Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Edge states

FIGURE 1.14 Armchair (a) and zigzag (b) edges in graphene. (With permission from Koskinen, P. et al., Phys. Rev. Lett., 101, Copyright 2008 by the American Physical Society.) [Pg.22]


Figure 17.3 Energy level diagram (A) and splitting of lSelS3/2 band-edge states (B) in CdSe quantum dots. Reprinted with permission from references [17] (A) and [16] (B) copyright [1999,... Figure 17.3 Energy level diagram (A) and splitting of lSelS3/2 band-edge states (B) in CdSe quantum dots. Reprinted with permission from references [17] (A) and [16] (B) copyright [1999,...
In the case of palladium particles supported on magnesium oxide, Heiz and his colleagues have shown,29 in an elegant study, a correlation between the number of palladium atoms in a cluster and the selectivity for the conversion of acetylene to benzene, butadiene and butane, whereas in the industrially significant area of catalytic hydrodesulfurisation, the Aarhus group,33 with support from theory, have pinpointed by STM metallic edge states as the active sites in the MoS2 catalysts. [Pg.176]

K. Nakada, M. Fujita, G. Dresselhaus, M. S. Dresselhaus, Edge state in graphene ribbons Nanometer size effect and edge shape dependence, Phys. Rev. B, vol. 54, pp. 17954-17961, 1996. [Pg.105]

Fig. 9 STM image (48 x 53 A Ft = 5.3 mV 1-28 nA) showing a M0S2 nanocluster synthesized on a reconstructed Au(l 11) surface. The bright brim extending all the way around the edge is due to localized metallic edge states. Reprinted figure with permission from Bollinger et ai, Physical Review Letters, 2001, 87, 196803. " American Physical Society. Fig. 9 STM image (48 x 53 A Ft = 5.3 mV 1-28 nA) showing a M0S2 nanocluster synthesized on a reconstructed Au(l 11) surface. The bright brim extending all the way around the edge is due to localized metallic edge states. Reprinted figure with permission from Bollinger et ai, Physical Review Letters, 2001, 87, 196803. " American Physical Society.
Joseph Joly VL, Kiguchi M, Hao Si-Jia et al (2010) Observation of magnetic edge state in graphene nanoribbons. Phys Rev B 81 245428... [Pg.171]

The lowest-energy-resolved features in the absorption spectrum of M0S2-type semiconductors are the A and B excitons, shown in Fig. 3 for the case of M0S2 [30]. The dissociation limit of peaks built off of the A exciton correspond to the direct band edge. Calculations indicate that these transitions are at K and that the A and B excitons correspond to K4 K5 and K1 K5, respectively [25,26]. The lowest-energy direct-transition excited states have considerably different orbital character than the band-edge state. K1 and K4 correspond to 84% and 82% dyy, respectively corresponds to 77%... [Pg.177]

III. The corresponding Kohn-Sham wave functions (Fig. 16b) show that the metallic edge states I and II are localized entirely on the molybdenum edge with sulfur dimers, whereas edge state III is associated with the fully covered sulfur edge (not shown). [Pg.122]

Fig. 17. STM image of thiophene on the triangular M0S2 nanoclusters at a sample temperature below 200 K. Thiophene molecules are evident in positions on top of the bright brim associated with an edge state (dark circles), and additionally thiophene decorates the perimeter of the cluster (gray striped circle). For clarity, the color scale in this image is circled twice to enhance contrast. At temperatures > 240 K, no indications of adsorbed thiophene were observed with STM. Fig. 17. STM image of thiophene on the triangular M0S2 nanoclusters at a sample temperature below 200 K. Thiophene molecules are evident in positions on top of the bright brim associated with an edge state (dark circles), and additionally thiophene decorates the perimeter of the cluster (gray striped circle). For clarity, the color scale in this image is circled twice to enhance contrast. At temperatures > 240 K, no indications of adsorbed thiophene were observed with STM.
D.4. Energetics and Reaction Pathways Metallic Edge States as Active Sites... [Pg.129]

Asymmetric conductors have isymmetric I — V curves. This phenomenon is known as the diode or ratchet effect and plays a major role in electronics. Recently much interest has been attracted by transport asymmetries in singlemolecule devices and other mesoscopic systems [1], The idea that asymmetric molecules can be used as rectifiers is rather old [2], however, it was implemented experimentally [3] only recently. Another experimental realization of a mesoscopic rectifier is an asymmetric electron waveguide constructed within the inversion layer of a semiconductor heterostructure [4]. The ratchet effect was observed in carbon nanotubes [5], and strongly asymmetric I — V curves were recently reported for the tunneling in the quantum Hall edge states [6]. These experimental advances have stimulated much theoretical activity [7, 8, 9, 10, 11] with the main focus on the simplest Fermi-liquid systems [12]. [Pg.147]

FIGURE 6.23 (a) The wave number dependence of the populations of the edge state, (b) the energy... [Pg.250]


See other pages where Edge states is mentioned: [Pg.139]    [Pg.298]    [Pg.170]    [Pg.170]    [Pg.92]    [Pg.437]    [Pg.451]    [Pg.508]    [Pg.510]    [Pg.510]    [Pg.513]    [Pg.152]    [Pg.139]    [Pg.177]    [Pg.194]    [Pg.122]    [Pg.122]    [Pg.122]    [Pg.123]    [Pg.123]    [Pg.125]    [Pg.125]    [Pg.128]    [Pg.131]    [Pg.134]    [Pg.135]    [Pg.134]    [Pg.160]    [Pg.160]    [Pg.248]    [Pg.248]    [Pg.249]    [Pg.250]    [Pg.251]    [Pg.252]    [Pg.252]    [Pg.252]    [Pg.255]   
See also in sourсe #XX -- [ Pg.122 , Pg.134 ]

See also in sourсe #XX -- [ Pg.122 , Pg.134 ]

See also in sourсe #XX -- [ Pg.554 ]




SEARCH



Edge States Versus Dilute Magnetism

Edge states metallic

Energetics and Reaction Pathways Metallic Edge States as Active Sites

© 2024 chempedia.info