Artykuły w czasopismach: „Reduced Graphene Oxide-Silver Nanocomposite”

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Qian, Yuhong, Yiting Wang i Li Wang. "Preparation of cuprous oxide-supported silver-modified reduced graphene oxide nanocomposites for non-enzymatic electrochemical sensor". Reviews in Analytical Chemistry 41, nr 1 (1.01.2022): 189–97. http://dx.doi.org/10.1515/revac-2022-0045.

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Abstract We constructed a non-enzymatic H2O2 sensor based on cuprous oxide-supported silver-modified reduced graphene oxide nanocomposites. It was found that the sensor exhibited good performances for sensing H2O2 with a detection limit of 0.34 μM and a wide detection range of 1–310 μM. The combination of graphene with silver and cuprous oxide improved the sensor’s sensitivity for detecting H2O2, with good repeatability, selectivity, and stability. The synthesis method of this nanocomposite provides a new idea for the green preparation of graphene-based nanocomposites and a new method for the construction of a new electrochemical sensor platform.

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Balakrishnan, Dhivyabharathi, i Cheng-I. Lee. "Surface Functionalization of Bamboo with Silver-Reduced Graphene Oxide Nanosheets to Improve Hydrophobicity and Mold Resistance". Coatings 12, nr 7 (11.07.2022): 980. http://dx.doi.org/10.3390/coatings12070980.

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A natural polyphenolic compound was used to assemble nanocomposites. Owing to its stable bioactive properties, bamboo has earned significant attention in material science. Its high nutrient content and hydrophilicity makes bamboo more vulnerable to mold attacks and shortened shelf lives. To produce efficient, multipurpose, long-life bamboo products, a novel technique involving an immersion dry hydrothermal process was applied to impregnate the bamboo with polyphenol-assisted silver-reduced graphene oxide nanosheets. Curcumin (Cur), a natural polyphenol found in the rhizome of Curcuma longa, was used in the preparation of curcumin-enhanced silver-reduced graphene oxide nanosheets (Cur-AgrGONSs). The nanocomposites and nanocomposite-impregnated bamboo materials were examined by field emission scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. At the same time, a phytopathogen was isolated from infected bamboo products and identified by internal transcribed spacer (ITS) sequences. The nanocomposites effectively inhibited the growth of the isolated fungus. The mold resistance and moisture content of both the treated and untreated bamboo timbers were also examined to determine the efficiency of the prepared nanocomposite. The antifungal activity and hydrophobicity of the bamboo materials were significantly enhanced after the incorporation of curcumin-enriched silver-loaded reduced graphene oxide nanosheets (B@Cur-AgrGONSs). This research outcome confirms that the nanocomposite is a well-organized antimicrobial material for different advanced domains.

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Perumal, Dharshini, Che Azurahanim Che Abdullah, Emmellie Laura Albert i Ruzniza Mohd Zawawi. "Green Synthesis of Silver Nanoparticle Decorated on Reduced Graphene Oxide Nanocomposite using Clinacanthus nutans and Its Applications". Sains Malaysiana 52, nr 3 (31.03.2023): 953–66. http://dx.doi.org/10.17576/jsm-2023-5203-19.

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A straightforward approach that uses Clinacanthus nutans leaf extract as a bio-reduction agent has been reported to anchor silver nanoparticles onto graphene oxide (rGO-Ag). The nanocomposite was characterized by using ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, field emission scanning electron microscopy with energy-dispersive X-ray spectroscopy, and X-ray diffraction. A qualitative colour transition from yellowish to dark brown confirmed the biosynthesis of rGO-Ag nanocomposite and showed a surface plasmon resonance at 263 nm and 425 nm. Utilizing cyclic voltammetry, the electrochemical characteristics of the rGO-Ag nanocomposite modified screen printed carbon electrodes were examined. The rGO-Ag nanocomposite electrode enhanced anodic current approximately 1.29 times greater compared to silver nanoparticles (AgNPs) and 1.34 times greater compared to graphene oxide (GO). Moreover, rGO-Ag nanocomposites exhibited excellent antibacterial activity against typical Gram-positive (S. aureus) (11.99 ± 0.26 mm) and Gram-negative (E. coli) (11.86 ± 0.29 mm) bacteria. Toxicity was assayed using brine shrimp Artemia salina. The results of hatching and mortality assay demonstrates that AgNPs and rGO-Ag nanocomposite is biocompatible with A. salina at a low dosage (0.001 mg/mL). This work offers a guide for the future synthesis of nanocomposites using green reductants. The as- synthesized nanocomposite shows a promising component for the development of biomedical devices applications.

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Barua, Shaswat, Pronobesh Chattopadhyay, Mayur M. Phukan, Bolin K. Konwar, Johirul Islam i Niranjan Karak. "Biocompatible hyperbranched epoxy/silver–reduced graphene oxide–curcumin nanocomposite as an advanced antimicrobial material". RSC Adv. 4, nr 88 (2014): 47797–805. http://dx.doi.org/10.1039/c4ra07802k.

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Periyasamy, Gnanaprakasam, Selvaraju Thangavelu i Saravanan Muthupandian. "Single-Step Synthesis of Ag Hexagonal Nanoplate-Decorated Reduced Graphene Oxide and Its Cytotoxicity Studies". Oxidative Medicine and Cellular Longevity 2023 (1.07.2023): 1–13. http://dx.doi.org/10.1155/2023/4466394.

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Graphene-based Ag nanocomposites are of specific interest because of their unique properties and applications, especially in the field of cytotoxicity. However, developing a simple method to synthesize reduced graphene oxide (rGO)/silver hexagonal nanoplate (Ag HNPT) (rGO–Ag HNPT) nanocomposites with well-defined morphology has been believed to be a major challenge. In this work, a facile, robust, and single-step synthesis method was developed to prepare silver-graphene (rGO–Ag HNPT) nanocomposites with hexagonal-structured silver nanoplates without any templates. The primary characterizations of the synthesized nanocomposite were done using a UV-visible spectrophotometer, X-ray diffraction (XRD), and Raman spectroscopy. The formation of uniformed hexagonal-shaped Ag nanoplates was confirmed by high-resolution transmission electron microscopy (HR-TEM), and the elemental composition was confirmed using energy dispersive X-ray analysis (EDX). With SiHa cervical cancer cells, the short-term in vitro cytotoxicity of the as-synthesized rGO–Ag HNPTs was evaluated by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The anticancer response of the rGO–Ag HNPTs was investigated using an MTT assay.

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Sedki, Mohammed, Mona B. Mohamed, Manal Fawzy, Dalia A. Abdelrehim i Mohamed M. S. A. Abdel-Mottaleb. "Phytosynthesis of silver–reduced graphene oxide (Ag–RGO) nanocomposite with an enhanced antibacterial effect using Potamogeton pectinatus extract". RSC Advances 5, nr 22 (2015): 17358–65. http://dx.doi.org/10.1039/c4ra13117g.

