Synergistic electrocatalytic effect of nanostructured mixed films formed by functionalised gold nanoparticles and bisphthalocyanines

Medina-Plaza, Cristina; Furini, Leonardo N.; Constantino, Carlos J. L.; Saja, J.A. de; Rodrı́guez-Méndez, M.L.

doi:10.1016/j.aca.2014.08.049

Cited by 25 publications

(35 citation statements)

References 39 publications

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“…The combination of two or more materials in a single device structure has become popular since synergy may be achieved in the materials properties, particularly when they are assembled in nanostructures [1][2][3][4][5]. In a number of applications, metallic nanoparticles are added to organic molecules to yield hybrids, with assembly via film-fabrication methods that allow for control of the molecular architecture, such as the Layer-by-Layer (LbL) and Langmuir-Blodgett (LB) techniques [6][7][8][9][10]. Gold nanoparticles (AuNPs), in particular, have had their catalytic activity and optical properties exploited in sensors, biosensors and electrochromic devices [8,[10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of AuNPs increased the film catalytic activity. Medina-Plaza et al [6,9] reported the synergistic electrocatalytic effect in sensors made of LB films with co-deposited AuNPs and phthalocyanine, where the coating with LB films led to a shift in reduction potential in the less positive direction, in comparison with the bare ITO electrode. The increased catalytic properties of the electrodes allowed for distinguishing between different dissociated protons of polyprotic acids.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions

Barros

Constantino

Bortoleto

et al. 2016

Sensors and Actuators B: Chemical

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We report on effects from incorporating gold nanoparticles (AuNPs) into Langmuir-Blodgett (LB) films of emeraldine salt polyaniline (PAni-ES) and organophilic montmorillonite clay (OMt). The synergistic electrocatalytic effect induced by AuNPs led to an enhanced performance in detecting trace levels of cadmium (Cd 2+), lead (Pb 2+) and copper (Cu 2+) ions. Detection was carried out using square wave anodic stripping (SWAS) voltammetry using ITO electrodes modified with LB films made with three supramolecular architectures: PAni-ES/AuNPs, OMt/AuNPs and OMt/AuNPs/PAni-ES, and compared to LB films without AuNPs. The incorporation of AuNPs induced secondary doping of PAni-ES, inferred from FTIR, Raman and UV-vis. absorption spectroscopies. The PAni-ES chains probably became more extended and could intercalate into the OMt galleries, causing an increased interlayer spacing according to X-ray diffraction data. These results demonstrate the possible control of film properties by exploiting molecular-level interactions in multicomponent nanostructured films.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions

Barros

Constantino

Bortoleto

et al. 2016

Sensors and Actuators B: Chemical

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“…In addition, some mixtures of electrocatalytic materials such as polyaniline or polypyrrole with graphene can enhance the sensitivity of the sensors while lowering the detection limits [11–13]. …”

Section: Introductionmentioning

confidence: 99%

Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors

García-Hernández¹,

Garcı́a²,

Martín-Pedrosa³

et al. 2016

Beilstein J. Nanotechnol.

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The sensing properties of electrodes chemically modified with PEDOT/PSS towards catechol and hydroquinone sensing have been successfully improved by combining layers of PEDOT/PSS with layers of a secondary electrocatalytic material such as gold nanoparticles (PEDOT/PSS/AuNPs), copper phthalocyanine (PEDOT/PSS/CuPc) or lutetium bisphthalocyanine (PEDOT/PSS/LuPc2). Layered composites exhibit synergistic effects that strongly enhance the electrocatalytic activity as indicated by the increase in intensity and the shift of the redox peaks to lower potentials. A remarkable improvement has been achieved using PEDOT/PSS/LuPc2, which exhibits excellent electrocatalytic activity towards the oxidation of catechol. The kinetic studies demonstrated diffusion-controlled processes at the electrode surfaces. The kinetic parameters such as Tafel slopes and charge transfer coefficient (α) confirm the improved electrocatalytic activity of the layered electron mediators. The peak currents increased linearly with concentration of catechol and hydroquinone over the range of 1.5 × 10−4 to 4.0 × 10−6 mol·L−1 with a limit of detection on the scale of μmol·L−1. The layered composite hybrid systems were also found to be excellent electron mediators in biosensors containing tyrosinase and laccase, and they combine the recognition and biocatalytic properties of biomolecules with the unique catalytic features of composite materials. The observed increase in the intensity of the responses allowed detection limits of 1 × 10−7 mol·L−1 to be attained.

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“…Some examples of capped AuNPs have been successfully used for the detection of phenols [4]. Improvement in performance of electrochemical sensors can be achieved by using combinations of electrocatalytic materials due to synergistic effects [5]. Such synergistic effects can be obtained by bringing together components just by mixing, by means of co-electrodeposition, by self assembling or by other methods such as in Langmuir-Blodgett films.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Electrochemical Sensors by Means of Synergy. Combinations of Gold Nanoparticles and Phthalocyanines

Rodrı́guez-Méndez

Ruiz-Carmuega

Sastre

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Voltammetric sensors chemically modified with combinations of two electrocatalytic materials: tetraoctylammonium bromide capped gold nanoparticles (AuNP NBr ) and a sulphur containing zinc phthalocyanine derivative (ZnPc RS ) are reported. The electrocatalytic effects in the detection of catechol have been analyzed in sensors obtained by direct mixing (AuNP NBr /ZnPc RS ) and in sensors modified with an adduct where both components are linked covalently (AuNP NBr -S-ZnPc R ). Results demonstrate that the nature of the interaction between both components modifies the electrocatalytic properties. The AuNP NBr /ZnPc RS mixture improves the electron transfer rate of the catechol reduction, with limits of detection of 10 −6 M. The covalent adduct AuNP NBr -S-ZnPc R enhances the response rate of the oxidation of the catechol with limits of detection of 10 −7 M.

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Synergistic electrocatalytic effect of nanostructured mixed films formed by functionalised gold nanoparticles and bisphthalocyanines

Cited by 25 publications

References 39 publications

Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions

Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions

Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors

Improving the Performance of Electrochemical Sensors by Means of Synergy. Combinations of Gold Nanoparticles and Phthalocyanines

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