Layer-by-Layer Films of Graphene Nanoplatelets and Gold Nanoparticles for Methyl Parathion Sensing

Rodrigues, Gustavo H. S.; Miyazaki, Celina M.; Rubira, Rafael J. G.; Constantino, Carlos J. L.

doi:10.1021/acsanm.9b00007

Cited by 32 publications

(23 citation statements)

References 77 publications

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“…Additional data are shown in Figures S10 and S11 in the Supplementary Information. The LOD was calculated similarly to recent literature [37][38][39][40][41] as LOD = (3 × σ)/b, where σ is the standard deviation, and b is the slope of the calibration curve (linear fit). Figure 5.…”

Section: Resultsmentioning

confidence: 99%

3D-Printed Graphene Electrodes Applied in an Impedimetric Electronic Tongue for Soil Analysis

et al. 2019

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The increasing world population leads to the growing demand for food production without expanding cultivation areas. In this sense, precision agriculture optimizes the production and input usage by employing sensors to locally monitor plant nutrient within agricultural fields. Here, we have used an electronic tongue sensing device based on impedance spectroscopy to recognize distinct soil samples (sandy and clayey) enriched with macronutrients. The e-tongue setup consisted of an array of four sensing units formed by layer-by-layer (LbL) films deposited onto 3D-printed graphene-based interdigitated electrodes (IDEs). The IDEs were fabricated in 20 min using the fused deposition modeling process and commercial polylactic acid-based graphene filaments. The e-tongue comprised one bare and three IDEs functionalized with poly(diallyldimethylammonium chloride) solution/copper phthalocyanine-3,4 ,4 ,4 -tetrasulfonic acid tetrasodium salt (PDDA/CuTsPc), PDDA/montmorillonite clay (MMt-K), and PDDA/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) LbL films. Control samples of sandy and clayey soils were enriched with different concentrations of nitrogen (N), phosphorus (P), and potassium (K) macronutrients. Sixteen soil samples were simply diluted in water and measured using electrical impedance spectroscopy, with data analyzed by principal component analysis. All soil samples were easily distinguished without pre-treatment, indicating the suitability of 3D-printed electrodes in e-tongue analysis to distinguish the chemical fertility of soil samples. Our results encourage further investigations into the development of new tools to support precision agriculture.

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Section: Resultsmentioning

confidence: 99%

3D-Printed Graphene Electrodes Applied in an Impedimetric Electronic Tongue for Soil Analysis

et al. 2019

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“…The fabrication of LbL films based on the functionalized rGO (graphene) nanopellets and AuNPs for the detection of pesticide-methyl parathion was reported by Rodrigues et al [66]. The used rGO (graphene) nanoplatelets were stabilized in PDDA or PSS to obtain a positive or a negative charge of the rGO, respectively.…”

Section: Multilayer Film Consisting Of Two or More Multilayer Films Me And Meo Nps As A Layermentioning

confidence: 99%

“…authors revealed the potential utilization of these electrodes in microfluidic devices for the determination of various species based on the change in conductivity. The fabrication of LbL films based on the functionalized rGO (graphene) nanopellets and AuNPs for the detection of pesticide-methyl parathion was reported by Rodrigues et al [66]. The used rGO (graphene) nanoplatelets were stabilized in PDDA or PSS to obtain a positive or a negative charge of the rGO, respectively.…”

Section: Carbon-based Nanomaterials As a Layermentioning

confidence: 99%

Polyelectrolytes Assembly: A Powerful Tool for Electrochemical Sensing Application

Rončević

Krivić

Buljac

et al. 2020

Sensors

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The development of sensing coatings, as important sensor elements that integrate functionality, simplicity, chemical stability, and physical stability, has been shown to play a major role in electrochemical sensing system development trends. Simple and versatile assembling procedures and scalability make polyelectrolytes highly convenient for use in electrochemical sensing applications. Polyelectrolytes are mainly used in electrochemical sensor architectures for entrapping (incorporation, immobilization, etc.) various materials into sensing layers. These materials can often increase sensitivity, selectivity, and electronic communications with the electrode substrate, and they can mediate electron transfer between an analyte and transducer. Analytical performance can be significantly improved by the synergistic effect of materials (sensing material, transducer, and mediator) present in these composites. As most reported methods for the preparation of polyelectrolyte-based sensing layers are layer-by-layer and casting/coating methods, this review focuses on the use of the latter methods in the development of electrochemical sensors within the last decade. In contrast to many reviews related to electrochemical sensors that feature polyelectrolytes, this review is focused on architectures of sensing layers and the role of polyelectrolytes in the development of sensing systems. Additionally, the role of polyelectrolytes in the preparation and modification of various nanoparticles, nanoprobes, reporter probes, nanobeads, etc. that are used in electrochemical sensing systems is also reviewed.

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“…Gold nanoparticles (Au NPs) have attracted enormous scientific and technological interest due to their ease of synthesis, chemical stability, unique optical properties, and biocompatibility These unique particles with sizes comparable to those of cellular structures enable the development of more applications such as optical tomography imaging and the use of tracers to detect DNA. , Also, their unique optical properties provide the potential for developing artificial tissues in ophthalmic therapeutic applications due to their unique plasmon effect . However, it is still necessary to study their dispersity in size, shape, and distribution, which result in monodisperse Au NPs in different sizes.…”

Section: Introductionmentioning

confidence: 99%

Model for Gold Nanoparticle Synthesis: Effect of pH and Reaction Time

et al. 2021

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The synthesis of gold nanoparticles is dependent on both the concentration of trisodium citrate dihydrate and the time that it interacts with tetrachloroauric acid. A wide range of gold nanoparticles with various sizes and dispersity can be produced based on control variables, such as time of reaction and acid concentration, using a similar approach to that of the Turkevich model. In this model, the pH of the solution decreases slightly throughout the reaction (0.005 unit/min) due to the chemical interactions between trisodium citrate dihydrate and tetrachloroauric acid. Dicarboxy acetone is formed during citrate oxidization, resulting in gold nuclei formation over time. In addition, gold nanoparticle nucleation causes pH fluctuation over time based on gold nanoparticle sizes. An inverse correlation (coefficient of smaller than −0.97) was calculated between the pH and reaction time at different ratios of trisodium citrate dihydrate to tetrachloroauric acid. Regression analysis was used to develop a model for the prediction of the size of gold nanoparticles ranging from 18 to 38 nm based on the concentration of trisodium citrate dihydrate and the reaction time.

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Layer-by-Layer Films of Graphene Nanoplatelets and Gold Nanoparticles for Methyl Parathion Sensing

Cited by 32 publications

References 77 publications

3D-Printed Graphene Electrodes Applied in an Impedimetric Electronic Tongue for Soil Analysis

3D-Printed Graphene Electrodes Applied in an Impedimetric Electronic Tongue for Soil Analysis

Polyelectrolytes Assembly: A Powerful Tool for Electrochemical Sensing Application

Model for Gold Nanoparticle Synthesis: Effect of pH and Reaction Time

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