Electrochemistry at ultrathin polyelectrolyte films self-assembled at planar gold electrodes

Han, Sue; Lindholm-Sethson, Britta

doi:10.1016/s0013-4686(99)00295-9

Cited by 66 publications

(75 citation statements)

References 23 publications

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“…The half wave potential remains practically constant but the peak separation increases from an initial value of 70 mV. These values are similar to those reported by Han et al [16] with similar multilayer films.…”

Section: Resultssupporting

confidence: 90%

Electrochemical Characterization of a Self-Assembled Polyelectrolyte Film

Silva¹,

Barreira²,

Moura³

et al. 2003

Port. Electrochim. Acta

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Polyelectrolyte thin films constructed using the method proposed by Decher and coworkers are studied using several electrochemical techniques, such as cyclic voltammetry and linear sweep voltammetry with rotative disc electrode. The main goal of this work is to evaluate the influence of the number of layers and the charge of the external layer in thin film permeability. These films seem to have electrochemical properties strongly influenced by deposition conditions. It's shown that the increased number of layers lowers film permeability.

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Section: Resultssupporting

confidence: 90%

Electrochemical Characterization of a Self-Assembled Polyelectrolyte Film

Silva¹,

Barreira²,

Moura³

et al. 2003

Port. Electrochim. Acta

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“…In quite good agreement with the cryoporometry experiments, the same films display some permeability for ions having an ionic radius of the order of one nanometer [61]. (PSS-PAH) n [62] and (PDADMAC-PSS) n films (where PDADMAC stands for poly(diallyldimethyl aminomethane)) become however impermeable to multivalent ions like hexacyanoferrate when the number of "layer pairs" is typically higher than 5.…”

Section: Selected Properties Of Films Produced In a Sbs Mannersupporting

confidence: 76%

Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

Michel¹,

Toniazzo²,

Ruch³

et al. 2012

ISRN Materials Science

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The modification of solid-liquid interfaces with polyelectrolyte multilayer films appears as a versatile tool to confer new functionalities to surfaces in environmentally friendly conditions. Indeed such films are deposited by alternate dipping of the substrates in aqueous solutions containing the interacting species or spraying these solutions on the surface of the substrate. Spin coating is more and more used to produce similar films. The aim of this short review article is to provide an unifying picture about the deposition mechanisms of polyelectrolyte multilayer films. Often those films are described as growing either in a linear or in a supralinear growth regime with the number of deposited "layer pairs". The growth regime of PEM films can be controlled by operational parameters like the temperature or the ionic strength of the used solutions. The control over the growth regime of the films as a function of the number of deposition steps allows to control their functional properties: either hard and impermeable films in the case of linear growth or soft and permeable films in the case of supralinear growth. Such different properties can be obtained with a given combination of interacting species by changing the operational parameters during the film deposition.

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“…These CVs are similar to those observed in PEMUs. [18][19][20][21][22][23][24][25][26][27][28] As more layers are added, the peak current decreases and nonlinear slow diffusion begins to take place. A transition from peak-shaped to plateau-shaped voltammograms is then observed due to the increase of the charge-transfer resistance accompanying the gradual blocking of the electrode.…”

Section: Multilayer Characterizationmentioning

confidence: 99%

“…It is important to note that the impedance decreases at any given frequency with increasing n. This behavior is opposite to the one observed in PEMUs, in which impedance always increases with the number of layers. [18][19][20][21][22][23][24][25][26][27][28] The importance of the last layer deposited in the multilayer proves again decisive for this system if we consider now the pLys terminated multilayers (see insets in Figure 11). Although for multilayers with two and four layers the trend in the current is to slightly increase with n (and that of impedance to decrease), this behavior suddenly changes for six layers, in which a jump in the impedance is observed.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Electrochemical Characterization of Polyelectrolyte/Gold Nanoparticle Multilayers Self-Assembled on Gold Electrodes

et al. 2005

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Polyelectrolyte/gold nanoparticle multilayers composed of poly(L-lysine) (pLys) and mercaptosuccinic acid (MSA) stabilized gold nanoparticles (Au NPs) were built up using the electrostatic layer-by-layer self-assembly technique upon a gold electrode modified with a first layer of MSA. The assemblies were characterized using UV-vis absorption spectroscopy, cyclic and square-wave voltammetry, electrochemical impedance spectroscopy, and atomic force microscopy. Charge transport through the multilayer was studied experimentally as well as theoretically by using two different redox pairs [Fe(CN) 6 ] 3-/4-and [Ru(NH 3 ) 6 ] 3+/2+ . This paper reports a large sensitivity to the charge of the outermost layer for the permeability of these assemblies to the probe ions. With the former redox pair, dramatic changes in the impedance response were obtained for thin multilayers each time a new layer was deposited. In the latter case, the multilayer behaves as a conductor exhibiting a strikingly lower impedance response, the electric current being enhanced as more layers are added for Au NP terminated multilayers. These results are interpreted quite satisfactorily by means of a capillary membrane model that encompasses the wide variety of behaviors observed. It is concluded that nonlinear slow diffusion through defects (pinholes) in the multilayer is the governing mechanism for the [Fe(CN) 6 ] 3-/4-species, whereas electron transfer through the Au NPs is the dominant mechanism in the case of the [Ru(NH 3 ) 6 ] 3+/2+ pair.

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Electrochemistry at ultrathin polyelectrolyte films self-assembled at planar gold electrodes

Cited by 66 publications

References 23 publications

Electrochemical Characterization of a Self-Assembled Polyelectrolyte Film

Electrochemical Characterization of a Self-Assembled Polyelectrolyte Film

Deposition Mechanisms in Layer-by-Layer or Step-by-Step Deposition Methods: From Elastic and Impermeable Films to Soft Membranes with Ion Exchange Properties

Electrochemical Characterization of Polyelectrolyte/Gold Nanoparticle Multilayers Self-Assembled on Gold Electrodes

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