Clay-mesoporous silica composite films generated by electro-assisted self-assembly

Maghear, Adela; Etienne, Mathieu; Tertiş, Mihaela; Săndulescu, Robert; Walcarius, Alain

doi:10.1016/j.electacta.2013.08.119

Cited by 22 publications

(23 citation statements)

References 69 publications

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“…Moreover, Langmuir-Blodgett method was applied to prepare thin film on electrode surfaces but is limited till now to unmodified clay minerals [141][142][143]. Recently, the electroassisted generation of clay-mesoporous silica composite films onto glassy carbon electrodes was reported [144]. The method involved the deposition of clay particles by spin coating on glassy carbon electrode (GCE) and the subsequent growth of a surfactant-templated silica matrix around these particles by electro-assisted self-assembly.…”

Section: Film-coated Electrodesmentioning

confidence: 99%

“…to redox probes) and the clay recovered its pristine interlayer distance and cation exchange properties. The organoclay obtained, shown to be prominent electrode modifier, was applied in the preconcentration electroanalysis of copper(II) [144]. Some years before that relevant work, the same concept of sol-gel process (but without the electro-assisted step) was exploited for the elaboration of thiol functionalized (using MPTMS/TEOS) porous clay heterostructures (PCHs) that were used as sensing devices for Hg(II) upon coating on GCEs [131,132].…”

Section: Current [Mp] / μMmentioning

confidence: 99%

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Organoclay-modified electrodes: preparation, characterization and recent electroanalytical applications

Tonlé

Ngameni

Tchieno

et al. 2015

J Solid State Electrochem

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Amperometric sensors dedicated to the determination of pollutants and other compounds of interest face daily a great challenge: the development of sensitive, reproducible and low-cost devices allowing fast analyses. This review deals with the beneficial role and application of organoclays exploited as sensing materials in various fields of electroanalysis, for the past 15 years (period 2000-2014). After a description of different preparation methods leading to clay minerals chemically modified by organic compounds, the common methods used for their characterization are exposed; then, their application as electrode modifiers is described, covering several approaches that were developed to enhance either the sensitivity or the selectivity of the indexed organoclay-based sensors. Finally, a brief description of voltammetric methods frequently used for electroanalytical purposes is given, followed by an update of recent and salient results achieved for the detection of inorganic and organic electroactive compounds or ions.

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Section: Film-coated Electrodesmentioning

confidence: 99%

Section: Current [Mp] / μMmentioning

confidence: 99%

Organoclay-modified electrodes: preparation, characterization and recent electroanalytical applications

Tonlé

Ngameni

Tchieno

et al. 2015

J Solid State Electrochem

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“…The use of clay to modify carbon paste electrodes (CCPEs) is a current research area in electroanalysis [16]. In recent reviews, Walcarius et al have demonstrated a high sensitivity of this type of electrodes attributed to a better preconcentration efficiency, a high accessibility to binding sites and faster diffusion processes [17,18].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical determination of paraquat in potato, lemon, orange and natural water samples using sensitive-rich clay carbon electrode

Kasmi¹,

Lahrich

Farahi

et al. 2016

Journal of the Taiwan Institute of Chemical Engineers

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“…The same authors published two articles in which they showed that it is possible to deposit zirconia [2] and titania [3] films. Since then, the electro-assisted deposition has been used to produce nanocomposites [4][5][6], anticorrosion protective layers [7][8][9][10][11][12][13][14][15][16] and mesoporous silica [17][18][19][20]. More recently, an interesting application of the mechanism of electrodeposition has been exploited: the formation of patterns using the scanning electrochemical microscopy (SECM) to locally increase the electron concentration and therefore the electro-generation of hydroxide ions [21].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical deposition of silica sol–gel films on stainless steel: preliminary analysis of key variables

Giordano

Durante

Gennaro

et al. 2015

J Sol-Gel Sci Technol

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The sol-gel electrodeposition of coatings on conductive substrates has been presented the first time in 1999, and since then, a significant number of papers have been published, mainly devoted to explore the possibilities of application. However, a clear and complete picture of the fundamental aspects and of the role of the many parameters involved is still lacking. In this work, which is intended to be a preliminary approach to a systematic study, the effect of potential and time on the coating thickness was studied, trying to analyze the different factors that make experimentation difficult, looking for possible solutions and putting the basis for a more complete and analytic investigation. Simple tetraethyl orthosilicatebased acidic solutions were used to coat planar stainless steel samples. Different starting solutions were tested, varying the amount of precursor, water and hydrochloric acid. The role of working temperature, oxygen concentration and the presence of potassium nitrate until saturation was tested. Morphology, thickness, cyclic voltammetry and chronoamperometry were used to characterize the coatings and to monitor the current in function of potential and time. The thickness was found to increase with both the concentration of the solution and the HCl/TEOS ratio. Temperature was found to be an important factor, but also the amount of oxygen and electrolyte (KNO 3 ) in solution seems to influence the thickness of coatings. Graphical Abstract

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Clay-mesoporous silica composite films generated by electro-assisted self-assembly

Cited by 22 publications

References 69 publications

Organoclay-modified electrodes: preparation, characterization and recent electroanalytical applications

Organoclay-modified electrodes: preparation, characterization and recent electroanalytical applications

Electrochemical determination of paraquat in potato, lemon, orange and natural water samples using sensitive-rich clay carbon electrode

Electrochemical deposition of silica sol–gel films on stainless steel: preliminary analysis of key variables

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