Hybrid layer-by-layer (LbL) films of polyaniline, graphene oxide and zinc oxide to detect ammonia

André, Rafaela S.; Shimizu, Flávio M.; Miyazaki, Celina M.; Riul, Antonio; Manzani, Danilo; Ribeiro, Sidney J. L.; Oliveira, Osvaldo N.; Mattoso, Luiz H. C.; Corrêa, Daniel S.

doi:10.1016/j.snb.2016.07.099

Cited by 85 publications

(24 citation statements)

References 64 publications

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“…The advent of nanotechnology has promoted a new frontier in materials science research with huge possibilities of technological applications owing to the control of molecular chemistry and materials at nanoscale. For instance, graphene oxide (GO) and their nanocomposites are remarkable nanomaterials with appealing mechanical, thermal, and electrical properties, allowing them to be applied in optical and electronic devices and sensors . Considering the use of graphene‐based nanocomposites in biological applications, especially for cellular uptake and artificial organs, the understanding of their interaction with living systems, with possible implications in toxicity and tissue engineering studies, becomes relevant.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of random and aligned electrospun nanofibers containing graphene oxide for skeletal muscle cells scaffold

Uehara

Paino

Santos

et al. 2020

Polymers for Advanced Techs

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Graphene oxide (GO)-based materials have been explored in biomedical applications as active engineered materials for diagnosis and therapy. Although a large number of studies have been carried out in the last years, aspects involving the orientation and elongation of cells on GO immobilized on polymeric nanofibers are still scarce. We investigated the interactions between skeletal muscle cells and GO immobilized on random and aligned electrospun nanofibers of poly(caprolactone) (PCL), a biocompat-

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Section: Introductionmentioning

confidence: 99%

Fabrication of random and aligned electrospun nanofibers containing graphene oxide for skeletal muscle cells scaffold

Uehara

Paino

Santos

et al. 2020

Polymers for Advanced Techs

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“…Owing to their high specific surface area and excellent electrocatalytic properties, nanomaterials such as graphene or metallic nanoparticles have been widely used to improve the performance of biosensors dedicated to the detection of phenols [6][7][8][9][10]. Other electrocatalysts, such as conducting polymers [11,12], porphyrins [13,14] or phthalocyanines [15][16][17], have also been successfully incorporated into LbL films as electrocatalytic materials in electrochemical biosensors. On the other hand, LbL films are ideal structures to incorporate linkers able to capture the enzymatic probes.…”

Section: Introductionmentioning

confidence: 99%

Biosensors Platform Based on Chitosan/AuNPs/Phthalocyanine Composite Films for the Electrochemical Detection of Catechol. The Role of the Surface Structure

Salvo-Comino

González-Gil

Rodriguez-Valentin

et al. 2020

Sensors

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Biosensor platforms consisting of layer by layer films combining materials with different functionalities have been developed and used to obtain improved catechol biosensors. Tyrosinase (Tyr) or laccase (Lac) were deposited onto LbL films formed by layers of a cationic linker (chitosan, CHI) alternating with layers of anionic electrocatalytic materials (sulfonated copper phthalocyanine, CuPcS or gold nanoparticles, AuNP). Films with different layer structures were successfully formed. Characterization of surface roughness and porosity was carried out using AFM. Electrochemical responses towards catechol showed that the LbL composites efficiently improved the electron transfer path between Tyr or Lac and the electrode surface, producing an increase in the intensity over the response in the absence of the LbL platform. LbL structures with higher roughness and pore size facilitated the diffusion of catechol, resulting in lower LODs. The [(CHI)-(AuNP)-(CHI)-(CuPcS)]2-Tyr showed an LOD of 8.55∙10−4 μM, which was one order of magnitude lower than the 9.55·10−3 µM obtained with [(CHI)-(CuPcS)-(CHI)-(AuNP)]2-Tyr, and two orders of magnitude lower than the obtained with other nanostructured platforms. It can be concluded that the combination of adequate materials with complementary activity and the control of the structure of the platform is an excellent strategy to obtain biosensors with improved performances.

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“…The incorporation of AuNPs in LbL structures composed by emeraldine salt polyaniline (PANi-ES) and sodium montmorillonite clay mineral (Na + MMT) enhanced the electrocatalytic response of the sensors to heavy metal ions, achieving a lower detection limit (from mgL −1 to μgL −1 ). Also in 2017 Andre et al tested hybrid LbL films as gas sensor to detect ammonia (NH 3 ) in hazardous pollutant monitoring [10]. LbL films composed by polyaniline (PANi), graphene oxide (GO), and zinc oxide (ZnO) were combined in a tetralayered structure (PANi/GO/PANi/ZnO) onto gold interdigitated electrodes (IDEs).…”

Section: Introductionmentioning

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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Hybrid layer-by-layer (LbL) films of polyaniline, graphene oxide and zinc oxide to detect ammonia

Cited by 85 publications

References 64 publications

Fabrication of random and aligned electrospun nanofibers containing graphene oxide for skeletal muscle cells scaffold

Fabrication of random and aligned electrospun nanofibers containing graphene oxide for skeletal muscle cells scaffold

Biosensors Platform Based on Chitosan/AuNPs/Phthalocyanine Composite Films for the Electrochemical Detection of Catechol. The Role of the Surface Structure

Multilayered Nanostructures Integrated with Emerging Technologies

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