Read by QxMD icon Read

Coated reduced graphene Oxide

Longfei Song, Linqu Luo, Yan Xi, Jianjun Song, Ying Wang, Liping Yang, Anqi Wang, Yunfa Chen, Ning Han, Fengyun Wang
Although significant developments have been made in the low-concentration formaldehyde monitoring in indoor air by using gas sensors, they still suffer from insufficient performance for achieving ppb-level detection. In this work, <100> oriented Si nanowires (SiNWs) with high specific surface area were prepared via metal-assisted chemical etching method (MACE), and then were uniformly coated with graphene oxide (GO) followed by the subsequent reductive process in H2 /Ar atmosphere at 800 °C to obtain reduced graphene oxide (RGO)...
March 14, 2019: Nanoscale Research Letters
Suping Li, Ying Huang, Ding Ling, Na Zhang, Meng Zong, Xiulan Qin, Panbo Liu
In this study, an Fe-Co alloy is coated with carbon and decorated on a holey reduced graphene oxide nanosheet (FeCo@C/HRGO) composite. The structure is synthesized using liquid-phase reduction and hydrothermal processes followed by high-temperature calcination. The FeCo@C/HRGO composite is identified and characterized using XRD, XPS, Raman spectroscopy, TEM, and SEM. This novel composite exhibits excellent electromagnetic-wave absorption properties. The maximum reflection loss for FeCo@C/HRGO reaches -76.6 dB at 16...
February 10, 2019: Journal of Colloid and Interface Science
Zhen Yuan Xia, Meganne Christian, Catia Arbizzani, Vittorio Morandi, Massimo Gazzano, Vanesa Quintano, Alessandro Kovtun, Vincenzo Palermo
Major breakthroughs in batteries would require the development of new composite electrode materials, with a precisely controlled nanoscale architecture. However, composites used for energy storage are typically a disordered bulk mixture of different materials, or simple coatings of one material onto another. We demonstrate here a new technique to create complex hierarchical electrodes made of multilayers of vertically aligned nanowalls of hematite (Fe2O3) alternated with horizontal spacers of reduced graphene oxide (RGO), all deposited on a 3D, conductive graphene foam...
March 7, 2019: Nanoscale
Yi-Fang Hung, Chia Cheng, Chun-Kai Huang, Chii-Rong Yang
The electrochemical reduction of graphene oxide (GO) is an environmentally friendly and energy-saving method for improving the characteristics of GO. However, GO films must be coated on the cathode electrode in advance when usingthis technique. Thus, the formed electrochemically reduced GO (ERGO) films can be used only as sensing or conductive materials in devices because mass production of the flakes is not possible. Therefore, this study proposes a facile electrochemical reduction technique. In this technique, GO flakes can be directly used as reduced materials, and no GO films are required in advance...
March 5, 2019: Nanomaterials
Vihang Parimal Parikh, Arman Ahmadi, Mihit H Parekh, Farshid Sadeghi, Vilas G Pol
This manuscript provides an alternative solution to overgrowing battery recycling via upcycling of spent lithium cobalt oxide (LCO) as a new promising solid lubricant additive. The advanced solid lubricant mixture of graphene, Aremco binder and recycled LCO formulated a spray with the use of excess volatile organic solvent. Numerous flat steel disks were spray coated with new lubricant formulation and naturally dried followed by curing at 180°C. When tested on a ball-on-disk up to 230 m distance, the composite new solid lubricant reduces coefficient of friction (COF) by 85% between two steel surfaces compare to unlubricated surfaces under constant 1 GPa Hertzian pressure in an ambient environment...
March 1, 2019: Environmental Science & Technology
Jurgis Barkauskas, Lina Mikoliunaite, Ieva Paklonskaite, Povilas Genys, Jurate Jolanta Petroniene, Inga Morkvenaite-Vilkonciene, Almira Ramanaviciene, Urte Samukaite-Bubniene, Arunas Ramanavicius
In this study a polycarbonate filter membrane (PcFM) with 400 nm diameter holes was covered/protruded by single walled carbon nanotubes (SWCNT) and then formed PcFM/SWCNT structure was covered by thin layer of graphene oxide (GO) or reduced graphene oxide (rGO) in order to get the multilayered PcFM/SWCNT/GO and PcFM/SWCNT/rGO coatings, respectively. It was determined that the SWCNTs filaments were able to form a layer on the polycarbonate membrane having a number of carbon nanotube arranged in different orientations...
May 2019: Materials Science & Engineering. C, Materials for Biological Applications
N Karimi, M Kharaziha, K Raeissi
Chitosan reinforced hydroxyapatite-graphene oxide (CS-GO-HA) nanocomposite coatings were developed using electrophoretic deposition process in order to improve the biological and electrochemical properties of Ti surface. Moreover, the role of anodized layer on the physical and electrochemical properties of the CS-GO-HA nanocomposite coating was evaluated. After synthesize of HA-GO nanopowder using a sol-gel process, nanocomposite coatings with various concentrations of chitosan (0.5, 1 and 1.5 mg/ml) were produced...
