Studies on Electrochemical Behavior of Bromideat a Chitosan-Modified Glassy Carbon Electrode

Yao, Xin; Lu, Guoqiang; Wu, Xiaogang; Zhan, Tong

doi:10.1002/1521-4109(200107)13:11<923::aid-elan923>3.0.co;2-p

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…Most of the applications of chitosan are based on the polyelectrolytic nature and chelating ability of the amine group of the macromolecules, and such properties are mainly governed by the acidity of the ÀNH þ 3 group [131]. The weak-base anion-exchange ability of pure chitosan has been applied in the development of surface-modified sensors for anion detection, based on the casting of chitosan films onto the surface of glassy carbon electrodes [132,133]. Nevertheless, these devices lack of long-term stability properly because of alteration of the characteristics of chitosan films.…”

Section: Chitosan and Its Nanocompositesmentioning

confidence: 99%

Biodegradable polymers and their layered silicate nanocomposites: In greening the 21st century materials world

Ray¹,

Bousmina²

2005

Progress in Materials Science

1,412

185

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Section: Chitosan and Its Nanocompositesmentioning

confidence: 99%

Biodegradable polymers and their layered silicate nanocomposites: In greening the 21st century materials world

Ray¹,

Bousmina²

2005

Progress in Materials Science

1,412

185

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“…The utilisation of carbon materials for applications within electroanalytical sensors have become a major factor over recent decades, as researchers strive to find cheap and effective electrochemical systems that possess the capabilities for the simplistic retrieval of analytical data. Modification of electrode surfaces has been a method commonly utilised [1][2][3][4] with materials such as graphene, 5 carbon nanotubes, 6 metal phthalocyanines, 7 chitosan, 8,9 enzymatic materials, 10 metallic nanoparticles 11,12 to name a just a few, with the aim of improving electroanalytical sensitivity's compared to their bare unmodified counterparts.…”

Section: Introductionmentioning

confidence: 99%

Can solvent induced surface modifications applied to screen-printed platforms enhance their electroanalytical performance?

Blanco

Foster

Cumba

et al. 2016

Analyst

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In this paper the effect of solvent induced chemical surface enhancements upon graphitic screen-printed electrodes (SPEs) is explored. Previous literature has indicated that treating the working electrode of a SPE with the solvent N,N-dimethylformamide (DMF) offers improvements within the electroanalytical response, resulting in a 57-fold increment in the electrode surface area compared to their unmodified counterparts. The protocol involves two steps: (i) the SPE is placed into DMF for a selected time, and (ii) it is cured in an oven at a selected time and temperature. Beneficial electroanalytical outputs are reported to be due to the increased surface area attributed to the binder within the bulk surface of the SPEs dissolving out during the immersion step (step i). We revisit this exciting concept and explore these solvent induced chemical surface enhancements using edge- and basal-plane like SPEs and a new bespoke SPE, utilising the solvent DMF and explore, in detail, the parameters utilised in steps (i) and (ii). The electrochemical performance following steps (i) and (ii) is evaluated using the outer-sphere redox probe hexaammineruthenium(iii) chloride/0.1 M KCl, where it is found that the largest improvement is obtained using DMF with an immersion time of 10 minutes and a curing time of 30 minutes at 100 °C. Solvent induced chemical surface enhancement upon the electrochemical performance of SPEs is also benchmarked in terms of their electroanalytical sensing of NADH (dihydronicotinamide adenine dinucleotide reduced form) and capsaicin both of which are compared to their unmodified SPE counterparts. In both cases, it is apparent that a marginal improvement in the electroanalytical sensitivity (i.e. gradient of calibration plots) of 1.08-fold and 1.38-fold are found respectively. Returning to the original exciting concept, interestingly it was found that when a poor experimental technique was employed, only then significant increases within the working electrode area are evident. In this case, the insulating layer that defines the working electrode surface, which was not protected from the solvent (step (i)) creates cracks within the insulating layer exposing the underlying carbon connections and thus increasing the electrode area by an unknown quantity. We infer that the origin of the response reported within the literature, where an extreme increase in the electrochemical surface area (57-fold) was reported, is unlikely to be solely due to the binder dissolving but rather poor experimental control over step (i).

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“…Most of the applications of chitosan are based on the polyelectrolytic nature and chelating ability of the amine group of the macromolecules, and such properties are mainly governed by the acidity of the −NH 3 + group (p K a = 6.3) . The weak-base anion-exchange ability of pure chitosan has been applied in the development of surface-modified sensors for anion detection, based on the casting of chitosan films onto the surface of glassy carbon electrodes. , Nevertheless, these devices lack of long-term stability probably because of alteration of the characteristics of chitosan films. An appreciable increase in the stability of chitosan films has been obtained by coverage with organosilicic layers generated by sol−gel procedures .…”

Section: Introductionmentioning

confidence: 99%

Biopolymer−Clay Nanocomposites Based on Chitosan Intercalated in Montmorillonite

2003

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The objective of this work is the intercalation of the cationic biopolymer chitosan in Na +montmorillonite, providing compact and robust three-dimensional nanocomposites with interesting functional properties. CHN chemical analysis, X-ray diffraction, Fourier transform infrared spectroscopy, scanning transmission electron microscopy, energy-dispersion X-ray analysis, and thermal analysis have been employed in the characterization of the nanocomposites, confirming the adsorption in mono-or bilayers of chitosan chains depending on the relative amount of chitosan with respect to the cationic exchange capacity of the clay. The first chitosan layer is adsorbed through a cationic exchange procedure, while the second layer is adsorbed in the acetate salt form. Because the deintercalation of the biopolymer is very difficult, the -NH 3 + Acspecies belonging to the chitosan second layer act as anionic exchange sites and, in this way, such nanocomposites become suitable systems for the detection of anions. These materials have been successfully used in the development of bulkmodified electrodes exhibiting numerous advantages as easy surface renewal, ruggedness, and long-time stability. The resulting sensors are applied in the potentiometric determination of several anions, showing a higher selectivity toward monovalent anions. This selectivity behavior could be explained by the special arrangement of the polymer as a nanostructured bidimensional system.

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Studies on Electrochemical Behavior of Bromideat a Chitosan-Modified Glassy Carbon Electrode

Cited by 24 publications

References 16 publications

Biodegradable polymers and their layered silicate nanocomposites: In greening the 21st century materials world

Biodegradable polymers and their layered silicate nanocomposites: In greening the 21st century materials world

Can solvent induced surface modifications applied to screen-printed platforms enhance their electroanalytical performance?

Biopolymer−Clay Nanocomposites Based on Chitosan Intercalated in Montmorillonite

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