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Challa, Maalathi, M. R. Ambika, S. R. Usharani, Basappa C. Yallur i Vinayak Adimule. "Study on Optical Properties of Cu-MOF Nano Metal Oxide Composites". Applied Mechanics and Materials 908 (2.08.2022): 19–28. http://dx.doi.org/10.4028/p-266wz9.

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A copper metal organic frame work (MOF) is synthesized by taking equimolar terephthalic acid and copper nitrate and its MOF /nanocomposite are fabricated with silver oxide and reduced graphene oxide nanocompounds. It is characterized by XRD, UV-Vis spectroscopy and FTIR. The band gap of the MOF/ nanocomposites is reduced when compare to individuals. This reduction of band gap is due to a slight change in their individual band gaps or lattice distortion hybridization leads to shifting of the energy level.

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Shaikh, Aasiya, Smrutiranjan Parida i Sivasambu Böhm. "One step eco-friendly synthesis of Ag–reduced graphene oxide nanocomposite by phytoreduction for sensitive nitrite determination". RSC Advances 6, nr 102 (2016): 100383–91. http://dx.doi.org/10.1039/c6ra23655c.

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Bai, Rui, Yunpeng Zhao, Cuiying Lu, Yu Meng, Wenwen Gao, Yan Wang, Rui Dang, Miao Mu, Jinxi Wang i Yurong Jiao. "Sonochemical synthesis and electrochemical performance of reduced graphene oxide/cerium dioxide nanocomposites". Journal of Chemical Research 47, nr 2 (marzec 2023): 174751982311587. http://dx.doi.org/10.1177/17475198231158745.

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Reduced graphene oxide/cerium dioxide (is synthesized by a simple sonochemical route. The morphology and chemical structure of the nanocomposites are characterized by scanning electron microscopy, energy disperse spectroscopy, insitu infrared spectroscopy, and X-ray diffraction. The electrochemical properties of a fabricat reduced graphene oxide/cerium dioxide2 nanocomposite electrode examined by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The results indicate that the reduced graphene oxide can prevent the aggregation of cerium dioxide nanoparticles; meanwhile, the reduced graphene oxide/cerium dioxide-3 nanocomposite electrode exhibits excellent electrochemical performance with a high specific capacitance of 185 F·g−1 at 0.5 A·g−1, a high rate capability, and good reversibility, which results from the synergism and coupling between reduced graphene oxide nanosheets and cerium dioxide nanoparticles.

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Farouk, A., S. El-Sayed Saeed, S. Sharaf i M. M. Abd El-Hady. "Photocatalytic activity and antibacterial properties of linen fabric using reduced graphene oxide/silver nanocomposite". RSC Advances 10, nr 68 (2020): 41600–41611. http://dx.doi.org/10.1039/d0ra07544b.

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Huang, Manman, Yanyan Wang, Shuyang Ying, Zhekun Wu, Weixiao Liu, Da Chen i Changsi Peng. "Synthesis of Cu2O-Modified Reduced Graphene Oxide for NO2 Sensors". Sensors 21, nr 6 (11.03.2021): 1958. http://dx.doi.org/10.3390/s21061958.

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Nowadays, metal oxide semiconductors (MOS)-reduced graphene oxide (rGO) nanocomposites have attracted significant research attention for gas sensing applications. Herein, a novel composite material is synthesized by combining two p-type semiconductors, i.e., Cu2O and rGO, and a p-p-type gas sensor is assembled for NO2 detection. Briefly, polypyrrole-coated cuprous oxide nanowires (PPy/Cu2O) are prepared via hydrothermal method and combined with graphene oxide (GO). Then, the nanocomposite (rGO/PPy/Cu2O) is obtained by using high-temperature thermal reduction under Ar atmosphere. The results reveal that the as-prepared rGO/PPy/Cu2O nanocomposite exhibits a maximum NO2 response of 42.5% and is capable of detecting NO2 at a low concentration of 200 ppb. Overall, the as-prepared rGO/PPy/Cu2O nanocomposite demonstrates excellent sensitivity, reversibility, repeatability, and selectivity for NO2 sensing applications.

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Cuenca-Bracamonte, Quimberly, Mehrdad Yazdani-Pedram i Héctor Aguilar-Bolados. "Electrical Properties of Polyetherimide-Based Nanocomposites Filled with Reduced Graphene Oxide and Graphene Oxide-Barium Titanate-Based Hybrid Nanoparticles". Polymers 14, nr 20 (11.10.2022): 4266. http://dx.doi.org/10.3390/polym14204266.

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The electrical properties of nanocomposites based on polyetherimide (PEI) filled with reduced graphene oxide (rGO) and a graphene oxide hybrid material obtained from graphene oxide grafted with poly(monomethyl itaconate) (PMMI) modified with barium titanate nanoparticles (BTN) getting (GO-g-PMMI/BTN) were studied. The results indicated that the nanocomposite filled with GO-g-PMMI/BTN had almost the same electrical conductivity as PEI (1 × 10−11 S/cm). However, the nanocomposite containing 10 wt.% rGO and 10 wt.% GO-g-PMMI/BTN as fillers showed an electrical conductivity in the order of 1 × 10−7 S/cm. This electrical conductivity is higher than that obtained for nanocomposites filled with 10% rGO (1 × 10−8 S/cm). The combination of rGO and GO-g-PMMI/BTN as filler materials generates a synergistic effect within the polymeric matrix of the nanocomposite favoring the increase in the electrical conductivity of the system.

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N. Thangaraj, N. Joseph John i C. Gnana Sambandam. "An Improved Method of Synthesis of Graphene Oxide(GO) and Reduced Graphene Oxide(rGO) Nanocomposites". International Journal of Current Research and Review 15, nr 05 (2023): 10–15. http://dx.doi.org/10.31782/ijcrr.2023.15503.

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The oxidation and exfoliation of graphitized carbon was successfully achieved using modified Hummer’s method. Graphene is a remarkable material, electrical, thermal and barrier properties, graphene–based nanocomposites have been area of research in the past decade. Graphene possesses a large number of materials parameters such as superior mechanical stiffness, strength and elasticity, very high electrical and thermal conductivity. The synthesis and physical properties of graphene oxide and reduced graphene oxide (GO-rGO) Nanocomposite. The GO-rGO Nanocomposite was prepared by a modified Hummer’s method and then reduced using hydrazine hydrate (reducing agent) to produce rGO.XRD spectrum reveal that crystalline structure for both GO and rGO. The d-spacing is observed to be reduced for rGO as compared to that for GO because of removal of oxygen containing functional groups. The optical property was analysed using UV-vis Visible and photoluminences(PL) spectroscopy.

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Aldosari, Mohammad A., Khaled Bin Bandar Alsaud, Ali Othman, Mohammed Al-Hindawi, Nadimul Haque Faisal, Rehan Ahmed, Feven Mattwes Michael, Mohan Raj Krishnan i Edreese Asharaeh. "Microwave Irradiation Synthesis and Characterization of Reduced-(Graphene Oxide-(Polystyrene-Polymethyl Methacrylate))/Silver Nanoparticle Nanocomposites and Their Anti-Microbial Activity". Polymers 12, nr 5 (18.05.2020): 1155. http://dx.doi.org/10.3390/polym12051155.

