen)4O(Cl)2-Nf, phen = 1,10-phenanthroline), prepared by an in-situ electrochemical method using the precursor, Mn(phen)2Cl2, as an efficient and low cost alternate to the Os-complex transducer, for the glucose oxidase enzyme (GOx) based bio-electro-catalytic system. The existence of the key active site, [Mn2III(phen)4(O)(Cl)2]2+, on the modified electrode was confirmed by physicochemical characterizations using transmission electron microscope, Raman, infrared, and UV-vis spectroscopes and electrospray ionization mass spectrometry techniques. The Mn-complex modified electrode showed a redox peak at E°' = 0.55 V vs Ag/AgCl in neutral solution with a surface excess (ΓMn) value of 5.6 × 10-9 mol cm-2. The GOx enzyme bioanode prepared by adsorbing GOx on the Mn-complex modified electrode has shown an efficient bioelectrocatalytic oxidation of glucose with a Tafel slope value of 111 mV dec-1. Amperometric i-t analysis of glucose showed a calibration plot in a linear range of 50-550 μM and with current sensitivity of 316.7 μA mM-1 cm-2. The current sensitivity value obtained here is about 2-80 000 times higher than that of the Os(bpy)-complex based transducers used for GOx based bio-electro-catalytic applications. Utilizing this new bioanode system along with a Pt-based oxygen reduction electrode, a new biofuel cell was constructed and achieved a power density value 7.5 μW cm-2.
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Affiliation(s)
- Natarajan Saravanan
- Nano and Bioelectrochemistry Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology University, Vellore-632 014, India
| | - Pinapeddavari Mayuri
- Nano and Bioelectrochemistry Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology University, Vellore-632 014, India
| | - Annamalai Senthil Kumar
- Nano and Bioelectrochemistry Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology University, Vellore-632 014, India.,Carbon Dioxide Research and Green Technology Centre, Vellore Institute of Technology University, Vellore-632 014, India
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10
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Cortez ML, Ceolín M, Cuellar Camacho L, Donath E, Moya SE, Battaglini F, Azzaroni O. Solvent Effects on the Structure-Property Relationship of Redox-Active Self-Assembled Nanoparticle-Polyelectrolyte-Surfactant Composite Thin Films: Implications for the Generation of Bioelectrocatalytic Signals in Enzyme-Containing Assemblies. ACS APPLIED MATERIALS & INTERFACES 2017; 9:1119-1128. [PMID: 27977921 DOI: 10.1021/acsami.6b13456] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The search for strategies to improve the performance of bioelectrochemical platforms based on supramolecular materials has received increasing attention within the materials science community, where the main objective is to develop low-cost and flexible routes using self-assembly as a key enabling process. Important contributions to the performance of such bioelectrochemical devices have been made based on the integration and supramolecular organization of redox-active polyelectrolyte-surfactant complexes on electrode supports. Here, we examine the influence of the processing solvent on the interplay between the supramolecular mesoorganization and the bioelectrochemical properties of redox-active self-assembled nanoparticle-polyelectrolyte-surfactant nanocomposite thin films. Our studies reveal that the solvent used in processing the supramolecular films and the presence of metal nanoparticles not only have a substantial influence in determining the mesoscale organization and morphological characteristics of the film but also have a strong influence on the efficiency and performance of the bioelectrochemical system. In particular, a higher bioelectrochemical response is observed when nanocomposite supramolecular films were cast from aqueous solutions. These observations seem to be associated with the fact that the use of aqueous solvents increases the hydrophilicity of the film, thus favoring the access of glucose, particularly at low concentrations. We believe that these results improve our current understanding of supramolecular nanocomposite materials generated via polyelectrolyte-surfactant complexes, in order to use the processing conditions as a variable to improve the performance of bioelectrochemical devices.
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Affiliation(s)
- M Lorena Cortez
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires , Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata , CONICET, CC 16 Suc. 4 (1900), La Plata, Argentina
| | - Marcelo Ceolín
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata , CONICET, CC 16 Suc. 4 (1900), La Plata, Argentina
| | - Luis Cuellar Camacho
- Institute of Biophysics and Medical Physics, Faculty of Medicine, University of Leipzig , Leipzig, Germany
| | - Edwin Donath
- Institute of Biophysics and Medical Physics, Faculty of Medicine, University of Leipzig , Leipzig, Germany
| | - Sergio E Moya
- CIC biomaGUNE , Paseo Miramón 182, 20009 San Sebastián, Gipuzkoa, Spain
| | - Fernando Battaglini
- INQUIMAE, Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires , Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata , CONICET, CC 16 Suc. 4 (1900), La Plata, Argentina
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11
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Cortez ML, Ceolín M, Azzaroni O, Battaglini F. Formation of redox-active self-assembled polyelectrolyte–surfactant complexes integrating glucose oxidase on electrodes: Influence of the self-assembly solvent on the signal generation. Bioelectrochemistry 2015; 105:117-22. [DOI: 10.1016/j.bioelechem.2015.06.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 05/23/2015] [Accepted: 06/10/2015] [Indexed: 11/28/2022]
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12
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Castañeda AD, Alligrant TM, Loussaert JA, Crooks RM. Electrocatalytic amplification of nanoparticle collisions at electrodes modified with polyelectrolyte multilayer films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:876-885. [PMID: 25568965 DOI: 10.1021/la5043124] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report electrochemical catalytic amplification of individual collisions between ∼57 nm diameter Pt nanoparticles (Pt NPs) and 12.5 μm diameter Au ultramicroelectrodes modified with passivating, electrostatically assembled polyelectrolyte multilayer (PEM) films prepared by the layer-by-layer deposition method. Two key findings are reported. First, despite the thicknesses of the insulating PEM films, which range up to 5 nm, electrons are able to tunnel from the Pt NPs to the electrode resulting in electrocatalytic N2H4 oxidation at the PEM film-solution interface. These single-particle measurements are in accord with prior reports showing that the electrochemical activity of passive PEM films can be reactivated by adsorption of metallic NPs. Second, it is possible to control the frequency of the collisions by manipulating the net electrostatic charge present on the outer surface of the PEM thin film. These results, which demonstrate that chemistry can be used to control electrocatalytic amplification, set the stage for future sensing applications.
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Affiliation(s)
- Alma D Castañeda
- Department of Chemistry, Center for Electrochemistry, and the Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
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13
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Piccinini E, Pallarola D, Battaglini F, Azzaroni O. Recognition-driven assembly of self-limiting supramolecular protein nanoparticles displaying enzymatic activity. Chem Commun (Camb) 2015; 51:14754-7. [DOI: 10.1039/c5cc05837f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report the recognition-driven assembly of self-limiting protein nanoparticles displaying enzymatic activity.
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Affiliation(s)
- Esteban Piccinini
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) – Departamento de Química
- Facultad de Ciencias Exactas
- Universidad Nacional de La Plata – CONICET
- 1900 La Plata
- Argentina
| | - Diego Pallarola
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) – Departamento de Química
- Facultad de Ciencias Exactas
- Universidad Nacional de La Plata – CONICET
- 1900 La Plata
- Argentina
| | - Fernando Battaglini
- INQUIMAE
- Departamento de Química Inorgánica
- Analítica y Química Física
- Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires
- Ciudad Universitaria
| | - Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) – Departamento de Química
- Facultad de Ciencias Exactas
- Universidad Nacional de La Plata – CONICET
- 1900 La Plata
- Argentina
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