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69 results for “graphene oxide”
NaOH-assisted hydrothermal reduction of graphene oxide
<p><span>The influence of the pH of the reaction medium on the structural characteristics of hydrothermally reduced graphene oxide, synthesized by the Tour method, has been investigated. Varying the pH of the reaction medium within the range of 8.0, 10.0 and 12.0 (adjusted with NaOH) has revealed distinct effects on the morphology and properties of the resulting reduced graphene oxide. At a pH of 8.0 the hydrothermal treatment yielded reduced graphene oxide comprising of two particle fractions with a thickness equivalent to 4-5 graphitic layers each. In contrast, pH of 10.0 resulted in two particle fractions corresponding to 2–3 and 4 layers, respectively, while pH of 12.0 produced a single fraction with a particle thickness of 0.70 nm, encompassing 3 graphitic layers. Increasing the pH led to a decrease in the average lateral size of reduced graphene oxide particles to about 8 nm. All rGOs had micro- and mesopores with a specific surface area up to 226 m<sup>2</sup>/g, showing a proportional increase in mesopores with increasing pH. Analysis of slit-like micropores revealed a minimum fractal dimension (<em>D</em> = 2.18) at pH = 8.0. The obtained results provide valuable insights into tailoring the structural properties of hydrothermally reduced graphene oxide by controlling the pH of the reaction medium, offering potential applications in various fields, including nanotechnology and materials science.</span></p>
Reduced Graphene Oxide Electrolyte-Gated Transistor Immunosensor with Highly Selective Multiparametric Detection of Anti-Drug Antibodies
<p>Dataset for the publication: </p> <p>Sensi, M., de Oliveira, R. F., Berto, M., Palmieri, M., Ruini, E., Livio, P. A., Conti, A., Pinti, M., Salvarani, C., Cossarizza, A., Cabot, J. M., Ricart, J., Casalini, S., González-García, M. B., Fanjul-Bolado, P., Bortolotti, C. A., Samorì, P., Biscarini, F., Reduced Graphene Oxide Electrolyte-Gated Transistor Immunosensor with Highly Selective Multiparametric Detection of Anti-Drug Antibodies. <em>Adv. Mater.</em> 2023, 2211352. <a href="https://doi.org/10.1002/adma.202211352">https://doi.org/10.1002/adma.202211352</a></p> <p>Transfer curves measured with different analytes (used for Figure 3 in the results and discussion section of the publication). In every file are reported the gate-source voltages (V<sub>GS</sub>) and the average drain-source currents (I<sub>DS</sub>) after exposure of the gate to ATI (Transfer_ATI-dataset), ATI+TNFa(Transfer_ATI+TNFa-dataset), TNFa(Transfer_TNFa-dataset) at specific concentration. Transfer_control is the dataset for the control experiments, without the probe on gate.</p> <p>EIS (EIS-functionalization-dataset) dataset has been used for the functionalization in figure 2b. In the the file are reported the frequency, the real and the imaginary impedance for each functionalization step (in specific tabs Au, SAM, IFX+ETA). Transfer (Transfer-functionalization-dataset) dataset used for the functionalization in figure 2c. In the the file are reported the V<sub>GS</sub> and the I<sub>DS </sub>for each functionalization step (in specific tabs Au, SAM, IFX+ETA).</p>
Data from: Antibacterial activity of graphene oxide nanosheet against multi drug resistant superbugs isolated from infected patients
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Rapid synthesis and characterization of silver-loaded graphene oxide nanomaterials and their antibacterial applications
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Hierarchically Porous Reduced Graphene Oxide Coated with Metal-Organic Framework HKUST-1 for Enhanced Hydrogen Gas Affinity
<p>Metal organic frameworks (MOFs) are crystalline porous materials with interconnected pores and have been actively explored for various gas storage, separation and conversion applications due to their structural tunability. While the micropores (<2 nm) in MOFs are essential for increased gas affinity, these small pores significantly decrease the mass transport kinetics. One way to address this challenge is to develop hierarchically porous MOFs with interconnected micro-, meso- and macropores. Whereas these MOFs can be formed by using soft/hard templates or by creating pores through post-modification, it can also be achieved by growing MOFs on structural templates such as porous carbons i.e., reduced graphene oxide. The latter strategy can enable the introduction of hierarchical porosity, while creating a synergistic effect to simultaneously improve both mechanical property and gas affinity by creating pores at the interface. In this direction, we demonstrated that the coating of HKUST-1 onto a porous reduced graphene oxide (HRGO) led to the formation of a hierarchically porous structure, namely, HKUST-1@HRGO with increased affinity towards H2 gas. While the isosteric heats of adsorption (<em>Q</em><sub>st</sub>) values for H2 were found to be 7.7, 6.9 and 6.7 kJ mol<sup>-1</sup> for HRGO, HKUST-1 and the physical mixture of HKUST-1 and HRGO, respectively, at zero coverage, that of HKUST-1@HRGO composite revealed a significant increase up to 9.26 kJ mol<sup>-1 </sup>,<sup> </sup>thus clearly demonstrating not only the synergetic effect between HKUST-1 and the reduced graphene oxide and also the critical role interfacial pores as high affinity binding sites.</p> <p> </p>
