Nanocomposites based on LbL films of polyaniline and sodium montmorillonite clay

Barros, Anerise de; Ferreira, M.; Constantino, Carlos J. L.; Ferreira, Marystela

doi:10.1016/j.synthmet.2014.09.001

Cited by 22 publications

(23 citation statements)

References 40 publications

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“…Specifically speaking, Fig. 4A depicts the optical micrography of (PEI/Na + MMT) 5 film on silicon substrate showing large clay aggregates, which was characterized by Raman spectrum dominated by Si signal, as expected for clay samples (low Raman scattering cross section) [30]. On the other hand, NiTsPc signal dominates the Raman spectrum when recorded with 632.8 nm laser line, which is the case in Fig.…”

Section: Layer-by-layer Films Characterizationsupporting

confidence: 52%

“…For the quadri-layer architecture of (PEI/Na + MMT/PEI/NiTsPc) 10 (Fig. 3C), the spectrum exhibits the superposition of 3360 and 3426 cm −1 (symmetric and asymmetric stretching N H from PEI) bands and a shoulder at 3621 cm −1 from clay (Si OH stretching) [30]. Clay bands at 467 and 525 cm −1 (Si O and Al O deformations) demonstrated a shift to lower energies (464 and 522 cm −1 ), indicating that these polar groups can be involved in the interaction with the equally polar amine groups from PEI, which has red shifted from N H bending (from 1580 to 1543 cm −1 ).…”

Section: Layer-by-layer Films Characterizationmentioning

confidence: 99%

“…The sulfonated groups are electron-withdrawing groups, that can decrease the electron density on the metal centre, which facilitates the oxidation of the Ni when compared to the non-substituted NiPc [25] and also, allow the solubility in water [24] for layer-by-layer film fabrication [26]. Montmorillonite clay has received attention for technological applications in the last years [27][28][29][30][31] because its adsorption properties [32]. Its crystalline structure is formed by lamellar structures, which consist in three sheets: two silica tetrahedral and one alumina octahedral structures [31].…”

Section: Introductionmentioning

confidence: 99%

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Layer-by-layer composite film of nickel phthalocyanine and montmorillonite clay for synergistic effect on electrochemical detection of dopamine

Lucena

Miyazaki

Shimizu

et al. 2018

Applied Surface Science

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a b s t r a c t Dopamine (DA) abnormal levels are related to diseases which makes important the development of fast, reliable, low-cost and sensitive devices for diagnosis and pharmaceutical controls. Nanostructured film composite of sodium montmorillonite clay (Na + MMT) and nickel phthalocyanine (NiTsPc) was selfassembled by layer-by-layer (LbL) technique and applied as electrochemical sensor for DA in the presence of common natural interferents as ascorbic acid (AA) and uric acid (UA). Three different LbL architecture films were investigated: LbL films of clay (PEI/Na + MMT) and phthalocyanine (PEI/NiTsPc) in a bilayer structure with a conventional polyelectrolyte (PEI) and a composite film formed by both materials to verify the synergistic effect in the LbL film in a quadri-layer assembly (PEI/Na + MMT/PEI/NiTsPc). Structural characterization indicated molecular level interactions between the layers forming the LbL films. The ITO/(PEI/Na + MMT/PEI/NiTsPc) 10 electrode exhibited a LOD of 1.0 mol L −1 and linear range 5-150 mol L −1 .

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Section: Layer-by-layer Films Characterizationsupporting

confidence: 52%

Section: Layer-by-layer Films Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Layer-by-layer composite film of nickel phthalocyanine and montmorillonite clay for synergistic effect on electrochemical detection of dopamine

Lucena

Miyazaki

Shimizu

et al. 2018

Applied Surface Science

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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].…”

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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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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“…Because this type of influence of AuNPs, here we studied the nanostructuring these materials from the LbL technique, where independently of different ordering we observed through LB and LbL techniques it is possible obtain the molecular interaction lows limit of detection is achieved. Most importantly, the incorporation of AuNPs indeed improved the performance of sensing devices in detecting trace levels of cadmium (Cd 2+ ), lead (Pb 2+ ) and copper (Cu 2+ ) ions, when compared with the sensing devices of PAni-ES and Na + -MMT without AuNPs [23].…”

Section: Introductionmentioning

confidence: 99%

High performance of electrochemical sensors based on LbL films of gold nanoparticles, polyaniline and sodium montmorillonite clay mineral for simultaneous detection of metal ions

Barros¹,

Constantino²,

Cruz³

et al. 2017

Electrochimica Acta

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We report the effects of the incorporation of gold nanoparticles (AuNPs) into LbL films of emeraldine salt polyaniline (PAni-ES) and sodium montmorillonite clay mineral (Na +-MMT). We observed the higher performance of electrochemical sensors was induced by AuNPs towards trace level detection of cadmium (Cd 2+), lead (Pb 2+) and copper (Cu 2+) ions. The detection was performed by square wave anodic stripping voltammetry (SWASV) using ITO electrodes modified with LbL films composed of three supramolecular architectures: PAni-ES/AuNPs, AuNPs/Na +-MMT and PAni-ES/AuNPs/Na +-MMT, which were compared to the LbL films without AuNPs. The results are consistent with the AFM dates indicating that the increase of roughness favors at low limit of detection for the sensors. The incorporation of AuNPs and PAni-ES leads to an interaction via ion-dipole, as characterized by FTIR and Raman spectra. This interaction, consequently, causes a more extended polymer chain, which intercalate into Na +-MMT galleries, according to X-ray diffraction data. The results demonstrate the possible control of film properties by exploiting molecular-level interactions in multicomponent nanostructured films favoring directly in electrochemical sensors response.

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Nanocomposites based on LbL films of polyaniline and sodium montmorillonite clay

Cited by 22 publications

References 40 publications

Layer-by-layer composite film of nickel phthalocyanine and montmorillonite clay for synergistic effect on electrochemical detection of dopamine

Layer-by-layer composite film of nickel phthalocyanine and montmorillonite clay for synergistic effect on electrochemical detection of dopamine

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

High performance of electrochemical sensors based on LbL films of gold nanoparticles, polyaniline and sodium montmorillonite clay mineral for simultaneous detection of metal ions

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