May 2019: Materials Science & Engineering. C, Materials for Biological Applications
Taeyang Han, Youhan Sohn, Sang Jin Park, Yu-Chan Kim, Kang Sik Lee, Hye Sung Kim, Soon-Gil Yoon, Dojin Kim, Jun Hyun Han
A paramagnetic NiTi substrate was coated with diamagnetic carbon materials, i.e., graphene, graphene oxide (GO), and carbon nanotubes (CNTs), in order to reduce magnetic resonance (MR) image artifacts of NiTi implants. The present study focused on the effect of magnetic susceptibility variations in NiTi caused by the carbon coating on MR image artifacts. In the case of the graphene and GO coatings, the reduction of the magnetic susceptibility was greater along the perpendicular direction than the parallel direction...
May 2019: Materials Science & Engineering. C, Materials for Biological Applications
Xiaoqing Cui, Chaochao Yue, Ruifeng Zhu, Wenyun Fang, Jing Wang, Hong Zhao, Zengxi Li
Selective and sensitive determination of nitrite is of great importance in practical application. In the present work, a novel nitrite sensing platform was built based on the fabrication of nitrogen-doped-carbon-coated hexagonal cobalt oxyhydroxide (CN@CoOOH) on reduced graphene oxide (RGO) using zeolitic imidazolate framework material (ZIF)-67 as precursor. The CN@CoOOH/RGO nanocomposite was confirmed by UV-visible (UV-vis), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectrum (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD)...
February 25, 2019: Nanotechnology
Dinesh Rokaya, Viritpon Srimaneepong, Jiaqian Qin, Krisana Siraleartmukul, Vilailuck Siriwongrungson
The aim of this study was to evaluate the mechanical and tribological properties of graphene oxide/silver nanoparticle (GO/AgNP) coated medical grade nickel-titanium (NiTi) alloy. The alloy substrates were coated using electrophoretic deposition at 30 V for 1, 5, and 10 min and were characterized by SEM, Raman spectroscopy, EDS, and surface profilometer. Mechanical and tribological tests were performed for hardness, Young's modulus, and friction coefficient. The data were analyzed using the Kruskal-Wallis test at a significance level of 0...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Leila Naderi, Saeed Shahrokhian
Wire-shaped micro-supercapacitors attracted extensive attentions in next-generation portable and wearable electronics, due to advantages of miniature size, lightweight and flexibility. Herein, NiMoO4 nanorods supported on Ni film coated Cu wire are successfully fabricated thorough direct deposition of Ni film onto Cu wire as the conductive substrate, followed by growth of the NiMoO4 nanorods on Ni film coated Cu wire substrate by means a hydrothermal annealing process. The prepared 3D, porous electrode demonstrates extremely high areal specific capacitance of 12...
February 7, 2019: Journal of Colloid and Interface Science
Qun Cao, Pumidech Puthongkham, B Jill Venton
The carbon-fiber microelectrode has been used for decades as a neurotransmitter sensor. Recently, new strategies have been developed for making carbon electrodes, including using carbon nanomaterials or pyrolyzing photoresist etched by nanolithography or 3D printing. This review summarizes how chemical and 3D surface structures of new carbon electrodes are optimized for neurotransmitter detection. There are effects of the chemical structure that are advantageous and nanomaterials are used ranging from carbon nanotube (CNT) to graphene to nanodiamond...
January 21, 2019: Analytical Methods: Advancing Methods and Applications
Fereshteh Chekin, Vladyslav Myshin, Ran Ye, Sorin Melinte, Santosh K Singh, Sreekumar Kurungot, Rabah Boukherroub, Sabine Szunerits
Doxorubicin (DOX), an anthracycline molecule, is currently one of the most widely used anticancer drugs in clinics. Systematic treatment of patients with DOX is known to be accompanied by several unpleasant side effects due to the toxicity of the drug. Thus, monitoring of DOX concentration in serum samples has become increasingly important to avoid side effects and ensure therapeutic efficiency. In this study, we discuss the construction of a disposable electrochemical sensor for the direct monitoring of DOX in clinical blood samples...
