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https://www.readbyqxmd.com/read/27911378/iridium-oxide-reduced-graphene-oxide-nanohybrid-thin-film-modified-screen-printed-electrodes-as-disposable-electrochemical-paper-microfluidic-ph-sensors
#1
Jiang Yang, Tae-Joon Kwak, Xiaodong Zhang, Robert McClain, Woo-Jin Chang, Sundaram Gunasekaran
A facile, controllable, inexpensive and green electrochemical synthesis of IrO2-graphene nanohybrid thin films is developed to fabricate an easy-to-use integrated paper microfluidic electrochemical pH sensor for resource-limited settings. Taking advantages from both pH meters and strips, the pH sensing platform is composed of hydrophobic barrier-patterned paper micropad (µPAD) using polydimethylsiloxane (PDMS), screen-printed electrode (SPE) modified with IrO2-graphene films and molded acrylonitrile butadiene styrene (ABS) plastic holder...
November 22, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910926/ionic-liquids-modified-graphene-oxide-composites-a-high-efficient-adsorbent-for-phthalates-from-aqueous-solution
#2
Xinguang Zhou, Yinglu Zhang, Zuteng Huang, Dingkun Lu, Anwei Zhu, Guoyue Shi
In 2015, more than 30% of erasers were found to contain a PAE content that exceeded the 0.1% limit established by the Quality and Technology Supervision Bureau of Jiangsu Province in China. Thus, strengthening the supervision and regulation of the PAE content in foods and supplies, in particular, remains necessary. Graphene oxide (GO) and its composites have drawn great interests as promising adsorbents for polar and nonpolar compounds. However, GO-based adsorbents are typically restricted by the difficult separation after treatment because of the high pressure in filtration and low density in centrifugation...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27906401/efficient-organic-photovoltaic-cells-on-a-single-layer-graphene-transparent-conductive-electrode-using-moox-as-an-interfacial-layer
#3
J H Du, H Jin, Z K Zhang, D D Zhang, S Jia, L P Ma, W C Ren, H M Cheng, P L Burn
The large surface roughness, low work function and high cost of transparent electrodes using multilayer graphene films can limit their application in organic photovoltaic (OPV) cells. Here, we develop single layer graphene (SLG) films as transparent anodes for OPV cells that contain light-absorbing layers comprised of the evaporable molecular organic semiconductor materials, zinc phthalocyanine (ZnPc)/fullerene (C60), as well as a molybdenum oxide (MoOx) interfacial layer. In addition to an increase in the optical transmittance, the SLG anodes had a significant decrease in surface roughness compared to two and four layer graphene (TLG and FLG) anodes fabricated by multiple transfer and stacking of SLGs...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906382/laser-patterned-functionalized-cvd-graphene-as-highly-transparent-conductive-electrodes-for-polymer-solar-cells
#4
Luca La Notte, Enrica Villari, Alessandro Lorenzo Palma, Alberto Sacchetti, Maria Michela Giangregorio, Giovanni Bruno, Aldo Di Carlo, Giuseppe Valerio Bianco, Andrea Reale
A five-layer (5L) graphene on a glass substrate has been demonstrated as a transparent conductive electrode to replace indium tin oxide (ITO) in organic photovoltaic devices. The required low sheet resistance, while maintaining high transparency, and the need of a wettable surface are the main issues. To overcome these, two strategies have been applied: (i) the p-doping of the multilayer graphene, thus reaching 25 Ω □(-1) or (ii) the O2-plasma oxidation of the last layer of the 5L graphene that results in a contact angle of 58° and a sheet resistance of 134 Ω □(-1)...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27905488/advanced-fabrication-of-chemically-bonded-graphene-tio2-continuous-fibers-with-enhanced-broadband-photocatalytic-properties-and-involved-mechanisms-exploration
#5
