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Search for "graphene oxide" in Full Text gives 144 result(s) in Beilstein Journal of Nanotechnology.
A biofunctionalizable ink platform composed of catechol-modified chitosan and reduced graphene oxide/platinum nanocomposite
Beilstein J. Nanotechnol. 2017, 8, 1508–1514, doi:10.3762/bjnano.8.151
- , Szczecin, Poland 10.3762/bjnano.8.151 Abstract We present an ink platform for a printable polymer–graphene nanocomposite that is intended for the development of modular biosensors. The ink consists of catechol-modified chitosan and reduced graphene oxide decorated with platinum nanoparticles (rGO–Pt). We
- . First, we prepare dispersions of reduced graphene oxide (rGO) decorated with platinum nanoparticles (rGO–Pt) in ethylene glycol (EG). As the polymer matrix, we utilize chitosan (CHI), a polycationic biopolymer that provides excellent film-forming properties and easy-to-functionalize amine groups [8
- . While graphene oxide can be readily dispersed in aqueous solutions, graphene and rGO require appropriate organic solvents [11]. N-methyl-2-pyrrolidone (NMP) is perhaps the ideal solvent for the exfoliation of graphite and graphene. However, the aggressive nature of this solvent led us to choose ethylene
Development of a nitrogen-doped 2D material for tribological applications in the boundary-lubrication regime
Beilstein J. Nanotechnol. 2017, 8, 1476–1483, doi:10.3762/bjnano.8.147
- Coating Material Laboratory, NTPC Energy Technology Research Alliance (NETRA), NTPC Ltd, E3, Ecotech II, Greater Noida 201306, Uttar Pradesh, India 10.3762/bjnano.8.147 Abstract The present paper describes a facile synthesis method for nitrogen-doped reduced graphene oxide (N-rGO) and the application of
- nanolubricant in an induced draft (ID) fan results in the remarkable decrease in the power consumption. Keywords: friction; lubrication; nanolubricant; nitrogen-doped reduced graphene oxide; tribology; wear; Introduction Advances in machine technology necessitate the reduction in energy loss by improving the
- carbon nanotubes and graphene oxide nanosheets as additives for water-based lubricants and found that graphene oxide nanosheets improved the tribological properties more than the carbon nanotubes [23]. Zhang et al. studied the tribological properties of an oil lubricant with oleic acid-modified graphene
Fully scalable one-pot method for the production of phosphonic graphene derivatives
Beilstein J. Nanotechnol. 2017, 8, 1094–1103, doi:10.3762/bjnano.8.111
- Kamila Zelechowska Marta Przesniak-Welenc Marcin Lapinski Izabela Kondratowicz Tadeusz Miruszewski Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza St. 11/12; 80-233 Gdansk, Poland 10.3762/bjnano.8.111 Abstract Graphene oxide was functionalized with
- simultaneous reduction to produce phosphonated reduced graphene oxide in a novel, fully scalable, one-pot method. The phosphonic derivative of graphene was obtained through the reaction of graphene oxide with phosphorus trichloride in water. The newly synthesized reduced graphene oxide derivative was fully
- characterized by using spectroscopic methods along with thermal analysis. The morphology of the samples was examined by electron microscopy. The electrical studies revealed that the functionalized graphene derivative behaves in a way similar to chemically or thermally reduced graphene oxide, with an activation
Study of the correlation between sensing performance and surface morphology of inkjet-printed aqueous graphene-based chemiresistors for NO2 detection
Beilstein J. Nanotechnol. 2017, 8, 1023–1031, doi:10.3762/bjnano.8.103
- (graphene oxide) dispersion [14], are reported in literature. The former utilizes a highly energy-consuming method [3][13], the latter generally employs highly dangerous chemicals [4][14]. Therefore both approaches are not suitable for sustainable processes. In this study, the electrical responses of the
CVD transfer-free graphene for sensing applications
Beilstein J. Nanotechnol. 2017, 8, 1015–1022, doi:10.3762/bjnano.8.102
