Electronic Tongue Based on Nanostructured Hybrid Films of Gold Nanoparticles and Phthalocyanines for Milk Analysis

Mercante, Luiza A.; Scagion, Vanessa P.; Pavinatto, Adriana; Sanfelice, Rafaela C.; Mattoso, Luiz H. C.; Corrêa, Daniel S.

doi:10.1155/2015/890637

Cited by 30 publications

(20 citation statements)

References 26 publications

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“…This multi-dimensional data extraction allows efficient discrimination between trace amounts of different analytes, even in minute quantities. Tuning the impedance of the active layer by controlling the metal loading through NP incorporation is expected to significantly enhance both sensitivity and selectivity of such devices [14], as already demonstrated for an LbL system [15]. The underlying mechanisms remain, however, unclear and the study of systems with controlled architecture is needed.…”

Section: Monitoring the Dispersion And Agglomeration Of Silver Nanopamentioning

confidence: 95%

Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

Hensel

Moreira

Riul

et al. 2020

Applied Physics Letters

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The ability to disperse metallic nano-objects in a given matrix material is an important issue for the design and fabrication of functional materials. A means to monitor the spatial distribution of the nano-dopants is highly desirable but often possible only a posteriori and with destructive techniques. Here we present a spectroscopic characterization based on different plasmonic responses of silver nanoparticles, their agglomerates, and finally the percolated silver film. We demonstrate its usefulness for the specific case of their dispersion in layer-by-layer polymeric films but the method is extendable to any other host material transparent in the visible/near UV range. Individual silver nanoparticles display the well-known localized surface plasmon resonance around 400 nm, which is red-shifted upon inter-particle coupling. The transition regime between weakly coupled particles and fully percolated metal films is, however, much harder to evidence unambiguously. We show here how to monitor this transition using the so-called Ferrell plasmon, a plasmonic mode of the thin film in the mid-UV, and excitable only under oblique irradiation but without specific coupling precautions. We can thus follow the entire transition from isolated to coupled and finally to fully agglomerated nanoparticles by optical spectroscopy.

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Section: Monitoring the Dispersion And Agglomeration Of Silver Nanopamentioning

confidence: 95%

Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

Hensel

Moreira

Riul

et al. 2020

Applied Physics Letters

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“…As an example, the incorporation of gold nanoparticles into LbL films composed by PANi and Na + MMT enabled the electrochemical detection of trace levels of cadmium, lead, and copper ions [9]. The inclusion of gold nanoparticles increased also the discrimination between skimmed, semiskimmed, and full-fat milk samples [58]. Although the deposition of nanoparticles between layers in LbL structures might increase both sensitivity and selectivity [9,58], it is not possible to control an adequate dispersion of them during the spontaneous adsorption process.…”

Section: Incorporation Of Nanoparticles By Physical Methodsmentioning

confidence: 99%

“…The inclusion of gold nanoparticles increased also the discrimination between skimmed, semiskimmed, and full-fat milk samples [58]. Although the deposition of nanoparticles between layers in LbL structures might increase both sensitivity and selectivity [9,58], it is not possible to control an adequate dispersion of them during the spontaneous adsorption process. Consequently, it precludes a better comprehension of the influence of nanoparticles on enhanced sensitivity and selectivity.…”

Section: Incorporation Of Nanoparticles By Physical Methodsmentioning

confidence: 99%

Multilayered Nanostructures Integrated with Emerging Technologies

Braunger¹,

Hensel²,

Gaál³

et al. 2020

Multilayer Thin Films - Versatile Applications for Materials Engineering

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Surface and interface functionalization are crucial steps to introduce new functionalities in numerous applications, as faster dynamics occur on surfaces rather than bulk. Within this context, the layer-by-layer (LbL) technique is a versatile methodology to controllably form organized nanostructures from the spontaneous adsorption of charged molecules. It enables the assembly of multilayered LbL films on virtually any surface using non-covalent molecular interactions, allowing the nanoengineering of interfaces and creation of multifunctional systems with distinct building blocks (polymers, clays, metal nanoparticles, enzymes, organic macromolecules, etc.). Several applications require thin films on electrodes for sensing/ biosensing, and here we explore LbL films deposited on interdigitated electrodes (IDEs) that were 3D-printed using the fusing deposition modeling (FDM) technique. IDEs covered with LbL films can be used to form multisensory systems employed in the analysis of complex liquids transforming raw data into specific patterns easily recognized by computational and statistical methods. We extend the FDM 3D-printing methodology to simplify the manufacturing of electrodes and microchannels, thus integrating an e-tongue system in a microfluidic device. Moreover, the continuous flow within microchannels contributes to faster and more accurate analysis, reducing the amount of sample, waste, and costs.

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“…E-tongues based on different types of sensors have been used to analyze the quality of milks [ 26 , 27 ] to monitor changes in quality during storage [ 28 , 29 ], to classify fermented milks [ 30 ], and to detect adulterations [ 31 ] or off-flavors in the raw milk [ 32 ]. Usually e-tongue systems provide global information about the samples and are used for classification purposes using principal component analysis (PCA).…”

Section: Introductionmentioning

confidence: 99%

Discrimination of Milks with a Multisensor System Based on Layer-by-Layer Films

Salvo-Comino

García-Hernández

Garcı́a

et al. 2018

Sensors

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A nanostructured electrochemical bi-sensor system for the analysis of milks has been developed using the layer-by-layer technique. The non-enzymatic sensor [CHI+IL/CuPcS]2, is a layered material containing a negative film of the anionic sulfonated copper phthalocyanine (CuPcS) acting as electrocatalytic material, and a cationic layer containing a mixture of an ionic liquid (IL) (1-butyl-3-methylimidazolium tetrafluoroborate) that enhances the conductivity, and chitosan (CHI), that facilitates the enzyme immobilization. The biosensor ([CHI+IL/CuPcS]2-GAO) results from the immobilization of galactose oxidase on the top of the LbL layers. FTIR, UV–vis, and AFM have confirmed the proposed structure and cyclic voltammetry has demonstrated the amplification caused by the combination of materials in the film. Sensors have been combined to form an electronic tongue for milk analysis. Principal component analysis has revealed the ability of the sensor system to discriminate between milk samples with different lactose content. Using a PLS-1 calibration models, correlations have been found between the voltammetric signals and chemical parameters measured by classical methods. PLS-1 models provide excellent correlations with lactose content. Additional information about other components, such as fats, proteins, and acidity, can also be obtained. The method developed is simple, and the short response time permits its use in assaying milk samples online.

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Electronic Tongue Based on Nanostructured Hybrid Films of Gold Nanoparticles and Phthalocyanines for Milk Analysis

Cited by 30 publications

References 26 publications

Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

Multilayered Nanostructures Integrated with Emerging Technologies

Discrimination of Milks with a Multisensor System Based on Layer-by-Layer Films

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