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Herein, we report a facile process for the preparation of styrene and methyl-methacrylate copolymer nanocomposites containing reduced graphene oxide and silver nanoparticles ((R-(GO-(PS-PMMA))/AgNPs)) by using (i) microwave irradiation (MWI) to obtain R-(GO-(PS-PMMA))/AgNPs and (ii) the in situ bulk polymerization technique to produce RGO/AgNPs-(PS-PMMA). Various characterization techniques, including FT-IR, XPS, Raman spectroscopy, XRD, SEM, HR-TEM, DSC, and TGA analysis, were used to characterize the prepared nanocomposites. The Berkovich nanoindentation method was employed to determine the hardness and elastic modulus of the nanocomposites. The results showed that the MWI-produced nanocomposites were found to have enhanced morphological, structural, and thermal properties compared with those of the nanocomposites prepared by the in situ method. In addition, the antibacterial activity of the prepared nanocomposites against the E. coli HB 101 K-12 was investigated, whereby an inhibition zone of 3 mm (RGO/AgNPs-(PS-PMMA) and 27 mm (R-(GO-(PS-PMMA))/AgNPs) was achieved. This indicates that the MWI-prepared nanocomposite has stronger antibacterial activity than the in situ-prepared nanocomposite.

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Modafferi, Vincenza, Saveria Santangelo, Michele Fiore, Enza Fazio, Claudia Triolo, Salvatore Patanè, Riccardo Ruffo i Maria G. Musolino. "Transition Metal Oxides on Reduced Graphene Oxide Nanocomposites: Evaluation of Physicochemical Properties". Journal of Nanomaterials 2019 (11.04.2019): 1–9. http://dx.doi.org/10.1155/2019/1703218.

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Transition metal oxides on reduced graphene oxide (TMO@rGO) nanocomposites were successfully prepared via a very simple one-step solvothermal process, involving the simultaneous (thermal) reduction of graphene oxide to graphene and the deposition of TMO nanoparticles over its surface. Texture and morphology, microstructure, and chemical and surface compositions of the nanocomposites were investigated via scanning electron microscopy, X-ray diffraction, micro-Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. The results prove that Fe2O3@rGO, CoFe2O4@rGO, and CoO@rGO are obtained by using Fe and/or Co acetates as oxide precursors, with the TMO nanoparticles uniformly anchored onto the surface of graphene sheets. The electrochemical performance of the most promising nanocomposite was evaluated as anode material for sodium ion batteries. The preliminary results of galvanostatic cycling prove that Fe2O3@rGO nanocomposite exhibits better rate capability and stability than both bare Fe2O3 and Fe2O3+rGO physical mixture.

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Pathak, Purnendu Kumar, Anil Kumar i Bhim Bali Prasad. "A novel electrocatalytic nanocomposite of reduced graphene oxide/silver nanocube hybrid decorated imprinted polymer for ultra-trace sensing of temozolomide". New Journal of Chemistry 42, nr 16 (2018): 13486–96. http://dx.doi.org/10.1039/c8nj01824c.

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A new nanocomposite of reduced graphene oxide/silver nanocube hybrid decorated molecularly imprinted polymer at the surface of a screen-printed carbon electrode was developed for the electroanalysis of an anticancerous drug, temozolomide, at the ultra-trace level.

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Onyszko, Magdalena, Karolina Urbas, Malgorzata Aleksandrzak i Ewa Mijowska. "Reduced graphene oxide and inorganic nanoparticles composites – synthesis and characterization". Polish Journal of Chemical Technology 17, nr 4 (1.12.2015): 95–103. http://dx.doi.org/10.1515/pjct-2015-0074.

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Abstract Graphene – novel 2D material, which possesses variety of fascinating properties, can be considered as a convenient support material for the nanoparticles. In this work various methods of synthesis of reduced graphene oxide with metal or metal oxide nanoparticles will be presented. The hydrothermal approach for deposition of platinum, palladium and zirconium dioxide nanoparticles in ethylene glycol/water solution was applied. Here, platinum/reduced graphene oxide (Pt/RGO), palladium/reduced graphene oxide (Pd/RGO) and zirconium dioxide/reduced graphene oxide (ZrO2/RGO) nanocomposites were prepared. Additionally, manganese dioxide/reduced graphene oxide nanocomposite (MnO2/RGO) was synthesized in an oleic-water interface. The obtained nanocomposites were investigated by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Raman spectroscopy and thermogravimetric analysis (TGA). The results shows that GO can be successfully used as a template for direct synthesis of metal or metal oxide nanoparticles on its surface with a homogenous distribution.

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Liao, Jianming, Shuaiming He, Shasha Guo, Pengcheng Luan, Lihuan Mo i Jun Li. "Antibacterial Performance of a Mussel-Inspired Polydopamine-Treated Ag/Graphene Nanocomposite Material". Materials 12, nr 20 (15.10.2019): 3360. http://dx.doi.org/10.3390/ma12203360.

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Graphene-based nanocomposites have attracted tremendous attention in recent years. In this study, a facile yet effective approach was developed to synthesize reduced graphene oxide and an Ag–graphene nanocomposite. The basic strategy involved in the preparation of reduced graphene oxide includes reducing graphene oxide with dopamine, followed by in situ syntheses of the Ag-PDA-reducing graphene oxide (RGO) nanocomposite through adding AgNO3 solution and a small amount of dopamine. The nanocomposite was characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), FTIR spectra, Raman spectra, ultraviolet-visible (UV-vis), and X-ray photoelectron spectroscopy (XPS), results indicated that a uniform PDA film is formed on the surface of the GO and GO is successfully reduced. Besides, the in situ synthesized Ag nanoparticles (AgNPs) were evenly distributed on the RGO surface. To investigate antibacterial properties Ag-PDA-RGO, different dosages were selected for evaluating the antibacterial activity against Gram-positive bacteria Staphylococcus aureus and Gram-negative bacteria Escherichia coli. The Ag-PDA-RGO nanocomposites displayed excellent antibacterial property. The antibacterial ratio reached 99.9% against S. aureus and 90.9% against E. coli when the dosage of 100 mg/L Ag-PDA-RGO nanocomposites was 100 μL. The novel Ag-PDA-RGO nanocomposite prepared by a facile yet effective, environmentally friendly, and low-cost method holds great promise in a wide range of modern biomedical applications.

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Kumar, Vijay, Rajeev Kumar Gupta, Ravi Kumar Gundampati, Devendra Kumar Singh, Sweta Mohan, Syed Hadi Hasan i Manisha Malviya. "Enhanced electron transfer mediated detection of hydrogen peroxide using a silver nanoparticle–reduced graphene oxide–polyaniline fabricated electrochemical sensor". RSC Advances 8, nr 2 (2018): 619–31. http://dx.doi.org/10.1039/c7ra11466d.