Effect of long-term aging on graphene oxide: structure and thermal decomposition
<p>FTIR, XRD, Raman, AFM, XPS were used to characterize graphene oxide aged for 2 years. The results showed that after aging, the C/O ratio of graphene oxide increased from 1.96 to 2.76, but the type of oxygen-containing functional groups did not change. In addition to oxygen-containing functional groups, the content of -CH3, -CH2- and physically adsorbed water also decreased. The change in the structure is manifested by the reduction of the average interlayer distance from 1.320 nm to 1.134 nm. Moreover, ID/IG increased from 0.95 to 1.03, indicating that the defect density in the carbon skeleton increased after aging. The thermal decomposition process of graphene oxide and its decomposition products were analyzed by thermogravimetric combined with Infrared spectroscopy. When the temperature exceeds 60°C, the infrared signal of CO2 produced by the decomposition of graphene oxide can be detected. After aging, the decomposition peak temperature of graphene oxide decreased from 216 to 195°C. The amount of CO2 produced in the decomposition products is almost unchanged, while the amount of CO and H2O produced decreases, and the amount of SO2 produced decreases significantly. The OH radicals and heat accumulated during the decomposition process may in turn accelerate the decomposition rate, leading to a thermal runaway process at 216°C.</p>
NaOH-assisted hydrothermal reduction of graphene oxide
<p><span>The influence of the pH of the reaction medium on the structural characteristics of hydrothermally reduced graphene oxide, synthesized by the Tour method, has been investigated. Varying the pH of the reaction medium within the range of 8.0, 10.0 and 12.0 (adjusted with NaOH) has revealed distinct effects on the morphology and properties of the resulting reduced graphene oxide. At a pH of 8.0 the hydrothermal treatment yielded reduced graphene oxide comprising of two particle fractions with a thickness equivalent to 4-5 graphitic layers each. In contrast, pH of 10.0 resulted in two particle fractions corresponding to 2–3 and 4 layers, respectively, while pH of 12.0 produced a single fraction with a particle thickness of 0.70 nm, encompassing 3 graphitic layers. Increasing the pH led to a decrease in the average lateral size of reduced graphene oxide particles to about 8 nm. All rGOs had micro- and mesopores with a specific surface area up to 226 m<sup>2</sup>/g, showing a proportional increase in mesopores with increasing pH. Analysis of slit-like micropores revealed a minimum fractal dimension (<em>D</em> = 2.18) at pH = 8.0. The obtained results provide valuable insights into tailoring the structural properties of hydrothermally reduced graphene oxide by controlling the pH of the reaction medium, offering potential applications in various fields, including nanotechnology and materials science.</span></p>
Dual Drug Delivery in Cancer Therapy Using Graphene Oxide-Based Nanoplatforms
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Dataset for publication Functionalisation of graphite and thermally reduced graphene oxide with bishydrazone copper(I) nitrate salt
<p>Dataset for publication Functionalisation of graphite and thermally reduced graphene oxide with bis-hydrazone copper(I) nitrate salt.</p> <p>The dataset contains all relevant data and figures regarding the manuscript "Functionalisation of graphite and thermally reduced graphene oxide with bis-hydrazone copper(I) nitrate salt".</p> <p>All Figures are in tiff format and all relevant data are in csv formats. </p> <p>The data in csv format are labelled as specified in the corresponding images (e.g. Figure 4A csv file corresponds to data used to plot graphs from Figure 4A etc.). </p> <p>Axis labeling and units are always specified at the beginning of individual columns. If more than one curve was plotted from the csv file, the conditions can also be found at the beginning of corresponding columns.</p>
Direct electrochemical reduction of graphene oxide thin film for aptamer-based selective and highly sensitive detection of matrix metalloproteinase 2
