fast diffusion of graphene flake and commensurate incommensurate phase transition

... results on STM and HREELS studies of two dimensional graphene films and graphene nanoislands In Chapter and 4, we investigate the k-space dependent plasmons behaviors of epitaxial graphene with ... semimetallic graphene band structure Figure 1.4 Calculated E(k) of zigzag ribbons [N = (a), N = (b), and N = (c)], calculated band structure of a zigzag ribbon (d), and the projected band structure of ... sublattices) (c) The band structure of graphene (only π-band) The energy is given in units of t Zoom in the energy bands close to one of the Dirac points shown in the right panel For (b and c), reproduced...

Ngày tải lên: 10/09/2015, 15:49

... Nasti, F Ricciardella, S Romano and G Di Francia Study of Interaction Between Graphene Layers: Fast Diffusion of Graphene Flake and Commensurate- Incommensurate Phase Transition ... evaluation of the Dirac energy position and the size of the band gap Concurrent with the band structure shift, the size of the band-gap increases The band fitting retrieves the energy of the bottom of ... case of graphene systems We present a phase diagram where the infrared activity of both the symmetric (E g ) and antisymmetric (E u ) phonon modes is evaluated as a function of doping and gap, and...

Ngày tải lên: 24/03/2014, 01:20

... Refractive Indices and Densities of Mixtures of Certain Alcohols and Aldehydes,” J Am Chem Soc., 50, pp 499-503 Adkins, H and Broderick, A.E (1928b) “The Rate of Synthesis and Hydrolysis of Certain Acetals,” ... concentrations of the alcohol and the acid, an equilibrium constant of corresponds to a conversion of 59 mol % of the reactants; an equilibrium constant of corresponds to a conversion of 67 mol % ... times faster than for methyl alcohol and benzoic acid; and 173 times faster than for benzyl alcohol and benzoic acid This reflects the slower reaction rate of the larger molecules (Hinshelwood and...

Ngày tải lên: 19/06/2014, 14:02

... structure and lowest surface resistance Puzzling results for functionalized graphene sheet nanocomposites suggest that phonon coupling of the vibrational modes of the graphene and of the polymeric ... cross-link density and hence, on the final properties of the system Thus, we aimed at studying the effect of two types of carbon-based nanofillers, in particular, nanotubes and graphene sheets, ... properties, the recent developments on graphene synthesis routes and on -2- the understanding of their unique properties have prompted the development and study of graphene filled nanocomposites [12,...

Ngày tải lên: 20/06/2014, 23:20

... sheet of a graphene A good distribution of Au nanoparticles in the matrix phase of graphene has been delineated in the graphene- Au composite materials with a good interface between the matrix and ... Ag /graphene nanocomposites where the effect was attributed to electron transfer from Ag to graphene due to smaller wave function of Ag than graphene [26,27] Interaction between Au and C=O of graphene ... the microstructure of graphene as well as the size, shape, and distribution of Au nanoparticles in the graphene matrix (Figure 4) A conventional folded microstructure of thin graphene sheets was...

Ngày tải lên: 21/06/2014, 03:20

... numerically Conclusions In this paper, we have determined the energy band structure of graphene nanoribbons and conductance of nanoribbons and graphene metal/semiconductor junctions using a NEGF formalism ... considered, the conductance of the conduction and valence bands is always symmetrical as determined by the formulation of the energy dispersion relation, equation In the case of graphene nanoribbons, ... significant discrepancies occur at higher energies Conductance of Graphene Nanoribbons and Junctions Conductance in graphene nanoribbons and metal/semiconductor junctions is determined using an efficient...

Ngày tải lên: 21/06/2014, 11:20

... 10 s a and b 25 s of exposure to microwave; and c ZnO nanopowder in grams quantity Fig a–d Low and high magnification FESEM images of ZnO nanowires Figure 5a illustrates the morphology of a nanowire ... onto the ZnO surface and current decreased to the initial value The decrease of current or recovery is controlled by diffusion and desorption of hydrogen on the surface of nanowires Thus, the ... the surface is reduced and so is the width of the depletion region, the energy band bending, and the corresponding energy barrier Consequently, the conduction of the regions of the nanowires near...

Ngày tải lên: 22/06/2014, 00:20

... change of the behavior of the general lower profile as a function of time It shows the importance of the critical time tc For the sake of simplicity, we consider tc = Proof We skip the proof of this ... (5.5) and the time interval < t < T becomes < τ < ∞ In a celebrated paper, Berryman and Holland [13] reduced the study of the behavior near T of the solutions of problem (5.1) to the study of the ... the positivity of solutions of the FDE, both in the case of the Cauchy problem posed in the whole Rd space and in the case of the mixed Cauchy-Dirichlet problem posed in a domain of Rd In both...

Ngày tải lên: 22/06/2014, 22:20

... statistical analysis of the correlation metric c is required The correlation metric c of (7) is a sum of a large number of independent random variables The terms of the sum are products of (watermarked ... the University of Pittsburgh, Pittsburgh, Pa, where he served as Assistant Professor (1970–1976) and Associate Professor (1976–1980) Since 1980, he has been Professor of electrical and computer ... watermark detection scheme is shown to withstand transcoding (bitrate change and/ or coding standard change), as well as cropping and filtering It is also very fast and therefore suitable for applications...

Ngày tải lên: 23/06/2014, 01:20

... result of more than purely a cessation of growth Our current studies suggest that globulus leaf initiation is important and, as demonstrated in Fig 3, the initiation of new leaves at the apex of ... understanding of the control of new leaf formation is limited at present and further research is being directed in this area References Borralho N., Araujo M.C & Pereira J.S (1987j Influence of water ... J.S (1987j Influence of water supply in crown structure and production of three clones of E globulus in the juvenile phase In: Structural and Functional Responses to Environmentat Stresses: Water...