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The current study aims at the development of an electrochemical sensor based on a silver nanoparticle–reduced graphene oxide–polyaniline (AgNPs–rGO–PANI) nanocomposite for the sensitive and selective detection of hydrogen peroxide (H₂O₂).

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Strankowski, Michał, Damian Włodarczyk, Łukasz Piszczyk i Justyna Strankowska. "Polyurethane Nanocomposites Containing Reduced Graphene Oxide, FTIR, Raman, and XRD Studies". Journal of Spectroscopy 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/7520741.

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Recently, graphene and other graphene-based materials have become an essential part of composite science and technology. Their unique properties are not only restricted to graphene but also shared with derivative compounds like graphene oxide, reduced graphene oxide, functionalized graphene, and so forth. One of the most structurally important materials, graphene oxide (GO), is prepared by the oxidation of graphite. Though removal of the oxide groups can create vacancies and structural defects, reduced graphene oxide (rGO) is used in composites as effective filler similar to GO. Authors developed a new polyurethane nanocomposite using a derivative of grapheme, thermally reduced graphene oxide (rGO), to modify the matrix of polyurethane elastomers, by rGO.

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Nguyen, Vy Tuong, Trung Lap Huynh, Tam Thanh Mai i Huy Thuc Ha. "Graphene synthesis by hydrazine and reduced thermal expansion graphite oxide and application in the preparation of nano-composite PMMA/graphene". Science and Technology Development Journal 19, nr 4 (31.12.2016): 214–26. http://dx.doi.org/10.32508/stdj.v19i4.622.

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By in situ emulsion method to prepare polymethyl metaacrylate (PMMA) and graphene nanocomposite materials showed remarkable properties: the in glass transition temperature was increased from 5-80 0C, the decomposition temperature was 50 0C higher, the stiffness is 46 % higher compared to the pure PMMA. The reduction of exfoliated graphene oxide in TGO-PMMA nanocomposite after synthesis by hydrazine is more effective than the reduction of graphene oxide into graphene and then synthesizing the nanocomposite with PMMA. There are some differences in the structure and morphology of two nanocomposite samples (SEM and TEM) synthesized by these two methods, leading differences in their properties, as well as the original pure PMMA. These results open up new potential for the application of graphene and resulted nanocomposites.

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Pandey, Pratima, Rajashree Sahoo, Khusbu Singh, Sanghamitra Pati, Jose Mathew, Avinash Chandra Pandey, Rajni Kant i in. "Drug Resistance Reversal Potential of Nanoparticles/Nanocomposites via Antibiotic’s Potentiation in Multi Drug Resistant P. aeruginosa". Nanomaterials 12, nr 1 (30.12.2021): 117. http://dx.doi.org/10.3390/nano12010117.

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Bacteria employ numerous resistance mechanisms against structurally distinct drugs by the process of multidrug resistance. A study was planned to discover the antibacterial potential of a graphene oxide nanosheet (GO), a graphene oxide–zinc oxide nanocomposite (GO/ZnO), a graphene oxide-chitosan nanocomposite (GO–CS), a zinc oxide decorated graphene oxide–chitosan nanocomposite (GO–CS/ZnO), and zinc oxide nanoparticles (ZnO) alone and in a blend with antibiotics against a PS-2 isolate of Pseudomonas aeruginosa. These nanocomposites reduced the MIC of tetracycline (TET) from 16 folds to 64 folds against a multidrug-resistant clinical isolate. Efflux pumps were interfered, as evident by an ethidium bromide synergy study with nanocomposites, as well as inhibiting biofilm synthesis. These nanoparticles/nanocomposites also decreased the mutant prevention concentration (MPC) of TET. To the best of our knowledge, this is the first report on nanomaterials as a synergistic agent via inhibition of efflux and biofilm synthesis.

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Rakkimuthu, R., S. Aarthi, E. Neelamathi, P. Sathishkumar, A. M. Anandakumar i D. Sowmiya. "GREEN SYNTHESIS OF REDUCED GRAPHENE OXIDE SILVER NANOCOMPOSITE USING Anisomeles malabarica (L.) R. BR. LEAF EXTRACT AND ITS ANTIBACTERIAL ACTIVITY". Rasayan Journal of Chemistry 15, nr 01 (2022): 417–22. http://dx.doi.org/10.31788/rjc.2022.1516786.

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The development of new antimicrobial materials has arisen in response to the need to prevent and control the growth of pathogenic microorganisms without the use of antibiotics. The Silver (Ag) nanoparticles attached r-GO (rGO/Ag) nanocomposite was synthesised in the present work using a one-pot in-situ chemical reduction approach and studied for antibacterial property. We developed a rapid preparation of graphene from graphite using modified Hummers method and reduced by A. malabarica leaf extract. UV-Vis spectroscopy and FT-IR were used to characterize the synthesized GO and rGO–Ag nanocomposite. The antibacterial properties of the synthesized GO and rGo-Ag nanocomposite were evaluated against human pathogenic organisms like Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae and Staphylococcus aureus using agar well diffusion method. At 50µl concentrations, synthesised GO inhibited Pseudomonas aeruginosa (19 mm) and rGO-Ag nanocomposite inhibited Staphylococcusaureus (28 mm).Antibacterial properties of the nanocomposites were found to be efficient against both gram positive and gram negative bacteria. Thus, green synthesized RGO-supported Silver nanoparticles play an important role in the medical disciplines.

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Cobos, Mónica, Iker De-La-Pinta, Guillermo Quindós, María Jesús Fernández i María Dolores Fernández. "Synthesis, Physical, Mechanical and Antibacterial Properties of Nanocomposites Based on Poly(vinyl alcohol)/Graphene Oxide–Silver Nanoparticles". Polymers 12, nr 3 (24.03.2020): 723. http://dx.doi.org/10.3390/polym12030723.

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The design of new materials with antimicrobial properties has emerged in response to the need for preventing and controlling the growth of pathogenic microorganisms without the use of antibiotics. In this study, partially reduced graphene oxide decorated with silver nanoparticles (GO–AgNPs) was incorporated as a reinforcing filler with antibacterial properties to poly(vinyl alcohol) (PVA) for preparation of poly(vinyl alcohol)/graphene oxide-silver nanoparticles nanocomposites (PVA/GO–AgNPs). AgNPs, spherical in shape and with an average size of 3.1 nm, were uniformly anchored on the partially reduced GO surface. PVA/GO–AgNPs nanocomposites showed exfoliated structures with improved thermal stability, tensile properties and water resistance compared to neat PVA. The glass transition and crystallization temperatures of the polymer matrix increased with the incorporation of the hybrid. The nanocomposites displayed antibacterial activity against Staphylococcus aureus and Escherichia coli in a filler content- and time-dependent manner. S. aureus showed higher susceptibility to PVA/GO–AgNPs films than E. coli. Inhibitory activity was higher when bacterial cells were in contact with nanocomposite films than when in contact with leachates coming out of the films. GO–AgNPs based PVA nanocomposites could find application as wound dressings for wound healing and infection prevention.

