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graphene oxide

Yong Li, Daixin Ye, Wen Liu, Bin Shi, Rui Guo, Haijuan Pei, Jingying Xie
Manganese oxides are promising anode materials for their high-energy density. However, they suffer from poor rate capability and fast capacity fading. Herein, we construct a three-dimensional (3D) core-shell structured polypyrrole (PPy)/MnO2-reduced graphene oxide (rGO)-carbon nanotubes (CNTs) composite via a facile two-step method. In the structure, the CNTs can facilitate fast electron conduction and keep structural integrity. The flexible and conductive rGO nanosheets work as both a reactive material and a carrier for MnO2 in-situ growth...
January 10, 2017: Journal of Colloid and Interface Science
Rui Bao, Baoyu Tan, Shuang Liang, Ning Zhang, Wei Wang, Wenguang Liu
Previous studies suggested that a stiffer hydrogel system exhibited a better performance to promote heart function after myocardial infarction (MI). However, the nature of myocardium, a tissue that alternately contracts and relaxes with electrical impulses, leads us to hypothesize that a soft and conductive hydrogel may be in favor of mechanical and electrical signals transmission to enhance heart function after MI. In this work, π-π conjugation interaction was first employed to produce a soft injectable hydrogel with conductive property...
January 12, 2017: Biomaterials
Xia Liu, Jing Ma, Xiaoming Wu, Liwei Lin, Xiaohong Wang
Piezoelectricity in macromolecule polymers has been gaining immense attention, particularly for applications in biocompatible, implantable, and flexible electronic devices. This paper introduces core-shell-structured piezoelectric polyvinylidene fluoride (PVDF) nanofibers chemically wrapped by graphene oxide (GO) lamellae (PVDF/GO nanofibers), in which the polar β-phase nanocrystals are formed and uniaxially self-oriented by the synergistic effect of mechanical stretching, high-voltage alignment, and chemical interactions...
January 20, 2017: ACS Nano
Jon Alexander Lewis Willcox, Hyung J Kim
A molecular dynamics graphene oxide model is used to shed light on commonly overlooked features of graphene oxide membranes. The model features both perpendicular and parallel water flow across multiple sheets of pristine and/or oxidized graphene to simulate "brick-and-mortar" microstructures. Additionally, regions of pristine/oxidized graphene overlap which have thus far been overlooked in the literature are explored. Differences in orientational and hydrogen-bonding features between adjacent layers of water in this mixed region are found to be even more prominent than differences between pristine and oxidized channels...
January 20, 2017: ACS Nano
Qixing Zhou, Xiangang Hu
The interactions between nanomaterials and plants have attracted increasing attention. However, the systemic stress and recovery patterns of plants in response to nanomaterials and the connections between the molecular responses and phenotypes remain unclear. Herein, rice was exposed to graphene oxide (GO) nanosheets at 0.01-1 mg/L for 7 days under hydroponic exposure, followed by a 7-day post-exposure (GO-free). The significant upregulation (p<0.05) of phenylalanine metabolism, secondary metabolism and heme peroxidase reflected the stress and recovery patterns of rice roots exposed to GO...
January 20, 2017: Environmental Science & Technology
Ding Zheng, Wei Huang, Pu Fan, Yifan Zheng, Jiang Huang, Junsheng Yu
A novel hybrid cathode interlayer (CIL) consisting of reduced graphene oxide and zinc oxide (ZnO) is realized in the inverted organic solar cells (OSCs). Dual-nozzle spray coating system and facile one step in-situ thermal reduction/annealing (ITR/ITA) method are introduced to precisely control the components of the CIL, assemble ZnO with graphene oxide, and reduce graphene oxide into in-situ thermal reduced graphene oxide (IT-RGO), simultaneously. The ZnO:IT-RGO hybrid CIL shows high electric conductivity, interconnecting nanostructure and matched energy level, which leads to a significant enhancement in the power conversion efficiency from 6...
January 20, 2017: ACS Applied Materials & Interfaces
XingChen Zhai, Hua Zhang, Min Zhang, Xin Yang, Cheng Gu, GuoPeng Zhou, Haitian Zhao, Zhenyu Wang, Aijun Dong, Jing Wang
A rapid monitoring platform for sensitive voltammetric detection of thiamethoxam (TMX) residues was reported in the present study. The β-cyclodextrin-reduced graphene oxide composite (β-CD-rGO) was used as a reinforcing material in electrochemical determination of TMX. Compared with bare glassy carbon electrode (GCE), the reduction peak currents of TMX at rGO/GCE and β-CD-rGO/GCE were increased by 70 and 124 folds, respectively. The experimental conditions influencing voltammetric determination of TMX, such as the amount of β-CD-rGO, solution pH, temperature and time on accumulation, were optimized...