Ngày tải lên: 09/08/2014, 04:20

... supply and demand, adopted interventions of the waiting-list project, and standardised process steps [16] Meso level: leadership programme and internal programme organisation Instead of a single-level ... strategy and mission, broadbased support and advocacy (from both top and middle management), attention to human resources (training and support), and meticulous monitoring of the impact of the ... part of the hospital policy (Programme coordinator, hospital 3) In practice, internal dissemination is a combination of own initiative and obligation, of ‘bottom up’ and ‘top down’, and also of...

Ngày tải lên: 10/08/2014, 10:23

... number of SNPs (N = 30), of which ten were non-synonymous and three led to an exchange of amino acids of different polarity The first intron and second exon comprising 20% of the coding sequence of ... region; I: intron Failure of amplification in some of the lines may be due to the presence of SNPs/Indels in the binding sites of the sequences and/ or the absence of some of the Cbf genes in some ... of ScCbf6 and ScCbf9b, and partial coding sequences of ScCbf12, ScCbf14, and ScCbf15; ScVrn1 was not included due to a lack of pairwise comparisons, since only one Indel was observed Exons, and...

Ngày tải lên: 11/08/2014, 11:21

... the plasma and body fluids of NPC patients The aim of this study was to investigate secretion of BART miRNAs by NPC cells and their diffusion in the plasma of NPC-xenografted mice and NPC patients ... one step of at 50°C and one step of 10 minutes at 95°C It was followed by 45 cycles including one step of 15 sec at 95°C and one step of 60 sec at 60°C The following sets of primers and probes ... contributions CG and IB made RNA and c-DNA preparations and PCR analyses CG was involved in the design of the study and preparation of the manuscript AG and ASJ participated in exosome purification and study...

Ngày tải lên: 12/08/2014, 01:22

... For practice, this research offers a contribution of an identification and understanding of the factors and issues that have led to slow adoption, use and diffusion of OSNs within the older population ... The first of the theories is Diffusion The next section provides more of an understanding of diffusion employed by this research This is then followed by a description and understanding of technology ... understanding users behaviour, as this understanding allows a deeper understanding of purposes an individual has become an adopter of an a given technology Once an understanding of OSN diffusion and...

Ngày tải lên: 11/10/2014, 04:00

... Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, Committee ... volume of water or the inverse of the density of water; wv = molecular mass of water vapor (i.e., 18.016kg/kmol) ; − − u v , u v =partial pressure of pore-water vapor and saturation pressure of water ... (Aubeny and Lytton, 2003) 119 6.1 Summary of Suction Data (Cameron, 2001) 179 6.2 Number of Nodes and Elements for the Analyses 212 6.3 Mean, Standard Deviation and Percentiles...

Ngày tải lên: 13/11/2014, 10:45

Ngày tải lên: 13/11/2014, 11:08

... suspension of GO and a graphene hydrogel and (b) A graphene aerogel 71 Figure 4.2 XRD patterns of graphite, graphite oxide and graphene aerogel 72 Figure 4.3 SEM images of graphene ... enhancement of graphene 2.1.5 Potential applications of graphene Because of its outstanding and multifunctional properties, graphene has become an idea candidate for various applications Firstly, as graphene ... 2.1.2 Structure of graphene 14 2.1.3 Synthesis methods of graphene 15 2.1.4 Properties of graphene 24 2.1.5 Potential applications of graphene 28 2.2 Graphene aerogels...

Ngày tải lên: 09/09/2015, 08:11

... fieldeffect mobility of graphene is one order higher than that of Si [120] By tailoring the morphology of graphene, the Ion/Ioff ratios of graphene based TFT can be increased to 107 [121] Graphene can ... pristine graphene, (b) GO and (c) rGO [104] 20 Figure 3.1 Photographs of a MWCNT/POETE gel (a) Phase- separation behavior of the gel (upper phase) and excess POETE (lower phase) , ... valence band and conduction band of a SWCNT are composed of several individual Van Hove peaks Electrons transitions can take place between the Van Hove peaks in the different bands Such transitions...

Ngày tải lên: 10/09/2015, 08:35

... of PNP+GO-, GO and PNPB solutions at laser pulses of 532(c and e) and 1064 nm (d and f), where c) and d) show intensity-dependent scattering signals at 532 and 1064 nm, respectively, and e) and ... bond of graphene and (b) formation of bond between organic functional groups and oxygenated-groups of GO (a) Addition of free radicals to sp2-carbon of graphene: Upon heating the mixture of diazonium ... Separation of CoCl2.6 H2O solution on the top of PDI solution (color changed due to diffusion of CoCl2) and (c) After h of heating, formation of “PDI-Co” polymer precipitate (In set- SEM image of final...

Ngày tải lên: 10/09/2015, 09:13

... perpendicular to the graphene plane hybridise to form the  (valence) and * (conduction) bands of graphene At the K and K’ point of the graphene Brillouin zone (Fig 1.1b), these  and * bands meet at ... formation of graphene monolayer will also allow the fabrication process to be tailored to control the thickness of graphene and also improve the quality and properties of graphene Introduction and ... the honeycomb lattice and (c) the linear dependence of conduction () and valence (*) bands around K and K’ points Fabrication of graphene- based devices requires reliable and convenient process...

Ngày tải lên: 11/09/2015, 09:58