16,326 results match your criteria graphene oxide


Nitrogen, sulfur co-doped hierarchical carbon encapsulated in graphene with "sphere-in-layer" interconnection for high-performance supercapacitor.

J Colloid Interface Sci 2021 Apr 21;599:443-452. Epub 2021 Apr 21.

Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China. Electronic address:

Rational design of electrode with hierarchical charge-transfer structure and good electronic conductivity is important to achieve high specific capacitance and energy density for supercapacitor, but it still remains a challenge. Herein, a nitrogen, sulfur co-doped pollen-derived carbon/graphene (PCG) composite with interconnected "sphere-in-layer" structure was fabricated, in which hierarchically pollen-derived carbon microspheres can serve as "porous spacers" to prevent the agglomeration of graphene nanosheets. The optimized PCG composite prepared with 0. Read More

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A green and facile approach to a graphene-based peroxidase-like nanozyme and its application in sensitive colorimetric detection of L-cysteine.

Anal Bioanal Chem 2021 May 7. Epub 2021 May 7.

CAS Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Anhui Key Laboratory of Environmental Toxicology and Pollution Control Technology, Hefei Institute of IntelligentAgriculture, Institute of Intelligent Machines,Hefei Institutes of Physical Science, Chinese Academy of Sciences (CAS), Hefei, 230031, Anhui, China.

A facile and green approach to the preparation of peroxidase-like nanozymes by reducing and functionalizing graphene oxide (rGO) with Ganoderma polysaccharide (GP) has been achieved in this work. Our results showed that the as-fabricated nanozyme, namely rGO-GP, possessed the excellent property of simulating peroxidase with higher catalytic activity compared with GO or rGO obtained by using chitosan, which may be due to the better dispersion of rGO-GP in the solution. Steady-state kinetics studies further showed that the catalytic process conformed to Michaelis-Menten equation and ping-pong mechanism. Read More

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A graphene oxide coated tapered microfiber acting as a super-sensor for rapid detection of SARS-CoV-2.

Lab Chip 2021 May 7. Epub 2021 May 7.

Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

COVID-19 is a new strain of highly contagious coronavirus, and at present, more than 221.4 million people have been infected with this virus, and the death toll exceeds 2793398. Early and fast detection of COVID-19 from infected individuals is critical to limit its spreading. Read More

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Reversible fusion and fission of graphene oxide-based fibers.

Science 2021 May;372(6542):614-617

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province, Zhejiang University, Hangzhou 310027, China.

Stimuli-responsive fusion and fission are widely observed in both bio-organizations and artificial molecular assemblies. However, the design of a system with structure and property persistence during repeated fusion and fission remains challenging. We show reversible fusion and fission of wet-spun graphene oxide (GO) fibers, in which a number of macroscopic fibers can fuse into a thicker one and can also separate into original individual fibers under stimulation of solvents. Read More

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Magnetic Graphene Oxide-Based Affinity Surface-Assisted Laser Desorption/Ionization Mass Spectrometry for Screening of Aflatoxin B1 from Complex Samples.

Anal Chem 2021 May 6. Epub 2021 May 6.

Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan.

Aflatoxin B1 (AFB1), commonly found in agriculture products, has been considered as a carcinogen. Thus, to develop analytical methods that can be used to rapidly screen the presence of AFB1 in complex samples is important. Surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) uses inorganic materials as assisting materials to facilitate desorption/ionization of analytes. Read More

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Enhanced Electroactivity, Mechanical Properties, and Printability through the Addition of Graphene Oxide to Photo-Cross-linkable Gelatin Methacryloyl Hydrogel.

ACS Biomater Sci Eng 2021 May 6. Epub 2021 May 6.

ARC Centre of Excellence for Electromaterials Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, Victoria 3122, Australia.

The human tissues most sensitive to electrical activity such as neural and muscle tissues are relatively soft, and yet traditional conductive materials used to interface with them are typically stiffer by many orders of magnitude. Overcoming this mismatch, by creating both very soft and electroactive materials, is a major challenge in bioelectronics and biomaterials science. One strategy is to imbue soft materials, such as hydrogels, with electroactive properties by adding small amounts of highly conductive nanomaterials. Read More

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Fabrication of magnetic FeO@SiO@BiOCO/rGO composite for enhancing its photocatalytic performance for organic dyes and recyclability.

Environ Sci Pollut Res Int 2021 May 6. Epub 2021 May 6.

School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.