Qingzhe Zhang, Nan Bao, Xinqiang Wang, Xinde Hu, Xinhan Miao, Mohamed Chaker, Dongling Ma
In this article, a novel route for the synthesis of graphene/TiO2 continuous fibers (GTF) using force-spinning combined with water vapor annealing method is reported for the first time. The morphology, structure and optical properties of the composite were fully characterized. With a single step of heat treatment process using steam at ambient conditions, we were able to initiate a series of chemical reactions, such as reduction of graphene oxide (GO), crystallization of TiO2, formation of C-Ti bond, and introduction of oxygen vacancies into TiO2...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27905319/rapid-synthesis-of-rgo-conjugated-hierarchical-nico2o4-hollow-mesoporous-nanospheres-with-enhanced-glucose-sensitivity
#6
Bingrong Wang, Yang Cao, Yong Chen, Xiaoyong Lai, Juan Peng, Jinchun Tu, Xiaotian Li
NiCo2O4 nanospheres, a type of conjugated reduced graphene oxide (rGO), are compounded by a simple and easy synthesis of Cu2O/GO and fabricated NiCo2O4/rGO nanocomposites based on a Cu2O/GO template. The structure and morphology of the hierarchical NiCo2O4/rGO are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electrochemistry properties of NiCo2O4/rGO composites toward glucose are determined based on a glassy carbon electrode, and the results indicate that the hollow nanospheres of NiCo2O4/rGO could achieve high-sensitivity detections of glucose...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27904092/development-and-biosensor-applications-of-novel-functional-electrodes
#7
Shigehiro Takahashi
 Phenylboronic acid (PBA) derivatives have been used as alternatives to enzymes in the development of sugar-sensitive systems because the optical and electrochemical properties of these derivatives are significantly modulated upon sugar binding. This article reviews the voltammetric properties of sugar sensors prepared using dithiobis (4-butyrylamino-m-phenylboronic acid) (DTBA-PBA)-modified electrodes and PBA-appended layer-by-layer film-modified electrodes. In addition, the redox properties of reduced graphene oxide (rGO)-modified glassy carbon electrodes (GCEs) are discussed...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27903088/enhanced-thermal-properties-with-graphene-oxide-in-the-urea-formaldehyde-microcapsules-containing-paraffin-pcms
#8
Zhen Qiao, Jian Mao
In this study, compact urea-formaldehyde microcapsules containing paraffin (UFP) phase change materials (PCMs) were prepared via in situ polymerization. The thermal conductivity of the PCMs was enhanced without influencing their enthalpy by adding graphene oxide (GO). Two modification methods were investigated: One in which GO is added to the inside of microcapsules, defined as "paraffin/GO@UF composite"; and another in which GO is coated onto the surface of shell, defined as "paraffin@UF/GO composite". The GO sheets were visible in SEM images of paraffin@UF/GO composite...
December 1, 2016: Journal of Microencapsulation
https://www.readbyqxmd.com/read/27901397/a-systems-toxicology-approach-reveals-the-wnt-mapk-crosstalk-pathway-mediated-reproductive-failure-in-caenorhabditis-elegans-exposed-to-graphene-oxide-go-but-not-to-reduced-graphene-oxide-rgo
#9
Nivedita Chatterjee, Young-Ho Kim, Jisu Yang, Carlos P Roca, Sang Woo Joo, Jinhee Choi
The potential hazards of graphene nanomaterials were investigated by exposing the nematode Caenorhabditis elegans to graphene oxide (GO) and reduced graphene oxide (rGO). The underlying mechanisms of the nano-bio interaction were addressed with an integrated systems toxicology approach using global transcriptomics, network-based pathway analysis, and experimental validation of the in-silico-derived hypotheses. Graphene oxide was found to reduce the worms' reproductive health to a greater degree than rGO, but it did not affect survival (24 h endpoint)...
