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Graphene

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https://www.readbyqxmd.com/read/28526342/ph-controlled-drug-delivery-with-hybrid-aerogel-of-chitosan-carboxymethyl-cellulose-and-graphene-oxide-as-the-carrier
#1
Ren Wang, Dan Shou, Ouyang Lv, Yong Kong, Linhong Deng, Jian Shen
Hybrid aerogels of chitosan (CS), carboxymethyl cellulose (CMC) and graphene oxide (GO) are successfully prepared by using calcium ion (Ca(2+)) as the crosslinker. The resultant hybrid aerogels, CS/CMC/Ca(2+)/GO, are characterized by field emission scanning electron microscopy (FESEM) and Fourier transform infrared (FT-IR) spectroscopy. Due to the pH sensitivity of CS and CMC, pH-controlled drug delivery with CS/CMC/Ca(2+)/GO as the carrier is investigated using 5-fluorouracil (5-FU), an effective chemotherapeutic agent in the treatment of cancers, as the model drug...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28525951/perfect-spin-filter-in-a-tailored-zigzag-graphene-nanoribbon
#2
Dawei Kang, Bowen Wang, Caijuan Xia, Haisheng Li
Zigzag graphene nanoribbons (ZGNRs) are expected to serve as the promising component in the all-carbon spintronic device. It remains challenging to fabricate a device based on ZGNRs with high spin-filter efficiency and low experimental complexity. Using density functional theory combined with nonequilibrium Green's function technique, we studied the spin-dependent transport properties of the tailored zigzag graphene nanoribbon. A perfect spin-filtering effect is found in the tailored structure of ZGNR. The nearly 100% spin-polarized current and high magneto-resistance ratio can be obtained by applying a homogeneous magnetic field across the device...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28525850/highly-sensitive-aptasensor-based-on-fluorescence-resonance-energy-transfer-between-l-cysteine-capped-zns-quantum-dots-and-graphene-oxide-sheets-for-the-determination-of-edifenphos-fungicide
#3
Majid Arvand, Aazam A Mirroshandel
With the advantages of excellent optical properties and biocompatibility, single-strand DNA-functionalized quantum dots have been widely applied in biosensing and bioimaging. A new aptasensor with easy operation, high sensitivity, and high selectivity was developed by immobilizing the aptamer on water soluble l-cysteine capped ZnS quantum dots (QDs). Graphene oxide (GO) sheets are mixed with the aptamer-QDs. Consequently, the aptamer-conjugated QDs bind to the GO sheets to form a GO/aptamer-QDs ensemble. This aptasensor enables the energy transfer based on a fluorescence resonance energy transfer (FRET) from the QDs to the GO sheets, quenching the fluorescence of QDs...
May 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28525720/experimental-and-theoretical-investigations-of-surface-assisted-graphene-nanoribbon-synthesis-featuring-carbon-fluorine-bond-cleavage
#4
Hironobu Hayashi, Junichi Yamaguchi, Hideyuki Jippo, Ryunosuke Hayashi, Naoki Aratani, Mari Ohfuchi, Shintaro Sato, Hiroko Yamada
Edge-fluorinated graphene nanoribbons are predicted to exhibit attractive structural and electronic properties, which, however, still need to be demonstrated experimentally. Hence, to provide further experimental insights, an anthracene trimer comprising a partially fluorinated central unit is explored as a precursor molecule, with scanning tunneling microscopy and X-ray photoelectron spectroscopy analyses indicating the formation of partially edge-fluorinated polyanthrylenes via on-surface reactions after annealing at 350 °C on Au(111) under ultrahigh vacuum conditions...
May 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28525396/gold-nanoparticle-mediated-graphene-plasmon-for-broadband-enhanced-infrared-spectroscopy
#5
Lilan Peng, Lei Zhang, Jian Yuan, Chen Chen, Qiaoliang Bao, Chengwei Qiu, Kai Zhang, Zeping Peng
Graphene plasmonics, with dynamic tunable resonance wavelength, has been successfully used in broadband plasmon-enhanced infrared spectroscopy. However, the requirement for external voltage loading makes the practical application sophisticated. In this work, the hybrid structure of graphene nanodot array (GNA) and gold nanoparticles (AuNPs) has been proposed as a passive platform for broadband infrared absorption enhancement. Numerical simulations show that the plasmon resonance peak of GNA becomes stiffer and broader when introducing AuNPs, and this is also proved by experimental results that the vibrational modes of PEO molecule in a broad spectral range can be simultaneously enhanced...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28525278/role-of-edge-engineering-in-photoconductiviy-of-graphene-nano-ribbons
#6
Ivan Ivanov, Yunbin Hu, Silvio Osella, Uliana Beser, Hai I Wang, David Beljonne, Akimitsu Narita, Klaus Müllen, Dmitry Turchinovich, Mischa Bonn
The effect of edge engineering of graphene nanoribbons (GNRs) on their ultrafast photoconductivity is investigated. Three different GNRs were fabricated by bottom-up synthesis in the liquid phase, where structure, width, and edge planarity could be controlled chemically at the atomic level. The charge carrier transport in the fabricated GNRs was studied on the ultrafast, sub-picosecond time-scale using time-resolved terahertz (THz) spectroscopy, giving access to the elementary parameters of carrier conduction...