- number of publications dedicated to graphene-based sensors [2]. The gas sensor devices presented in literature are mostly based on pristine graphene, graphene oxide (GO) and reduced graphene oxide (rGO). Many approaches for the fabrication of such materials, including CVD, mechanical, chemical and
Synthesis of graphene–transition metal oxide hybrid nanoparticles and their application in various fields
Beilstein J. Nanotechnol. 2017, 8, 688–714, doi:10.3762/bjnano.8.74
- structures are particularly interesting because after hybridisation they not only display the individual properties of graphene and the NPs, but also they exhibit further synergistic properties. Reduced graphene oxide (rGO), a graphene-like material, can be easily prepared by reduction of graphene oxide (GO
- perspectives to improve the properties of the hybrid materials in view of applications are outlined. Keywords: graphene; hybrid; nanoparticle; reduced graphene oxide; transition metal oxide; Review Introduction Graphene consists of a single layer of carbon in a two-dimensional (2D) lattice. It is a densely
- ] (Figure 6). N-doping of reduced mildly oxidised graphene oxide (rmGO) affords stronger coupling than rmGO and Co3O4 (Co3O4/N-rmGO than in Co3O4/rmGO) due to favourable nucleation and anchor sites for Co3O4 nanocrystals as N-groups help on rGO. In the ORR, the electronic effect of N-doping of graphene also
Nanostructured carbon materials decorated with organophosphorus moieties: synthesis and application
Beilstein J. Nanotechnol. 2017, 8, 485–493, doi:10.3762/bjnano.8.52
- palladium nanoparticles supported on phosphine decorated graphene oxide [17]. The interest in the introduction of a phosphine oxide group in CNMs is due to its ability to promote a wide varieties of chemical transformation [18]. Phosphines have found large application in organocatalytic processes [19][20
Graphene–polymer coating for the realization of strain sensors
Beilstein J. Nanotechnol. 2017, 8, 21–27, doi:10.3762/bjnano.8.3
- strain gauge. These compounds have received significant interest not only for their high sensibility and tunability, but also for the potential for gauging strain that they offer in several biological systems. A highly stretchable and sensitive strain sensor based on reduced graphene oxide or graphene on
Facile fabrication of luminescent organic dots by thermolysis of citric acid in urea melt, and their use for cell staining and polyelectrolyte microcapsule labelling
Beilstein J. Nanotechnol. 2016, 7, 1905–1917, doi:10.3762/bjnano.7.182
- nitric acid oxidation of carbon soot reduced the viability of HepG2 cells by 20%, at concentrations higher than 100 μg/mL [49]. The graphene quantum dots prepared with graphene oxide as starting material were markedly toxic for MCF-7 and MGC-803 (human gastric cancer) cells at concentrations higher than
Evolution of the graphite surface in phosphoric acid: an AFM and Raman study
Beilstein J. Nanotechnol. 2016, 7, 1878–1884, doi:10.3762/bjnano.7.180
- is grown there with respect to the darker A-regions. Considering that (1) the EC process induces an oxidation of the graphite surface (anodic currents), (2) the refractive index of graphene oxide is about 1.85 [14][15] and that (3) the light used to acquire the image reported in Figure 2 is in the
In situ formation of reduced graphene oxide structures in ceria by combined sol–gel and solvothermal processing
Beilstein J. Nanotechnol. 2016, 7, 1815–1821, doi:10.3762/bjnano.7.174
- Shanghai, P. R. China Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, 1060 Wien, Austria 10.3762/bjnano.7.174 Abstract Raman and IR investigations indicated the presence of reduced graphene oxide (rGO)-like residues on ceria nanoparticles after
- solvothermal treatment in ethanol. The appearance of such structures is closely related to cerium tert-butoxide as precursor and ethanol as solvothermal solvent. The rGO-like residues improve the catalytic CO oxidation activity. This was also confirmed by introduction of “external” graphene oxide during sol
