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https://www.readbyqxmd.com/read/28325036/microwave-hydrothermal-synthesis-of-terbium-ions-complexed-with-porous-graphene-for-effective-absorbent-for-organic-dye
#1
Keqin Chen, Hui Gao, Bowei Bai, Wenjing Liu, Xiaolong Li
A luminescent terbium ions/reduced graphene oxide complex (Tb-RGO) was successfully and rapidly synthesized by the microwave hydrothermal reaction via the interactions between terbium ions and the active oxygen functional groups of graphene oxide. The as-prepared material was porous stacked by multilayer graphene in all directions. Thus, the resulting product owed the high specific surface area, high adsorption capacity and ultra-fast adsorption rate. Combined with the characteristic photoluminescence derived from terbium ions, the material has potential applications in biosensing and environmental protection...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28324956/a-graphene-oxide-ph-sensor-for-wound-monitoring
#2
B Melai, P Salvo, N Calisi, L Moni, A Bonini, C Paoletti, T Lomonaco, V Mollica, R Fuoco, F Di Francesco
This article describes the fabrication and characterization of a pH sensor for monitoring the wound status. The pH sensitive layer consists of a graphene oxide (GO) layer obtained by drop-casting 5 μΐ of GO dispersion onto the working electrode of a screen-printed substrate. Sensitivity was 31.8 mV/pH with an accuracy of 0.3 unit of pH. Open-circuit potentiometry was carried out to measure pH in an exudate sample. The GO pH sensor proved to be reliable as the comparison with results obtained from a standard glass electrode pH-meter showed negligible differences (<; 0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324859/bovine-serum-albumin-as-an-effective-sensitivity-enhancer-for-peptide-based-amperometric-biosensor-for-ultrasensitive-detection-of-prostate-specific-antigen
#3
Zhongxue Tang, Yuanyuan Fu, Zhanfang Ma
Bovine serum albumin (BSA) was firstly implemented as an effective sensitivity enhancer for a peptide-based amperometric biosensor for the ultrasensitive detection of prostate specific antigen (PSA). A porous and conductive substrate of chitosan-lead ferrocyanide-(poly(diallyldimethylammonium chloride)-graphene oxide) was in-situ generated on a glassy carbon electrode (GCE), in which Pb2[Fe(CN)6] served as a novel redox species with strong current signal at -0.46 V (vs. Ag/AgCl). Poly(diallyldimethylammonium chloride)-graphene oxide was applied to improve conductivity of the substrate...
March 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28324727/lithium-vanadate-nanowires-reduced-graphene-oxide-nanocomposites-on-titanium-foil-with-super-high-capacities-for-lithium-ion-batteries
#4
Yunhe Cao, Danyang Chai, Zhiping Luo, Ming Jiang, Weilin Xu, Chuanxi Xiong, Shan Li, Hui Liu, Dong Fang
With a theoretically high capacity and suitable discharge/charge plateaus, lithium vanadates (such as Li0.04V2O5) can be used as cathode material for lithium ion batteries. Herein, Li0.04V2O5 nanowires are densely anchored onto reduced graphene oxide (rGO) nanosheets to form a Li0.04V2O5@rGO nanocomposite by a hydrothermal method with subsequent thermal treatment. Due to this unique structure, the Li0.04V2O5@rGO exhibits remarkable rate performance and excellent cycling stability. Specifically, it delivers a reversible discharge capacity of 738...
March 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28324721/ultradispersed-nanoarchitecture-of-sns-nanoparticles-reduced-graphene-oxide-for-enhanced-sodium-storage-performance
#5
Junming Li, Xingxing Zhao, Zhian Zhang
SnSanodes for Na-ions (NIBs) batteries are known for theirs significantly high theoretical capacities involving conversion reactions and alloying/dealloying mechanisms. However, the large volume expansion of the SnS materials during electrode reactions and the lowelectrical conductivity could cause severe structural degradation and electrodes pulverization, consequently resulting in capacity fading. In this study, Ultradispersed nanoarchitecture of SnS nanoparticles/reduced graphene oxide (SnS/rGO) is prepared by the in situ growing SnS nanoparticles on the graphene followed by the thermal treatment...
