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graphene oxide

Kunfeng Chen, Dongfeng Xue, Sridhar Komarneni
Nanoclay assisted electrochemical exfoliation was developed to in-situ form functionalized graphene electrode materials from pencil core with different ratios of graphite and clay. This method made a positive transformation from solid graphite to graphene colloidal solution, which can be used to construct binder- and additive-free thin-film electrodes. Exfoliated graphene can be served as both conductive current collector (film resistance of 33Ω/square) and electrode materials. Graphene thin-film electrodes from pencil cores displayed higher capacity of 224 than 80mAh/g of that from pure graphite...
October 15, 2016: Journal of Colloid and Interface Science
Jingquan Liu, Hongjing Ma, Huihui Zhu, Zhen Liu, Degang Jiang, Jizhen Zhang, Wenrong Yang
The determination of oxygeneous groups, conjugated area ratio and reduction efficiency of graphene oxide (GO) is a difficult task because of its heterogeneous structure. Herein, we describe a novel approach for the detailed understanding of the surface chemistry of GO using pyrene as a fluorescent probe via π-π stacking interaction.
October 21, 2016: Chemistry: a European Journal
Ondřej Jankovský, Michal Nováček, Jan Luxa, David Sedmidubský, Vlastimil Fila, Martin Pumera, Zdeněk Sofer
A new member of the family of graphene derivatives, namely, graphene acid with a composition close to C1 (COOH)1 , was prepared by oxidation of graphene oxide. The synthetic procedure is based on repeated oxidation of graphite with potassium permanganate in an acidic environment. The oxidation process was studied in detail after each step. The multiple oxidations led to oxidative removal of other oxygen functional groups formed in the first oxidation step. Detailed chemical analysis showed only a minor amount of other oxygen-containing functional groups such as hydroxyl and the dominant presence of carboxyl groups in a concentration of about 30 wt %...
October 21, 2016: Chemistry: a European Journal
Da Huang, Zhi Yang, Xiaolin Li, Liling Zhang, Jing Hu, Yanjie Su, Nantao Hu, Guilin Yin, Dannong He, Yafei Zhang
Graphene is an ideal candidate for gas sensing due to its excellent conductivity and large specific surface areas. However, it usually suffers from sheet stacking, which seriously debilitates its sensing performance. Herein, we demonstrate a three-dimensional conductive network based on stacked SiO2@graphene core-shell hybrid frameworks for enhanced gas sensing. SiO2 spheres are uniformly encapsulated by graphene oxide (GO) through an electrostatic self-assembly approach to form SiO2@GO core-shell hybrid frameworks, which are reduced through thermal annealing to establish three-dimensional (3D) conductive sensing networks...
October 20, 2016: Nanoscale
Xin Tian, Zaixing Yang, Guangxin Duan, Anqing Wu, Zonglin Gu, Leili Zhang, Chunying Chen, Zhifang Chai, Cuicui Ge, Ruhong Zhou
Graphene and graphene-based nanomaterials are broadly used for various biomedical applications due to their unique physiochemical properties. However, how graphene-based nanomaterials interact with biological systems has not been thoroughly studied. This study shows that graphene oxide (GO) nanosheets retard A549 lung carcinoma cell migration through nanosheet-mediated disruption of intracellular actin filaments. After GO nanosheets treatment, A549 cells display slower migration and the structure of the intracellular actin filaments is dramatically changed...
October 20, 2016: Small
Hangil Lee, Yeonwoo Kim, Min Ji Kim, Ki-Jeong Kim, Byung-Kwon Kim
In order to compare the catalytic activities of reduced graphene oxide (rGO), graphene oxide (GO), and graphene, we conducted oxidation of 2-aminothiophenol (2-ATP) and reduction of nitrobenzene (NB) in their presence by using high-resolution photoemission spectroscopy (HRPES). In addition, we determined conversion rates of CO to CO2 in the presence of these catalysts by performing a residual gas analyzer (RGA) under a UHV condition, Orange II and methylene blue degradations UV-vis spectrophotometry, and electrochemistry (EC) measurements in an aqueous solution, as well as by obtaining cyclic voltammograms and determining the change of the condition of electrodes before and after the oxidation of 2-ATP...
October 20, 2016: Scientific Reports
Amira Alazmi, Omar El Tall, Shahid Rasul, Mohamed N Hedhili, Shashikant P Patole, Pedro M F J Costa
The impact of post-synthesis processing in reduced graphene oxide materials for supercapacitor electrodes has been analyzed. A comparative study of vacuum, freeze and critical point drying was carried out for hydrothermally reduced graphene oxide demonstrating that the optimization of the specific surface area and preservation of the porous network are critical to maximize its supercapacitance performance. As described below, using a supercritical fluid as the drying medium, unprecedented values of the specific surface area (364 m(2) g(-1)) and supercapacitance (441 F g(-1)) for this class of materials have been achieved...