- –gel processing, by which the rGO structures and the catalytic activity were enhanced. Keywords: ceria; CO oxidation; graphene oxide; sol–gel processing; Introduction Ceria (CeO2) has been widely studied as catalyst or catalyst support for redox reactions owing to its high oxygen storage and release
Monolayer graphene/SiC Schottky barrier diodes with improved barrier height uniformity as a sensing platform for the detection of heavy metals
Beilstein J. Nanotechnol. 2016, 7, 1800–1814, doi:10.3762/bjnano.7.173
- electronic properties to a change in concentrations of surface functional groups and adsorbates. However, sensors based on reduced graphene oxide are only well investigated in terms of determination of the concentration limit of heavy metals and improving the response time [18][19][20][21][22][23][24][25][26
- ]. In particular, it was previously reported that functionalized graphene oxide sheets on Au templates can effectively detect lead and mercury ions with improved electrochemical performance [18]. The possibility of using field effect transistors (FET) based on thermally reduced graphene oxide decorated
- to literature, graphene oxide is more toxic than pristine graphene [27], has a lower carrier mobility [28], higher thermal noise and a natural tendency to agglomerate [29]. In addition, because of the high material inhomogeneity and small domain sizes, it is complicated to fabricate sensing devices
Role of RGO support and irradiation source on the photocatalytic activity of CdS–ZnO semiconductor nanostructures
Beilstein J. Nanotechnol. 2016, 7, 1684–1697, doi:10.3762/bjnano.7.161
- the photocatalysts. In this work, we have investigated the role of reduced graphene oxide (RGO) support and the irradiation source on mixed metal chalcogenide semiconductor (CdS–ZnO) nanostructures. The photocatalyst material was synthesized using a facile hydrothermal method and thoroughly
- the conduction band (CB) of CdS to that of ZnO [22][27]. The CdS–ZnO semiconductor nanostructures can be further supported on graphene/reduced graphene oxide (RGO) materials to improve their photocatalytic properties. Ideally, graphene is a single layer carbon sheet, which consists of a two
- purchased from Sigma-Aldrich. All chemicals were used as received without further purification. Deionized water (18.2 MΩ·cm) used in synthesis was obtained from a double-stage water purifier (ELGA PURELAB Option-R7). Synthesis of graphene oxide Graphene oxide (GO) was synthesized from natural graphite
Graphene-enhanced plasmonic nanohole arrays for environmental sensing in aqueous samples
Beilstein J. Nanotechnol. 2016, 7, 1564–1573, doi:10.3762/bjnano.7.150
- the nanohole array surface. Furthermore, a reduced graphene oxide (rGO) sensor surface was layered over the nanohole array. Reduced graphene oxide is a 2D nanomaterial consisting of sp2-hybridized carbon atoms and is an attractive receptor surface for SPR as it omits any bulk phase and therefore
- , distance between the centres of neighbouring holes) both significantly affect the plasmonic properties and therefore the sensitivity of nanohole arrays [34]. For an analytical application the gold layer needs to be modified with a receptor layer. Reduced graphene oxide (rGO) is a very interesting receptor
- the fabrication of the plasmon–graphene hybrids, the nanostructured substrates were functionalized with rGO via spin coating. The resulting two-dimensional graphene nanomaterial was characterized using Raman microscopy (Figure 5). Reduced graphene oxide is identified by the three distinct Raman bands
Development of adsorptive membranes by confinement of activated biochar into electrospun nanofibers
Beilstein J. Nanotechnol. 2016, 7, 1556–1563, doi:10.3762/bjnano.7.149
- our previous research, we observed that the adsorption capacity of activated pinewood biochar towards CTC was up to 434 mg/g, which is comparable with graphene oxide and carbon nanotubes [22]. However, in this research, due to the low loading of activated biochar onto membrane, the adsorption capacity
A composite structure based on reduced graphene oxide and metal oxide nanomaterials for chemical sensors
Beilstein J. Nanotechnol. 2016, 7, 1421–1427, doi:10.3762/bjnano.7.133