March 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28324713/monolithic-cobalt-doped-carbon-aerogel-for-efficient-catalytic-activation-of-peroxymonosulfate-in-water
#6
Peidong Hu, Mingce Long, Xue Bai, Cheng Wang, Caiyun Cai, Jiajun Fu, Baoxue Zhou, Yongfeng Zhou
As an emerging carbonaceous material, carbon aerogels (CAs) display a great potential in environmental cleanup. In this study, a macroscopic three-dimensional monolithic cobalt-doped carbon aerogel was developed by co-condensation of graphene oxide sheets and resorcinol-formaldehyde resin in the presence of cobalt ions, followed by lyophilization, carbonization and thermal treatment in air. Cobalt ions were introduced as a polymerization catalyst to bridge the organogel framework, and finally cobalt species were retained as both metallic cobalt and Co3O4, wrapped by graphitized carbon layers...
March 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28324692/influence-of-graphene-oxide-and-reduced-graphene-oxide-on-the-activity-and-conformation-of-lysozyme
#7
Yitong Bai, Zhu Ming, Yuye Cao, Shicheng Feng, Hua Yang, Lingyun Chen, Sheng-Tao Yang
The dramatically different bio-effects of graphene and graphene oxide (GO) have been widely observed in diverse biological systems, which determine the applications and toxicity of graphene materials. To elucidate the mechanism at molecular level, it is urgent to investigate the enzyme-graphene interaction and its consequences. In this study, we comparatively studied the influence of GO and reduced GO (RGO) on the activity and conformation of lysozyme to provide better understandings of their different bio-effects...
March 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28323404/electrophoretic-approach-for-the-simultaneous-deposition-and-functionalization-of-reduced-graphene-oxide-nanosheets-with-diazonium-compounds-application-for-sensing-in-serum
#8
Qian Wang, Alina Mihaela Vasilescu, Qi Wang, Yannick Coffinier, Musen Li, Rabah Boukherroub, Sabine Szunerits
Electrophoretic deposition (EPD) of reduced graphene oxide nanosheets (rGO) offers several advantages over other surface coating approaches, including process simplicity, uniformity of the deposited films and good control of the film thickness. The EPD conditions might also be of interest for the reduction of diazonium salts, which upon the release of N2 molecules and generation of radicals, can form covalent bonds with the sp2 hybridized carbon lattice atoms of rGO films. In this work, we report on the coating of gold electrodes in one-step with rGO/polyethyleneimine (PEI) thin films and their simultaneous modification using different phenyl (Ph) diazonium salt precursors bearing various functionalities such as -B(OH)2, -COOH and -C≡CH...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28319904/sensitivity-enhancement-of-graphene-zinc-oxide-nanocomposite-based-electrochemical-impedance-genosensor-for-single-stranded-rna-detection
#9
Sze Shin Low, Hwei-San Loh, Jian Sheng Boey, Poi Sim Khiew, Wee Siong Chiu, Michelle T T Tan
An efficient electrochemical impedance genosensing platform has been constructed based on graphene/zinc oxide nanocomposite produced via a facile and green approach. Highly pristine graphene was synthesised from graphite through liquid phase sonication and then mixed with zinc acetate hexahydrate for the synthesis of graphene/zinc oxide nanocomposite by solvothermal growth. The as-synthesised graphene/zinc oxide nanocomposite was characterised with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffractometry (XRD) to evaluate its morphology, crystallinity, composition and purity...
February 27, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28319902/ultra-high-sensitivity-of-the-non-immunological-affinity-of-graphene-oxide-peptide-based-surface-plasmon-resonance-biosensors-to-detect-human-chorionic-gonadotropin
#10
Nan-Fu Chiu, Chia-Tzu Kuo, Ting-Li Lin, Chia-Chen Chang, Chen-Yu Chen
Specific peptide aptamers can be used in place of expensive antibody proteins, and they are gaining increasing importance as sensing probes due to their potential in the development of non-immunological assays with high sensitivity, affinity and specificity for human chorionic gonadotropin (hCG) protein. We combined graphene oxide (GO) sheets with a specific peptide aptamer to create a novel, simple and label-free tool to detect abnormalities at an early stage of pregnancy, a GO-peptide-based surface plasmon resonance (SPR) biosensor...
