Local electronic structure of UHV cleaved WS2 surface: In-situ STM and STS studies

2019 ◽  
Author(s):  
Manu Mohan ◽  
Vipin Kumar Singh ◽  
Sudipta Roy Barman ◽  
K. Bhattacharjee
Keyword(s):  
Electronic Structure ◽  
In Situ Stm ◽  
Local Electronic Structure

EELS Measurement of the Local Electronic Structure of Copper Atoms Segregated to Aluminum Grain Boundaries

1996 ◽  
Vol 54 ◽  
pp. 342-343
Author(s):  
S.J. Splinter ◽  
J. Bruley ◽  
P.E. Batson ◽  
D.A. Smith ◽  
R. Rosenberg
Keyword(s):  
Electronic Structure ◽  
Grain Boundaries ◽  
Boundary Segregation ◽  
Thin Layers ◽  
Nominal Composition ◽  
Spatially Resolved ◽  
Service Lifetime ◽  
Heat Treated ◽  
Probe Size ◽  
Local Electronic Structure

It has long been known that the addition of Cu to Al interconnects improves the resistance to electromigration failure. It is generally accepted that this improvement is the result of Cu segregation to Al grain boundaries. The exact mechanism by which segregated Cu increases service lifetime is not understood, although it has been suggested that the formation of thin layers of θ-CuA12 (or some metastable substoichiometric precursor, θ’ or θ”) at the boundaries may be necessary. This paper reports measurements of the local electronic structure of Cu atoms segregated to Al grain boundaries using spatially resolved EELS in a UHV STEM. It is shown that segregated Cu exists in a chemical environment similar to that of Cu atoms in bulk θ-phase precipitates.Films of 100 nm thickness and nominal composition Al-2.5wt%Cu were deposited by sputtering from alloy targets onto NaCl substrates. The samples were solution heat treated at 748K for 30 min and aged at 523K for 4 h to promote equilibrium grain boundary segregation. EELS measurements were made using a Gatan 666 PEELS spectrometer interfaced to a VG HB501 STEM operating at 100 keV. The probe size was estimated to be 1 nm FWHM. Grain boundaries with the narrowest projected width were chosen for analysis. EDX measurements of Cu segregation were made using a VG HB603 STEM.

A novel ligand with –NH2 and –COOH-decorated Co/Fe-based oxide for an efficient overall water splitting: dual modulation roles of active sites and local electronic structure

2020 ◽  
Vol 10 (18) ◽  
pp. 6266-6273
Author(s):  
Yalan Zhang ◽  
Zebin Yu ◽  
Ronghua Jiang ◽  
Jung Huang ◽  
Yanping Hou ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Water Splitting ◽  
Energy Demand ◽  
Active Sites ◽  
Electrode Materials ◽  
Global Energy ◽  
Overall Water Splitting ◽  
Local Electronic Structure ◽  
Electrochemical Water Splitting

Excellent electrochemical water splitting with remarkable durability can provide a solution to satisfy the increasing global energy demand in which the electrode materials play an important role.

scholarly journals Mesoscopic simulations of the in situ NMR spectra of porous carbon based supercapacitors: Electronic structure and adsorbent reorganisation effects

2021 ◽  
Author(s):  
Anagha Sasikumar ◽  
Anouar Belhboub ◽  
Camille Bacon ◽  
Alexander C. Forse ◽  
John Griffin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Nmr Spectroscopy ◽  
Molecular Species ◽  
Porous Carbon ◽  
Nmr Spectra ◽  
Charge Storage ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr ◽  
Carbon Based

In situ NMR spectroscopy is a powerful technique to investigate charge storage mechanisms in carbon-based supercapacitors thanks to its ability to distinguish ionic and molecular species adsorbed in the porous...

Characterization of electronic structure of Cu 2 ZnSn(S x Se 1−x ) 4 absorber layer and CdS/Cu 2 ZnSn(S x Se 1−x ) 4 interfaces by in-situ photoemission and inverse photoemission spectroscopies

2015 ◽  
Vol 582 ◽  
pp. 166-170 ◽  
Author(s):  
Norio Terada ◽  
Sho Yoshimoto ◽  
Kosuke Chochi ◽  
Takayuki Fukuyama ◽  
Masahiro Mitsunaga ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorber Layer ◽  
Inverse Photoemission

Local Electronic Structure of Lithium-Doped ZnO Films Investigated by X-ray Absorption Near-Edge Spectroscopy

2011 ◽  
Vol 115 (20) ◽  
pp. 10252-10255 ◽  
Author(s):  
Shu-Yi Tsai ◽  
Min-Hsiung Hon ◽  
Yang-Ming Lu
Keyword(s):  
Electronic Structure ◽  
Zno Films ◽  
X Ray ◽  
Local Electronic Structure ◽  
Doped Zno ◽  
X Ray Absorption

scholarly journals Stoichiometry and disorder influence over electronic structure in nanostructured VOx films

2021 ◽  
Vol 23 (1) ◽  
Author(s):  
A. D’Elia ◽  
S. J. Rezvani ◽  
N. Zema ◽  
F. Zuccaro ◽  
M. Fanetti ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Distorted Octahedral Geometry ◽  
Edge Structure ◽  
Distorted Octahedral ◽  
X Ray Absorption ◽  
Complex Matter ◽  
Nanometric Size

AbstractWe present and discuss the role of nanoparticles size and stoichiometry over the local atomic environment of nanostructured VOx films. The samples have been characterized in situ using X-ray absorption near-edge structure (XANES) spectroscopy identifying the stoichiometry-dependent fingerprints of disordered atomic arrangement. In vanadium oxides, the ligand atoms arrange according to a distorted octahedral geometry depending on the oxidation state, e.g. trigonal distortion in V2O3 and tetragonal distortion in bulk VO2. We demonstrate, taking VO2 as a case study, that as a consequence of the nanometric size of the nanoparticles, the original ligands symmetry of the bulk is broken resulting in the coexistence of a continuum of distorted atomic conformations. The resulting modulation of the electronic structure of the nanostructured VOx as a function of the oxygen content reveals a stoichiometry-dependent increase of disorder in the ligands matrix. This work shows the possibility to produce VOx nanostructured films accessing new disordered phases and provides a unique tool to investigate the complex matter.

Local Electronic Structure of Olivine Phases of LixFePO4

2007 ◽  
Vol 111 (20) ◽  
pp. 4242-4247 ◽  
Author(s):  
Shu Miao ◽  
Michael Kocher ◽  
Peter Rez ◽  
Brent Fultz ◽  
Rachid Yazami ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Local Electronic Structure

Local electronic structure in aLiAlO2single crystal studied withLi7NMR spectroscopy and comparison with quantum chemical calculations

2006 ◽  
Vol 74 (24) ◽  
Author(s):  
Sylvio Indris ◽  
Paul Heitjans ◽  
Reinhard Uecker ◽  
Thomas Bredow
Keyword(s):  
Electronic Structure ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Local Electronic Structure

scholarly journals Local electronic structure of intrinsic defects and impurities at the Fe(001) surface

2000 ◽  
Vol 445 (1) ◽  
pp. 123-129 ◽  
Author(s):  
C.M. Fang ◽  
R.A. de Groot ◽  
M.M.J. Bischoff ◽  
H. van Kempen
Keyword(s):  
Electronic Structure ◽  
Intrinsic Defects ◽  
Local Electronic Structure ◽  
Defects And Impurities
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