Improving Electronic Conductivity and Oxygen Reduction Activity in Sr-Doped Lanthanum Cobaltite Thin Films: Cobalt Valence State and Electronic Band Structure Effects

2018 ◽  
Author(s):  
Zhaoxin Zhu ◽  
Yanuo Shi ◽  
Carmela Aruta ◽  
Nan Yang
Keyword(s):  
Thin Films ◽  
Band Structure ◽  
Oxygen Reduction ◽  
Valence State ◽  
Electronic Band Structure ◽  
Electronic Conductivity ◽  
Electronic Band ◽  
Lanthanum Cobaltite ◽  
Reduction Activity

Electronic band structure of gallium nitride: a comparative angle-resolved photoemission study of single crystals and thin films

2002 ◽  
Vol 507-510 ◽  
pp. 223-228 ◽  
Author(s):  
L. Plucinski ◽  
T. Strasser ◽  
B.J. Kowalski ◽  
K. Rossnagel ◽  
T. Boetcher ◽  
...  
Keyword(s):  
Thin Films ◽  
Gallium Nitride ◽  
Band Structure ◽  
Single Crystals ◽  
Electronic Band Structure ◽  
Electronic Band ◽  
Photoemission Study

Critical role of {002} preferred orientation on electronic band structure of electrodeposited monoclinic WO3 thin films

2018 ◽  
Vol 2 (10) ◽  
pp. 2224-2236 ◽  
Author(s):  
Wai Ling Kwong ◽  
Pramod Koshy ◽  
Judy N. Hart ◽  
Wanqiang Xu ◽  
Charles C. Sorrell
Keyword(s):  
Thin Films ◽  
Band Structure ◽  
Oxygen Vacancies ◽  
Electronic Band Structure ◽  
Critical Role ◽  
Preferred Orientation ◽  
Electronic Band ◽  
Wo3 Thin Films

Decoupled effects of crystallographic {002} orientation and oxygen vacancies on the electronic band structure of monoclinic WO3 films.

Nanostructure Dependence of the Electronic Conductivity of Carbon Nanotubes and Graphene Sheets

2010 ◽  
Author(s):  
Masato Ohnishi ◽  
Katsuya Ohsaki ◽  
Yusuke Suzuki ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Aspect Ratio ◽  
Band Structure ◽  
Band Gap ◽  
Critical Strain ◽  
Electronic Band Structure ◽  
Electronic Conductivity ◽  
Membered Ring ◽  
Applied Strain ◽  
Dominant Factor ◽  
Electronic Band

In this study, the change of the resistivity of the CNT-dispersed resin was analyzed by applying a quantum chemical molecular dynamics and the first principle calculation. Various combinations of double-walled carbon nanotube structures were modeled for the analysis. The change of the band structure was calculated by changing the amplitude of the applied strain. It was found in some cases that the band structure changes drastically from a metallic structure to a semiconductive structure, and this result clearly indicated that the electronic conductivity of this MWCNT decreased significantly under tensile strain. It was also found that further application of the strain made a band gap in the band structure. This result indicated that the metallic CNT changes a semiconductive CNT due to the applied strain. The effect of the diameter of the zigzag type CNT on the critical strain of buckling deformation was analyzed under a uni-axial strain. In this analysis, the aspect ratio of each structure was fixed at 10. It was found that the critical strain decreased monotonically with the increase of the diameter. This was because that the flexural rigidity of a cylinder decreased with the increase of its diameter when the thickness of the wall of the cylinder is fixed. It was found that the critical strain decreased drastically from about 5% to 0.5% when the aspect ratio was changed from 10 to 30. Since the typical aspect ratio of CNTs often exceeds 1000, most CNTs show buckling deformation when an axial compressive strain was applied to the CNTs. Finally, the shape of six-membered ring of the CNT was found to be the dominant factor that determines the electronic band structure of a CNT. Next, the change of the band structure of a graphene sheet was analyzed by applying the abinitio calculation (Density functional theory). It was found that the fluctuation of the atomic distance among the six-membered ring is the most dominant factor of the electronic band structure. When the fluctuation exceeded about 10%, band gap appeared in the deformed six-membered ring, and thus, the electronic conductivity of the graphene sheet changes from metallic one to semiconductive one. It is therefore, possible to predict the change of the electronic conductivity of a CNT by considering the local shape of a six-membered ring in the deformed CNT.

Computational Analysis of Strain Effects on Electrical Transport Properties of Crystalline Nanocomposite Thin Films

2011 ◽  
Author(s):  
Hua Li ◽  
Gang Li
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Band Structure ◽  
Transport Properties ◽  
Electrical Transport ◽  
Electronic Band Structure ◽  
Electrical Transport Properties ◽  
Electronic Band ◽  
Strain Effects ◽  
Nanocomposite Thin Films

In this work, we model the strain effects on the electrical transport properties of Si/Ge nanocomposite thin films. We utilize a two-band k·p theory to calculate the variation of the electronic band structure as a function of externally applied strains. By using the modified electronic band structure, electrical conductivity of the Si/Ge nanocomposites is calculated through a self-consistent electron transport analysis, where a nonequilibrium Green’s function (NEGF) is coupled with the Poisson equation. The results show that both the tensile uniaxial and biaxial strains increase the electrical conductivity of Si/Ge nanocomposite. The effects are more evident in the biaxial strain cases.

Influence of the Cation on the Surface Electronic Band Structure and Magnetic Properties of Mn:ZnS and Mn:CdS Quantum Dot Thin Films

2019 ◽  
Vol 123 (40) ◽  
pp. 24890-24898 ◽  
Author(s):  
Andrew J. Yost ◽  
Thilini K. Ekanayaka ◽  
Gautam Gurung ◽  
Gaurab Rimal ◽  
Sabit Horoz ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Quantum Dot ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Electronic Band

Microstructure, optical property, and electronic band structure of cuprous oxide thin films

2011 ◽  
Vol 110 (10) ◽  
pp. 103503 ◽  
Author(s):  
Jun-Woo Park ◽  
Hyungkeun Jang ◽  
Sung Kim ◽  
Suk-Ho Choi ◽  
Hosun Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Property ◽  
Band Structure ◽  
Cuprous Oxide ◽  
Electronic Band Structure ◽  
Oxide Thin Films ◽  
Electronic Band

scholarly journals Dielectric functions and electronic band structure of lead zirconate titanate thin films

2005 ◽  
Vol 98 (9) ◽  
pp. 094108 ◽  
Author(s):  
Hosun Lee ◽  
Youn Seon Kang ◽  
Sang-Jun Cho ◽  
Bo Xiao ◽  
Hadis Morkoç ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Structure ◽  
Lead Zirconate Titanate ◽  
Electronic Band Structure ◽  
Lead Zirconate ◽  
Electronic Band ◽  
Zirconate Titanate

Crystal order in pentacene thin films grown on SiO2 and its influence on electronic band structure

2011 ◽  
Vol 12 (1) ◽  
pp. 195-201 ◽  
Author(s):  
R. Matsubara ◽  
M. Sakai ◽  
K. Kudo ◽  
N. Yoshimoto ◽  
I. Hirosawa ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Electronic Band
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