Local Energy Gap Opening Induced by Hemin Dimerization in Aqueous Solution

2015 ◽  
Vol 119 (7) ◽  
pp. 3058-3062 ◽  
Author(s):  
Ronny Golnak ◽  
Jie Xiao ◽  
Kaan Atak ◽  
Munirah Khan ◽  
Edlira Suljoti ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Energy Gap ◽  
Local Energy ◽  
Gap Opening

Energy gap opening by crossing drop cast single-layer graphene nanoribbons

2018 ◽  
Vol 29 (31) ◽  
pp. 315705 ◽  
Author(s):  
Toyo Kazu Yamada ◽  
Hideto Fukuda ◽  
Taizo Fujiwara ◽  
Polin Liu ◽  
Kohji Nakamura ◽  
...  
Keyword(s):  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Gap Opening

scholarly journals Analysis of energy gap opening in graphene oxide

2014 ◽  
Vol 526 ◽  
pp. 012003 ◽  
Author(s):  
Mark Lundie ◽  
Željko Šljivančanin ◽  
Stanko Tomić
Keyword(s):  
Graphene Oxide ◽  
Energy Gap ◽  
Gap Opening

scholarly journals Evidence for a vestigial nematic state in the cuprate pseudogap phase

2019 ◽  
Vol 116 (27) ◽  
pp. 13249-13254 ◽  
Author(s):  
Sourin Mukhopadhyay ◽  
Rahul Sharma ◽  
Chung Koo Kim ◽  
Stephen D. Edkins ◽  
Mohammad H. Hamidian ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Energy Gap ◽  
Density Wave ◽  
Broken Symmetry ◽  
Hole Doping ◽  
Thermal Transitions ◽  
Electronic Density ◽  
Pseudogap Phase ◽  
Nematic State ◽  
Gap Opening

The CuO2 antiferromagnetic insulator is transformed by hole-doping into an exotic quantum fluid usually referred to as the pseudogap (PG) phase. Its defining characteristic is a strong suppression of the electronic density-of-states D(E) for energies |E| < Δ*, where Δ* is the PG energy. Unanticipated broken-symmetry phases have been detected by a wide variety of techniques in the PG regime, most significantly a finite-Q density-wave (DW) state and a Q = 0 nematic (NE) state. Sublattice-phase-resolved imaging of electronic structure allows the doping and energy dependence of these distinct broken-symmetry states to be visualized simultaneously. Using this approach, we show that even though their reported ordering temperatures TDW and TNE are unrelated to each other, both the DW and NE states always exhibit their maximum spectral intensity at the same energy, and using independent measurements that this is the PG energy Δ*. Moreover, no new energy-gap opening coincides with the appearance of the DW state (which should theoretically open an energy gap on the Fermi surface), while the observed PG opening coincides with the appearance of the NE state (which should theoretically be incapable of opening a Fermi-surface gap). We demonstrate how this perplexing phenomenology of thermal transitions and energy-gap opening at the breaking of two highly distinct symmetries may be understood as the natural consequence of a vestigial nematic state within the pseudogap phase of Bi2Sr2CaCu2O8.

SPATIAL EVOLUTION OF THE BACKGROUND CONDUCTANCE IN THE TUNNELING SPECTRA IN Bi2Sr2-xLaxCuO6+δ

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3190-3193
Author(s):  
T. KATO ◽  
T. MACHIDA ◽  
Y. KAMIJO ◽  
K. HARADA ◽  
R. SAITO ◽  
...  
Keyword(s):  
Low Temperature ◽  
Single Crystal ◽  
Spatial Variation ◽  
Energy Gap ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Spatial Evolution ◽  
Local Energy ◽  
Temperature Scanning

The spatial evolution of the background conductance in the tunneling spectra was investigated with low-temperature scanning tunneling spectroscopy on a slightly overdoped Bi 2 Sr 1.74 La 0.26 CuO 6+δ single crystal at 4.2 K. The asymmetry in the background conductance between positive and negative biases strongly correlates with the local energy gap, which shows the inhomogeneous spatial variation: the tunneling spectra become more asymmetric in the regions where the spectra exhibit larger gap value.

scholarly journals Energy-gap opening and quenching in graphene under periodic external potentials

2010 ◽  
Vol 133 (22) ◽  
pp. 224705 ◽  
Author(s):  
Aihua Zhang ◽  
Zhenxiang Dai ◽  
Lei Shi ◽  
Yuan Ping Feng ◽  
Chun Zhang
Keyword(s):  
Energy Gap ◽  
Gap Opening

The effects of the magnetopolaron on the energy gap opening in graphene

2012 ◽  
Vol 24 (13) ◽  
pp. 135301 ◽  
Author(s):  
Wei-Ping Li ◽  
Zi-Wu Wang ◽  
Ji-Wen Yin ◽  
Yi-Fu Yu
Keyword(s):  
Energy Gap ◽  
Gap Opening

scholarly journals Graphene-Based TiO2 Nanocomposite for Photocatalytic Degradation of Dyes in Aqueous Solution under Solar-Like Radiation

2021 ◽  
Vol 11 (9) ◽  
pp. 3966
Author(s):  
Martina Kocijan ◽  
Lidija Ćurković ◽  
Davor Ljubas ◽  
Katarina Mužina ◽  
Ivana Bačić ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Degradation ◽  
Energy Gap ◽  
Visible Region ◽  
Pure Tio2 ◽  
Solar Irradiation ◽  
Degradation Of Dyes ◽  
Visible Part ◽  
Vis Spectroscopy ◽  
Improved Performance

This study presents a novel method for the development of TiO2/reduced graphene oxide (rGO) nanocomposites for photocatalytic degradation of dyes in an aqueous solution. The synergistic integration of rGO and TiO2, through the formation of Ti–O–C bonds, offers an interesting opportunity to design photocatalyst nanocomposite materials with the maximum absorption shift to the visible region of the spectra, where photodegradation can be activated not only with UV but also with the visible part of natural solar irradiation. TiO2@rGO nanocomposites with different content of rGO have been self-assembled by the hydrothermal method followed by calcination treatment. The morphological and structural analysis of the synthesized photocatalysts was performed by FTIR, XRD, XPS, UV-Vis DRS, SEM/EDX, and Raman spectroscopy. The effectiveness of the synthesized nanocomposites as photocatalysts was examined through the photodegradation of methylene blue (MB) and rhodamine B (RhB) dye under artificial solar-like radiation. The influence of rGO concentration (5 and 15 wt.%) on TiO2 performance for photodegradation of the different dyes was monitored by UV-Vis spectroscopy. The obtained results showed that the synthesized TiO2@rGO nanocomposites significantly increased the decomposition of RhB and MB compared to the synthesized TiO2 photocatalyst. Furthermore, TiO2@rGO nanocomposite with high contents of rGO (15 wt.%) presented an improved performance in photodegradation of MB (98.1%) and RhB (99.8%) after 120 min of exposition to solar-like radiation. These results could be mainly attributed to the decrease of the bandgap of synthesized TiO2@rGO nanocomposites with the increased contents of rGO. Energy gap (Eg) values of nanocomposites are 2.71 eV and 3.03 eV, when pure TiO2 particles have 3.15 eV. These results show the potential of graphene-based TiO2 nanocomposite to be explored as a highly efficient solar light-driven photocatalyst for water purification.

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