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Graphen Oxide

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https://www.readbyqxmd.com/read/30340396/self-assembly-synthesis-of-silver-nanowires-graphene-nanocomposite-and-its-effects-on-the-performance-of-electrically-conductive-adhesive
#1
Tao Xu, Jiayu Chen, Wenhui Yuan, Yinhua Liu, Yongjun Sun, Huijun Wu, Xiaoqing Zhou
Among recent advances in electronic packaging technologies, electrically conductive adhesives (ECAs) attract most researchers' attention, as they are environment-friendly and simple to apply. ECAs also have a lower operating temperature and volume resistivity compared with conventional electronic conductive adhesives. In ECAs, the conducting fillers play a significant role in improving conductivity and strength. In this work, as filler additives, the silver nanowires/graphene nanocomposites (AgNWs-GNs) were successfully fabricated via a facile self-assembly method...
October 18, 2018: Materials
https://www.readbyqxmd.com/read/30340013/antibacterial-properties-of-chitosan-chloride-graphene-oxide-composites-modified-quartz-sand-filter-media-in-water-treatment
#2
Xufei Li, Junzhi Sun, Yangli Che, Yan Lv, Fang Liu
In order to control bacterial pollution in water treatment, it is necessary to prepare efficient antibacterial materials. Novel chitosan chloride-graphene oxide (CSCl@GO) composites were prepared via a one-step solution blending method. The composites were characterized by FT-IR, XRD and TEM techniques. The antibacterial mechanism of CSCl@GO composites was investigated using gram-negative bacteria E. coli and gram-positive bacteria S. aureus as two model microorganisms. The antibacterial properties of CSCl@GO composites for complex bacteria in the cooling water system were researched...
October 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30339357/highly-electrically-conductive-three-dimensional-ti3c2tx-mxene-reduced-graphene-oxide-hybrid-aerogels-with-excellent-electromagnetic-interference-shielding-performances
#3
Sai Zhao, Hao-Bin Zhang, Jia-Qi Luo, Qi-Wei Wang, Bin Xu, Song Hong, Zhong-Zhen Yu
Two-dimensional transition metal carbides/carbonitrides (MXenes) networks with both superb electrical conductivity and hydrophilicity are promising for fabricating multifunctional nanomaterials and nanocomposites. However, construction of three-dimensional (3D) and lightweight MXene macroscopic assemblies with excellent electrical conductivity and mechanical performances has not been realized due to the weak gelation capability of MXene sheets. Herein, we demonstrate an efficient approach for constructing highly conductive 3D Ti3C2Tx porous architectures by graphene oxide-assisted hydrothermal assembly followed by directional-freezing and freeze-drying...
October 19, 2018: ACS Nano
https://www.readbyqxmd.com/read/30339344/carbon-materials-with-zigzag-and-armchair-edges
#4
Yasuhiro Yamada, Miki Kawai, Hideki Yorimitsu, Shinya Otsuka, Motoharu Takanashi, Satoshi Sato
Carbon materials such as graphene and graphene nanoribbon with zigzag and armchair edges have attracted much attention because of various applications such as electronics, batteries, adsorbents, and catalyst supports. Preparation of carbon materials with different edge structure at large scale is essential for the future of carbon materials, but it is generally difficult and expensive because of the necessity of organic synthesis on metal substrates. This work demonstrated a simple preparation method of carbon materials with zigzag and armchair edges with/without non-metallic silica supports from aromatic compounds such as tetracene with zigzag edges and chrysene with armchair edges and also determined the edge structures in detail by three types of analyses such as (1) reactive molecular dynamic simulation (ReaxFF), (2) Raman and infrared (IR) spectra combined with calculation of spectra, and (3) reactivity analyzed by oxidative gasification using thermogravimetric analysis...
October 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30338906/myths-and-realities-of-graphene-oxide-carbocatalyst-or-reagent
#5
Stanislav Presolski, Martin Pumera
Metal-free heterogeneous carbon-based materials have the potential to facilitate a wide range of organic transformations in an economical and environmentally-friendly manner. Often times, however, the mechanism of their action is obfuscated by their ill-defined nature, so careful analysis of the reaction products is essential before they can be labelled 'catalysts' according to IUPAC's definition. We present here our findings on the archetypal 'carbocatalytic' conversion of benzyl alcohol to benzaldehyde, in which graphene oxide is reduced and a major side product - dibenzyl ether, is also formed...