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Lee, Yeon-Ju, Tae-Hyun Ha, Gyu-Bong Cho, Ki-Won Kim, Jou-Hyeon Ahn i Kwon-Koo Cho. "Fabrication of Nickel Sulfide/Nitrogen-Doped Reduced Graphene Oxide Nanocomposite as Anode Material for Lithium-Ion Batteries and Its Electrochemical Performance". Journal of Nanoscience and Nanotechnology 20, nr 11 (1.11.2020): 6782–87. http://dx.doi.org/10.1166/jnn.2020.18783.

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In this study, NiS/graphene nanocomposites were synthesized by simple heat treatment method of three graphene materials (graphene oxide (GO), reduced graphene oxide (rGO) and nitrogen-doped graphene oxide (N-rGO)) and NiS precursor. The morphology and crystal structure of NiS/graphene nanocomposites were characterized using field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Electrochemical properties were also investigated. NiS/graphene nanocomposites homogeneously wrapped by graphene materials have been successfully manufactured. Among the three nanocomposites, NiS/N-rGO nanocomposite exhibited the highest initial and retention capacity in discharge, respectively, of 1240 mAh/g and 467 mAh/g up to 100 cycles at 0.5 C.

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Kanabenja, Warrayut, i Pranut Potiyaraj. "Graphene/Thermoplastic Polyurethane Composites". Key Engineering Materials 773 (lipiec 2018): 77–81. http://dx.doi.org/10.4028/www.scientific.net/kem.773.77.

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Thermoplastic polyurethane/graphene nanocomposites were successfully prepared by mixing masterbatches with neat polymers using the melt compounding process. Graphene was obtained from graphite by the chemical mean. Graphite was initially converted into graphite oxide which was then converted to graphene oxide. Graphene oxide was then reduced by L-ascorbic acid to obtain graphene. The effects of graphene addition on thermal and morphological properties of nanocomposite were studied by a differential scanning calorimeter, a thermal gravimetric analyzer and a scanning electron microscope. TPU/graphene nanocomposites showed higher melting temperature compared to TPU. On the other hand, heat of fusion of nanocomposites was lowered. TPU and TPU/graphene nanocomposites have two steps of decomposition. The first degradation of TPU occurred at higher temperature compared with nanocomposites but the second degradation showed the opposite results. The percentage of residue after thermal degradation of nanocomposites was lower than that of TPU. For surface morphology, nanocomposite exhibited the rougher surface comparing with TPU and well graphene dispersion in TPU phase was achieved. Nevertheless, there were some agglomeration of graphene.

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Patil, Ashwini G. "Facile one pot microbe-mediated in situ synthesis and antibacterial activity of reduced graphene oxide-silver nanocomposite". Nanotechnology 33, nr 13 (7.01.2022): 135603. http://dx.doi.org/10.1088/1361-6528/ac4521.

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Abstract The present research deals with the development of a novel bioinspired in situ fabrication of reduced graphene oxide (rGO)-silver nanoparticle (AgNPs) nanocomposite (rGO@AgNCs) using microbes namely Pseudomonas aeruginosa (PA) and Staphylococcus aureus (SA). The fabricated rGO@AgNCs were characterized using Ultraviolet-visible (UV–Vis) spectroscopy, Fourier-transform infrared spectroscopy (FTIR), particle size analysis, polydispersity index (PDI), zeta potential analysis, energy dispersive x-ray analysis (EDAX), Raman spectroscopy, powder x-ray diffraction (PXRD), high-resolution transmission electron microscopy (HR-TEM) analysis, etc. Furthermore, the rGO@AgNCs-PA and rGO@AgNCs-SA interaction with serum protein, pH stability study, and in vitro dissolution of AgNPs were also performed. The research findings of the proposed study demonstrated the simultaneous reduction of graphene oxide (GO) and AgNPs and the formation of rGO@AgNCs in the presence of microbes. The in vitro dissolution studies of rGO@AgNCs composites showed better AgNPs dissolution with controlled release and offered remarkable matrix integrity throughout the dissolution period. The size and stability of rGO@AgNCs-PA and rGO@AgNCs-SA had no significant changes at physiological pH 7.4. A minimal decrease in the zeta potential of rGO@AgNCs was observed, which may be due to the weak interaction of nanocomposites and albumin. The antibacterial application of the synthesized nanocomposite was evaluated against a pathogenic mastitis-forming bacterium. The obtained results suggested an admirable antibacterial activity of synthesized nanocomposites against the tested microbes. This knowledge will assist the scientific fraternity in designing novel antibacterial agents with enhanced antibacterial activity against various veterinary pathogens in near future.

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Naeem, Hina, Hafiz Muhammad Tofil, Mohamed Soliman, Abdul Hai, Syeda Huma H. Zaidi, Nadeem Kizilbash, Daliyah Alruwaili, Muhammad Ajmal i Muhammad Siddiq. "Reduced Graphene Oxide-Zinc Sulfide Nanocomposite Decorated with Silver Nanoparticles for Wastewater Treatment by Adsorption, Photocatalysis and Antimicrobial Action". Molecules 28, nr 3 (17.01.2023): 926. http://dx.doi.org/10.3390/molecules28030926.

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Reduced graphene oxide nanosheets decorated with ZnS and ZnS-Ag nanoparticles are successfully prepared via a facile one-step chemical approach consisting of reducing the metal precursors on a rGO surface. Prepared rGO-ZnS nanocomposite is employed as an adsorbent material against two model dyes: malachite green (MG) and ethyl violet (EV). The adsorptive behavior of the nanocomposite was tuned by monitoring some parameters, such as the time of contact between the dye and the adsorbent, and the adsorbent dose. Experimental data were also simulated with kinetic models to evaluate the adsorption behavior, and the results confirmed that the adsorption of both dyes followed a pseudo 2nd order kinetic mode. Moreover, the adsorbent was also regenerated in a suitable media for both dyes (HCl for MG and ethanol for EV), without any significant loss in removal efficiency. Ag doped rGO-ZnS nanocomposite was also utilized as a photocatalyst for the degradation of the selected organic contaminant, resorcinol. The complete degradation of the phenolic compound was achieved after 60 min with 200 mg of rGO-ZnS-Ag nanocomposite under natural sunlight irradiation. The photocatalytic activity was studied considering some parameters, such as the initial phenol concentration, the photocatalyst loading, and the pH of the solution. The degradation kinetics of resorcinol was carefully studied and found to follow a linear Langmuir–Hinshelwood model. An additional advantage of rGO-ZnS and rGO-ZnS-Ag nanocomposites was antibacterial activity against Gram-negative bacterium, E. coli, and the results confirmed the significant performance of the nanocomposites in destroying harmful pathogens.

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Zhang, Yanli, Hongjun Liu, Zhongming Yang, Shunlin Ji, Junfang Wang, Pengfei Pang, Lili Feng, Hongbin Wang, Zhan Wu i Wenrong Yang. "An acetylcholinesterase inhibition biosensor based on a reduced graphene oxide/silver nanocluster/chitosan nanocomposite for detection of organophosphorus pesticides". Analytical Methods 7, nr 15 (2015): 6213–19. http://dx.doi.org/10.1039/c5ay01439e.

