Thermal Interfacial Resistance Reduction Between Metal and Dielectric Materials by Inserting Intermediate Metal Layer

2016 ◽  
Author(s):  
Xiangyu Li ◽  
Wonjun Park ◽  
Yong P. Chen ◽  
Xiulin Ruan
Keyword(s):  
Aluminum Oxide ◽  
Lattice Mismatch ◽  
Coupling Effect ◽  
Metal Layer ◽  
Dielectric Materials ◽  
Dominant Factor ◽  
Phonon Coupling ◽  
Interfacial Resistance ◽  
Oxide Interface ◽  
Electron Phonon Coupling

In this work, we have observed 60% reduction in total interfacial resistance by adding an intermediate metal layer nickel between gold and aluminum oxide. Two temperature model is applied to explain the change of interfacial resistance, including both lattice mismatch with diffuse mismatch model and electron-phonon coupling effect. Simulation result agrees reasonably well with experimental data. Even though interfacial resistance due to electron-phonon coupling effect for Au-aluminum oxide is much larger than that of Ni-aluminum oxide interface, lattice mismatch is still the dominant factor for interfacial resistance.

scholarly journals Creating better superconductors by periodic nanopatterning

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Milan Allan ◽  
Mark H Fischer ◽  
Oliver Ostojic ◽  
Arjo Andringa
Keyword(s):  
Thin Films ◽  
Transition Temperature ◽  
Numerical Methods ◽  
Model Calculation ◽  
Lattice Mismatch ◽  
Specific Pattern ◽  
Design Parameters ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Correct Design

The quest to create superconductors with higher transition temperatures is as old as superconductivity itself. One strategy, popular after the realization that (conventional) superconductivity is mediated by phonons, is to chemically combine different elements within the crystalline unit cell to maximize the electron-phonon coupling. This led to the discovery of NbTi and Nb_33Sn, to name just the most technologically relevant examples. Here, we propose a radically different approach to transform a ‘pristine’ material into a better (meta-) superconductor by making use of modern fabrication techniques: designing and engineering the electronic properties of thin films via periodic patterning on the nanoscale. We present a model calculation to explore the key effects of different supercells that could be fabricated using nanofabrication or deliberate lattice mismatch, and demonstrate that specific pattern will enhance the coupling and the transition temperature. We also discuss how numerical methods could predict the correct design parameters to improve superconductivity in materials including Al, NbTi, and MgB_22.

Electron–Phonon Coupling Effect on Charge Transfer in Nanostructures

2013 ◽  
Vol 117 (2) ◽  
pp. 850-857 ◽  
Author(s):  
Guangqi Li ◽  
Bijan Movaghar ◽  
Mark A. Ratner
Keyword(s):  
Charge Transfer ◽  
Coupling Effect ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Oxygen induced strained ZnO nanoparticles: an investigation of Raman scattering and visible photoluminescence

2014 ◽  
Vol 2 (35) ◽  
pp. 7264-7274 ◽  
Author(s):  
Shrikrushna Shivaji Gaikwad ◽  
Ashish Chhaganlal Gandhi ◽  
Swarada D. Pandit ◽  
Jayashree Pant ◽  
Ting-Shan Chan ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Zno Nanoparticles ◽  
Short Range ◽  
Coupling Effect ◽  
Poisson Ratio ◽  
Red Shift ◽  
Phonon Coupling ◽  
Visible Photoluminescence ◽  
Electron Phonon Coupling ◽  
Pl Spectrum

Raman and photoluminescence measurements results reveal a positive Poisson ratio in strained ZnO nanoparticles, signaling the short-range electron–phonon coupling effect and an energy red-shift in the PL spectrum.

Electron–phonon coupling mechanisms of broadband near-infrared emissions from Cr3+ in the Ca3Sc2Si3O12 garnet

2020 ◽  
Vol 22 (18) ◽  
pp. 10343-10350 ◽  
Author(s):  
Zhenwei Jia ◽  
Chenxu Yuan ◽  
Ruiyang Li ◽  
Peng Sun ◽  
Rui Dong ◽  
...  
Keyword(s):  
Near Infrared ◽  
Coupling Effect ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Nir Emission ◽  
Infrared Emissions ◽  
First Time ◽  
Coupling Mechanisms

The electron–phonon coupling effect resulting in broad NIR emission in Ca3Sc2Si3O12:Cr3+ is revealed for the first time.

Electron phonon coupling effect on wakefields in piezoelectric semiconductors

2003 ◽  
Vol 36 (8) ◽  
pp. 958-960 ◽  
Author(s):  
M Salimullah ◽  
P K Shukla ◽  
S K Ghosh ◽  
H Nitta ◽  
Y Hayashi
Keyword(s):  
Coupling Effect ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Piezoelectric Semiconductors

Structure and properties of gas-dynamic coatings and evaluation of their use in sliding friction pairs

2020 ◽  
pp. 260-266
Author(s):  
V.E. Arkhipov ◽  
T.I. Murav’eva ◽  
M.S. Pugachev ◽  
O.O. Shcherbakova
Keyword(s):  
Aluminum Oxide ◽  
Sliding Friction ◽  
Metal Layer ◽  
Structural Phase ◽  
Mechanical Mixture ◽  
Structural Factors ◽  
Coating Structure ◽  
Corundum Structure ◽  
Deposited Metal ◽  
Copper Zinc

The problems of changes in the coating structure depending on the composition of the sprayed mechanical mixture using copper particles and mixture of copper and zinc particles (" brass") and the effect of structural factors on the tribological properties of the deposited metal layer are considered. The results of X-ray structural, phase, chemical and durometric analyzes, as well as tribological testing of coatings are presented. It is found that structure with hardness of ≈102.7 HV is formed in the coating from mechanical mixture of particles of copper and aluminum oxide (corundum). Numerous pores are observed in the structure of the deposited metal layer, the main size of which does not exceed 2 μm. In the coating from mechanical mixture of particles copper, zinc and aluminum oxide (corundum), structure is formed based on copper with hardness of ≈106.5 HV, zinc — ≈49.7 HV, intermetallic compounds (γ- and ε-phases) — ≈168.7 HV, the mass fraction of which is 62.0, 7.9 and 24.2 %, respectively. Both coatings can be used in sliding friction pairs.

Observation of Core Phonon in Electron–Phonon Coupling in Au25 Nanoclusters

2021 ◽  
Vol 12 (6) ◽  
pp. 1690-1695
Author(s):  
Zhongyu Liu ◽  
Yingwei Li ◽  
Wonyong Shin ◽  
Rongchao Jin
Keyword(s):  
Phonon Coupling ◽  
Electron Phonon Coupling
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