Electron-Selective TiO2 /CVD-Graphene Layers for Photocorrosion Inhibition in Cu2 O Photocathodes

2017 ◽  
Vol 4 (17) ◽  
pp. 1700271 ◽  
Author(s):  
Chandan Das ◽  
Balakrishna Ananthoju ◽  
Arpan Kumar Dhara ◽  
Mohammed Aslam ◽  
Shaibal K. Sarkar ◽  
...  
Keyword(s):  
Cvd Graphene ◽  
Graphene Layers ◽  
Photocorrosion Inhibition

Double-layer CVD graphene as stretchable transparent electrodes

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 6057-6064 ◽  
Author(s):  
Sejeong Won ◽  
Yun Hwangbo ◽  
Seoung-Ki Lee ◽  
Kyung-Shik Kim ◽  
Kwang-Seop Kim ◽  
...  
Keyword(s):  
Double Layer ◽  
Strain Relaxation ◽  
Transparent Electrodes ◽  
Cvd Graphene ◽  
Graphene Layers

DLG has a superior electromechanical stretchability compared to SLG owing to strain relaxationviasliding of graphene layers over one another.

scholarly journals Fluorophore and protein conjugated Diels-Alder functionalized CVD graphene layers

2016 ◽  
Vol 6 (10) ◽  
pp. 3242 ◽  
Author(s):  
Huai-Ning Chang ◽  
Santanu Sarkar ◽  
James R. Baker ◽  
Theodore B. Norris
Keyword(s):  
Diels Alder ◽  
Cvd Graphene ◽  
Graphene Layers

scholarly journals Strain Gauges Based on CVD Graphene Layers and Exfoliated Graphene Nanoplatelets with Enhanced Reproducibility and Scalability for Large Quantities

Sensors ◽  
2017 ◽  
Vol 17 (12) ◽  
pp. 2937 ◽  
Author(s):  
Volkan Yokaribas ◽  
Stefan Wagner ◽  
Daniel Schneider ◽  
Philipp Friebertshäuser ◽  
Max Lemme ◽  
...  
Keyword(s):  
Graphene Nanoplatelets ◽  
Strain Gauges ◽  
Cvd Graphene ◽  
Graphene Layers ◽  
Exfoliated Graphene

scholarly journals Effect of cobalt particle deposition on quantum corrections to Drude conductivity in twisted CVD graphene

2019 ◽  
Vol 5 (4) ◽  
pp. 165-173
Author(s):  
Alexander K. Fedotov ◽  
Sergey L. Prishchepa ◽  
Alexander S. Fedotov ◽  
Vladzislaw E. Gumennik ◽  
Ivan V. Komissarov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Interference ◽  
Particle Deposition ◽  
Carrier Transport ◽  
Ohmic Contacts ◽  
Weak Localization ◽  
Thermal Fluctuations ◽  
Field Range ◽  
Cvd Graphene ◽  
Graphene Layers

Graphene applications in electronics require experimental study of the formation of high-quality Ohmic contacts and deeper understanding of electron transport mechanisms at metal/grapheme contacts. We have studied carrier transport in twisted CVD graphene decorated with electrodeposited Co particles forming Ohmic contacts with graphene layers. We have compared layer resistivity as a function of temperature and magnetic field R�(T, B) for as-synthesized and decorated twisted graphene on silicon oxide substrates. Experiments have proven the existence of negative (induction < 1 Tl) and positive (induction > 1 Tl) contributions to magnetoresistance in both specimen types. The R�(T, B) functions have been analyzed based on the theory of 2D quantum interference corrections to Drude conductivity taking into account competition of hopping conductivity mechanism. We show that for the experimental temperature range (2–300 K) and magnetic field range (up to 8 Tl), carrier transport description in test graphene requires taking into account at least three interference contributions to conductivity, i.e., from weak localization, intervalley scattering and pseudospin chirality, as well as graphene buckling induced by thermal fluctuations.

scholarly journals Towards Perfect Absorption of Single Layer CVD Graphene in an Optical Resonant Cavity: Challenges and Experimental Achievements