<p>Simple and low-cost biosensing solutions are suitable for point-of-care applications aiming to overcome the gap between scientific concepts and technological production. To compete with sensitivity and <a title="Learn more about selectivity from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/selectivity">selectivity</a> of golden standards, such as <a title="Learn more about liquid chromatography from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/materials-science/liquid-chromatography">liquid chromatography</a>, the functionalization of biosensors is continuously optimized to enhance the signal and improve their performance, often leading to complex chemical assay development. In this research, the efforts are made on optimizing the methodology for <a title="Learn more about electrochemical reduction from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/materials-science/electrochemical-reaction">electrochemical reduction</a> of <a title="Learn more about graphene oxide from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/chemistry/graphene-oxide">graphene oxide</a> to produce thin film-modified gold electrodes. Under the employed specific conditions, 20 cycles of <a title="Learn more about cyclic voltammetry from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/cyclic-voltammetry">cyclic voltammetry</a> (CV) are shown to be optimal for superior electrical activation of <a title="Learn more about graphene oxide from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/materials-science/graphene-oxide">graphene oxide</a> into electrochemically <a title="Learn more about reduced graphene oxide from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/materials-science/reduced-graphene-oxide">reduced graphene oxide</a> (ERGO). This platform is further used to develop a <a title="Learn more about matrix metalloproteinase 2 from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/mmp2">matrix metalloproteinase 2</a> (MMP-2) biosensor, where specific anti-MMP2 <a title="Learn more about aptamers from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/aptamer">aptamers</a> are utilized as a biorecognition element. MMP-2 is a protein which is typically overexpressed in tumor tissues, with important roles in tumor invasion, metastasis as well as in tumor <a title="Learn more about angiogenesis from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/angiogenesis">angiogenesis</a>. Based on impedimetric measurements, we were able to detect as low as 3.32 pg mL<sup>−1</sup> of MMP-2 in PBS with a dynamic range of 10 pg mL<sup>−1</sup> – 10 ng mL<sup>−1</sup>. Further experiments with real blood samples revealed a promising potential of the developed sensor for direct measurement of MMP-2 in complex media. High specificity of detection is demonstrated – even to the closely related <a title="Learn more about enzyme from ScienceDirect's AI-generated Topic Pages" href="https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/enzyme">enzyme</a> MMP-9. Finally, the potential of reuse was demonstrated by signal restoration after experimental detection of MMP-2.</p>
Comparative Study of Field-Effect Transistors Based on Graphene Oxide and CVD Graphene in Highly Sensitive NT-proBNP Aptasensors
<p>Graphene-based materials are actively being investigated as sensing elements for the detection of different analytes. Both graphene grown by chemical vapor deposition (CVD) and graphene oxide (GO) produced by the modified Hummers’ method are actively used in the development of biosensors. The production costs of CVD graphene- and GO-based sensors are similar; however, the question remains regarding the most efficient graphene-based material for the construction of point-of-care diagnostic devices. To this end, in this work, we compare CVD graphene aptasensors with the aptasensors based on reduced GO (rGO) for their capabilities in the detection of NT-proBNP, which serves as the gold standard biomarker for heart failure. Both types of aptasensors were developed using commercial gold interdigitated electrodes (IDEs) with either CVD graphene or GO formed on top as a channel of liquid-gated field-effect transistor (FET), yielding GFET and rGO-FET sensors, respectively. The functional properties of the two types of aptasensors were compared. Both demonstrate good dynamic range from 10 fg/mL to 100 pg/mL. The limit of detection for NT-proBNP in artificial saliva was 100 fg/mL and 1 pg/mL for rGO-FET- and GFET-based aptasensors, respectively. While CVD GFET demonstrates less variations in parameters, higher sensitivity was demonstrated by the rGO-FET due to its higher roughness and larger bandgap. The demonstrated low cost and scalability of technology for both types of graphene-based aptasensors may be applicable for the development of different graphene-based biosensors for rapid, stable, on-site, and highly sensitive detection of diverse biochemical markers.</p>
Interaction of graphene oxide nanoparcticles with human mesenchymal stem cells