- , Via Valotti 9, 25133 Brescia, Italy Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA 10.3762/bjnano.7.133 Abstract A hybrid nanostructure based on reduced graphene oxide and ZnO has been obtained for the detection of volatile organic compounds. The
- monitoring of environmental pollutants and for the application of breath tests in assessment of exposure to volatile organic compounds. Keywords: chemical sensors; reduced graphene oxide (RGO); volatile organic compounds; zinc oxide (ZnO); Introduction Hazard analysis of critical control point (HACCP
- materials make them a suitable candidate for various applications [20][21]. Recently we have shown that the functionalization of ZnO with reduced graphene oxide (RGO) sheets improved its sensing performance for NO2 and H2 [22]. Abideen et al. also improved the response of ZnO towards H2 preparing ZnO
Mesoporous hollow carbon spheres for lithium–sulfur batteries: distribution of sulfur and electrochemical performance
Beilstein J. Nanotechnol. 2016, 7, 1229–1240, doi:10.3762/bjnano.7.114
- been carried out on nanostructured carbon hosts for sulfur storage including carbon fibers [13][14], carbon nanotubes [15][16], graphene/graphene oxide [17][18][19] as well as micro-/mesoporous carbons [20][21][22]. Among the porous carbons, especially hollow carbon spheres (HCS) have attracted
Reasons and remedies for the agglomeration of multilayered graphene and carbon nanotubes in polymers
Beilstein J. Nanotechnol. 2016, 7, 1174–1196, doi:10.3762/bjnano.7.109
- can be attributed to the higher capability of graphene to rebound advancing cracks [11][12]. The Raman and XPS spectra of graphite, graphene oxide (GO), and thermally reduced graphene oxide (RGO) are shown in Figure 1a,b. The graphene structure can be studied by using transmission electron microscopy
- was achieved for amino-functionalized graphene oxide (APTS-GO) [90], while the largest improvement was recorded for surfactant-modified graphene nanoplatelets [60]. SWNTs in superacids: Strong acids such as fuming sulfuric acid and clorosulfonic acid can dissolve and disperse MLG and CNTs in large
- of nanocomposites. Naebe et al. produced covalently functionalized MLG–epoxy nanocomposites and reported 18% and 23% increase in flexural strength and modulus, respectively [147]. Qi et al. produced graphene oxide–epoxy nanocomposites and reported increase up to 53% in flexural strength [148]. The
Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode
Beilstein J. Nanotechnol. 2016, 7, 1104–1112, doi:10.3762/bjnano.7.103
- optimal test conditions of GA were carefully investigated on a sensor based on chitosan/fFe2O3/reduced graphene oxide/GCE. Under optimal conditions, the detection limit was estimated to be 1.5 × 10−7 M [4]. An electrochemical sensor coupled with an effective flow-injection amperometric system was
- with thionine and nickel hexacyanoferrate [13]. A polyethyleneimine-functionalized graphene oxide modified glassy carbon electrode sensor was developed for sensitive detection of gallic acid [14]. A polyepinephrine modified glassy carbon electrode electrochemical sensor was developed for adsorptive
Development of highly faceted reduced graphene oxide-coated copper oxide and copper nanoparticles on a copper foil surface
Beilstein J. Nanotechnol. 2016, 7, 1010–1017, doi:10.3762/bjnano.7.93
- Nanotechnology Program. Centro de Investigación y de Estudios Avanzados del IPN. Av. IPN 2508, Col. San Pedro Zacatenco, Mexico City 07360, Mexico 10.3762/bjnano.7.93 Abstract This work describes the formation of reduced graphene oxide-coated copper oxide and copper nanoparticles (rGO-Cu2ONPs, rGO-CuNPs) on the
- surface of a copper foil supporting graphene oxide (GO) at annealing temperatures of 200–1000 °C, under an Ar atmosphere. These hybrid nanostructures were developed from bare copper oxide nanoparticles which grew at an annealing temperature of 80 °C under nitrogen flux. The predominant phase as well as