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Xu, Xuan, Qiulin Zou, Yunsong Yuan, Fangying Ji, Zihong Fan i Bi Zhou. "Preparation of BiVO4-Graphene Nanocomposites and Their Photocatalytic Activity". Journal of Nanomaterials 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/401697.

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We prepared BiVO4-graphene nanocomposites by using a facile single-step method and characterized the material by x-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, ultraviolet-visible diffuse-reflection spectroscopy, and three-dimensional fluorescence spectroscopy. The results show that graphene oxide in the catalyst was thoroughly reduced. The BiVO4is densely dispersed on the graphene sheets, which facilitates the transport of electrons photogenerated in BiVO4, thereby leading to an efficient separation of photogenerated carriers in the coupled graphene-nanocomposite system. For degradation of rhodamine B dye under visible-light irradiation, the photocatalytic activity of the synthesized nanocomposites was over ∼20% faster than for pure BiVO4catalyst. To study the contribution of electrons and holes in the degradation reaction, silver nitrate and potassium sodium tartrate were added to the BiVO4-graphene photocatalytic reaction system as electron-trapping agent and hole-trapping agent, respectively. The results show that holes play the main role in the degradation of rhodamine B.

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Jacovone, Raynara M. S., Jaqueline J. S. Soares, Thainá S. Sousa, Flávia R. O. Silva, Rafael H. L. Garcia, Hang N. Nguyen, Debora F. Rodrigues i Solange K. Sakata. "Antibacterial activity of silver/reduced graphene oxide nanocomposite synthesized by sustainable process". Energy, Ecology and Environment 4, nr 6 (22.10.2019): 318–24. http://dx.doi.org/10.1007/s40974-019-00136-3.

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Elshypany, Rania, Hanaa Selim, K. Zakaria, Ahmed H. Moustafa, Sadeek A. Sadeek, S. I. Sharaa, Patrice Raynaud i Amr A. Nada. "Magnetic ZnO Crystal Nanoparticle Growth on Reduced Graphene Oxide for Enhanced Photocatalytic Performance under Visible Light Irradiation". Molecules 26, nr 8 (14.04.2021): 2269. http://dx.doi.org/10.3390/molecules26082269.

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Magnetite zinc oxide (MZ) (Fe3O4/ZnO) with different ratios of reduced graphene oxide (rGO) was synthesized using the solid-state method. The structural and optical properties of the nanocomposites were analyzed using transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis/DRS), and photoluminescence (PL) spectrophotometry. In particular, the analyses show higher photocatalytic movement for crystalline nanocomposite (MZG) than MZ and ZnO nanoparticles. The photocatalytic degradation of methylene blue (MB) with crystalline ZnO for 1.5 h under visible light was 12%. By contrast, the photocatalytic activity for MZG was more than 98.5%. The superior photocatalytic activity of the crystalline nanocomposite was detected to be due to the synergistic effect between magnetite and zinc oxide in the presence of reduced graphene oxide. Moreover, the fabricated nanocomposite had high electron–hole stability. The crystalline nanocomposite was stable when the material was used several times.

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Yilmaz Dogan, Hazal, Yasin Altin i Ayşe Çelik Bedeloğlu. "Fabrication and properties of graphene oxide and reduced graphene oxide reinforced Poly(Vinyl alcohol) nanocomposite films for packaging applications". Polymers and Polymer Composites 30 (styczeń 2022): 096739112211133. http://dx.doi.org/10.1177/09673911221113328.

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Petroleum-based polymers have a wide range of uses in the packaging industry, including films, food packaging, rigid containers, foamed containers, medical products, etc. This study focuses on improving the properties of polyvinyl alcohol (PVA) based material systems, one of the most popular water-soluble biopolymers, to reduce the waste of petroleum-based plastics, which are widely used. Polyvinyl alcohol (PVA) nanocomposite films containing low concentrations (0.05–1%) of graphene oxide (GO) and reduced graphene oxide (rGO) were produced via the solution casting method. When electrical properties of nanocomposite films were evaluated, the addition of 1 wt% GO and rGO resulted in a 36% and 45% decrease in the volumetric resistance of the films as well as a decrease in surface resistance of 24.5% and 34.9%, respectively. The maximum tensile strength of 1% GO and rGO-reinforced PVA nanocomposites was found to be ∼59 MPa and ∼68 MPa with an increase of 20% and 38% compared to neat PVA films, respectively. The average Young’s modulus of 1% GO and rGO-reinforced PVA nanocomposites also increased from 2561 MPa to 3515 MPa and 4219 MPa with an increase of 37% and 65%, respectively. As a result, the electrical conductivity, Young’s modulus, maximum tensile strength, thermal properties, and optical absorption of nanocomposite films increased by adding GO and rGO to PVA. The results show that the produced nanocomposite film may be a promising material for packaging applications.

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Hwa, Kuo-Yuan, Tata Sanjay Kanna Sharma i Anindita Ganguly. "Design strategy of rGO–HNT–AgNPs based hybrid nanocomposite with enhanced performance for electrochemical detection of 4-nitrophenol". Inorganic Chemistry Frontiers 7, nr 10 (2020): 1981–94. http://dx.doi.org/10.1039/d0qi00006j.

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Niasar, Mojtaba Moslehi, Mohammad Jafar Molaei i Alireza Aghaei. "Microwave absorption properties of Zn-doped barium ferrite (BaFe12-x Zn x O19) decorated reduced graphene oxide". International Journal of Materials Research 112, nr 6 (1.05.2021): 465–73. http://dx.doi.org/10.1515/ijmr-2020-8073.

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Abstract Reduced graphene oxide has attracted great interest for application as microwave absorbing materials during recent years. Barium ferrite (BaFe12O19) is also a hard magnetic material with microwave absorbing properties. In this research, Zn-doped barium ferrite/reduced graphene oxide nanocomposites were synthesized and their magnetic and microwave absorption properties were studied. Phase analysis, particle morphology, magnetic properties, and microwave absorption properties were investigated by means of X-ray diffraction, field-emission scanning electron microscopy, vibrating sample magnetometry, and vector network analysis, respectively. Electron microscopy images showed that reduced graphene oxide nanosheets are decorated with barium ferrite nanoparticles. Zn-doping in the reduced graphene oxide/BaFe12-x Zn x O19 (x = 0.0, 0.2, 0.4, and 0.6) nanocomposites caused an increase in the saturation magnetization from 30.76 to 32.69 emu g–1 for Zn = 0.4. Maximum reflection loss was increased from –7.39 dB to –13.50 dB by Zn doping for x = 0.4 in the nanocomposite consisting of 10 wt.% of reduced graphene oxide/BaZn0.4Fe11.6O19. The microwave absorption characteristics are discussed based on the permittivity and permeability values of the nanocomposites.