A novel magnetic FeO@SiO@BiOCO/rGO composite comprising of uniform core-shell-structured FeO@SiO@BiOCO microspheres mounted on reduced graphene oxide (rGO) sheets was successfully fabricated by using a facile hydrothermal method. The adsorption-desorption isotherm of FeO@SiO@BiOCO/rGO belonged to type IV with an H4-type hysteresis loop. The specific surface areas and magnetization saturation value (M) of FeO@SiO@BiOCO/rGO (x = 0. Read More

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Lowly-aggregated perylene diimide as a near-infrared electrochemiluminescence luminophore for ultrasensitive immunosensors at low potentials.

Analyst 2021 May 6. Epub 2021 May 6.

Chemistry and Chemical Engineering College, Liaocheng University, Liaocheng, 252059, China.

In the electrochemiluminescence (ECL) field, most reported luminophores were focused on high-triggering potential and short wavelength, which was adverse for the ECL theory study and application at low potentials. Perylene diimide derivatives could emit near-infrared (NIR) ECL at low-triggering potential; however, they are always highly aggregated into a microrod structure and stacked together, which largely limited their application in biological fields such as bio-sensing and bio-imaging. To overcome these obstacles, we designed a novel perylene diimide molecule, namely N,N'-dicaproate sodium-3,4,9,10-perylenedicarboximide (PDI-COONa). Read More

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Interaction with teichoic acids contributes to highly effective antibacterial activity of graphene oxide on Gram-positive bacteria.

J Hazard Mater 2021 Jun 5;412:125333. Epub 2021 Feb 5.

Institut für Biologie, Freie Universität Berlin, Berlin D-14195, Germany.

Graphene oxide (GO) has high-efficient antibacterial activity to diverse pathogenic bacteria. However, the detailed antibacterial mechanism of GO is not fully clear. Herein the antibacterial properties of GO against model Gram-positive (Gram+) (Staphylococcus aureus and Staphylococcus epidermidis) and Gram-negative (Gram-) bacteria (Pseudomonas aeruginosa and Escherichia coli) were compared by plate count method. Read More

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A Novel Nonenzymatic Ascorbic Acid Electrochemical Sensor Based on Gold Nanoparticals-Chicken Egg White-Copper Phosphate-Graphene Oxide Hybrid Nanoflowers.

Nanotechnology 2021 May 5. Epub 2021 May 5.

Shaanxi University of Science and Technology Xi'an Campus, Xi'an, Shaanxi, CHINA.

Au-CEW-Cu3(PO4)2-GO nanoflowers (HNFs), which were assembled of gold nanoparticals (Au NPs), chicken egg white (CEW), copper phosphate (Cu3(PO4)2) and graphene oxide (GO) together to form a flower-like organic/inorganic hybrid nanocomposite, were synthesized through a simple and gentle one-pot co-precipitation method. The prepared samples were well characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectrometer (EDX), X-ray diffraction (XRD) and Raman spectrometer. The prepared Au-CEW-Cu3(PO4)2-GO HNFs was used to modify glassy carbon electrode (GCE) to fabricate an electrochemical sensor for detection of ascorbic acid (AA). Read More

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TEMPO-Oxidized Bacterial Cellulose Nanofibers/Graphene Oxide Fibers for Osmotic Energy Conversion.

ACS Appl Mater Interfaces 2021 May 5. Epub 2021 May 5.

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China.

The large osmotic energy between river water and seawater is an inexhaustible blue energy source; however, the complicated manufacturing methods used for ion-exchange devices hinder the development of reverse electrodialysis (RED). Here, we use a wet-spinning method to continuously spin meter-scale 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized bacterial cellulose (TOBC) nanofiber filaments, which are then used to construct nanochannels for osmotic energy conversion. These are then used to build a nacre-like structure by adding graphene oxide (GO), which provides narrow nanochannels in one-dimensional and two-dimensional nanofluid systems for rapid ion transport. Read More

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Enhanced optical limiting and hydrogen evolution of graphene oxide nanohybrids covalently functionalized by covalent organic polymer based on porphyrin.

Dalton Trans 2021 May 4. Epub 2021 May 4.

College of Physical Science and Technology, Soochow University, Suzhou, 215006, China.

Herein, we report a novel graphene oxide (GO) nanohybrid covalently functionalized by covalent organic polymer (COP) based on porphyrin (GO-TPPCOP), as the optical limiter and hydrogen evolution reaction (HER) electrocatalyst. The GO-TPPCOP nanohybrid exhibits markedly enhanced optical limiting and HER activity over that of TPP, GO and TPPCOP alone. More importantly, the optical limiting property and HER activity of GO-TPPCOP nanohybrid are comparable to the state-of-the-art activity of materials from some previous reports. Read More

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Graphene-based materials: the key for the successful application of pHEMA as a blood-contacting device.