February 9, 2019: Analytical and Bioanalytical Chemistry
Dongxiao Yang, Haoyu Ren, Dapeng Wu, Wenchao Zhang, Xiangdong Lou, Danqi Wang, Kun Cao, Zhiyong Gao, Fang Xu, Kai Jiang
Three-dimensional reduced graphene oxide@SnO2 @nitrogen-doped carbon (3DG@SnO2 @N-C) composites are designed as high efficiency anode materials for lithium-ion batteries. The SnO2 particle size, surface area and pore size distribution of the 3DG@SnO2 @N-C could be simply controlled by altering the GO dosages. The optimized 3DG@SnO2 @N-C electrode demonstrates a reversible capacity of 1349.5 mAh g-1 after 100 cycles at the current density of 100 mA g-1 . Based on the structural and electrochemical dynamic tests, the bi-functional N-doped carbon coating layer could serve as both conductive channel for electron transport and as buffer layer to alleviate the volume change of embedded SnO2 NPs...
January 30, 2019: Journal of Colloid and Interface Science
Hao Yang, Kaipeng Wu, Guorong Hu, Zhongdong Peng, Yanbing Cao, Ke Du
Graphene has been implemented as a desirable additive to improve the electrochemical performance of Ni-rich cathode materials. However, it is not only hard to ensure the intimate interaction between them in practice which may affect the surface electronic conductivity of the composite, but also a challenge to fabricate cathodes with uniform graphene coating due to its 2D planar structure. Besides, the graphene coating layer are easily peeled off from cathode material during cycling process, especially at upper cut-off voltage...
February 4, 2019: ACS Applied Materials & Interfaces
Giacomo Reina, Amalia Ruiz, Diane Murera, Yuta Nishina, Alberto Bianco
The last decade has seen an increase in the application of graphene oxide (GO) in the biomedical field. GO has been successfully exploited for its ability to deliver many kinds of drugs into target cells. However, GO toxicity assessment is still controversial. Several studies demonstrated that GO protein coating is crucial to alleviate the material's toxicity. Besides, coronation leads to the formation of big agglomerates, reducing the cellular uptake of the material and thus its therapeutic efficiency. In this work, we propose a simple and efficient method based on rapid (Ultra-Turrax, UT) mixing to control protein corona formation...
January 29, 2019: ACS Applied Materials & Interfaces
Minas M Stylianakis, George Viskadouros, Christos Polyzoidis, George Veisakis, George Kenanakis, Nikolaos Kornilios, Konstantinos Petridis, Emmanuel Kymakis
Hydroiodic acid (HI)-treated reduced graphene oxide (rGO) ink/conductive polymeric composites are considered as promising cold cathodes in terms of high geometrical aspect ratio and low field emission (FE) threshold devices. In this study, four simple, cost-effective, solution-processed approaches for rGO-based field effect emitters were developed, optimized, and compared; rGO layers were coated on (a) n+ doped Si substrate, (b) n⁺-Si/P3HT:rGO, (c) n⁺-Si/PCDTBT:rGO, and (d) n⁺-Si/PCDTBT:PC71 BM:rGO composites, respectively...
January 22, 2019: Nanomaterials
Bushra Khan, Adeyemi S Adeleye, Robert M Burgess, Roxanna Smolowitz, Stephen M Russo, Kay T Ho
Graphene is a two-dimensional nanomaterial with unique mechanical, thermal, electrical, and optical properties. With increasing applications of graphene-family nanomaterials (GFNs) in electronics, biomedicine, and surface coatings, concern for their impacts on aquatic ecosystems is rising. Current information on the toxicity of GFNs, including graphene oxide (GO), is scarce. Filter-feeding bivalves, such as Eastern oysters, are good models for nanomaterial exposure studies. We present results from a 72-hour static renewal oyster study using 1 and 10 mg/L GO which, to our knowledge, is the first report on in vivo effects of GO exposures in marine bivalves...
January 22, 2019: Environmental Toxicology and Chemistry
Selvaraj Chinnathambi, Gert-Jan Euverink
Here, we report the engineering of a solid-state micro pH sensor based on polyaniline-functionalized, electrochemically reduced graphene oxide (ERGO-PA). Electrochemically reduced graphene oxide acts as the conducting layer and polyaniline acts as a pH-sensitive layer. The pH-dependent conductivity of polyaniline occurs by doping of holes during protonation and by the dedoping of holes during deprotonation. We found that an ERGO-PA solid-state electrode was not functional as such in fermentation processes. The electrochemically active species that the bacteria produce during the fermentation process interfere with the electrode response...
January 7, 2019: Journal of Visualized Experiments: JoVE
Peng Peng, Lihang Li, Peng He, Ying Zhu, Jian Fu, Yongde Huang, Wei Guo
Flexible electrodes have attracted much attention in consumer electronic applications. In this work, laser direct writing is used to fabricate copper/graphene composite electrodes on flexible substrate in one-step. This direct writing process with low power laser can reduce copper ions in thin films to form copper nanomaterials and spontaneously interconnect them to gain good conductivity, while laser also induce the growth of multi-layer graphene that coats on copper to improve the oxidation resistance of electrodes...
January 14, 2019: Nanotechnology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"