October 20, 2016: Nanoscale
Xiaohu Zheng, Lei Gao, Quanzhou Yao, Qunyang Li, Miao Zhang, Xiaoming Xie, Shan Qiao, Gang Wang, Tianbao Ma, Zengfeng Di, Jianbin Luo, Xi Wang
Two-dimensional (2D) materials possess outstanding lubrication property with their thicknesses down to a few atomic layers, but they are easily susceptible to sliding induced degradation or ubiquitous chemical modification. Maintaining the superior lubricating performance of 2D materials in a harsh working environment is highly desirable yet grandly challenging. Here we show that by proper alignment of graphene on a Ge(111) substrate, friction of graphene could be well preserved at an ultra-low level even after fluorination or oxidation...
October 19, 2016: Nature Communications
Zhenning Yu, Lei Zou, Yanli Chen, Jianzhuang Jiang
A facile approach was developed for preparing the multilayer hybrid films of mixed (phthalocyaninato)(porphyrinato) europium (III) triple-decker compound (Pc)Eu(Pc)Eu[trans-T(COOCH3)2PP] (1) and graphene oxide (GO) using the solution-processing QLS method. Combination in the nature of relatively high conductivity and great surface area for GO with the electroactive and semiconductive triple-decker compound in ITO electrode renders the hybrid film excellent sensing property for H2O2, due to the optimized triple-decker molecular packing in the uniform-sized nanoparticles (ca...
October 19, 2016: ACS Applied Materials & Interfaces
Kan Zhang, Shansheng Yu, Baoming Jv, Weitao Zheng
In this work, the adsorption of Rhodamine 6G molecules on some graphene substrates is investigated using density functional theory. Some simple models, such as those of perfect graphene, defective graphene, *O/*OH modified graphene and B/N doping graphene, are constructed as substrates to simulate graphene oxide and B/N doping graphene sheets. It is demonstrated that the interactions of Rhodamine 6G molecules with graphene materials are strong. In particular, the amine group of Rhodamine 6G molecules can favor the formation of a chemical bond with some graphene substrates characterized by under-coordinated atoms...
October 19, 2016: Physical Chemistry Chemical Physics: PCCP
Haiyang Sheng, Min Wei, Alyssa D'Aloia, Gang Wu
Current supercapacitors suffer from low energy density due to the high degree of microporosity and insufficient hydrophilicity of their carbon electrodes. Development of a supercapacitor capable of simultaneously storing as much energy as a battery, along with providing sufficient power and long cycle stability would be valued for energy storage applications and innovations. Differing from often studied reduced graphene oxides, in this work we identified an inexpensive heteroatom polymer (polyaniline-PANI) as a carbon/nitrogen precursor, and applied a controlled thermal treatment at elevated temperature to convert PANI into 3D high-surface-area graphene-sheet-like carbon materials...
October 18, 2016: ACS Applied Materials & Interfaces
Ning Xia, Xin Wang, Lin Liu
Human chorionic gonadotropin (hCG) has been regarded as a biomarker for the diagnosis of pregnancy and some cancers. Because the currently used methods (e.g., disposable Point of Care Testing (POCT) device) for hCG detection require the use of many less stable antibodies, simple and cost-effective methods for the sensitive and selective detection of hCG have always been desired. In this work, we have developed a graphene oxide (GO)-based fluorescent platform for the detection of hCG using a fluorescein isothiocyanate (FITC)-labeled hCG-specific binding peptide aptamer (denoted as FITC-PPLRINRHILTR) as the probe, which can be manufactured cheaply and consistently...
October 13, 2016: Sensors
Chunyang Zhou, Dali Liu, Changtong Wu, Shaojun Dong, Erkang Wang
In this work, we have successfully realized the multi-valued logic circuits including ternary INHIBIT and ternary OR logic gates in an enzyme-free condition by integration of graphene oxide and DNA for the first time. Compared to the binary logic gate with two states of "0" and "1", the multi-valued logic gate contains three different states of "0" and "1" and "2", which can increase the information content in a system and further improve the ability of information processing. Such type of multi-valued logic operations provides a wilder field of vision towards DNA-based algebra logical operations to make the applications more accurate with complexity reduction and accelerate the development of advanced logic gates...
