On the Nature of Red Shift of the Raman G Peak in an Epitaxial Two-Dimensional Layer

2021 ◽  
Author(s):  
S. Yu. Davydov ◽  
O. V. Posrednik
Keyword(s):  
Red Shift ◽  
Two Dimensional

scholarly journals Two Regimes of Bandgap Red Shift and Partial Ambient Retention in Pressure-Treated Two-Dimensional Perovskites

2017 ◽  
Vol 2 (11) ◽  
pp. 2518-2524 ◽  
Author(s):  
Gang Liu ◽  
Lingping Kong ◽  
Peijun Guo ◽  
Constantinos C. Stoumpos ◽  
Qingyang Hu ◽  
...  
Keyword(s):  
Red Shift ◽  
Two Dimensional

Structural reconstruction and visible-light absorption versus internal electrostatic field in two-dimensional GaN-ZnO alloys

Nanoscale ◽  
2021 ◽  
Author(s):  
Hanpu Liang ◽  
Yifeng Duan
Keyword(s):  
Visible Light ◽  
Electrostatic Field ◽  
Light Absorption ◽  
Red Shift ◽  
Two Dimensional ◽  
Visible Light Absorption ◽  
Visible Light Range ◽  
Optoelectronic Applications

GaN-ZnO alloys are more promising semiconductors than their counterparts for optoelectronic applications due to the abrupt red shift in the visible-light range. Unfortunately, the strong internal electrostatic field (IEF) seriously...

Three isomorphous two-dimensional coordination polymers generated from a benzimidazole bridging ligand and ZnX2(X= Cl, Br and I)

2013 ◽  
Vol 69 (4) ◽  
pp. 367-371
Author(s):  
Yue-Feng Zhang ◽  
Jian-Ping Ma ◽  
Qi-Kui Liu ◽  
Yu-Bin Dong
Keyword(s):  
Solid State ◽  
Benzoic Acid ◽  
Coordination Polymers ◽  
Room Temperature ◽  
Three Dimensional ◽  
Luminescent Properties ◽  
Red Shift ◽  
Two Dimensional ◽  
Π Interactions ◽  
Bridging Ligand

A novel bridging asymmetric benzimidazole ligand, 4-{2-[3-(pyridin-4-yl)phenyl]-1H-benzimidazol-1-ylmethyl}benzoic acid, was used to construct three isomorphous two-dimensional coordination polymers, namelycatena-poly[chlorido(μ3-4-{2-[3-(pyridin-4-yl)phenyl]-1H-benzimidazol-1-ylmethyl}benzoato)zinc(II)], [Zn(C26H18N3O2)Cl]n, (I), and the bromide, (II), and iodide, (III), analogues. Neighbouring two-dimensional networks are stacked into three-dimensional frameworksviainterlayer π–π interactions. The luminescent properties of (I)–(III) were investigated and they display an obvious red-shift in the solid state at room temperature.

Plasmon excitations in doped square-lattice atomic clusters

2017 ◽  
Vol 31 (30) ◽  
pp. 1750233 ◽  
Author(s):  
Yaxin Wang ◽  
Ya-Bin Yu
Keyword(s):  
Tight Binding ◽  
Blue Shift ◽  
Coulomb Repulsion ◽  
Atomic Clusters ◽  
Red Shift ◽  
Square Lattice ◽  
Local Mode ◽  
Two Dimensional ◽  
Binding Model ◽  
Dopant Atoms

Employing the tight-binding model, we theoretically study the properties of the plasmon excitations in doped square-lattice atomic clusters. The results show that the dopant atoms would blur the absorption spectra, and give rise to extra plasmon resonant peaks as reported in the literature; however, our calculated external-field induced oscillating charge density shows that no obvious evidences indicate the so-called local mode of plasmon appearing in two-dimensional-doped atomic clusters, but the dopants may change the symmetry of the charge distribution. Furthermore, we show that the disorder of the energy level due to dopant makes the absorption spectrum has a red- or blue-shift, which depends on the position of impurities; disorder of hopping due to dopant makes a blue- or red-shift, a larger (smaller) hopping gives a blue-shift (red-shift); and a larger (smaller) host-dopant and dopant–dopant intersite coulomb repulsion induces a blue-shift (red-shift).

