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Coated reduced graphene Oxide

Yayuan Liu, Hongbo Geng, Edison Huixiang Ang, Xueqin Cao, Junwei Zheng, Hongwei Gu
Nanostructured hybrid metal sulfides have attracted intensive attention due to their fascinating properties that are unattainable by the single-phased counterpart. Herein, we report an efficient approach to construct cobalt sulfide/molybdenum disulfide (Co9 S8 /MoS2 ) wrapped with reduced graphene oxide (rGO). The unique structures constructed by ultrathin nanosheets and synergetic effects benefitting from bimetallic sulfides provide improved lithium ions reaction kinetics, and they retain good structural integrity...
December 10, 2018: Chemistry, An Asian Journal
Claudio H B Silva, Maria Iliut, Christopher Muryn, Christian Berger, Zachary Coldrick, Vera R L Constantino, Marcia L A Temperini, Aravind Vijayaraghavan
Nanostructured systems, such as nanocomposites, are potential materials for usage in different fields since synergistic effects of their components at the nanoscale domain may improve physical/chemical properties when compared to individual phases. We report here the preparation and characterisation of a new nanocomposite composed of polyaniline (PANI), reduced graphene oxide (rGO) and hexaniobate (hexNb) nanoscrolls. Atomic force microscopy images show an interesting architecture of rGO flakes coated with PANI and decorated by hexNb...
2018: Beilstein Journal of Nanotechnology
Haochen Si, Li Sun, Yu Zhang, Yuanxing Zhang, Liqi Bai, Yihe Zhang
A carbon-coated molybdenum dioxide-reduced graphene oxide (RGO@MoO2/C) composite was synthesized as a high-performance electrode for supercapacitors via a facile hydrothermal method. In this composite, RGO not only provided high conductivity to benefit effective electron transfer, but also offered nucleation sites to load in situ formed MoO2/C nanoparticles. The MoO2@C nanoparticles interconnected with each other forming nanoclusters and were anchored uniformly on RGO sheets instead of self-agglomerating into large aggregates...
December 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Huan You, Zhaode Mu, Min Zhao, Jing Zhou, Yongjie Chen, Lijuan Bai
This work describes a voltammetric and ultrasensitive aptasensor for sulfadimethoxine (SDM). It is based on signal amplification by making use of a multifunctional fullerene-doped reduced graphene oxide nanohybrid. The nanohybrid was coated with poly(diallyldimethylammonium chloride) to obtain a material (P-C60 -rGO) with large specific surface area and a unique adsorption ability for loading it with glucose oxidase (GOx). The coating also facilitates the direct electron transfer between the active site of GOx and the glassy carbon electrode (GCE)...
December 4, 2018: Mikrochimica Acta
Baoyan Wu, Shihua Hou, Yongyong Xue, Zhan Chen
The study reports a facile and eco-friendly approach for nanomaterial synthesis and enzyme immobilization. A corresponding glucose biosensor was fabricated by immobilizing the gold nanoparticles (AuNPs) and glucose oxidase (GOD) multilayer films onto the polypyrrole (PPy)/reduced graphene oxide (RGO) modified glassy carbon electrode (GCE) via the electrodeposition and self-assembly. PPy and graphene oxide were first coated on the surface of a bare GCE by the electrodeposition. Then, AuNPs and GOD were alternately immobilized onto PPy-RGO/GCE electrode using the electrodeposition of AuNPs and self-assembly of GOD to obtain AuNPs-GOD multilayer films...
December 1, 2018: Nanomaterials
Chuchao Zhou, Shaokai Liu, Jialun Li, Ke Guo, Quan Yuan, Aimei Zhong, Jie Yang, Jiecong Wang, Jiaming Sun, Zhenxing Wang
Biomimetic mineralization using simulated body fluid (SBF) can form a bone-like apatite (Ap) on the natural polymers and enhance osteoconductivity, biocompatibility and reduce immunological rejection. Nevertheless, the coating efficiency of bone-like apatite layer on natural polymers is still needed to be improved. Graphene oxide (GO) is rich in functional groups, such as carbonyls (-COOH) and hydroxyls (-OH), which can provide more active sites for biomimetic mineralization and improve the proliferation of the rat bone marrow stromal cells (r-BMSCs)...
November 26, 2018: ACS Applied Materials & Interfaces
Dong Yan, Shu-Hua Li, Li-Ping Guo, Xiao-Ling Dong, Zhi-Yuan Chen, Wen-Cui Li
Lithium-ion capacitor (LIC) is a hybrid energy storage device that combines the energy storage mechanism of lithium-ion batteries and supercapacitors and presents the complementary features of them. However, imbalances of the capacity and kinetics between cathode and anode are still remained challenges. Herein, to address the issue of low capacity in cathode, we constructed a morning glory-like porous material crimped from an opening sandwich structure consisting of hard carbon inner layer and soft carbon outer layer, by coating graphene oxide-containing flaky phenolic resin with coal tar pitch followed with carbonization and activation...
