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Coated reduced graphene Oxide

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https://www.readbyqxmd.com/read/30106270/a-highly-bendable-and-durable-transparent-electromagnetic-interference-shielding-film-prepared-by-wet-sintering-of-silver-nanowires
#1
Dong Gyu Kim, Jong Han Choi, Duck-Kyun Choi, Sang Woo Kim
Electromagnetic (EM) wave emissions from wearable or flexible smart display devices can cause product malfunction and have a detrimental effect on human health. Therefore, EM shielding strategies are becoming increasingly necessary. Consequently, herein, we prepared a transparent acrylic polymer-coated/reduced graphene oxide/silver nanowire (Ag NW) (A/RGO/SAW) EM interference (EMI) shielding film via liquid-to-vapor pressure-assisted wet sintering. The film exhibited enhanced Ag NW network formation and antireflection (AR) effects...
August 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30099362/in-situ-synthesis-of-rgo-zno-nanocomposite-for-demonstration-of-sunlight-driven-enhanced-photocatalytic-and-self-cleaning-of-organic-dyes-and-tea-stains-of-cotton-fabrics
#2
Partha Kumbhakar, Ashim Pramanik, Subrata Biswas, Arup Kanti Kole, Rajat Sarkar, Pathik Kumbhakar
Recently, research activities are focused on development of 2D reduced graphene oxide (rGO) based semiconductor nanocomposite materials for boosting up its catalytic applications. In this work, a rarely reported green synthesis approach has been envisioned to synthesize in-situ 2D rGO-ZnO (rGZn) nanocomposites from Apple juice and zinc acetate. Also the composition of the samples has been optimized to achieve high photocatalytic and self-cleaning properties by the formation of reactive oxidation species. The samples are characterized for their microstructural, optical absorption and photoluminescence properties...
July 29, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30088912/graphene-coated-aluminum-thin-film-anodes-for-lithium-ion-batteries
#3
Gi Duk Kwon, Eric Moyen, Yeo Jin Lee, Jemee Joe, Didier Pribat
We present a detailed study of graphene-coated aluminum thin films for Li-ion battery anode applications. The best electrode ageing behavior is obtained for Al films encapsulated with 4 porous graphene layers. Graphene encapsulation prevents "crushed" Al nanoparticles from detaching from the anode, thus allowing prolonged charge-discharge cycling. Graphene also provides surface conduction paths for electrons as well as diffusion paths for Li atoms. For the first time we report the electrochemical room temperature formation of phases such as Li3Al2 and even Li9Al4, with higher Li content than β-LiAl...
August 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30077462/hierarchical-porous-nanostructured-polypyrrole-coated-hydrogel-beads-containing-reduced-graphene-oxide-and-magnetite-nanoparticles-for-extraction-of-phthalates-in-bottled-drinks
#4
Sakchaibordee Pinsrithong, Opas Bunkoed
A hierarchically porous polypyrrole-coated nanostructured composite of reduced graphene oxide and magnetite nanoparticles (PPy-rGOx-Fe3 O4 ) incorporated into alginate hydrogel microspheres was synthesized and applied as a magnetic solid phase extraction adsorbent. The double network porous nanostructure of the composite hydrogel was created by CO2 produced from the reaction of hydrochloric acid with the CaCO3 in the hydrogel. The developed hydrogel microsphere was characterized and evaluated for the extraction and enrichment of phthalates...
July 27, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/30073797/high-efficient-stable-electrocatalytic-hydrogen-evolution-in-acid-media-by-amorphous-fe-x-p-coating-fe-2-n-supported-on-reduced-graphene-oxide
#5
Peng Yu, Lei Wang, Ying Xie, Chungui Tian, Fanfei Sun, Jingyuan Ma, Miaomiao Tong, Wei Zhou, Jinghong Li, Honggang Fu
Development of efficient and durable non-Pt catalysts for hydrogen evolution reaction (HER) in acid media is highly desirable. Iron nitride has emerged as a promising catalyst for its cost-effective nature, but the corresponding acidic stability must be promoted. Herein, phosphorus-decorated Fe2 N and reduced graphene oxide (P-Fe2 N/rGO) composite are designed and synthesized. X-ray photoelectron spectroscopy and X-ray absorption fine structure (XAFS) show that a thin layer amorphous iron phosphide is coated on the surface of Fe2 N nanoparticles, which could be responsible for the well resistance of chemical corrosion in acidic media...