October 18, 2016: ACS Applied Materials & Interfaces
Chun Fang Ma, Qiang Gao, Kai Sheng Xia, Zhi Yuan Huang, Bo Han, Cheng Gang Zhou
The development of bilirubin adsorbents with high adsorption efficiencies towards albumin-bonded bilirubin is still a considerable challenge. In this work, a three-dimensionally porous graphene (3D-pGR) has been fabricated through a simple carbon dioxide (CO2) activation of thermally exfoliated graphite oxide (EGO). Intriguingly, the resultant 3D-pGR material showed hierarchically micro-meso-macroporous structure, high specific surface area of up to 843m(2)g(-1), and large pore volume as high as 2.71cm(3)g(-1)...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
Mingqiang Wang, Shuai Zhang, Yuanjun Song, Jidong Dong, Huawei Wei, Huaquan Xie, Xiaojiao Fang, Lu Shao, Yudong Huang, Zaixing Jiang
Graphene oxide nanoribbons (GONRs) are one of the most promising carbon based materials. The integration of 2D GONR sheets into macroscopic materials, such as continuous fibers or film, leads the way in translating the good properties of individual GONR sheets into macroscopic and ordered materials for future applications. In this study, we first report the fabrication of GONR fibers utilizing GONR sheets as the raw material without any supporting surfactant or polymer. The method of fabricating fibers is referred to as '3D solution printing'...
October 17, 2016: Nanotechnology
Wei-Yu Kong, Guo-An Wu, Kui-Yuan Wang, Teng-Fei Zhang, Yi-Feng Zou, Dan-Dan Wang, Lin-Bao Luo
A deep UV light photodetector is assembled by coating multilayer graphene on beta-gallium oxide (β-Ga2 O3 ) wafer. Optoelectronic analysis reveals that the heterojunction device is virtually blind to light illumination with wavelength longer than 280 nm, but is highly sensitive to 254 nm light with very good stability and reproducibility.
October 17, 2016: Advanced Materials
Katarzyna Szot-Karpińska, Piotr Golec, Adam Lesniewski, Barbara Palys, Frank Marken, Joanna Niedziółka-Jönsson, Grzegorz Wegrzyn, Marcin Łoś
With the advent of nanotechnology, carbon nanomaterials such as carbon nanofibers (CNF) have aroused substantial interest in various research fields including energy storage and sensing. Further improvement of their properties might be achieved via application of viral particles such as bacteriophages. In this report we present a filamentous M13 bacteriophage, with a point mutation in gene VII (pVII-mutant-M13), that selectively binds to the carbon nanofibers to form 3D structures. The phage-display technique was utilized for the selection of the pVII-mutant-M13 phage from the phage display peptide library...
October 17, 2016: Bioconjugate Chemistry
Christopher J Benjamin, Kyle J Wright, Scott C Bolton, Seok-Hee Hyun, Kyle Krynski, Mahima Grover, Guimei Yu, Fei Guo, Tamara L Kinzer-Ursem, Wen Jiang, David H Thompson
We report the fabrication of transmission electron microscopy (TEM) grids bearing graphene oxide (GO) sheets that have been modified with N(α), N(α)-dicarboxymethyllysine (NTA) and deactivating agents to block non-selective binding between GO-NTA sheets and non-target proteins. The resulting GO-NTA-coated grids with these improved antifouling properties were then used to isolate His6-T7 bacteriophage and His6-GroEL directly from cell lysates. To demonstrate the utility and simplified workflow enabled by these grids, we performed cryo-electron microscopy (cryo-EM) of His6-GroEL obtained from clarified E...
October 17, 2016: Scientific Reports
Yi Yang, Juan Wen, Liqiang Guo, Xiang Wan, Peifu Du, Ping Feng, Yi Shi, Qing Wan
Emulating neural behaviors at the synaptic level is of great significance for building neuromorphic computational systems and realizing artificial intelligence. Here, oxide-based electric-double-layer (EDL) thin-film transistors were fabricated by using 3-triethoxysilylpropylamine modified graphene oxide (KH550-GO) electrolyte as the gate dielectrics. Resulting from the EDL effect and electrochemical doping between mobile protons and the indium-zinc-oxide channel layer, long-term synaptic plasticity was emulated in our devices...
October 17, 2016: ACS Applied Materials & Interfaces
Zhen Zhang, Yongling An, Xiaoyan Xu, Chenglong Dong, Jinkui Feng, Lijie Ci, Shenglin Xiong
Graphene@nitrogen doped carbon@ultrafine TiO2 nanoparticles (G-NC@TiO2) with porous structure are obtained through annealing the precursor of graphene oxide/metal-organic frameworks (MOFs) for the first time. As an anode material for sodium ion batteries (SIB), the G-NC@TiO2 composite can deliver an excellent capacity retention of 93% even after 5000 cycles, and a superior rate capability.
October 17, 2016: Chemical Communications: Chem Comm
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