Abstract:Gold (Au) electrodes coated with layer-by-layer (LbL) thin films composed of chitosan (CHI) were prepared to evaluate the redox properties of hexaammine ruthenium ions, Ru(NH3)63+, and ferricyanide ions, Fe(CN)63− LbL films were prepared on an Au electrode by electrostatic LbL deposition using polycationic CHI and poly(vinyl sulfate) (PVS) or poly(acrylic acid) (PAA) as anionic component. Redox peak current in cyclic voltammetry of Ru(NH3)63+ on the CHI/PVS and CHI/PAA film-coated electrodes increased with inc… Show more
“…In our case of rhodamine 6 G, the use of aldehyde compound coating for WO 3 surface functionalization serves these two purposes. It is important to note that the behavior of functional material coated electrode is unique because in this case the results are generally rationalized in terms of the electrostatic interactions between the dissolved species and the functional molecule coated on the electrode, apart from the occurrences of regular oxidation-reduction reactions 73 – 75 . Such an interaction can be attraction or repulsion, depending on the species and solution condition (pH, temperature, range of potential).…”
Section: Discussionmentioning
confidence: 99%
“…Many different reports followed a similar model to explain sensing. Some examples are listed in references 73 – 75 . Figure 9 ( a ) A schematic diagram showing the surface modification (sensitization steps) on WO x nanostructure with methyl thiophene aldehyde for selective detection of the organic dye molecule.…”
Tungsten oxide based micro and nanosized structures possess good capacitance as well as enhanced rate capability. Such properties are useful in various applications including electrochemical supercapacitors. Apart from supercapacitance, WO3 and their 2D integrated structures have been modified using different methods to widen their range of the utility. Modification using layer coating, functionalization with other nanomaterial or molecules are methods that can be used to improve the core structure of WO3. But such modifications often alter electrochemical performance. The effects and outcomes of such modifications incorporated in WO3 structures were studied using electrochemical methods, sensing behavior, and morphological examination. One goal for such modifications was to improve robustness of the WO3 structures apart from any change in supercapacitance performance. After detailed electrochemical analyses of WO3 structures, a preliminary study was performed regarding the feasibility of the WO3 based sensors for food safety applications based on electrochemical detection of hazardous dyes in food. Preliminary results obtained after various electrochemical tests including pulsed voltammetry, cyclic voltammetry, and electrochemical impedance spectroscopy suggest the viability of WO3 structures for food safety applications.
“…In our case of rhodamine 6 G, the use of aldehyde compound coating for WO 3 surface functionalization serves these two purposes. It is important to note that the behavior of functional material coated electrode is unique because in this case the results are generally rationalized in terms of the electrostatic interactions between the dissolved species and the functional molecule coated on the electrode, apart from the occurrences of regular oxidation-reduction reactions 73 – 75 . Such an interaction can be attraction or repulsion, depending on the species and solution condition (pH, temperature, range of potential).…”
Section: Discussionmentioning
confidence: 99%
“…Many different reports followed a similar model to explain sensing. Some examples are listed in references 73 – 75 . Figure 9 ( a ) A schematic diagram showing the surface modification (sensitization steps) on WO x nanostructure with methyl thiophene aldehyde for selective detection of the organic dye molecule.…”
Tungsten oxide based micro and nanosized structures possess good capacitance as well as enhanced rate capability. Such properties are useful in various applications including electrochemical supercapacitors. Apart from supercapacitance, WO3 and their 2D integrated structures have been modified using different methods to widen their range of the utility. Modification using layer coating, functionalization with other nanomaterial or molecules are methods that can be used to improve the core structure of WO3. But such modifications often alter electrochemical performance. The effects and outcomes of such modifications incorporated in WO3 structures were studied using electrochemical methods, sensing behavior, and morphological examination. One goal for such modifications was to improve robustness of the WO3 structures apart from any change in supercapacitance performance. After detailed electrochemical analyses of WO3 structures, a preliminary study was performed regarding the feasibility of the WO3 based sensors for food safety applications based on electrochemical detection of hazardous dyes in food. Preliminary results obtained after various electrochemical tests including pulsed voltammetry, cyclic voltammetry, and electrochemical impedance spectroscopy suggest the viability of WO3 structures for food safety applications.
“…For example, embedding proteins in PE films has led to simple methods for electronically wiring the protein to an underlying electrode for efficient electron transfer. This has led to the development of biosensors, ,− enzyme fuel cells, , and the ability to conduct a fundamental study on the charge transport mechanisms by directly coupling the protein to an electrode (i.e., protein voltammetry). − Embedding metallic nanoparticles to facilitate electron transport in ion-conducting PE films has led to variety of electrochemical sensors, − electrocatalytic films, and electronic devices. − …”
Electrochemical deposition of cationic and anionic polyelectrolyte on a Au electrode is studied as a function of applied potential between the electrode and the solution of monovalent electrolyte. The deposition is measured by open circuit potential relative to a pristine electrode in a reference solution (100 mM NaCl). The rate of deposition is measured by a home-built electrochemical-optical method in real time. It was discovered that the polarity of the potential and magnitude of the potential are not the primary reasons to enhance deposition. For example, both the amount and rate of deposition of negatively charged poly-(styrenesulfonate) in NaCl are higher when the electrode is at −200 mV than at +200 mV with respect to the solution. The results are explained in terms of the charge state of the electrical double layer that is primarily controlled by supporting (small) ions.
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