August 2, 2018: Small
https://www.readbyqxmd.com/read/30062344/layer-by-layer-assembled-multilayers-of-charged-polyurethane-and-graphene-oxide-platelets-for-flexible-and-stretchable-gas-barrier-films
#6
Min Ji Noh, Min Jun Oh, Jae Ho Choi, Jae Chul Yu, Woo-Jae Kim, Juhyun Park, Young-Wook Chang, Pil J Yoo
With the advent of the era of consumer-oriented displays and mobile devices, the importance of barrier film coatings for securing devices from oxygen or moisture penetration has become more salient. Recently developed approaches to generate gas barrier films in a combination of polyelectrolyte multilayer matrices and incorporated inorganic nanosheets have shown great potential in outperforming conventional gas barrier films. However, these films have the intrinsic drawback of vulnerability to brittleness and inability to stretch for flexible device applications...
August 15, 2018: Soft Matter
https://www.readbyqxmd.com/read/30029481/3d-carbon-microelectrodes-with-bio-functionalized-graphene-for-electrochemical-biosensing
#7
Suhith Hemanth, Arnab Halder, Claudia Caviglia, Qijin Chi, Stephan Sylvest Keller
An enzyme-based electrochemical biosensor has been developed with 3D pyrolytic carbon microelectrodes that have been coated with bio-functionalized reduced graphene oxide (RGO). The 3D carbon working electrode was microfabricated using the pyrolysis of photoresist precursor structures, which were subsequently functionalized with graphene oxide and enzymes. Glucose detection was used to compare the sensor performance achieved with the 3D carbon microelectrodes (3DCMEs) to the 2D electrode configuration. The 3DCMEs provided an approximately two-fold higher sensitivity of 23...
July 19, 2018: Biosensors
https://www.readbyqxmd.com/read/30023578/favorable-biological-responses-of-neural-cells-and-tissue-interacting-with-graphene-oxide-microfibers
#8
Ankor González-Mayorga, Elisa López-Dolado, María C Gutiérrez, Jorge E Collazos-Castro, M Luisa Ferrer, Francisco Del Monte, María C Serrano
Neural tissue engineering approaches show increasing promise for the treatment of neural diseases including spinal cord injury, for which an efficient therapy is still missing. Encouraged by both positive findings on the interaction of carbon nanomaterials such as graphene with neural components and the necessity of more efficient guidance structures for neural repair, we herein study the potential of reduced graphene oxide (rGO) microfibers as substrates for neural growth in the injured central neural tissue...
November 30, 2017: ACS Omega
https://www.readbyqxmd.com/read/29995381/organometallic-precursor-derived-sno-2-sn-reduced-graphene-oxide-sandwiched-nanocomposite-anode-with-superior-lithium-storage-capacity
#9
Xiaoyu Sui, Xingkang Huang, Yingpeng Wu, Ren Ren, Haihui Pu, Jingbo Chang, Guihua Zhou, Shun Mao, Junhong Chen
Benefiting from the reversible conversion reaction upon delithiation, nanosized SnO2 , with its theoretical capacity of 1494 mA h g-1 , has gained special attention as a promising anode material. Here, we report a self-assembled SnO2 /Sn-reduced graphene oxide (rGO) sandwich nanocomposite developed by organometallic precursor coating and in situ transformation. Ultrafine SnO2 nanoparticles with an average diameter of 5 nm are sandwiched within the rGO/carbonaceous network, which not only greatly alleviates the volume changes upon lithiation and aggregation of SnO2 nanoparticles but also facilitates the charge transfer and reaction kinetics of SnO2 upon lithiation/delithiation...
July 25, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29979565/graphene-boosted-high-performance-aqueous-zn-ion-battery
#10
Chao Shen, Xin Li, Nan Li, Keyu Xie, Jian-Gan Wang, Xingrui Liu, Bingqing Wei
Given their low cost and eco-friendliness, rechargeable Zn-ion batteries (ZIBs) have received increasing attention as a device with great potential for large-scale energy storage. However, the development of ZIBs with high capacities and long lifespans is challenging because of the dendritic growth of Zn and the absence of suitable cathode materials. Herein, we report a novel rechargeable aqueous Zn-ion battery (AZIB) that consist of Zn coated with reduced graphene oxide as the anode and V3 O7 ·H2 O/rGO composite as the cathode...