March 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28319840/grafting-heteroelement-rich-groups-on-graphene-oxide-tuning-polarity-and-molecular-interaction-with-bio-ionic-liquid-for-enhanced-lubrication
#11
Liwen Mu, Yijun Shi, Xiaojing Guo, Wei Zhuang, Long Chen, Tuo Ji, Jing Hua, Huaiyuan Wang, Jiahua Zhu
Two different heteroelement-rich molecules have been successfully grafted on graphene oxide (GO) sheets which were then used as lubricant additives in bio-ionic liquid. The grafting was processed with reactions between GO sheets and synthesized heteroelement-rich molecules (Imidazol-1-yl phosphonic dichloride and 1H-1,2,4-triazol-1-yl phosphonic dichloride, respectively). The modified GO (m-GO) was added into [Choline][Proline] ([CH][P]) bio-ionic liquid, and has been demonstrated effective additive in promoting lubrication...
March 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28319838/graphene-oxide-quantum-dot-sensitized-porous-titanium-dioxide-microsphere-visible-light-driven-photocatalyst-based-on-energy-band-engineering
#12
Yu Zhang, Fuyuan Qi, Ying Li, Xin Zhou, Hongfeng Sun, Wei Zhang, Daliang Liu, Xi-Ming Song
We report a novel graphene oxide quantum dot (GOQD)-sensitized porous TiO2 microsphere for efficient photoelectric conversion. Electro-chemical analysis along with the Mott-Schottky equation reveals conductivity type and energy band structure of the two semiconductors. Based on their energy band structures, visible light-induced electrons can transfer from the p-type GOQD to the n-type TiO2. Enhanced photocurrent and photocatalytic activity in visible light further confirm the enhanced separation of electrons and holes in the nanocomposite...
March 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28319405/heptacene-characterization-in-solution-in-the-solid-state-and-in-films
#13
Ralf Einholz, Treliant Fang, Robert Berger, Peter Grüninger, Andreas Früh, Thomas Chassé, Reinhold F Fink, Holger F Bettinger
Acenes comprise an important class of organic semiconducting materials. As graphene nanoribbons of ultimate width, they are valuable atom-precise model systems for studying the properties of this form of nanoscale carbon materials. Heptacene is the smallest member of the acene series that could only be studied under matrix isolation conditions. Its existence in bulk had never been positively confirmed, despite efforts dating back more than 70 years. We report that the reduction of 7,16-heptacenequinone produces a mixture of two diheptacene molecules...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28319039/tunable-amplified-spontaneous-emission-in-graphene-quantum-dots-doped-cholesteric-liquid-crystals
#14
Mingxuan Cao, Siwei Yang, Yating Zhang, Xiaoxian Song, Yongli Che, Haiting Zhang, Yu Yu, Gu Ding, Guizhong Zhang, Jianquan Yao
Graphene quantum dots (GQDs) have received great attention owing to their unique structure and novel phenomena of optical absorption/emission. In this letter, we observed the tunable amplified spontaneous emission (ASE) in GQDs doped cholesteric liquid crystals (CLC) for the first time. The GQDs are dispersed in CLC homogeneously with the weight ratio of 0.5 wt%. Under optical excitation, a typical ASE is triggered in the system above a 1.25 mJ/cm2 threshold. In addition, the emission peak at the long wavelength edge of the photonic bandgap shifts from 662 nm to 669 nm with the change of working temperature...
March 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28319034/sc-co-sub-2-sub-assisted-process-for-high-energy-density-aerogel-supercapacitor-the-effect-of-go-loading
#15
Maria Sarno, Lucia Baldino, Carmela Scudieri, Stefano Cardea, Paolo Ciambelli, Ernesto Reverchon
Energy density, safety, simple and environmentally friendly preparation methods are very significant aspects in the realization of a compact supercapacitor. Herein we report the use of a supercritical CO2 assisted gel drying process (SC-CO2) for the preparation of porous electrodes containing dispersed graphene in a Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) binder membrane to sandwich in a new portable supercapacitor based on graphene oxide (GO). A GO loading of 60 wt.% has been found to give the better combination of factors (porosity, wettability, mechanical and electrochemical properties,...