October 19, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30338685/exploring-the-aggregation-mechanism-of-graphene-oxide-in-the-presence-of-radioactive-elements-experimental-and-theoretical-studies
#6
Yang Gao, Ke Chen, Xue Mei Ren, Ahmed Alsaedi, Tasawar Hayat, Changlun Chen
In this study, the aggregation kinetics, aggregate morphology and aggregation mechanisms of graphene oxide (GO) in the presence of Cs¬+, Sr2+, UO22+, Eu3+, or Th4+ were characterized by using time-resolved dynamic light scattering, transmission electron microscopy-element mapping, re-dispersion of GO aggregate, and the density functional theory calculations. The destabilization capability of Cs¬+, Sr2+, UO22+, Eu3+, and Th4+ and the corresponding critical coagulation concentrations values were obtained for the first time...
October 19, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/30337616/fabrication-of-chitosan-magnetite-graphene-oxide-composites-as-a-novel-bioadsorbent-for-adsorption-and-detoxification-of-cr-vi-from-aqueous-solution
#7
Bei Zhang, Runtao Hu, Dejun Sun, Tao Wu, Yujiang Li
By utilizing the synergistic effect of chitosan (CS), magnetite (Fe3 O4 ) particles, and graphene oxide (GO), a series of efficient and eco-friendly chitosan/magnetite-graphene oxide (CS/MGO) composites were fabricated through a facile chemical route. First, Fe3 O4 particles were chemically deposited on the surface of GO to fabricate MGO hybrid. Then, chitosan was attached on MGO sheets, assembling to CS/MGO composites. According to the results of characterization, the covalent Fe-O-C bonds, electrostatic attraction, and hydrogen bonding between GO, Fe3 O4 , and chitosan ensure excellent structural stability and physico-chemical properties...
October 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30336668/toxicity-of-go-to-freshwater-algae-in-the-presence-of-al2o3-particles-with-different-morphologies-importance-of-heteroaggregation
#8
Jian Zhao, Yanhui Dai, Zhenyu Wang, Wenting Ren, Yongpeng Wei, Xuesong Cao, Baoshan Xing
The roles of Al2O3 particles with different morphologies in altering graphene oxide (GO) toxicity to Chlorella pyrenoidosa were investigated. Algal growth inhibition by GO with co-existing Al2O3 particles was much lower than the sum of inhibitions from the individual materials for all the three Al2O3, showing the toxicity mitigation by Al2O3. The lowest GO toxicity was observed at the concentrations of 300, 150 and 100 mg/L for Al2O3 nanoparticles (NPs, 8-10 nm), bulk particles (BPs, 100-300 nm), and fibers (diameter: 10 nm; length: 400 nm), respectively...
October 18, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/30336611/a-unique-strategy-for-polyethylene-glycol-hybrid-carbon-foam-phase-change-materials-morphologies-thermal-properties-and-energy-storage-behavior
#9
Xiaolong Su, Shikui Jia, Guowei Lv, Demei Yu
Polyethylene glycol (PEG)/hybrid carbon foam (CF) phase change materials (PCMs) were prepared by integrating PEG into CF via dynamic-vacuum impregnation. The hybrid CF was first synthesized by mixtures of graphene oxide (GO) and carbon nanotubes (CNTs) with different volume ratios. The morphologies, chemical structures, thermal conductivities, shape-stabilization levels, and photo-thermal energy conversion levels of these composite PCMs were characterized systematically. The prepared composite PCMs exhibited good shape-stabilization levels and showed their original shapes without any PEG leakage...
October 17, 2018: Materials
https://www.readbyqxmd.com/read/30336571/green-preparation-of-high-yield-fluorescent-graphene-quantum-dots-from-coal-tar-pitch-by-mild-oxidation
#10
Quanrun Liu, Jingjie Zhang, He He, Guangxu Huang, Baolin Xing, Jianbo Jia, Chuanxiang Zhang
Coal tar pitch (CTP), a by-product of coking industry, has a unique molecule structure comprising an aromatic nucleus and several side chains bonding on this graphene-like nucleus, which is very similar to the structure of graphene quantum dots (GQDs). Based on this perception, we develop a facile approach to convert CTP to GQDs only by oxidation with hydrogen peroxide under mild conditions. One to three graphene layers, monodisperse GQDs with a narrow size distribution of 1.7 ± 0.4 nm, are obtained at high yield (more than 80 wt...