November 30, 2016: Nanotoxicology
https://www.readbyqxmd.com/read/27898378/ag-n-doped-reduced-graphene-oxide-incorporated-with-molecularly-imprinted-polymer-an-advanced-electrochemical-sensing-platform-for-salbutamol-determination
#10
Junhua Li, Zhifeng Xu, Mengqin Liu, Peihong Deng, Siping Tang, Jianbo Jiang, Haibo Feng, Dong Qian, Lingzhi He
In this work, the metallic silver and non-metallic nitrogen co-doped reduced graphene oxide (Ag-N-RGO) was first synthesized by a simple and cost-effective strategy, and then a molecularly imprinted polymer (MIP) was formed in situ at the surface of the prepared composite via electropolymerization of o-phenylenediamine in the presence of salbutamol as the template molecule. The electrochemical characterizations demonstrate that the bifunctional graphene-based composite shows improved catalytic performance than that of pristine graphene doped with one-component or none...
November 10, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27897361/soluble-graphene-nanoribbons-from-planarization-of-oligophenylenes
#11
Choong Ping Sen, Suresh Valiyaveettil
A solution-based chemical synthesis of two graphene nanoribbons with armchair edge is reported. The precursor oligophenylene molecules were synthesized and subjected to oxidative cyclodehydrogenation to afford target molecules, G-1 and G-2. These molecules have good solubility in organic solvents, and showed a large red-shift in absorption edge (up to 185 nm) and emission maximum (up to 125 nm) after planarization. Fibrous structures were formed through self-assembly of molecules via columnar π - π stacking...
November 29, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27896864/pyroprotein-based-electronic-textiles-with-high-stability
#12
Jun Woo Jeon, Se Youn Cho, Yu Jin Jeong, Dong Seok Shin, Na Rae Kim, Young Soo Yun, Hyun-Tae Kim, Soo Bong Choi, Won G Hong, Hae Jin Kim, Hyoung-Joon Jin, Byung Hoon Kim
Thermally reducible pyroprotein-based electronic textiles (e-textiles) are fabricated using graphene oxide and a pyroprotein such as cocoon silk and spider web without any chemical agents. The electrical conductivity of the e-textile is 11.63 S cm(-1) , which is maintained even in bending, washing, and temperature variation.
November 29, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27896345/high-performance-flexible-strain-sensor-based-on-self-locked-overlapping-graphene-sheets
#13
Dan-Yang Wang, Lu-Qi Tao, Ying Liu, Tian-Yu Zhang, Yu Pang, Qian Wang, Song Jiang, Yi Yang, Tian-Ling Ren
Strain sensors have been widely used in the fields of wearable devices, robot arms, medical sensing, bio-sensing, artificial skin and so on, but the existing strain sensors have some shortcomings such as a limited gauge factor (GF) or strain range. We fabricate a novel and flexible strain sensor with high performance based on self-locked overlapping graphene sheets (SOGS) which can be used for wearable devices. Polydimethylsiloxane (PDMS) is used to lock the overlapping graphene sheets, and then the graphene can be stretched and achieve an ultrahigh GF...
November 29, 2016: Nanoscale
https://www.readbyqxmd.com/read/27894754/composite-of-cu-metal-nanoparticles-multiwall-carbon-nanotubes-reduced-graphene-oxide-as-a-novel-and-high-performance-platform-of-the-electrochemical-sensor-for-simultaneous-determination-of-nitrite-and-nitrate
#14
Hasan Bagheri, Ali Hajian, Mosayeb Rezaei, Ali Shirzadmehr
In the present research, we aimed to fabricate a novel electrochemical sensor based on Cu metal nanoparticles on the multiwall carbon nanotubes-reduced graphene oxide nanosheets (Cu/MWCNT/RGO) for individual and simultaneous determination of nitrite and nitrate ions. The morphology of the prepared nanocomposite on the surface of glassy carbon electrode (GCE) was characterized using various methods including scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical impedance spectroscopy...
November 21, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27894235/energy-efficient-graphene-based-high-performance-capacitors
#15
Joonwon Bae, Chang-Soo Lee, Oh Seok Kwon
Graphene (GRP) is an interesting class of nano-structured electronic materials for various cutting-edge applications. To date, extensive research activities have been performed on the investigation of diverse properties of GRP. The incorporation of this elegant material can be very lucrative in terms of practical applications in energy storage/conversion systems. Among various those systems, high performance electrochemical capacitors (ECs) have become popular due to the recent need for energy efficient and portable devices...
