Two dimensional Sr silicate grown on Si(001) studied using X-ray Photoelectron Spectroscopy

2006 ◽  
Vol 132 ◽  
pp. 87-90
Author(s):  
M. El Kazzi ◽  
G. Delhaye ◽  
S. Gaillard ◽  
E. Bergignat ◽  
G. Hollinger
Keyword(s):  
Photoelectron Spectroscopy ◽  
Two Dimensional ◽  
X Ray

Morphology of Silver Thin Films Deposited on TiO2(110) Surfaces

1998 ◽  
Vol 05 (01) ◽  
pp. 387-392 ◽  
Author(s):  
D. Abriou ◽  
D. Gagnot ◽  
J. Jupille ◽  
F. Creuzet
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Two Dimensional ◽  
Silver Films ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Silver Deposits ◽  
Silver Thin Films

The growth mode of silver films deposited at room temperature on TiO 2(110) surfaces has been examined by means of atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) in ultrahigh vacuum (UHV) conditions, On clean vacancy-free TiO 2(110) surfaces, 0.1-nm-thick (on average) Ag deposits form a two-dimensional (2D) layer. When the thickness of the silver overlayer is increased, 3D clusters are shown to appear while the 2D film is preserved, furthermore, the influence of surface oxygen vacancies on the growth of Ag/TiO 2(110) is evidenced by well-characterized differences in the morphology of 9-nm-thick silver deposits.

scholarly journals Polyether-Based Supramolecular Electrolytes With Two-Dimensional Boroxine Skeleton

2021 ◽  
Vol 9 ◽  
Author(s):  
Masahiro Yoshizawa-Fujita ◽  
Shunsuke Horiuchi ◽  
Tamao Uemiya ◽  
Jun Ishii ◽  
Yuko Takeoka ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Lithium Ion ◽  
Linear Sweep Voltammetry ◽  
Transference Number ◽  
Rechargeable Batteries ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Two Dimensional ◽  
X Ray ◽  
Number Of Cycles

Solid polymer electrolytes mainly based on polyethers have been actively investigated for over 40 years to develop safe, light, and flexible rechargeable batteries. Here, we report novel supramolecular electrolytes (SMEs) composed of polyether derivatives and a two-dimensional boroxine skeleton synthesized by the dehydration condensation of 1,4-benzenediboronic acid in the presence of a polyether with amines on both chain ends. The formation of SMEs based on polyether derivatives and boroxine skeleton was confirmed by Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD), and thermogravimetric (TG) analysis. Linear sweep voltammetry (LSV) and cyclic voltammetry (CV) were performed to evaluate the electrochemical stability and lithium conductive properties of SMEs with given amounts of lithium bis(trifluoromethylsulfonyl)amide (LiTFSA). The ionic conductivity of SME/LiTFSA composites increased with increasing lithium-salt concentration and reached a maximum value at a higher concentration than those of simple polyether systems. The lithium-ion transference number (tLi+) of SME/LiTFSA was higher than those of polyether electrolytes. This tendency is unusual for a polyether matrix. SME/LiTFSA composite electrolytes exhibited a stable lithium plating/striping process even after 100 cycles. The current density increased with an increasing number of cycles. The combination of ion conductive polymers and a two-dimensional boroxine skeleton will be an interesting concept for developing solid electrolytes with good electrochemical properties.

A Co-MOF with a (4,4)-connected binodal two-dimensional topology: synthesis, structure and photocatalytic properties

2019 ◽  
Vol 76 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Zhi-Xiang Wang ◽  
Hai-Xin Tian ◽  
Jian-Gang Ding ◽  
Bao-Long Li ◽  
Bing Wu
Keyword(s):  
Dicarboxylic Acid ◽  
Photoelectron Spectroscopy ◽  
Optical Band Gap ◽  
Three Dimensional ◽  
Supramolecular Architecture ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Bond Interactions ◽  
Point Symbol

The Co-MOF poly[[diaqua{μ4-1,1,2,2-tetrakis[4-(1H-1,2,4-triazol-1-yl)phenyl]ethylene-κ4 N:N′:N′′:N′′′}cobalt(II)] benzene-1,4-dicarboxylic acid benzene-1,4-dicarboxylate], {[Co(C34H24N12)(H2O)2](C8H4O4)·C8H6O4} n or {[Co(ttpe)(H2O)2](bdc)·(1,4-H2bdc)} n , (I), was synthesized by the hydrothermal method using 1,1,2,2-tetrakis[4-(1H-1,2,4-triazol-1-yl)phenyl]ethylene (ttpe), benzene-1,4-dicarboxylic acid (1,4-H2bdc) and Co(NO3)2·6H2O, and characterized by single-crystal X-ray diffraction, IR spectroscopy, powder X-ray diffraction (PXRD), luminescence, optical band gap and valence band X-ray photoelectron spectroscopy (VB XPS). Co-MOF (I) shows a (4,4)-connected binodal two-dimensional topology with a point symbol of {44·62}{44·62}. The two-dimensional networks capture free neutral 1,4-H2bdc molecules and bdc2− anions, and construct a three-dimensional supramolecular architecture via hydrogen-bond interactions. MOF (I) is a good photocatalyst for the degradation of methylene blue and rhodamine B under visible-light irradiation and can be reused at least five times.