Biomater Sci 2021 May;9(9):3362-3377

INEB - Instituto de Engenharia Biomédica, Universidade do Porto, Portugal. and i3S - Instituto de Inovação e Investigação em Saúde, Universidade do Porto, Portugal.

Thrombosis and infection are the leading causes of blood-contacting device (BCD) failure, mainly due to the poor performance of existing biomaterials. Poly(2-hydroxyethyl methacrylate) (pHEMA) has excellent hemocompatibility but the weak mechanical properties impair its use as a bulk material for BCD. As such, pHEMA has been explored as a coating, despite the instability and difficulty of attachment to the underlying polymer compromise its success. Read More

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Utilization of rGO-PEI-supported AgNPs for sensitive recognition of deltamethrin in human plasma samples: A new platform or the biomedical analysis of pesticides in human biofluids.

J Mol Recognit 2021 May 4:e2900. Epub 2021 May 4.

Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.

In this study, the rGO-PEI-AgNPs sensor was designed as a new effective platform to sensitive monitoring of deltamethrin in human plasma samples. For this purpose, reduced graphene oxide (rGO)-supported polyethylenimine (PEI) was used as a suitable substrate for dispersion of silver nanoparticles (AgNPs) as amplification and catalytic element. Therefore, a novel interface (rGO-PEI-AgNPs) was prepared by the fully electrochemical method on the surface of glassy carbon electrodes. Read More

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Multifunctional graphene-based nanocomposites for simultaneous enhanced photocatalytic degradation and photothermal antibacterial activity by visible light.

Environ Sci Pollut Res Int 2021 May 4. Epub 2021 May 4.

College of International Education, Zhongyuan University of Technology, Zhengzhou, 450007, People's Republic of China.

A new strategy for the wastewater treatment was proposed by combining polyvinylpyrrolidone-functionalized silver nanoparticles with reduced graphene oxide (AgNPs-PVP@rGO) as a visible light-triggered photoactive nanocomposite. The nanocomposite with enhanced photocatalytic degradation and photothermal antibacterial activity can simultaneously decrease the content of organic pollutants and bacteria in the wastewater under visible light irradiation. The efficiency of photocatalytic degradation can be significantly improved by the conjugation of AgNPs onto the rGO surface. Read More

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Diamine vapor treatment of viscoelastic graphene oxide liquid crystal for gas barrier coating.

Sci Rep 2021 May 4;11(1):9518. Epub 2021 May 4.

Department of Chemical and Biomolecular Engineering, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, Republic of Korea.

A layered graphene oxide/ethylenediamine (GO/EDA) composite film was developed by exposing aqueous GO liquid crystal (GOLC) coating to EDA vapor and its effects on the gas barrier performance of GO film were systematically investigated. When a GO/EDA coating with a thickness of approximately 1 μm was applied to a neat polyethylene terephthalate (PET) film, the resultant film was highly impermeable to gas molecules, particularly reducing the gas permeance up to 99.6% for He and 98. Read More

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Electrical and visible light dual-responsive ZnO nanocomposite with multiple wound healing capability.

Mater Sci Eng C Mater Biol Appl 2021 May 26;124:112066. Epub 2021 Mar 26.

College of Chemistry, Nanchang University, Nanchang, Jiangxi 330088, PR China; The National Engineering Research Center for Bioengineering Drugs and the Technologies, Institute of Translational Medicine, Nanchang University, Nanchang, Jiangxi 330088, PR China. Electronic address:

The healing process of open wounds is a competition between cells and bacteria. Therefore, a strategy that can quickly remove bacteria and promote cell proliferation to accelerate wound healing is urgently needed. Inspired by photoelectric synergy tactics, we improved both the optical and electrical response of zinc oxide (ZnO) through the modification of polydopamine (PDA) and reduced graphene oxide (rGO), thus obtaining a ZnO composite named PDA-rGO-ZnO (PrZ). Read More

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Chitosan/Silver Nanoparticle/Graphene Oxide Nanocomposites with Multi-Drug Release, Antimicrobial, and Photothermal Conversion Functions.

Materials (Basel) 2021 Apr 30;14(9). Epub 2021 Apr 30.

School of Mechanical & Aerospace Engineering, Queens University Belfast, Belfast BT9 5AH, UK.