March 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28318227/boosting-fiber-shaped-photodetectors-via-soft-interfaces
#16
Zhengfeng Zhu, Dan Ju, Yousheng Zou, Yuhui Dong, Linbao Luo, Tengfei Zhang, Dan Shan, Haibo Zeng
The lightweight, flexible fiber-shaped devices that can be woven into wearable electronic products has caught great attentions in recent years. However the bending and poor interfaces of fiber-shaped devices typically leads to ineluctable performance degradation, which is still a great challenge to be dealt with. Here, taking fiber-shaped photodetector as an example, we proposed an effective strategy, constructing inorganic-organic-graphene hybrid interfaces on a single fiber, to greatly improve the performances of fiber-shaped device...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28318224/defects-mediated-corrosion-in-graphene-coating-layer
#17
Jincheng Lei, Yaowu Hu, Zishun Liu, Gary J Cheng, Kejie Zhao
Mixed results were reported on the anticorrosion of graphene coated metal surfaces - while graphene serves as an effective short-term barrier against corrosion and oxidation due to its low permeability to gases, the galvanic cell between graphene and metal substrate facilitates extensive corrosion in the long run. Defects in the graphene layer provide pathways for the permeation of oxidizing species. We study the role of defects in graphene in the anticorrosion using first-principles theoretical modeling. Experiments in the highly reactive environment indicate that the oxidized products primarily distribute along the grain boundaries of graphene...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28318144/eco-efficient-synthesis-of-highly-porous-coco3-anodes-for-li-and-na-storage-using-supercritical-co2-precursors
#18
Hui-Ying Li, Chuan-Ming Tseng, Cheng-Hsien Yang, Tai-Chou Lee, Ching-Yuan Su, Chien-Te Hsieh, Jeng-Kuei Chang
An eco-efficient synthesis route of high-performance carbonate anodes for Li+ and Na+ batteries is developed. With supercritical CO2 (SCCO2) as the precursor, which has gas-like diffusivity, extremely low viscosity, and near-zero surface tension, CoCO3 particles are uniformly formed and tightly connected on graphene nanosheets (GNSs). This synthesis can be conducted at 50 °C, which is considerably lower than the temperature required for conventional preparation methods, minimizing energy consumption. The obtained CoCO3 particles (~20 nm in diameter), which have a unique interpenetrating porous structure, can increase the number of electroactive sites, promote electrolyte accessibility, shorten ion diffusion length, and readily accommodate the strain generated upon charging/discharging...
March 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28318065/ultra-narrow-low-bandgap-graphene-nanoribbons-from-bromoperylenes-synthesis-and-terahertz-spectroscopy
#19
Daniel Jänsch, Ivan Ivanov, Yulian Zagranyarski, Ivana Duznovic, Martin Baumgarten, Dimitry Turchinovich, Chen Li, Mischa Bonn, Klaus Müllen
Soluble ultra-narrow armchair graphene nanoribbons (AGNRs) with length of ≈20 nm and completely fused cores exceeding 5 nm in length, pronounced near-infrared (NIR) absorption up to 1400 nm, and a low band gap (≈0.9 eV) are synthesized from 3,9(3,10)-dibromoperylene and 3,4,9,10-tetrabromoperylene. Since the monomers are obtained from perylene carboxyanhydrides, a remarkable link between dye and graphene chemistry is established. The two-step protocol for the AGNR synthesis by aryl-aryl coupling and subsequent cyclodehydrogenation is compared with a direct Yamamoto polymerization...
March 20, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28318064/mos2-celgard-separator-as-efficient-polysulfide-barrier-for-long-life-lithium-sulfur-batteries
#20
Zahid Ali Ghazi, Xiao He, Abdul Muqsit Khattak, Niaz Ali Khan, Bin Liang, Azhar Iqbal, Jinxin Wang, Haksong Sin, Lianshan Li, Zhiyong Tang
A high lithium conductive MoS2 /Celgard composite separator is reported as efficient polysulfides barrier in Li-S batteries. Significantly, thanks to the high density of lithium ions on MoS2 surface, this composite separator shows high lithium conductivity, fast lithium diffusion, and facile lithium transference. When used in Li-S batteries, the separator is proven to be highly efficient for depressing polysulfides shuttle, leading to high and long cycle stability. With 65% of sulfur loading, the device with MoS2 /Celgard separator delivers an initial capacity of 808 mAh g(-1) and a substantial capacity of 401 mAh g(-1) after 600 cycles, corresponding to only 0...
March 20, 2017: Advanced Materials
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