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Roy, Indranil, Dipak Rana, Gunjan Sarkar, Amartya Bhattacharyya, Nayan Ranjan Saha, Soumya Mondal, Sutanuka Pattanayak, Sanatan Chattopadhyay i Dipankar Chattopadhyay. "Physical and electrochemical characterization of reduced graphene oxide/silver nanocomposites synthesized by adopting a green approach". RSC Advances 5, nr 32 (2015): 25357–64. http://dx.doi.org/10.1039/c4ra16197a.

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Rañola, Rey Alfred G., Justine M. Kalaw i Fortunato B. Sevilla. "Graphene/Nylon-6 Chemiresistor Sensor for Trimethylamine Gas Sensing". Applied Mechanics and Materials 492 (styczeń 2014): 321–25. http://dx.doi.org/10.4028/www.scientific.net/amm.492.321.

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A graphene/nylon-6 nanocomposite was fabricated by incorporating reduced graphene oxide onto a nylon-6 (N6) membrane via vacuum assisted self-assembly (VASA) method. The graphene oxide was synthesised through acid dissolution according to the method of Marcano & Tour and subsequently reduced to graphene using L-ascorbic acid. The surface morphology and electrical characteristic of graphene and its nanocomposites was characterized. The percolation threshold of the prepared nanocomposites was around 1.92% (w/w) with a sheet resistance of 3.839 x 103Ω per square (rsd= 0.22%, n=4). Different weight ratios of the nanocomposite were tested for its sensitivity towards the amine vapour. The final sensor for trimethylamine concentration has a working concentration range between 23 and 230 mg/L. The sensor exhibited linearity between 45 to 230 mg/L (r2= 0.9917) while the detection and quantitation limit was calculated at 0.39 mg/L and 1.30 mg/L, respectively. This nanocomposite demonstrates that it can be used as a chemiresistor gas sensor that is sensitive and selective to trimethylamine vapour.

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Mun, Wai Hong, Noramirulikram Abdul Halim, Fatema Khatun i Azrina Abd Aziz. "Ag/RGO Photocatalyst for Methyl Orange Treatment". Materials Science Forum 1056 (14.03.2022): 119–25. http://dx.doi.org/10.4028/p-80g73u.

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In present study, a simple chemical method for the synthesis of silver-reduced graphene oxide (AG/RGO) nanocomposite was reported. The objective is to evaluate the performance of AG/RGO in photocatalytic degradation activity of methyl orange (MO) under artificial visible light source. The synthesized catalyst was then characterized using field emissions scanning electron microscope with energy dispersive X-Ray spectroscope (FESEM-EDX), photoluminescence spectroscopy (PL) and UV-visible spectroscope (UV-VIS) to determine the morphology, physical and chemical composition of the photocatalyst. The characterization results show the synthesized catalyst possess nanometre dimension silver nanoparticles (AgNPs) were deposited on reduced graphene oxide sheets. The photocatalytic activity of 0.3 g AG/RGO obtained through the degradation of 5 mg/l MO is 93.74% with a degradation rate of 3.1 × 10-2 min-1.

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Omar, Fatin Saiha, Huang Nay Ming, Syed Muhamad Hafiz i Lim Hong Ngee. "Microwave Synthesis of Zinc Oxide/Reduced Graphene Oxide Hybrid for Adsorption-Photocatalysis Application". International Journal of Photoenergy 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/176835.

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This work reports on synthesis of zinc oxide/reduced graphene oxide (ZnO/rGO) nanocomposites in the presence of diethylenetriamine (DETA) via a facile microwave method. The X-ray diffraction (XRD) patterns of the nanocomposites correspond to the ZnO hexagonal phase wurtzite structure. The high-resolution transmission electron microscopy (HRTEM) images revealed that the ZnO nanorods, with an average length : diameter ratio of 10, were successfully deposited on the rGO sheets. Under the irradiation of sunlight, the nanocomposites showed enhanced adsorption-photocatalysis by more than twofold and photocurrent response by sixfold compared to the ZnO. The excellent photoactivity performance of the nanocomposites is contributed by smaller ZnO nanorod and the presence of rGO that acts as a photosensitizer by transferring electrons to the conduction band of ZnO within the nanocomposite during sunlight illumination.

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Li, Shin-Ming, Yu-Sheng Wang, Sheng-Tsung Hsiao, Wei-Hao Liao, Chi-Wen Lin, Shin-Yi Yang, Hsi-Wen Tien, Chen-Chi M. Ma i Chi-Chang Hu. "Fabrication of a silver nanowire-reduced graphene oxide-based electrochemical biosensor and its enhanced sensitivity in the simultaneous determination of ascorbic acid, dopamine, and uric acid". Journal of Materials Chemistry C 3, nr 36 (2015): 9444–53. http://dx.doi.org/10.1039/c5tc01564b.

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Du, Yong, Jia Li, Jiayue Xu i Per Eklund. "Thermoelectric Properties of Reduced Graphene Oxide/Bi2Te3 Nanocomposites". Energies 12, nr 12 (24.06.2019): 2430. http://dx.doi.org/10.3390/en12122430.

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Reduced graphene oxide (rGO)/Bi2Te3 nanocomposite powders with different contents of rGO have been synthesized by a one-step in-situ reductive method. Then, rGO/Bi2Te3 nanocomposite bulk materials were fabricated by a hot-pressing process. The effect of rGO contents on the composition, microstructure, TE properties, and carrier transportation of the nanocomposite bulk materials has been investigated. All the composite bulk materials show negative Seebeck coefficient, indicating n-type conduction. The electrical conductivity for all the rGO/Bi2Te3 nanocomposite bulk materials decreased with increasing measurement temperature from 25 °C to 300 °C, while the absolute value of Seebeck coefficient first increased and then decreased. As a result, the power factor of the bulk materials first increased and then decreased, and a power factor of 1340 μWm−1K−2 was achieved for the nanocomposite bulk materials with 0.25 wt% rGO at 150 °C.

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Thakur, Suman, i Niranjan Karak. "Multi-stimuli responsive smart elastomeric hyperbranched polyurethane/reduced graphene oxide nanocomposites". J. Mater. Chem. A 2, nr 36 (2014): 14867–75. http://dx.doi.org/10.1039/c4ta02497d.

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Algethami, Merfat. "Bismuth/bismuth oxide-incorporated reduced graphene oxide nanocomposite: synthesis, characterisation, and photocatalytic activity". Materials Research Express 9, nr 2 (1.02.2022): 025001. http://dx.doi.org/10.1088/2053-1591/ac4ebb.