August 1, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29969124/synthesis-and-organic-solar-cell-performance-of-bodipy-and-coumarin-functionalized-swcnts-or-graphene-oxide-nanomaterials
#11
Ahmet Şenocak, Esra Nur Kaya, Burak Kadem, Tamara Basova, Erhan Demirbaş, Aseel Hassan, Mahmut Durmuş
The synthesis and characterization of new hybrid materials based on reduced graphene oxide (rGO) or single walled carbon nanotubes (SWCNTs) covalently functionalized by 4,4'-difluoro-8-(4-propynyloxy)-phenyl-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene (BODIPY) (2) or 7-(prop-2-yn-1-yloxy)-3-(3',4',5'-trimethoxyphenyl)-coumarin (4) as light harvesting groups have been described. The organic solar cell performances of these novel nanomaterials in P3HT:PCBM blends were investigated. These covalently bonded hybrid materials (reduced graphene oxide:BODIPY (GB), reduced graphene oxide:Coumarin (GC), SWCNTs:BODIPY (CB) and SWCNTs:Coumarin (CC)) were prepared by an azide-alkyne Huisgen cycloaddition (click) reaction between the azide bearing SWCNTs or rGO and terminal ethynyl functionalized BODIPY (2) or coumarin (4) derivatives...
July 24, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29954559/functionalized-graphene-for-mechanical-property-enhancement-of-polymer-composites
#12
Chengzhi Luo, Chentian Shi, Chaozhi Yu, Qiang Fu, Chunxu Pan
Because of its high strength and high toughness, graphene has been widely used in mechanical reinforced composites. In general, the mechanical enhancement depends mainly on the properties of graphene itself and the number of surface chemical functional groups attached on it. In this paper, we report a method to improve the mechanical performance of polymer by using a kind of functionalized reduced graphene oxide (F-RGO), i.e., the F-RGO is prepared by chemical treatment, and then the F-RGO/polyvinylidene fluoride (PVDF) composite films are obtained by spin coating...
October 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29951480/synthesis-and-electrochemical-performance-of-molybdenum-disulfide-reduced-graphene-oxide-polyaniline-ternary-composites-for-supercapacitors
#13
Li-Zhong Bai, Yan-Hui Wang, Shuai-Shuai Cheng, Fang Li, Zhi-Yi Zhang, Ya-Qing Liu
Molybdenum disulfide/reduced graphene oxide/polyaniline ternary composites (MoS2 /rGO/PANI) were designed and synthesized by a facile two-step approach including hydrothermal and in situ polymerization process. The MoS2 /rGO/PANI composites presented an interconnected 3D network architecture, in which PANI uniformly coated the outer surface of the MoS2 /rGO binary composite. The MoS2 /rGO/PANI composites with a weight percent of 80% (MGP-80) exhibits the best specific capacitance (570 F g-1 at 1 A g-1 ) and cycling stabilities (78...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29942963/revisiting-graphene-polymer-nanocomposite-for-enhancing-anticorrosion-performance-a-new-insight-into-interface-chemistry-and-diffusion-model
#14
Dipak Dutta, Andita Nataria Fitri Ganda, Jui-Kung Chih, Cheng-Chun Huang, Chung-Jen Tseng, Ching-Yuan Su
Graphene is impermeable to all molecules and has high chemical stability, which makes it an excellent anticorrosion coating for metals. However, current studies have indicated that galvanic coupling between graphene and a metal actually accelerates corrosion at the interface. Due to the insulating nature of polymers, graphene-polymer composite coatings with a strong interaction between the filler and the polymer matrix are an alternative means of addressing this issue. Nevertheless, such coatings require well-dispersed graphene flakes to lengthen the diffusion paths of gases or liquids, while preventing the formation of a conducting network from graphene to the metal...
July 9, 2018: Nanoscale
https://www.readbyqxmd.com/read/29935815/reduced-graphene-oxide-coated-magnetic-nanoparticles-as-sorbent-for-the-determination-of-phthalates-in-environmental-samples-by-micro-dispersive-solid-phase-extraction-followed-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#15
Álvaro Santana-Mayor, Bárbara Socas-Rodríguez, María Del Mar Afonso, José Antonio Palenzuela-López, Miguel Ángel Rodríguez-Delgado
In this work, the suitability of Fe3 O4 nanoparticles coated with reduced-graphene oxide as sorbent was evaluated for the extraction of a group of fourteen phthalic acid esters (i.e. benzylbutyl phthalate (BBP), bis-2-n-butoxyethyl phthalate (DBEP), dibutyl phthalate (DBP), diisobutyl phthalate (DIBP), dicyclohexyl phthalate (DCHP), bis-2-ethoxyethyl phthalate (DEEP), diisodecyl phthalate (DIDP), diisononyl phthalate (DINP), bis-isopentyl phthalate (DIPP), bis-(2-methoxyethyl) phthalate (DMEP), dimethyl phthalate (DMP), di-n-octyl phthalate (DNOP), bis-n-pentyl phthalate (DNPP), dipropyl phthalate (DPP)) from environmental samples...