<p>Interaction of graphene oxide nanoparcticles with human mesenchymal stem cells visualized by phase-contrast microscopy (Cell-IQ system) over 24 hours. Two concentrations of nanoparticles were used: 5 µg/mL and 25 µg/mL. Four types of particles were used:</p> <table> <tbody> <tr> <td> <p><strong>Notation</strong></p> </td> <td> <p><strong>Diameter (nm)</strong></p> </td> <td> <p><strong>Coating</strong></p> </td> </tr> <tr> <td> <p>P-GOs</p> </td> <td> <p>184 ± 73</p> </td> <td> <p>Linear PEG</p> </td> </tr> <tr> <td> <p>bP-GOs</p> </td> <td> <p>287 ± 52</p> </td> <td> <p>Branched PEG</p> </td> </tr> <tr> <td> <p>P-GOb</p> </td> <td> <p>569 ± 14</p> </td> <td> <p>Linear PEG</p> </td> </tr> <tr> <td> <p>bP-GOb</p> </td> <td> <p>1376 ± 48</p> </td> <td> <p>Branched PEG</p> </td> </tr> </tbody> </table> <p>File names in the archive are as follows:</p> <p>Video S1: Visualization of incubation of cells with P-GOs nanoparticles (5 μg/mL)<br> Video S2: Visualization of incubation of cells with P-GOs nanoparticles (25 μg/mL)<br> Video S3: Visualization of incubation of cells with bP-GOs nanoparticles (5 μg/mL)<br> Video S4: Visualization of incubation of cells with bP-GOs nanoparticles (25 μg/mL)<br> Video S5: Visualization of incubation of cells with P-GOb nanoparticles (5 μg/mL)<br> Video S6: Visualization of incubation of cells with P-GOb nanoparticles (25 μg/mL)<br> Video S7: Visualization of incubation of cells with bP-GOb nanoparticles (5 μg/mL)<br> Video S8: Visualization of incubation of cells with bP-GOb nanoparticles (25 μg/mL)<br> Video S9: Visualization of incubation of cells in the control group (without GO nanoparticles)</p>
Effect of long-term aging on graphene oxide: structure and thermal decomposition
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A novel colorimetric method for Salmonella spp. detection based on the peroxidase activity of Cu(II)-modified reduced graphene oxide nanoparticles and PCR
<p>Figure 1s. The zeta potential of nanomaterials in sodium acetate buffer (pH 4)</p>
Data from: Photocatalytic activity of graphene oxide–TiO2 thin films sensitized by natural dyes extracted from Bactris guineensis
This study synthesized and characterized composites of graphene oxide and TiO2 (GO-TiO2). GO-TiO2 thin films were deposited using the Doctor Blade technique. Subsequently, the thin films were sensitized with a natural dye extracted from a Colombian source (Bactris guineensis). Thermogravimetric analysis, X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and diffuse reflectance measurements were used for physicochemical characterization. All the samples were polycrystalline in nature, and the diffraction signals corresponded to the TiO2 anatase crystalline phase. Raman spectroscopy and FT-IR verified the synthesis of composite thin films, and the SEM analysis confirmed the TiO2 films morphological modification after the process of GO incorporation and sensitization. XPS results suggested a possibility of appearance of Titanium (III) through the formation of oxygen vacancies (Ov). Furthermore, the optical results indicated that the presence of the natural sensitizer and GO improved the optical properties of TiO2 in the visible range. Finally, the photocatalytic degradation of Methylene Blue (MB) was studied under visible irradiation in aqueous solution, and pseudo-first order model was used to obtain kinetic information about photocatalytic degradation. These results indicated that the presence of GO has an important synergistic effect in conjunction with the natural sensitizer, reaching a photocatalytic yield of 33%.
Data from: Microbeam two-dimensional small-angle X-ray scattering investigating the effects of reduced graphene oxide on local microstructures of high-density polyethylene/reduced graphene oxide nanocomposite bars
It has reported that the introduction of reduced graphene oxide (RGO) can enhance the crystallization and orientation of high density polyethylene (HDPE) matrix and thus improve the mechanical properties of HDPE/RGO nanocomposites. Herein, the local microstructures and orientations in different regions of HDPE/RGO bars with varied RGO contents were further explored by two dimensional small angle X-ray scattering (2D SAXS) using a microbeam technique. It is unveiled that the orientation orderings of every positions are all intensified with increasing RGO amount, and of particular interest is the observation of the quite slight change of the ordering degrees in diverse zones of HDPE/RGO nanocomposite bars, implicating that RGO imposes a uniform enhancing effect upon HDPE matrix within different areas and consequently reflects an effective increase of mechanical properties of HDPE/RGO nanocomposites.
Methane production for fed-batch assays amended with graphene oxide and two standard substrates
<p>The spreadsheet contains all the data generated using the Automatic Methane Potential Tests System (AMPTS) for fed-batch experiments containing graphene oxide (GO) at 0, 5, 10, and 20 mg of GO per g of volatile solids (VS).</p> <p>Also, the dataset is divided accordingly to the two substrates used, i.e., glucose (G) and microcrystalline cellulose (C).</p>
Adsorption and release on three-dimensional graphene oxide network structures
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Data from: Femtosecond laser-assisted synthesis of silver nanoparticles and reduced graphene oxide hybrid for optical limiting
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Data from: Photocatalytic activity of graphene oxide–TiO2 thin films sensitized by natural dyes extracted from Bactris guineensis
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.