scholarly journals Two-Dimensional X-ray Photoelectron Spectroscopy for Composite Surface Analysis

2008 ◽  
Vol 80 (10) ◽  
pp. 3931-3936 ◽  
Author(s):  
Sefik Suzer ◽  
Hikmet Sezen ◽  
Aykutlu Dâna
Keyword(s):  
Surface Analysis ◽  
Photoelectron Spectroscopy ◽  
Two Dimensional ◽  
Composite Surface ◽  
X Ray

Valence band density of states and X-ray photoelectron spectrum of GaS

1978 ◽  
Vol 56 (6) ◽  
pp. 700-703 ◽  
Author(s):  
A. Balzarotti ◽  
R. Girlanda ◽  
V. Grasso ◽  
E. Doni ◽  
F. Antonangeli ◽  
...  
Keyword(s):  
Fine Structure ◽  
Valence Band ◽  
Density Of States ◽  
Photoelectron Spectroscopy ◽  
Photoelectron Spectrum ◽  
Tight Binding ◽  
Single Layer ◽  
Two Dimensional ◽  
X Ray ◽  
Dimensional Approximation

The valence band density of states of GaS has been investigated by X-ray photoelectron spectroscopy and the spectrum has been interpreted on the basis of a single layer tight-binding calculation. Our two-dimensional approximation seems largely appropriate to reproduce the main experimental features of the valence band density of states of GaS, as previously found in the case of InSe. It can also explain to some extent the fine structure in the ultraviolet photoemission spectra recently measured with the synchroton radiation.

scholarly journals Demonstration of the key substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Soohyung Park ◽  
Thorsten Schultz ◽  
Xiaomin Xu ◽  
Berthold Wegner ◽  
Areej Aljarb ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Photoelectron Spectroscopy ◽  
Electronic Devices ◽  
Electronic Coupling ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Monolayer Mos2 ◽  
X Ray ◽  
Molecular Electron ◽  
Transfer Mechanisms

Abstract Tuning the Fermi level (EF) in two-dimensional transition metal dichalcogenide (TMDC) semiconductors is crucial for optimizing their application in (opto-)electronic devices. Doping by molecular electron acceptors and donors has been suggested as a promising method to achieve EF-adjustment. Here, we demonstrate that the charge transfer (CT) mechanism between TMDC and molecular dopant depends critically on the electrical nature of the substrate as well as its electronic coupling with the TMDC. Using angle-resolved ultraviolet and X-ray photoelectron spectroscopy, we reveal three fundamentally different, substrate-dependent CT mechanisms between the molecular electron acceptor 1,3,4,5,7,8-hexafluoro-tetracyano-naphthoquinodimethane (F6TCNNQ) and a MoS2 monolayer. Our results demonstrate that any substrate that acts as charge reservoir for dopant molecules can prohibit factual doping of a TMDC monolayer. On the other hand, the three different CT mechanisms can be exploited for the design of advanced heterostructures, exhibiting tailored electronic properties in (opto-)electronic devices based on two-dimensional semiconductors.

Band alignment of two-dimensional h-BN/MoS2 van der Waals heterojunction measured by X-ray photoelectron spectroscopy

2020 ◽  
Vol 834 ◽  
pp. 155108 ◽  
Author(s):  
Shu’an Xing ◽  
Guijuan Zhao ◽  
Jie Wang ◽  
Yan Xu ◽  
Zhixin Ma ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Van Der Waals ◽  
Band Alignment ◽  
Two Dimensional ◽  
X Ray

scholarly journals Switching adsorption and growth behavior of ultrathin [C2C1Im][OTf] films on Au(111) by Pd deposition

2016 ◽  
Vol 18 (36) ◽  
pp. 25143-25150 ◽  
Author(s):  
F. Rietzler ◽  
B. May ◽  
H.-P. Steinrück ◽  
F. Maier
Keyword(s):  
Ionic Liquid ◽  
Photoelectron Spectroscopy ◽  
Three Dimensional ◽  
Liquid Films ◽  
Growth Behavior ◽  
Growth Mode ◽  
Two Dimensional ◽  
X Ray ◽  
Dimensional Growth

In vacuo deposition of ultrathin ionic liquid films combined with angle-resolved X-ray photoelectron spectroscopy demonstrates that the initial three-dimensional growth mode of [C2C1Im][OTf] deposited onto the bare Au(111) surface can be switched to two-dimensional growth by adding submonolayer amounts of Pd.

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