August 31, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29912546/extraordinary-corrosion-protection-from-polymer-clay-nanobrick-wall-thin-films
#16
Eric J Schindelholz, Erik D Spoerke, Hai-Duy Nguyen, Jaime C Grunlan, Shuang Qin, Daniel C Bufford
Metals across all industries demand anticorrosion surface treatments and drive a continual need for high-performing and low-cost coatings. Here we demonstrate polymer-clay nanocomposite thin films as a new class of transparent conformal barrier coatings for protection in corrosive atmospheres. Films assembled via layer-by-layer deposition, as thin as 90 nm, are shown to reduce copper corrosion rates by >1000× in an aggressive H2 S atmosphere. These multilayer nanobrick wall coatings hold promise as high-performing anticorrosion treatment alternatives to costlier, more toxic, and less scalable thin films, such as graphene, hexavalent chromium, or atomic-layer-deposited metal oxides...
July 5, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29888351/bulk-properties-of-aqueous-graphene-oxide-and-reduced-graphene-oxide-with-surfactants-and-polymers-adsorption-and-stability
#17
Thomas M McCoy, Liliana de Campo, Anna V Sokolova, Isabelle Grillo, Ekaterina I Izgorodina, Rico F Tabor
A diverse range of molecular surfactants and polymers have been incorporated into aqueous graphene oxide (GO) and reduced graphene oxide (rGO) dispersions in order to understand the complex relationship between surface chemistry, surface forces and interfacial thermodynamics of these materials with typical amphiphiles. Surfactant additives were systematically varied in terms of their charge and hydrophobicity to reveal important structure-function relationships affecting adsorption and interaction with GO and rGO surfaces...
June 20, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29876346/reduced-graphene-oxide-decorated-na-3-v-2-po-4-3-microspheres-as-cathode-material-with-advanced-sodium-storage-performance
#18
Hezhang Chen, Yingde Huang, Gaoqiang Mao, Hui Tong, Wanjing Yu, Junchao Zheng, Zhiying Ding
Reduced graphene oxide (rGO) sheet decorated Na3 V2 (PO4 )3 (NVP) microspheres were successfully synthesized by spray-drying method. The NVP microspheres were embedded by rGO sheets, and the surface of the particles were coated by rGO sheets and amorphous carbon. Thus, the carbon conductive network consisted of rGO sheets and amorphous carbon generated in the cathode material. NVP microspheres decorated with different content of rGO (about 0, 4, 8, and 12 wt%) were investigated in this study. The electrochemical performance of NVP exhibited a significant enhancement after rGO introduction...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29806166/a-scalable-approach-to-dendrite-free-lithium-anodes-via-spontaneous-reduction-of-spray-coated-graphene-oxide-layers
#19
Maohui Bai, Keyu Xie, Kai Yuan, Kun Zhang, Nan Li, Chao Shen, Yanqing Lai, Robert Vajtai, Pulickel Ajayan, Bingqing Wei
Li-metal batteries (LiMBs) are experiencing a renaissance; however, achieving scalable production of dendrite-free Li anodes for practical application is still a formidable challenge. Herein, a facile and universal method is developed to directly reduce graphene oxide (GO) using alkali metals (e.g., Li, Na, and K) in moderate conditions. Based on this innovation, a spontaneously reduced graphene coating can be designed and modulated on a Li surface (SR-G-Li). The symmetrical SR-G-Li|SR-G-Li cell can run up to 1000 cycles at a high practical current density of 5 mA cm-2 without a short circuit, demonstrating one of the longest lifespans reported with LiPF6 -based carbonate electrolytes...
May 28, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29801604/reduced-graphene-oxide-nile-blue-gold-nanoparticles-complex-modified-glassy-carbon-electrode-used-as-a-sensitive-and-label-free-aptasensor-for-ratiometric-electrochemical-sensing-of-dopamine
#20
Hui Jin, Chunqin Zhao, Rijun Gui, Xiaohui Gao, Zonghua Wang
In this work, glassy carbon electrode (GCE) surface was modified by drop-coating graphene oxide (GO) and nile blue (NB) to form GO/NB/GCE. By using a one-step coreduction treatment under cyclic voltammetry (CV) scanning, gold nanoparticles (AuNPs) were electrodeposited onto GO/NB/GCE surface, simultaneously generating reduced GO (rGO). AuNPs from the prepared rGO/NB/AuNPs/GCE was combined with 5'-SH-terminated aptamer of dopamine (DA) via Au-S coupling to fabricate aptamer-rGO/NB/AuNPs/GCE system. DA specifically combined with its aptamer modified on rGO/NB/AuNPs/GCE surface...
September 26, 2018: Analytica Chimica Acta
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