May 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28525274/metal-nanoparticle-catalyzed-hydrogen-generation-from-formic-acid
#7
Zhangpeng Li, Qiang Xu
To meet the ever-increasing energy demand, the development of effective, renewable, and environmentally friendly sources of alternative energy is imperative. Hydrogen (H2) is a renewable, clean energy carrier, which exhibits a threefold energy density compared to gasoline; H2 is considered one of the most promising alternative energy carriers for enabling a secure, clean energy future. However, the realization of a hydrogen economy is restricted by several unresolved issues. Particularly, one of the most difficult challenges is the development of a safe, efficient hydrogen storage and delivery system...
May 19, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28524923/vertical-1t-mos2-nanosheets-with-expanded-interlayer-spacing-edged-on-a-graphene-frame-for-high-rate-lithium-ion-batteries
#8
Ting Xiang, Qi Fang, Hui Xie, Chuanqiang Wu, Changda Wang, Yu Zhou, Daobin Liu, Shuangming Chen, Adnan Khalil, Shi Tao, Qin Liu, Li Song
Vertical 1T-MoS2 nanosheets with an expanded interlayer spacing of 9.8 Å were successfully grown on a graphene surface via a one-step solvothermal method. Such unique hybridized structures provided strong electrical and chemical coupling between the vertical nanosheets and graphene layers by means of C-O-Mo bonding. The merits are very beneficial for a high-efficiency electron/ion transport pathway and structural stability. As a proof of concept, the lithium ion battery with the as-obtained hybrid's electrode exhibited excellent rate performance with a 666 mA h g(-1) capacity at a high current density of 3500 mA g(-1)...
May 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28524920/towards-stoichiometric-analogues-of-graphene-graphane-fluorographene-graphol-graphene-acid-and-others
#9
REVIEW
Martin Pumera, Zdeněk Sofer
Stoichiometric derivatives of graphene, having well-defined chemical structure and well-defined chemical bonds, are of a great interest to the 2D materials research. Hydrogenated graphene (graphene), fluorographene, hydroxygraphene (graphol), thiographene, cyanographene, aminographene, graphene acid pose unique and well defined chemical and physical properties, allowing their further transformation and application in the devices. Here we overview various methods of their synthesis and discuss their chemistry and properties...
May 19, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28524685/strong-modulation-of-spin-currents-in-bilayer-graphene-by-static-and-fluctuating-proximity-exchange-fields
#10
Simranjeet Singh, Jyoti Katoch, Tiancong Zhu, Keng-Yuan Meng, Tianyu Liu, Jack T Brangham, Fengyuan Yang, Michael E Flatté, Roland K Kawakami
Two-dimensional materials provide a unique platform to explore the full potential of magnetic proximity-driven phenomena, which can be further used for applications in next-generation spintronic devices. Of particular interest is to understand and control spin currents in graphene by the magnetic exchange field of a nearby ferromagnetic material in graphene-ferromagnetic-insulator (FMI) heterostructures. Here, we present the experimental study showing the strong modulation of spin currents in graphene layers by controlling the direction of the exchange field due to FMI magnetization...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524252/in-vivo-noninvasive-analysis-of-graphene-nanomaterial-pharmacokinetics-using-photoacoustic-flow-cytometry
#11
Dmitry A Nedosekin, Jacqueline Nolan, Chengzhong Cai, Shawn E Bourdo, Zeid Nima, Alexandru S Biris, Vladimir P Zharov
Graphene-based nanomaterials (GBNs) are quickly revolutionizing modern electronics, energy generation and storage, clothing and biomedical devices. Due to GBN's variety of physical and chemical parameters that define their toxicity and their aggregation in suspension, interpreting its toxicology without accurate information on graphene's distribution and behavior in live organisms is challenging. In this work, we present a laser-based optical detection methodology for noninvasive detection and pharmacokinetics analysis of GBNs directly in blood flow in mice using in vivo photoacoustic (PA) flow cytometry (PAFC)...
May 19, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28524105/structural-analysis-of-polymer-composites-using-spectral-domain-optical-coherence-tomography
#12
Muhammad Faizan Shirazi, Mansik Jeon, Jeehyun Kim
The structural analysis of nylon/graphene oxide (NY/GO) and polyetherblockamide/ trisilinolphenyl-polyhederal oligomeric silsesquioxane (PEBA/t-POSS) composites were performed using high-resolution spectral domain optical coherence tomography (SD-OCT). This optical technology revealed both cross-sectional, as well as sub-layer depth information of sample. The non-destructive real-time imaging demonstrated the nature of defects in the composites. The thickness and location of each defect point in the composites were measured using A-scan analysis on the SD-OCT images...