- ; copper(II) oxide; core–shell; reduced graphene oxide; Introduction In the last years, graphene oxide (GO) and reduced graphene oxide (rGO) have emerged as suitable candidates to prepare graphene-based nanocomposites [1][2], including those based on GO/inorganic nanoparticles [3]. The opportunity to
Facile synthesis of water-soluble carbon nano-onions under alkaline conditions
Beilstein J. Nanotechnol. 2016, 7, 758–766, doi:10.3762/bjnano.7.67
- carbonizing the samples in the presence of NaOH 30%. The color is probably due to the partial oxidation of graphene to graphene oxide during the process [35]. The water-soluble part of the residue was extracted by dissolution in 100 mL deionized water, then filtrated through normal filter papers and followed
Tight junction between endothelial cells: the interaction between nanoparticles and blood vessels
Beilstein J. Nanotechnol. 2016, 7, 675–684, doi:10.3762/bjnano.7.60
- mainly in rat livers after a single intravenous administration [34]. Subsequent histopathological changes were also found in liver, spleen and kidney after the intravenous administration with dextran-coated graphene oxide nanoplatelets at a dose of 250 mg/kg and more [35]. Effects of NPs on blood vessels
Synthesis and applications of carbon nanomaterials for energy generation and storage
Beilstein J. Nanotechnol. 2016, 7, 149–196, doi:10.3762/bjnano.7.17
- graphene oxide CVD Synthesis on SiC Each of these methods has its advantages and disadvantages in terms of quality, yield production and applications, as summarized in Table 1. In particular, mechanical exfoliation most likely produces the best samples in terms of charge carrier mobility but is probably
- based on the chemical exfoliation of graphite and thermal or chemical reduction of graphene oxide can produce graphene on an industrial scale but unfortunately with structural defects that can affect the electronic and electrical properties [84][85]. These are the main problems that impede the
- thermal reduction of graphene oxide. Graphene oxide (GO) is a semiconducting material originating from graphene research and can be considered a precursor of the graphene synthesis by chemical or thermal reduction [84][85][98][99]. It has recently attracted significant interest because of its potential as
Controlled graphene oxide assembly on silver nanocube monolayers for SERS detection: dependence on nanocube packing procedure
Beilstein J. Nanotechnol. 2016, 7, 9–21, doi:10.3762/bjnano.7.2
- Sesto Fiorentino, Italy Department of Chemistry and CSGI, University of Florence, Via della Lastruccia 3–13, I-50019 Sesto Fiorentino, Italy 10.3762/bjnano.7.2 Abstract Hybrid graphene oxide/silver nanocubes (GO/AgNCs) arrays for surface-enhanced Raman spectroscopy (SERS) applications were prepared by
- means of two procedures differing for the method used in the assembly of the silver nanocubes onto the surface: Langmuir–Blodgett (LB) transfer and direct sequential physisorption of silver nanocubes (AgNCs). Adsorption of graphene oxide (GO) flakes on the AgNC assemblies obtained with both procedures
- analysis. Keywords: graphene oxide; quartz crystal microbalance; sensing application; SERS; silver nanocubes; Introduction Organized films composed of metal nanoparticles have been extensively studied in recent years owing to their enormous potential in fields as diverse as photoelectrochemistry [1][2
Green and energy-efficient methods for the production of metallic nanoparticles
Beilstein J. Nanotechnol. 2015, 6, 2354–2376, doi:10.3762/bjnano.6.243
- . They reacted AgNO3 and graphene oxide (GO) with TA simultaneously and observed that GO sheets were impregnated with many Ag NPs with diameters up to 20 nm [73]. Kasthuri et al. synthesized anisotropic Au and quasi-spherical Ag NPs using apiin to reduce AgNO3 and HAuCl4 at room temperature within 60 s
- -isoprene moieties help stabilization of NPs [8]. Li et al. produced bimetallic Pd–Ag NPs from AgNO3, K2PdCl4 using graphene oxide (GO) nanosheets as reducing agent, support and stabilizer. The synthesis process took place at 84 °C for 3 h for reduction of metallic ions and 200 °C for 24 h for reduction of
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