October 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30336549/preparation-and-characterization-of-functionalized-graphene-oxide-carrier-for-sirna-delivery
#11
Jing Li, Xu Ge, Chunying Cui, Yifan Zhang, Yifan Wang, Xiaoli Wang, Qi Sun
A successful siRNA delivery system is dependent on the development of a good siRNA carrier. Graphene oxide (GO) has gained great attention as a promising nanocarrier in recent years. It has been reported that GO could be used to deliver a series of drugs including synthetic compounds, proteins, antibodies, and genes. Our previous research indicated that functionalized GO could deliver siRNA into tumor cells and induce a gene silencing effect, to follow up the research, in this research, GO-R8/cRGDfV(GRcR) was designed and prepared for VEGF-siRNA delivery as a novel carrier...
October 17, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30336321/construction-of-z-scheme-g-c-3-n-4-rgo-wo-3-with-in-situ-photoreduced-graphene-oxide-as-electron-mediator-for-efficient-photocatalytic-degradation-of-ciprofloxacin
#12
Na Lu, Pu Wang, Yan Su, Hongtao Yu, Ning Liu, Xie Quan
Z-scheme photocatalyst g-C3 N4 /RGO/WO3 with reduced graphene oxide (RGO) as the electron mediator was synthesized via a facile photoreduction method. According the results of photoluminescence (PL), electrochemical impedance spectroscopy (EIS) and photocurrent response, g-C3 N4 /RGO/WO3 presents more efficient separation of charges and enhanced electronic mobility than g-C3 N4 /WO3 , g-C3 N4 and WO3 , which benefits from the excellent electron transfer property of RGO. Reactive species trapping experiments and electron paramagnetic resonance (EPR) test demonstrated that superoxide radical (O2 - ) and hydroxyl radical (OH) were produced because of the high redox capacities caused by the unique transfer behaviors of charges in Z-scheme photocatalyst g-C3 N4 /RGO/WO3 ...
October 11, 2018: Chemosphere
https://www.readbyqxmd.com/read/30336059/graphene-encapsulated-dna-nanostructure-preservation-of-topographic-features-at-high-temperature-and-site-specific-oxidation-of-graphene
#13
Karen B Ricardo, Haitao Liu
This paper reports the effect of graphene encapsulation on the thermal stability of DNA nanostructures and the thermal oxidation of graphene in the presence of DNA nanostructures. Triangular-shaped DNA nanostructures were deposited onto a Si/SiO2 substrate and covered with single-layer graphene. The apparent height of the DNA nanostructure significantly decreased upon thermal annealing at 250 °C and higher temperatures. The topographical features of the DNA nanostructure, as measured by atomic force microscopy (AFM), disappeared after annealing at 300 °C for 5 h but reappeared after 23 h...
October 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30335972/plasmonic-3d-semiconductor-metal-nanopore-arrays-for-reliable-sers-detection-and-in-site-catalytic-reaction-monitoring
#14
Maofeng Zhang, Tun Chen, Yongkai Liu, Jiluan Zhang, Haoran Sun, Jian Yang, Jiping Zhu, Jia-Qin Liu, Yu-Cheng Wu
It is urgent to develop a rapid, reliable and in-site determination method to detect or monitor trace amounts of toxic substances in the field. Here, we report an alternative surface-enhanced Raman scattering (SERS) method coupled with a portable Raman device on a plasmonic three-dimension (3D) hot spots sensing surface. Plasmonic AgNPs were uniformly deposited on a 3D TiO2 nanopore arrays as sensitive SERS substrate, and further coated with graphene oxide (GO). We demonstrate the plasmon-induced SERS enhancement (5...
October 18, 2018: ACS Sensors
https://www.readbyqxmd.com/read/30335968/a-facile-label-free-and-universal-biosensor-platform-based-on-target-induced-graphene-oxide-constrained-dna-dissociation-coupling-with-improved-strand-displacement-amplification
#15
Zhijun Huang, Zewei Luo, Junman Chen, Ya Xu, Yixiang Duan
In this work, we report a low-cost and easy operation biosensor platform capable of detection of various analytes with high sensitivity and good selectivity. By ingeniously assigning the specific aptamer into a primer-template integrated DNA template, and using monolayer graphene oxide as a reversible and nonspecific inhibitor, the simple biosensor platform is set up. Without target, DNA template is constrained by the graphene oxide sheet and result in low signal. In the presence of target, the constrained DNA template is released from the graphene oxide surface via target-induced aptamer conformational change, and further amplified through the improved strand displacement amplification reaction...