January 20, 2017: Environmental Toxicology and Chemistry
Sandeep Mittal, Veeresh Kumar, Nitesh Dhiman, Lalit Kumar Singh Chauhan, Renu Pasricha, Alok Kumar Pandey
No abstract text is available yet for this article.
January 20, 2017: Scientific Reports
Cheol-Ho Lee, Jin-Mun Yun, Sungho Lee, Seong Mu Jo, KwangSup Eom, Doh C Lee, Han-Ik Joh, Thomas F Fuller
Amorphous molybdenum sulfide (MoSx) is covalently anchored to reduced graphene oxide (r-GO) via a simple one-pot reaction, thereby inducing the reduction of GO and simultaneous doping of heteroatoms on the GO. The oxygen atoms form a bridged between MoSx and GO and play a crucial role in the fine dispersion of the MoSx particles, control of planar MoSx growth, and increase of exposed active sulfur sites. This bridging leads to highly efficient (-157 mV overpotential and 41 mV/decade Tafel slope) and stable (95% versus initial activity after 1000 cycles) electrocatalyst for hydrogen evolution...
January 20, 2017: Scientific Reports
Jungho Kim, Se-Jin Park, Dal-Hee Min
No abstract text is available yet for this article.
January 3, 2017: Analytical Chemistry
Guanjie He, Mo Qiao, Wenyao Li, Yao Lu, Tingting Zhao, Rujia Zou, Bo Li, Jawwad A Darr, Junqing Hu, Maria-Magdalena Titirici, Ivan P Parkin
Metal sulfides are commonly used in energy storage and electrocatalysts due to their redox centers and active sites. Most literature reports show that their performance decreases significantly caused by oxidation in alkaline electrolyte during electrochemical testing. Herein, S and N co-doped graphene-based nickel cobalt sulfide aerogels are synthesized for use as rechargeable alkaline battery electrodes and oxygen reduction reaction (ORR) catalysts. Notably, this system shows improved cyclability due to the stabilization effect of the S and N co-doped graphene aerogel (SNGA)...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Chenguang Qiu, Zhiyong Zhang, Mengmeng Xiao, Yingjun Yang, Donglai Zhong, Lian-Mao Peng
High-performance top-gated carbon nanotube field-effect transistors (CNT FETs) with a gate length of 5 nanometers can be fabricated that perform better than silicon complementary metal-oxide semiconductor (CMOS) FETs at the same scale. A scaling trend study revealed that the scaled CNT-based devices, which use graphene contacts, can operate much faster and at much lower supply voltage (0.4 versus 0.7 volts) and with much smaller subthreshold slope (typically 73 millivolts per decade). The 5-nanometer CNT FETs approached the quantum limit of FETs by using only one electron per switching operation...
January 20, 2017: Science
Shokouh Mahpishanian, Hassan Sereshti
In this research, β-cyclodextrin/iron oxide reduced graphene oxide hybrid nanostructure (β-CD/MRGO) with high water dispersability, excellent magnetic responsivity and molecular selectivity was prepared via a facile one step green strategy. The obtained nanomaterial was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, and vibrating sample magnetometry (VSM), which confirmed the modification of GO with β-CD and magnetic nanoparticles...
January 14, 2017: Journal of Chromatography. A
Ting Li, Chao-Zhi Zhang, Chengyue Gu
With popular application of graphene and graphene oxide (GO), they have been discharged into water. Graphene and GO would harm organisms. However, an efficient and economical method for removing graphene and GO in wastewater has seldom been reported. Graphene can be oxidized by hydrogen peroxide to give GO, therefore, degradation of graphene oxide is an important step in procedure of removal of graphene from water. In this paper, GO degradation via photo-Fenton reaction under different conditions was carried out...