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Abstract This study loaded Bi/Bi2O3 on the surface of reduced graphene oxide (rGO) to perform a two-step facile synthesis of rGO@Bi/Bi2O3 as a bismuth-based nanocomposite. First, Bi/Bi2O3 nanocomposites were synthesised via a solvothermal process using Bi(NO3)3 5H2O as the Bi3+ precursor and dimethyl sulfoxide (DMSO) as the solvent. Second, we exfoliated rGO in water to functionalise Bi/Bi2O3 with a few layers of rGO. Obtained nanocomposites were characterised with scanning electron microscopy and X-ray diffraction. We also measured the nanocomposites’ photocatalytic activity using cationic dyes, specifically methylene blue (MB) and rhodamine B (RhB). Additionally, ultraviolet-visible spectroscopy was used to determine the optical properties of rGO@Bi/Bi2O3. Photodegradation was recorded under differing durations of exposure to visible light. Reaction rates were recorded at 14.6 × 10–4 min−1 and 22.2 × 10–3 min−1 for MB and RhB, respectively, while photodegradation efficiency was logged at 17% and 81%.

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Minář, Jaroslav, Jan Doležal i Jiří Brožek. "The effect of nanocomposite synthesis and the drying procedure of graphene oxide dispersion on the polycaprolactone/graphene oxide nanocomposite properties". Polymers and Polymer Composites 30 (styczeń 2022): 096739112110689. http://dx.doi.org/10.1177/09673911211068923.

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In this work, we compare how the properties of polycaprolactone (PCLO) nanocomposites are affected by the method of nanocomposite synthesis and the differences in graphene oxide (GO) properties. PCLO nanocomposites with freeze-dried or hot-dried graphene oxide (FGO/HGO) were synthesized by in situ polymerization and melt mixing. The PCLO molar masses remained constant during melt mixing, but they were significantly reduced with increasing amount of GOs during in situ polymerization. Despite this fact, the in situ polymerized nanocomposites showed enhancement in Young modulus up to 45%, compared to only 10% modulus increase of melt-mixed nanocomposites. This was attributed to the higher crystallinity and the higher level of nanofiller dispersion and exfoliation in in situ polymerized nanocomposites. When comparing the effect of FGO and HGO on nanocomposites properties, the improved dispersion and ameliorated mechanical properties were observed for the former one.

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Ansari, Akhalakur Rahman, Sajid Ali Ansari, Nazish Parveen, Mohammad Omaish Ansari i Zurina Osman. "Silver Nanoparticles Embedded on Reduced Graphene Oxide@Copper Oxide Nanocomposite for High Performance Supercapacitor Applications". Materials 14, nr 17 (3.09.2021): 5032. http://dx.doi.org/10.3390/ma14175032.

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In this work, silver (Ag) decorated reduced graphene oxide (rGO) coated with ultrafine CuO nanosheets (Ag-rGO@CuO) was prepared by the combination of a microwave-assisted hydrothermal route and a chemical methodology. The prepared Ag-rGO@CuO was characterized for its morphological features by field emission scanning electron microscopy and transmission electron microscopy while the structural characterization was performed by X-ray diffraction and Raman spectroscopy. Energy-dispersive X-ray analysis was undertaken to confirm the elemental composition. The electrochemical performance of prepared samples was studied by cyclic voltammetry and galvanostatic charge-discharge in a 2M KOH electrolyte solution. The CuO nanosheets provided excellent electrical conductivity and the rGO sheets provided a large surface area with good mesoporosity that increases electron and ion mobility during the redox process. Furthermore, the highly conductive Ag nanoparticles upon the rGO@CuO surface further enhanced electrochemical performance by providing extra channels for charge conduction. The ternary Ag-rGO@CuO nanocomposite shows a very high specific capacitance of 612.5 to 210 Fg−1 compared against rGO@CuO which has a specific capacitance of 375 to 87.5 Fg−1 and the CuO nanosheets with a specific capacitance of 113.75 to 87.5 Fg−1 at current densities 0.5 and 7 Ag−1, respectively.

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Manikandan, Venkatachalam, Ramakrishnan Elancheran, Palanisamy Revathi, Umapathy Vanitha, Palani Suganya i Kuppusamy Krishnasamy. "Synthesis, Characterization, Photocatalytic and Electrochemical Studies of Reduced Graphene Oxide Doped Nickel Oxide Nanocomposites". Asian Journal of Chemistry 33, nr 2 (2021): 411–22. http://dx.doi.org/10.14233/ajchem.2021.22979.

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Elimination of organic pollutants from waste waters under the sunlight irradiation is a venerable challenge in the fields of environmental and materials science. This work aims to the fabrication of novel self-assembled, controlled rGO@NiO nanocomposite using eco-friendly simple co-precipitation method. The crystallite size, morphology and optical properties of the rGO, NiO and rGO@NiO were characterized using TG/DTA, FTIR, UV, XRD, SEM with EDAX and TEM techniques. The optical bandgap of the pure NiO, rGO and rGO@NiO nanocomposites was estimated as 3.75, 5.43 and 3.64 eV, respectively. Hence rGO@NiO nanocomposite might be considered as a semi-conductor and can be utilized as a photocatalyst. The photocatalytic activity of prepared rGO@NiO nanocomposite was evaluated by using rhodamine B and methyl violet dyes. The degradation results revealed that almost 90% of dye degradation is carried out within a period of 60 min. The cyclic voltammetry studies indicated that the prepared rGO@NiO nanomaterials exhibited appreciable super capacitance value (233 F g-1) at a current density of 1 A g-1.

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Reddy, K. M., i Goswami Kajal. "Synthesis of rGO layered Zn-Ti/Nb2O5 nanocomposite and its type for enhanced photocatalysis". i-manager's Journal on Material Science 9, nr 4 (2022): 23. http://dx.doi.org/10.26634/jms.9.4.18524.

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This paper presents the preparation of zinc oxide with titanium over the niobium oxide coated with graphene oxide and this new material has applications in the photocatalysis and energy storage of reduced graphene oxide layered zinc, titanium, and niobium oxide nanocomposite. The PXRD pattern confirms the unique physical and chemical characteristics of metal nanocomposites useful for catalysis. Recyclable nanocomposites are indeed helping a new era of research into future energy storage materials. To prove the important properties of such materials, researchers are always trying to find new ways to produce such polymer-based materials, but metal-based nanocomposites do show better and reusable materials and act as energy storage.

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Wei, Shanshan, Leyu Wang, Mulin Yu, Xiangyang Xu i Xianhong Chen. "Hydrothermal Synthesis of Reduced Graphene Oxide/Silver Nanocomposite Without Addition of Reducing Agent". Journal of Bionanoscience 8, nr 4 (1.08.2014): 298–301. http://dx.doi.org/10.1166/jbns.2014.1228.

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Chen, Long, Zhi Li i Mingguang Chen. "Facile production of silver-reduced graphene oxide nanocomposite with highly effective antibacterial performance". Journal of Environmental Chemical Engineering 7, nr 3 (czerwiec 2019): 103160. http://dx.doi.org/10.1016/j.jece.2019.103160.

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Sharma, Neha, Sathish Panneer Selvam i Kyusik Yun. "Electrochemical detection of amikacin sulphate using reduced graphene oxide and silver nanoparticles nanocomposite". Applied Surface Science 512 (maj 2020): 145742. http://dx.doi.org/10.1016/j.apsusc.2020.145742.

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