November 26, 2018: ACS Applied Materials & Interfaces
Juan Wang, Yuan Cheng, Liang Chen, Tonghe Zhu, Kaiqiang Ye, Chao Jia, Hongjun Wang, Meifang Zhu, Cunyi Fan, Xiumei Mo
Graphene, as a promising biomaterial, has received great attention in biomedical fields due to its intriguing properties, especially the conductivity and biocompatibility. Given limited studies on the effects of graphene-based scaffolds on peripheral nerve regeneration in vitro and in vivo under electrical stimulation (ES), the present study was intended to systematically investigate how conductive graphene-based nanofibrous scaffolds regulate Schwann cell (SC) behavior including migration, proliferation and myelination, and PC12 cell differentiation in vitro via ES, and whether these conductive scaffolds could guide SC migration and promote nerve regeneration in vivo...
November 22, 2018: Acta Biomaterialia
Suyu Wang, Fan Gao, Yan Zhao, Ning Liu, Taizhe Tan, Xin Wang
In this work, a modified separator coated with a functional layer of reduced graphene oxide (RGO) anchored by cerium oxide (CeO2 ) nanoparticles was developed. The superior conductivity of RGO and chemical immobilization of high-ordered sulfur-related species (mainly Li2 Sn 4 ≤ n ≤ 8) of CeO2 yielded batteries with enhanced characteristics. A remarkable original capacity of 1136 mAh g-1 was obtained at 0.1 C with capacity retention ratio of 75.7% after 100 charge/discharge cycles. Overall, these data indicate that the separator with CeO2 /RGO composite is promising to suppress the shuttling of polysulfides for better utilization of the active material...
November 23, 2018: Nanoscale Research Letters
Cong Wu, Junyong Wang, Qinglin Deng, Mengjiao Li, Kai Jiang, Liyan Shang, Zhigao Hu, Junhao Chu
Due to the intrinsic low electrical conductivity and large volume expansion of the CoFe2 O4 based active materials, designing more novel structures is still one of the most important challenges for its lithium ion battery application. In this work, the CoFe2 O4 /reduced graphene oxide/carbon (CFO/rGO/C) composite with integrated multi-layer structure has been synthesized through a facial two-step hydrothermal method. Benefiting from the introduction of the graphene network and amorphous carbon coating layer, as well as the accompanying synergistic effect, this composite can exhibit fast and reversible lithium intercalation/deintercalation reactions...
January 25, 2019: Nanotechnology
Xianqiang Yin, Yanji Jiang, Yuehui Tan, Xiangmin Meng, Huimin Sun, Nong Wang
The ability to predict the transport of heavy metal ions in porous media with different surface characteristics is crucial to protect groundwater quality and public health. In this study, the effects of graphene oxide (GO) on co-transport and remobilization of Pb2+ and Cd2+ in humic acid (HA), smectite, kaolinite, and ferrihydrite-coated sand media were evaluated via laboratory packed-column experiments. Scanning electron microscope and energy dispersive X-ray analysis showed that the surface morphology of the coated sands was quite different and that ∼56...
November 15, 2018: Chemosphere
Mohammad Bagher Askari, Amirkhosro Beheshti-Marnani, Majid Seifi, Seyed Mohammad Rozati, Parisa Salarizadeh
A three-component nano-electrocatalyst, magnetite coated molybdenum disulfide hybridized with reduced graphene oxide (Fe3 O4 @MoS2 /RGO), is synthesized by a two-step hydrothermal method. This catalyst is applied as an effective substitution for the platinum catalyst in methanol oxidation and hydrogen evolution reactions. Cyclic voltammetry, chronoamperometry, and linear sweep voltammetry are used to evaluate the performance of the electrocatalyst in acidic and basic media. The results of methanol oxidation reaction on the hybridized nano-electrocatalyst showed good electrocatalytic properties with considerable diffusion currents...
November 8, 2018: Journal of Colloid and Interface Science
Valentina Palmieri, Francesca Bugli, Margherita Cacaci, Giordano Perini, Flavio De Maio, Giovanni Delogu, Riccardo Torelli, Claudio Conti, Maurizio Sanguinetti, Marco De Spirito, Robertino Zanoni, Massimiliano Papi
AIM: Fabrication of graphene oxide (GO)-based medical devices coatings that limit adhesion of Candida albicans, a main issue of healthcare-associated infections. METHODS: The GO composites noncovalently functionalized with curcumin (CU), a hydrophobic molecule with active antimicrobial action, polyethylene glycol (PEG) that hinders the absorption of biomolecules or a combination of CU and PEG (GO-CU-PEG) were drop-casted on surfaces and antifungal efficacy was assessed...