In this work, we designed and fabricated a multifunctional nanocomposite system that consists of chitosan, raspberry-like silver nanoparticles, and graphene oxide. The room temperature atmospheric pressure microplasma (RT-APM) process provides a rapid, facile, and environmentally-friendly method for introducing silver nanoparticles into the composite system. Our composite can achieve a pH controlled single and/or dual drug release. Read More

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Graphitized-rGO/Polyimide Aerogel as the Compressible Thermal Interface Material with Both High In-Plane and Through-Plane Thermal Conductivities.

Materials (Basel) 2021 Apr 30;14(9). Epub 2021 Apr 30.

Department of Optoelectronic Information Science and Engineering, College of Electronic and Opitical Engineering, Nanjing University of Posts&Telecommunications, Nanjing 210023, China.

Reduced graphene oxide (rGO) aerogels with a three-dimensional (3D) interconnected network provides continuous heat transport paths in multi-directions. However, the high porosity of rGO aerogels commonly leads to very low thermal conductivity (TC), and defects and grain boundaries of rGO sheets result in a high extent of phonon scattering, which is far from satisfying the requirement of thermal interface materials (TIMs). Here, a compressible graphitized-rGO/polyimide (g-rGO/PI) aerogel was prepared by the ice-template method and "molecular welding" strategy. Read More

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Nano Carbon Doped Polyacrylamide Gel Electrolytes for High Performance Supercapacitors.

Molecules 2021 Apr 30;26(9). Epub 2021 Apr 30.

Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA.

Novel polyacrylamide gel electrolytes (PGEs) doped with nano carbons with enhanced electrochemical, thermal, and mechanical properties are presented. Carboxylated carbon nanotubes (fCNTs), graphene oxide sheets (GO), and the hybrid of fCNT/GO were embedded in the PGEs to serve as supercapacitor (SC) electrolytes. Thermal stability of the unmodified PGE increased with the addition of the nano carbons which led to lower capacitance degradation and longer cycling life of the SCs. Read More

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Conductive Biomass Films Containing Graphene Oxide and Cationic Cellulose Nanofibers for Electric-Heating Applications.

Nanomaterials (Basel) 2021 Apr 30;11(5). Epub 2021 Apr 30.

Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.

A low-voltage biomass matrix and flexible electric-heating composite with graphene oxide (GO) and cationic cellulose nanofiber (CCNF) were fabricated by ultrasonic dispersion and suction filtration. The main results show that the tensile strength and strain of the films decreased with an increase in the GO content, but the thermal stability increased. The GO/CCNF film underwent rapid thermal decomposition at 250-350 °C, and the maximum degradation temperature was higher by 19 °C compared to that of the pure CCNF film. Read More

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Enhanced electrochemical performance of MnNiO/rGO nanocomposite as pseudocapacitor electrode material and methanol electro-oxidation catalyst.

Nanotechnology 2021 May 4. Epub 2021 May 4.

Dumlupinar University, Kutahya, Kütahya, TURKEY.

Binary transition metal oxides with encouraging electrocatalyst properties have been suggested as electrode materials for supercapacitors and methanol oxidation. Hence, in this work, a binary mixed metal oxide based on nickel and manganese (MnNiO) and its hybrid with reduced graphene oxide were synthesized by a one-step hydrothermal method. After physical and morphological characterization, the potential of these nanostructures was investigated for use as supercapacitor electrodes and methanol electro-oxidation. Read More

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Enhanced Exciton Binding Energy, Zeeman Splitting and Spin Polarization in Hybrid Layered Nanosheets Comprised of (Cd, Mn)Se and Nitrogen-Doped Graphene Oxide: Implication for Semiconductor Devices.

Nanotechnology 2021 May 4. Epub 2021 May 4.

School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Jatni, Orissa, INDIA.

TThe exciton properties of (Cd, Mn)Se-NrGO (nitrogen-doped reduced graphene oxide) hybrid layered nanosheets have been studied in a magnetic field up to 10 T and compared to those of (Cd, Mn)Se nanosheets. The temperature-dependent photoluminescence reveals the hybridization of inter-band exciton and intra-center Mn transition with the enhancement of the binding energy of exciton-Mn hybridized state (80 meV with respect to 60 meV in (Cd,Mn)Se nanosheets) and increase of exciton - phonon coupling strength to 90 meV (with respect to 55 meV in (Cd,Mn)Se nanosheets). The circularly polarized magneto - photoluminescence at 2 K provides evidence for magnetic field induced exciton spin polarization and the realization of excitonic giant Zeeman splitting with geff as high as 165. Read More

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Photocatalytic degradation of amoxicillin from aqueous solutions by titanium dioxide nanoparticles loaded on graphene oxide.