May 18, 2017: Sensors
https://www.readbyqxmd.com/read/28523861/a-bifunctional-hybrid-electrocatalyst-for-oxygen-reduction-and-evolution-cobalt-oxide-nanoparticles-strongly-coupled-to-b-n-decorated-graphene
#13
Yun Tong, Pengzuo Chen, Tianpei Zhou, Kun Xu, Wangsheng Chu, Changzheng Wu, Yi Xie
The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal-air batteries. Rational design of highly efficient non-noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large-scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoOx nanoparticles rich in oxygen vacancies grown on B,N-decorated graphene (CoOx NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28523755/asymmetric-supercapacitors-based-on-rgo-pmo12-as-a-positive-and-rgo-pw12-as-a-negative-electrode
#14
Deepak Dubal, Nilesh Chodankar, Ajayan Vinu, Do-Heyoung Kim, Pedro Gomez-Romero
Nanofabrication via "bottom-up" approach of hybrid electrode materials into well-defined architecture is essential for the next generation miniaturized energy storage devices. This paper describes the design and fabrication of reduced graphene oxide (rGO)/polyoxometalates (POMs) based hybrid electrode materials and their successful exploitation for asymmetric supercapacitor. Firstly, the redox active nanoclusters of POMs (phosphomolybdic acid (PMo12) and phosphotungstic acid (PW12)) are uniformly decorated on the surface of rGO nanosheets to take full advantage of both charge-storing mechanisms (faradaic from POMs and electric double layer from rGO)...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28523270/aortic-graft-infection-graphene-shows-the-way-to-an-infection-resistant-vascular-graft
#15
Nikolaos Patelis, Dimitrios Schizas, Theodoros Liakakos, Chris Klonaris
Aortic graft infection is a potentially lethal complication of open and endovascular repair of aortic aneurysms. Graphene is the only existing two-dimensional material, and its unique structure gives graphene and its derivatives a plethora of original characteristics. Among other characteristics, graphene demonstrates bacteriostatic and bactericidal effects that could potentially resolve the problem of graft infection in the future. Data already exist in literature supporting this antibacterial effect of graphene oxide and reduced graphene oxide...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/28522809/nickel-cobalt-sulfide-core-shell-structure-on-3d-graphene-for-supercapacitor-application
#16
Lemu Girma Beka, Xin Li, Weihua Liu
Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3-x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522530/high-harmonic-generation-in-graphene-enhanced-by-elliptically-polarized-light-excitation
#17
Naotaka Yoshikawa, Tomohiro Tamaya, Koichiro Tanaka
The electronic properties of graphene can give rise to a range of nonlinear optical responses. One of the most desirable nonlinear optical processes is high-harmonic generation (HHG) originating from coherent electron motion induced by an intense light field. Here, we report on the observation of up to ninth-order harmonics in graphene excited by mid-infrared laser pulses at room temperature. The HHG in graphene is enhanced by an elliptically polarized laser excitation, and the resultant harmonic radiation has a particular polarization...
May 19, 2017: Science
https://www.readbyqxmd.com/read/28522514/graphene-takes-light-to-a-higher-level
#18
EDITORIAL
Ian S Osborne
No abstract text is available yet for this article.
May 19, 2017: Science
https://www.readbyqxmd.com/read/28522308/development-of-a-ssdna-aptamer-for-detection-of-residual-benzylpenicillin
#19
A-Young Lee, Na-Reum Ha, In-Pil Jung, Sang-Heon Kim, A-Ru Kim, Moon-Young Yoon
Antibiotics are useful for improving the living conditions of livestock. However, residual antibiotics induce several human diseases such as food-borne illness and infection of carbapenem-resistant Enterobacteriaceae (CRE). In this study, the identification of a benzylpenicillin-specific aptamer was selected by rGO-SELEX (reduced Graphene Oxide-Systematic Evolution of Ligands by EXponential enrichment). A random ssDNA library was incubated with rGO for adsorption and eluted with benzylpenicillin. As a result of the selection process, a DNA aptamer was found that specifically bound to benzylpenicillin with high binding affinity, Kd = 383...
May 15, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28521282/the-possibility-of-using-c20-fullerene-and-graphene-as-semiconductor-segments-for-detection-and-destruction-of-cyanogen-chloride-chemical-agent
#20
Parvaneh Pakravan, Seyyed Amir Siadati
Detection of hazardous chemical species by changing the electrical conductivity of a semiconductor matter is a proposed and applied way for decreasing their subsequent unpleasant effects. Recently, many examples of using inorganic or organic materials, polymeric, and also nano-sized species as sensors were reported in which, in some cases, those matters were strongly affective and suitable. In this project, we have made an assessment on whether the graphene segment or C20 fullerene, able to sense the existence of cyanogen chloride NCCl? In order to gain trustable results, the possible reaction pathways along with the adsorption kinetics were investigated...
April 27, 2017: Journal of Molecular Graphics & Modelling
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