November 15, 2018: Nanomedicine
Yumi Choi, Chang Su Kim, Sungjin Jo
We investigated the effect of different spray-coating parameters on the electro-optical properties of Ag nanowires (NWs). Highly transparent and conductive Ag NW⁻graphene oxide (GO) hybrid electrodes were fabricated by using the spray-coating technique. The Ag NW percolation network was modified with GO and this led to a reduced sheet resistance of the Ag NW⁻GO electrode as the result of a decrease in the inter-nanowire contact resistance. Although electrical conductivity and optical transmittance of the Ag NW electrodes have a trade-off relationship, Ag NW⁻GO hybrid electrodes exhibited significantly improved sheet resistance and slightly decreased transmittance compared to Ag NW electrodes...
November 9, 2018: Materials
Muhammad Khitab Ahmed, Muhammad Shahid, Zulfiqar Ahmad Khan, Ameen Uddin Ammar, Abdul Saboor, Amir Khalid, Asad Hayat, Adil Saeed, Mehran Koohgilani
ZnO/GO (Graphene Oxide) and SAN (Styrene Acrylonitrile)/PANI (Polyaniline)/FLG (Few Layers Graphene) nanocomposite coatings were produced by solution casting and sol-gel methods, respectively, to enhance corrosion resistance of ferrous based materials. Corrosive seawater and 'produced crude oil water' environments were selected as electrolytes for this study. Impedance and coating capacitance values obtained from Electrochemical Impedance Spectroscopy (EIS) Alternating Current (AC technique) showed enhanced corrosion resistance of nanocomposites coatings in the corrosive environments...
November 11, 2018: Materials
Jun-Seok Yeo, You-Hyun Seo, Chan-Hee Jung, Seok-In Na
Solution-processable graphenes (represented by reduced graphene oxides, rGOs) have shown promising abilities as HTLs in perovskite solar cells (PeSCs). However, there has been no attempt to systematically tailor the characteristics of rGOs to the specifications of PeSCs. Furthermore, the applications of rGO HTLs have been limited to the spin-coating system, which is incompatible with roll-to-roll manufacturing. Here, with the aid of a polymer-graphene hybrid structure and a controllable synthesis method, we successfully developed a much more feasible rGO HTL and demonstrated highly efficient, stable, and printable p-i-n planar PeSCs with facile one-step processing...
November 8, 2018: Nanoscale
Zikai Jiang, Weigen Chen, Lingfeng Jin, Fang Cui, Zihao Song, Chengzhi Zhu
The development of functionalized metal oxide/reduced graphene oxide (rGO) hybrid nanocomposites concerning power equipment failure diagnosis is one of the most recent topics. In this work, WO₃ nanolamellae/reduced graphene oxide (rGO) nanocomposites with different contents of GO (0.5 wt %, 1 wt %, 2 wt %, 4 wt %) were synthesized via controlled hydrothermal method. X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analyses-derivative thermogravimetric analysis-differential scanning calorimetry (TG-DTG-DSC), BET, and photoluminescence (PL) spectroscopy were utilized to investigate morphological characterizations of prepared gas sensing materials and indicated that high quality WO₃ nanolamellae were widely distributed among graphene sheets...
November 5, 2018: Nanomaterials
Swadha Jaiswal, Richa Singh, Kislay Singh, Sana Fatma, Bhim Bali Prasad
The present work describes a new, simple, and easy method of generating acrylamide functionalised reduced graphene oxide-fullerene layer-by-layer assembled dual imprinted polymers to quantify D- and L-Serine at ultra trace level in aqueous and real samples. Herein, the pencil graphite electrode was initially spin coated with D-Serine imprinted acrylamide functionalized reduced graphene oxide. After 10 min thermal treatment (50 °C), this electrode was again modified with L-Serine imprinted acrylamide functionalized fullerene molecules...
January 15, 2019: Biosensors & Bioelectronics
Mohammad Hadi Norahan, Masoud Amroon, Ramin Ghahremanzadeh, Mahboobeh Mahmoodi, Nafiseh Baheiraei
The application of a cardiac patch over the epicardial surface has shown positive effects in protecting cardiac function postinfarction. Electroactive patches could enhance electrical signal propagation among cardiac cells. In the present study, an electrically active composite of collagen and graphene oxide (Col-GO) was fabricated as a cardiac patch. Col scaffolds were fabricated using a freeze-drying method and coated covalently with GO. Some scaffolds were also reduced by a reduction agent to restore the high conductivity of GO...
October 29, 2018: Journal of Biomedical Materials Research. Part A
Yuanlin Xue, Wenge Chen, Jiaojiao Wang, Longlong Dong, Qian Zhao, Yongqing Fu
Nanocomposite powders based on metal-coated graphene were synthesized using an in-situ co-reduction method in order to improve wettability and interfacial bonding between graphene and metal. Graphene oxide (GO) of 2~3 atomic layers was synthesized using the Hummer's method with graphite as a raw material and then dispersed into a dispersing agent solution mixed with N -Methyl pyrrolidone and deionized water to form a homogeneous GO suspension, which was finally added into electroless plating solutions for the reduction process...
October 23, 2018: Materials
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