Environ Sci Pollut Res Int 2021 May 3. Epub 2021 May 3.

Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, AP, 52250, India.

The photocatalytic degradation of amoxicillin (AMX) by titanium dioxide nanoparticles loaded on graphene oxide (GO/TiO) was evaluated under UV light. Experimental results showed that key parameters such as initial pH, GO/TiO dosage, UV intensity, and initial AMX concentration had a significant effect on AMX degradation. Compared to the photolysis and adsorption processes, the AMX degradation efficiency was obtained to be more than 99% at conditions including pH of 6, the GO/TiO dosage of 0. Read More

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Intranasal vaccination with influenza HA/GO-PEI nanoparticles provides immune protection against homo- and heterologous strains.

Proc Natl Acad Sci U S A 2021 May;118(19)

Center for Inflammation, Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, GA 30302;

Intranasal (i.n.) immunization is a promising vaccination route for infectious respiratory diseases such as influenza. Read More

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Solar to hydrocarbon production using metal-free water-soluble bulk heterojunction of conducting polymer nanoparticle and graphene oxide.

J Chem Phys 2021 Apr;154(16):164707

Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan.

This work demonstrates the first example of interfacial manipulation in a hybrid photocatalyst based on poly(3-hexylthiophene-2,5-diyl) (P3HT) nanoparticle and graphene oxide (GO) bulk heterojunctions to efficiently reduce CO into selective industrial hydrocarbons under gas-phase reaction and visible-light illumination. High selectivity of chemical products (methanol and acetaldehyde) was observed. Moreover, the hybrid photocatalyst's solar-to-fuel conversion efficiency was 13. Read More

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Decontamination of radioactive cesium-contaminated soil/concrete with washing and washing supernatant- critical review.

Chemosphere 2021 Apr 26;280:130419. Epub 2021 Apr 26.

Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seoul, 04763, South Korea. Electronic address:

We reviewed washing of radioactive Cs-contaminated concrete and soil based on the fate of Cs in concrete and soil, including sorption materials for treatment of supernatant solution. In non-aged cement materials (the calcium silicate hydration (C-S-H) phase), it was possible to decontaminate Cs using ion exchange with monovalent cations, such as NH. The clay components in the soil and aggregates were important factors in optimization of the efficiency and mechanism for Cs decontamination with washing solution. Read More

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PEGylated Phthalocyanine-Functionalized Graphene Oxide with Ultrahigh-Efficient Photothermal Performance for Triple-Mode Antibacterial Therapy.

ACS Biomater Sci Eng 2021 May 3. Epub 2021 May 3.

School of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, P. R. China.

This study proposes a novel multifunctional synergistic antibacterial phototherapy technique for the rapid healing of bacteria-infected wounds. By binding PEGylated phthalocyanines to the surface of graphene oxide noncovalent functionalization, the photothermal conversion efficiency of the obtained nanocomposites can be significantly increased, which shows that the sample temperature can achieve nearly 100 °C after only 10 min of 450 nm light illumination at a concentration ≥25 μg/mL. Moreover, the nanocomposites can rapidly generate singlet oxygen under 680 nm light irradiation and physically cut bacterial cell membranes. Read More

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Preparation of Graphene Oxide-Embedded Hydrogel as a Novel Sensor Platform for Antioxidant Activity Evaluation of .

Front Chem 2021 16;9:675346. Epub 2021 Apr 16.

Suzhou TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Suzhou, China.

Antioxidation is very important in medicine and food. The current evaluation technologies often have many shortcomings. In this work, an improved electrochemical sensing platform for the evaluation of antioxidant activity has been proposed. Read More

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Nickel nanoparticle-decorated reduced graphene oxide/WO nanocomposite - a promising candidate for gas sensing.

Beilstein J Nanotechnol 2021 15;12:343-353. Epub 2021 Apr 15.

Institut für Anorganische Chemie und Strukturchemie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany.

We report for the first time the combination of WO sensing elements with a non-noble metal-carbon composite, namely a nickel metal nanoparticle-carbon composite (Ni@rGO). Previous work with WO had used either NiO (as part of the WO lattice), solely carbon, Pd-surface decorated WO (Pd@WO), or Pd or Pt@carbon@WO. We demonstrate the gas response for pure WO, rGO/WO and Ni@rGO/WO sensing elements towards NO and acetone in air as well as towards CO in N. Read More

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