October 27, 2016: Recent Patents on Nanotechnology
https://www.readbyqxmd.com/read/27892515/heteronanostructured-co-carbon-nanotubes-graphene-ternary-hybrids-synthesis-electromagnetic-and-excellent-microwave-absorption-properties
#16
Xiaosi Qi, Qi Hu, Hongbo Cai, Ren Xie, Zhongchen Bai, Yang Jiang, Shuijie Qin, Wei Zhong, Youwei Du
In order to explore high efficiency microwave absorption materials, heteronanostructured Co@carbon nanotubes-graphene (Co@CNTs-G) ternary hybrids were designed and produced through catalytic decomposition of acetylene at the designed temperature (400, 450, 500 and 550 °C) over Co3O4/reduced graphene oxide (Co3O4/RGO). By regulating the reaction temperatures, different CNT contents of Co@CNTs-G ternary hybrids could be synthesized. The investigations indicated that the as-prepared heteronanostructured Co@CNTs-G ternary hybrids exhibited excellent microwave absorption properties, and their electromagnetic and microwave absorption properties could be tuned by the CNT content...
November 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27891534/graphene-oxide-nanosheets-stimulate-ruffling-and-shedding-of-mammalian-cell-plasma-membranes
#17
Chao Sun, Devin L Wakefield, Yimo Han, David A Muller, David A Holowka, Barbara A Baird, William R Dichtel
Graphene oxide (GO) has attracted intense interest for use in living systems and environmental applications. GO's compatibility with mammalian cells is sometimes inferred from its low cytotoxicity, but such conclusions ignore non-lethal effects that will influence GO's utility. Here we demonstrate, with rat basophilic leukemia (RBL) cells, profound plasma membrane (PM) ruffling and shedding induced by GO using confocal and live cell fluorescence microscopy, as well as scanning electron microscopy. These membrane structures contain immunoglobulin E receptors, are resistant to detergents, and lack detectable fluorescence labeling of F-actin and fibronectin...
August 11, 2016: Chem
https://www.readbyqxmd.com/read/27890296/analytic-solutions-for-colloid-transport-with-time-and-depth-dependent-retention-in-porous-media
#18
Feike J Leij, Scott A Bradford, Antonella Sciortino
Elucidating and quantifying the transport of industrial nanoparticles (e.g. silver, carbon nanotubes, and graphene oxide) and other colloid-size particles such as viruses and bacteria is important to safeguard and manage the quality of the subsurface environment. Analytic solutions were derived for aqueous and solid phase colloid concentrations in a porous medium where colloids were subject to advective transport and reversible time and/or depth-dependent retention. Time-dependent blocking and ripening retention were described using a Langmuir-type equation with a rate coefficient that respectively decreased and increased linearly with the retained concentration...
November 1, 2016: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/27889098/reply-for-comment-on-adsorptive-removal-of-methylene-blue-by-rhamnolipid-functionalized-graphene-oxide-from-wastewater
#19
Zhibin Wu, Hua Zhong, Xingzhong Yuan, Hou Wang, Lele Wang, Xiaohong Chen, Guangming Zeng, Yan Wu
No abstract text is available yet for this article.
November 18, 2016: Water Research
https://www.readbyqxmd.com/read/27888310/determination-of-trace-bisphenol-a-in-environmental-water-by-high-performance-liquid-chromatography-using-magnetic-reduced-graphene-oxide-based-solid-phase-extraction-coupled-with-dispersive-liquid-liquid-microextraction
#20
Danping Li, Xiaoguo Ma, Rui Wang, Yumian Yu
Bisphenol A (BPA), an endocrine-disrupting chemical, has received much attention from researchers and the general public. In this paper, a novel method of determining BPA at trace levels was developed, using magnetic reduced graphene oxide (rGO-Fe3O4)-based solid-phase extraction coupled with dispersive liquid-liquid microextraction (DLLME), followed by high-performance liquid chromatographic determination. The rGO-Fe3O4 was prepared and then characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and vibrating sample magnetometry...
November 25, 2016: Analytical and Bioanalytical Chemistry
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