Surface structures and electronic states of silicon nanotubes stabilized by oxygen atoms

2007 ◽  
Vol 102 (2) ◽  
pp. 024313 ◽  
Author(s):  
Mingwen Zhao ◽  
R. Q. Zhang ◽  
Yueyuan Xia
Keyword(s):  
Electronic States ◽  
Surface Structures ◽  
Silicon Nanotubes ◽  
Oxygen Atoms

SURFACE BONDING STATES OF NANO-CRYSTALLINE DIAMOND BALLS

2001 ◽  
Vol 15 (31) ◽  
pp. 4071-4085 ◽  
Author(s):  
J. L. PENG ◽  
SHAUN BULCOCK ◽  
PETER I. BELOBROV ◽  
L. A. BURSILL
Keyword(s):  
Electron Microscopy ◽  
Chemical Vapour ◽  
Structural Models ◽  
Electronic States ◽  
Surface Structures ◽  
Atomic Scale ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Diffraction Patterns ◽  
Electron Energy Loss

The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-π* transitions, although typically the latter occupy a range of only 4 eV for the sp2 edge of highly-oriented pyrollytic graphite (HOPG). No π* electrons appear in the conduction band inside the diamond particles, where all electrons are sp3 hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp2 and sp3 states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp2/sp3 ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

Near Surface Structures and the Electronic States of Polar InN

2018 ◽  
Vol 86 (3) ◽  
pp. 103-108
Author(s):  
Yoshiyuki Yamashita ◽  
Anli Yang ◽  
Keisuke Kobayashi
Keyword(s):  
Electronic States ◽  
Surface Structures ◽  
Near Surface

Oberflächenstrukturen nach Sauerstoffadsorption auf kugelförmigen Kupfereinkristallen

1968 ◽  
Vol 23 (9) ◽  
pp. 1241-1252
Author(s):  
L. Trepte
Keyword(s):  
High Vacuum ◽  
Surface Structures ◽  
No Adsorption ◽  
Vacuum Anneal ◽  
Diffraction Patterns ◽  
Oxygen Atoms ◽  
Copper Crystals

The surfaces of spherical copper crystals were investigated by HEED (60 keV electrons). Grown by solidification of a drop of melt in high vacuum the untouched crystals only show diffraction patterns from the clean copper.After adsorption of oxygen from 10-4 to 5·10-3 torrmin. air at 800 °C extra spots appear in the diffraction patterns. They are characteristic of diffraction from twodimensional surface structures. Special structures due the adsorption of oxygen are reported for the (001), (011), (014), (223) and (035) surfaces not only for these poles but also for their surroundings. On the high indexed surfaces (014), (035) and (223) (1 × 1)-adsorption structures were observed. No adsorption structures were obtained on (111) and (112). A vacuum anneal of 400 °C destroys the adsorption structures by solution of the oxygen atoms into the bulk of the copper crystals.The adsorption structures and the boundaries of their domains do not show a relationship to the known epitaxy of threedimensional Cu2O on Cu.

scholarly journals Effects of pore surfaces on the electronic states of metal complexes formed on bipyridine periodic mesoporous organosilica

2019 ◽  
Vol 43 (6) ◽  
pp. 2471-2478 ◽  
Author(s):  
Soichi Shirai ◽  
Minoru Waki ◽  
Yoshifumi Maegawa ◽  
Yuri Yamada ◽  
Shinji Inagaki
Keyword(s):  
Metal Complexes ◽  
Electronic Properties ◽  
Theoretical Study ◽  
Electronic States ◽  
Surface Structures ◽  
Pore Surface ◽  
Periodic Mesoporous Organosilica ◽  
Mesoporous Organosilica

A combined experimental–theoretical study clarifies correlations between the pore-surface structures and the electronic properties of metal complexes on BPy-PMO.

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