October 18, 2018: ACS Sensors
https://www.readbyqxmd.com/read/30335365/energetic-performance-of-optically-activated-aluminum-graphene-oxide-composites
#16
Yue Jiang, Sili Deng, Sungwook Hong, Jiheng Zhao, Sidi Huang, Chi-Chin Wu, Jennifer L Gottfried, Ken-Ichi Nomura, Ying Li, Subodh Tiwari, Rajiv K Kalia, Priya Vashishta, Aiichiro Nakano, Xiaolin Zheng
Optical ignition of solid energetic materials, which can rapidly release heat, gas, and thrust, is still challenging due to the limited light absorption and high ignition energy of typical energetic materials ( e.g., aluminum, Al). Here, we demonstrated that the optical ignition and combustion properties of micron-sized Al particles were greatly enhanced by adding only 20 wt % of graphene oxide (GO). These enhancements are attributed to the optically activated disproportionation and oxidation reactions of GO, which release heat to initiate the oxidization of Al by air and generate gaseous products to reduce the agglomeration of the composites and promote the pressure rise during combustion...
October 17, 2018: ACS Nano
https://www.readbyqxmd.com/read/30335359/artificial-bicontinuous-laminate-synergistically-reinforces-and-toughens-dilute-graphene-composites
#17
Senping Liu, Jingran Liu, Zhen Xu, Yilun Liu, Peng Li, Fan Guo, Fang Wang, Yingjun Liu, Mincheng Yang, Weiwei Gao, Chao Gao
Strength and toughness are usually exclusive in polymer nanocomposites with dispersed nanofillers. This intrinsic conflict has been relieved in high filler loading range by mimicking nacre structure of natural selection. However, at the low loading extreme, it still remains a great challenge. Here, we design a bi-continuous laminar (BCL) structure to synergistically reinforce and toughen nanocomposites in the dilute range of nanofiller below 1 wt%. At a typical loading of 0.3 wt%, the BCL composite of graphene oxide (GO) and poly (vinyl alcohol, PVA) has a 8200 % toughness and a comparably reinforced hardness of the dispersed counterpart, accompanying with a 53 folds higher failure elongation that even exceeds that of pure PVA...
October 17, 2018: ACS Nano
https://www.readbyqxmd.com/read/30332775/synthesis-and-application-of-scaffolds-of-chitosan-graphene-oxide-by-the-freeze-drying-method-for-tissue-regeneration
#18
Cesar Valencia, Carlos H Valencia, Fabio Zuluaga, Mayra E Valencia, José H Mina, Carlos David Grande-Tovar
Several biomaterials, including natural polymers, are used to increase cellular interactions as an effective way to treat bone injuries. Chitosan (CS) is one of the most studied biocompatible natural polymers. Graphene oxide (GO) is a carbon-based nanomaterial capable of imparting desired properties to the scaffolds. In the present study, CS and GO were used for scaffold preparation. CS was extracted from the mycelium of the fungus Aspergillus niger . On the other hand, GO was synthesized using an improved Hummers-Offemann method and was characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, atomic force microscopy (AFM), X-ray diffraction (XRD), and dynamic light scattering (DLS)...
October 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/30328041/magnetite-sporopollenin-graphene-oxide-as-new-preconcentration-adsorbent-for-removal-of-polar-organophosphorus-pesticides-in-vegetables
#19
Ayuba Markus, Afeez O Gbadamosi, Adeyinka S Yusuff, Augustine Agi, Jeffrey Oseh
In this study, a new magnetic adsorbent based on magnetite-sporopollenin/graphene oxide (Fe3 O4 -SP/GO) was successfully developed. The adsorbent was applied for magnetic solid phase extraction (MSPE) of three selected polar organophosphorus pesticides (OPPs), namely, dimethoate, phenthoate, and phosphamidon, prior to gas chromatography analysis with electron capture detection (GC-μECD). The Fe3 O4 -SP/GO adsorbent combines the advantages of superior adsorption capability of the modified sporopollenin (SP) with graphene oxide (GO) and magnetite (Fe3 O4 ) for easy isolation from sample solution...
October 16, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30327474/narrow-bandgap-oxide-nanoparticles-coupled-with-graphene-for-high-performance-mid-infrared-photodetection
#20
Xuechao Yu, Yangyang Li, Xiaonan Hu, Daliang Zhang, Ye Tao, Zhixiong Liu, Yongmin He, Md Azimul Haque, Zheng Liu, Tom Wu, Qi Jie Wang
The pursuit of optoelectronic devices operating in the mid-infrared regime is driven by both fundamental interests and envisioned applications ranging from imaging, sensing to communications. Despite continued achievements in traditional semiconductors, notorious obstacles such as the complicated growth processes and cryogenic operation preclude the usage of infrared detectors. As an alternative path towards high-performance photodetectors, hybrid semiconductor/graphene structures have been intensively explored...
October 16, 2018: Nature Communications
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