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 352
Author(s):  
Abedin Nematpour ◽  
Maria Luisa Grilli ◽  
Laura Lancellotti ◽  
Nicola Lisi
Keyword(s):  
Incident Angle ◽  
Resonant Cavity ◽  
Experimental Studies ◽  
Single Layer ◽  
Absorption Enhancement ◽  
Perfect Absorption ◽  
Cvd Graphene ◽  
Graphene Layers ◽  
Absorption Increase ◽  
Fabry Perot

Graphene is emerging as a promising material for the integration in the most common Si platform, capable to convey some of its unique properties to fabricate novel photonic and optoelectronic devices. For many real functions and devices however, graphene absorption is too low and must be enhanced. Among strategies, the use of an optical resonant cavity was recently proposed, and graphene absorption enhancement was demonstrated, both, by theoretical and experimental studies. This paper summarizes our recent progress in graphene absorption enhancement by means of Si/SiO2-based Fabry–Perot filters fabricated by radiofrequency sputtering. Simulations and experimental achievements carried out during more than two years of investigations are reported here, detailing the technical expedients that were necessary to increase the single layer CVD graphene absorption first to 39% and then up to 84%. Graphene absorption increased when an asymmetric Fabry–Perot filter was applied rather than a symmetric one, and a further absorption increase was obtained when graphene was embedded in a reflective rather than a transmissive Fabry–Perot filter. Moreover, the effect of the incident angle of the electromagnetic radiation and of the polarization of the light was investigated in the case of the optimized reflective Fabry–Perot filter. Experimental challenges and precautions to avoid evaporation or sputtering induced damage on the graphene layers are described as well, disclosing some experimental procedures that may help other researchers to embed graphene inside PVD grown materials with minimal alterations.

Magnetooptics of graphene layers

2012 ◽  
Vol 182 (11) ◽  
pp. 1223-1228 ◽  
Author(s):  
L.A. Falkovsky
Keyword(s):  
Graphene Layers

scholarly journals Manipulating the surface-enhanced Raman spectroscopy (SERS) activity and plasmon-driven catalytic efficiency by the control of Ag NP/graphene layers under optical excitation

Nanophotonics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 1529-1540
Author(s):  
Xianwu Xiu ◽  
Liping Hou ◽  
Jing Yu ◽  
Shouzhen Jiang ◽  
Chonghui Li ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hot Spot ◽  
Catalytic Efficiency ◽  
Surface Enhanced Raman Spectroscopy ◽  
In Situ Monitoring ◽  
Excitation Beam ◽  
Graphene Layers ◽  
Cu Film ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Abstract Highly efficient plasmon-driven catalysis and excellent surface-enhanced Raman spectroscopy (SERS) performance are proportional to the square of the local electromagnetic field (hot spot). However, a proven way to realize the enhancement in intensity and density of “hot spot” still needs to be investigated. Here, we report on multilayered Ag nanoparticle (Ag NP)/graphene coupled to an underlying Cu film system (MAgNP-CuF) which can be used as an effective SERS substrates realizing ultra-sensitive detection for toxic molecules and in situ monitoring the plasmon-driven reaction for p-nitrothiophenol (PNTP) to p,p′-dimercaptobenzene (DMAB) conversion. The mechanism of ultra-sensitive SERS response and catalytic reaction is investigated via Ag NP/graphene layer-dependent experiments combined with theoretical simulations. The research found that the intensity and density of “hot spot” can be effectively manipulated by the number of plasmonic layers, and the bottom Cu film could also reflect the scattered and excitation beam and would further enhance the Raman signals. Moreover, the MAgNP-CuF exhibits outstanding performance in stability and reproducibility. We believe that this concept of multilayered plasmonic structures would be widely used not only in the field of SERS but also in the wider research in photocatalysis.

Abnormal Dielectric Constant of Nanoconfined Water between Graphene Layers in the Presence of Salt

2021 ◽  
Vol 125 (6) ◽  
pp. 1604-1610
Author(s):  
Hossein Jalali ◽  
Erfan Lotfi ◽  
Radha Boya ◽  
Mehdi Neek-Amal
Keyword(s):  
Dielectric Constant ◽  
Graphene Layers ◽  
Nanoconfined Water
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