Imaging of oxygen gradients in monolayer cultured cells using green fluorescent protein

2010 ◽  
Vol 299 (6) ◽  
pp. C1318-C1323 ◽  
Author(s):  
Eiji Takahashi ◽  
Michihiko Sato
Keyword(s):  
Green Fluorescent Protein ◽  
Diffusion Model ◽  
Fluorescent Protein ◽  
Cultured Cells ◽  
Red Shift ◽  
Two Dimensional ◽  
Fluorescence Measurements ◽  
Hep3b Cells ◽  
Green Fluorescent ◽  
The Impact

Gradients of Po2 between capillary blood and mitochondria are the driving force for diffusional O2 delivery in tissues. Hypoxic microenvironments in tissues that result from diffusional O2 gradients are especially relevant in solid tumors because they have been related to a poor prognosis. To address the impact of tissue O2 gradients, we developed a novel technique that permits imaging of intracellular O2 levels in cultured cells at a subcellular spatial resolution. This was done, with the sensitivity to O2 ≤3%, by the O2-dependent red shift of green fluorescent protein (AcGFP1) fluorescence. Measurements were carried out in a confluent monolayer of Hep3B cells expressing AcGFP1 in the cytoplasm. To establish a two-dimensional O2 diffusion model, a thin quartz glass slip was placed onto the monolayer cells to prevent O2 diffusion from the top surface of the cell layer. The magnitude of the red shift progressively increased as the distance from the gas coverslip interface increased. It reached an anoxic level in cells located at ∼220 μm and ∼690 μm from the gas coverslip boundary at 1% and 3% gas phase O2, respectively. Thus the average O2 gradient was 0.03 mmHg/μm in the present tissue model. Abolition of mitochondrial respiration significantly dampened the gradients. Furthermore, intracellular gradients of the red shift in mitochondria-targeted AcGFP1 in single Hep3B cells suggest that the origin of tissue O2 gradients is intracellular. Findings in the present two-dimensional O2 diffusion model support the crucial role of tissue O2 diffusion in defining the O2 microenvironment in individual cells.

`0'- and `8'-shaped complexes generated from a nano-sized oxadiazole-containing organic ligand with CdI2and CuI

2013 ◽  
Vol 70 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Zhao-Cai Liu ◽  
Qi-Kui Liu ◽  
Yan-An Li ◽  
Jian-Ping Ma ◽  
Yu-Bin Dong
Keyword(s):  
Solid State ◽  
Mirror Symmetry ◽  
Room Temperature ◽  
Organic Ligand ◽  
Red Shift ◽  
Luminescence Properties ◽  
Two Dimensional ◽  
One Dimensional ◽  
Π Interactions ◽  
Dimensional Network

A new nano-sized rigid double-armed oxadiazole-bridged organic ligand, 2,5-bis{2-methyl-5-[2-(pyridin-3-yl)ethenyl]phenyl}-1,3,4-oxadiazole, C30H20N4O,Lor (I), which adopts acisconformation in the solid state, has been synthesized and used to create the two novel metallocycle complexes (2,5-bis{2-methyl-5-[2-(pyridin-3-yl-κN)ethenyl]phenyl}-1,3,4-oxadiazole)diiodidocadmium(II) dichloromethane monosolvate, [CdI2(C30H20N4O)]·CH2Cl2, (II), and di-μ-iodido-bis[(2,5-bis{2-methyl-5-[2-(pyridin-3-yl-κN)ethenyl]phenyl}-1,3,4-oxadiazole)copper(I)], [Cu2I2(C30H20N4O)2], (III). Molecules of complex (II) adopts a 20-membered `0'-shaped metallocycle structure with crystallographic mirror symmetry. The discrete units are linked into one-dimensional chains through intermolecular π–π and C—H...π interactions. In (III), the two I atoms and two CuIatoms form a {Cu2(μ-I)2} cluster. One {Cu2(μ-I)2} cluster and twoLligands form two 20-membered monometallic rings in a head-to-head fashion, leading to a discrete centrosymmetric `8'-shaped metallocyclic complex. These metallocycles stack togetherviatwo kinds of intermolecular π–π interactions to generate a two-dimensional network in theacplane. The luminescence properties of (I)–(III) were investigated in the solid state at room temperature and displayed an obvious red shift.

scholarly journals The High Coercivity Field in Chemically Bonded WSe2/MoSe2 Powder

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3263
Author(s):  
Shiu-Ming Huang ◽  
Pin-Cyuan Chen ◽  
Pin-Cing Wang
Keyword(s):  
Magnetic Properties ◽  
Transition Metal ◽  
Chemical Bonding ◽  
Transition Metal Dichalcogenides ◽  
Red Shift ◽  
High Coercivity ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
Coercivity Field ◽  
Zigzag Structure

We studied the magnetic properties of WSe2/MoSe2 powder. The coercivity field reaches 2600 Oe at 5 K, 4233 Oe at 100 K and 1300 Oe at 300 K. These are the highest values reported for two-dimensional transition metal dichalcogenides. This study is different from the widely reported vacancy and zigzag structure-induced ferromagnetism studies. Importantly, a Raman peak red shift was observed, and that supports the chemical bonding at the interface between WSe2 and MoSe2. The large coercivity field originates from the chemical bonding-induced structural distortion at the interface between WSe2 and MoSe2.

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Sign in / Sign up

Export Citation Format

Share Document