January 19, 2017: Environmental Technology
Chengyong Zhong, Yuanping Chen, Yuee Xie, Yi-Yang Sun, Shengbai Zhang
A semi-Dirac semimetal is a material that exhibits linear band dispersion in one direction and quadratic band dispersion in the orthogonal direction and, therefore, hosts massless and massive fermions at the same point in the momentum space. While a number of interesting physical properties have been predicted in semi-Dirac semimetals, it has been rare to realize such materials in condensed matter. Based on the fact that some honeycomb materials are easily oxidized or chemically absorb other atoms, here, we theoretically propose an approach of modifying their band structures by covalent addition of group-VI elements and strain engineering...
January 19, 2017: Physical Chemistry Chemical Physics: PCCP
Andrea Knöller, Christian P Lampa, Felix von Cube, Tingying Helen Zeng, David C Bell, Mildred S Dresselhaus, Zaklina Burghard, Joachim Bill
Nature has evolved hierarchical structures of hybrid materials with excellent mechanical properties. Inspired by nacre's architecture, a ternary nanostructured composite has been developed, wherein stacked lamellas of 1D vanadium pentoxide nanofibres, intercalated with water molecules, are complemented by 2D graphene oxide (GO) nanosheets. The components self-assemble at low temperature into hierarchically arranged, highly flexible ceramic-based papers. The papers' mechanical properties are found to be strongly influenced by the amount of the integrated GO phase...
January 19, 2017: Scientific Reports
A Di Bernardo, O Millo, M Barbone, H Alpern, Y Kalcheim, U Sassi, A K Ott, D De Fazio, D Yoon, M Amado, A C Ferrari, J Linder, J W A Robinson
Electron pairing in the vast majority of superconductors follows the Bardeen-Cooper-Schrieffer theory of superconductivity, which describes the condensation of electrons into pairs with antiparallel spins in a singlet state with an s-wave symmetry. Unconventional superconductivity was predicted in single-layer graphene (SLG), with the electrons pairing with a p-wave or chiral d-wave symmetry, depending on the position of the Fermi energy with respect to the Dirac point. By placing SLG on an electron-doped (non-chiral) d-wave superconductor and performing local scanning tunnelling microscopy and spectroscopy, here we show evidence for a p-wave triggered superconducting density of states in SLG...
January 19, 2017: Nature Communications
Kai Chi, Zheye Zhang, Qi-Ying Lv, Chuyi Xie, Jian Xiao, Fei Xiao, Shuai Wang
In this work, we report the development of well-ordered hydrogenated CoMoO4 (H-CoMoO4) and hydrogenated Fe2O3 (H-Fe2O3) nanoplate arrays on 3D graphene foam (GF), and explore their practice application as binder-free electrodes in assembling flexible all-solid-state asymmetric supercapacitor (ASC) device. Our results show that the monolithic 3D porous GF prepared by solution casting method using Ni foam template possesses large surface area, superior electrical conductivity, and sufficient surface functional groups, which not only facilitate in situ growth of CoMoO4 and Fe2O3 nanoplates on it, but also contribute the double-layer capacitance of resultant supercapacitor...
January 19, 2017: ACS Applied Materials & Interfaces
Jiebing Li, Asif Hussain, Dengxin Li, Ming Yang, Shihong Xu
In this study, reduced graphene oxide (rGO) embedded with bimetallic nanoparticles of cobalt-manganese oxide (CoMn2O4) was fabricated by hydrothermal treatment. The obtained product was characterized and applied for the heterogeneous activation of peroxymonosulfate (PMS) to degrade acid orange 7 (AO7). The characterization results revealed that 10-20 nm nanosized CoMn2O4 was homogenously decorated on the surface of rGO. The effect of different CoMn2O4 loadings showed that catalyst with a CoMn2O4 contents higher than 20% performs stronger capability for catalytic degradation of AO7 compared to pure CoMn2O4...
January 18, 2017: Environmental Science and Pollution Research International
Jiong Wang, Xiaoming Ge, Zhaolin Liu, Larissa Thia, Ya Yan, Wei Xiao, Xin Wang
Molecular Co2+ ions were grafted onto doped graphene in a coordination environment, resulting in the formation of molecularly well-defined, highly active electrocatalytic sites at a heterogeneous interface for the oxygen evolution reaction (OER). The S dopants of graphene are suggested to be one of the binding sites and to be responsible for improving the intrinsic activity of the Co sites. The turnover frequency of such Co sites is greater than that of many Co-based nanostructures and IrO2 catalysts. Through a series of carefully designed experiments, the pathway for the evolution of the Co cation-based molecular catalyst for the OER was further demonstrated on such a single Co-ion site for the first time...
January 18, 2017: Journal of the American Chemical Society
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