CdS quantum dots as a scattering nanomaterial of carbon nanotubes in polymeric nanocomposite sensors for microelectrode array behavior

This work is focused on evaluating the direct electrochemical effect of semi-conducting nanocrystals when they are integrated in bulky nanocomposite sensors based on multiwalled carbon nanotubes (MWCNTs). For this aim, MWCNTs have successfully been functionalized with CdS quantum dots (CdS–QDs@MWCNT...

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Bibliographic Details
Published in:Journal of materials science 2016-02, Vol.51 (3), p.1610-1619
Main Authors: Muñoz, J, Bastos-Arrieta, Julio, Muñoz, Maria, Muraviev, Dmitri, Céspedes, Francisco, Baeza, M
Format: Article
Language:English
Subjects:
Ascorbic acid
Cadmium sulfide
Cadmium sulfides
capacitance
carbon nanotubes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Dispersion
Electrical measurement
Electrochemical analysis
electrochemistry
Enginyeria química
epoxides
Epoxy resins
Feasibility studies
Hydrogen peroxide
Low concentrations
Materials Science
Microelectrodes
Multi wall carbon nanotubes
Nanocomposites
Nanocrystals
Nanomaterials
Nanotubes
Nanotubs
Original Paper
Parameter modification
polymer nanocomposites
Polymer Sciences
Quantum dots
Semiconductors
Sensitivity analysis
Sensor arrays
Sensors
Solid Mechanics
Àrees temàtiques de la UPC
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Summary:This work is focused on evaluating the direct electrochemical effect of semi-conducting nanocrystals when they are integrated in bulky nanocomposite sensors based on multiwalled carbon nanotubes (MWCNTs). For this aim, MWCNTs have successfully been functionalized with CdS quantum dots (CdS–QDs@MWCNTs) and then dispersed within an insulating polymeric matrix, as epoxy resin, for electroanalytical sensing purposes. After an accurate voltammetric and impedimetric characterization, some electrochemical parameters were surprisingly enhanced regarding the non-modified sensors, such as peak current height, electroactive area, and emphasizing the double-layer capacitance. These results can be explained since CdS–QDs confer to the nanocomposite sensor a microelectrode array behavior, dispersing the conductive microzones through the polymeric matrix, as revealed by morphological experiments. The feasibility of this approach was amperometrically evaluated for ascorbic acid and hydrogen peroxide, both used as reference analytes. Electroanalytical results demonstrated that this approach provides to the CdS–QDs-modified nanocomposite sensors the capability to determine low concentrations of analytes and improved sensitivities.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-9484-0