scholarly journals Frontiers in Optics Washington Sept 2019 BiOBr JTu4A.37

2020 ◽  
Author(s):  
David Moss
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
Metal Dichalcogenides

We observe extremely high two photon absorption (TPA) of BiOBr nanoflakes using the Z-scan technique. We report a TPA coefficient as high as ~ 6.697 × 10-7 m/W – more than an order of magnitude larger than that of other 2D materials such as graphene and transition metal dichalcogenides.

Saturation of Two-Photon Absorption in Layered Transition Metal Dichalcogenides: Experiment and Theory

ACS Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 1558-1565 ◽  
Author(s):  
Ningning Dong ◽  
Yuanxin Li ◽  
Saifeng Zhang ◽  
Niall McEvoy ◽  
Riley Gatensby ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

scholarly journals Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

2021 ◽  
Vol 3 (1) ◽  
pp. 272-278
Author(s):  
Pilar G. Vianna ◽  
Aline dos S. Almeida ◽  
Rodrigo M. Gerosa ◽  
Dario A. Bahamon ◽  
Christiano J. S. de Matos
Keyword(s):  
Dielectric Constant ◽  
Transition Metal ◽  
Harmonic Generation ◽  
Nonlinear Effect ◽  
Second Harmonic ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Metal Dichalcogenides ◽  
Epsilon Near Zero

The scheme illustrates a monolayer transition-metal dichalcogenide on an epsilon-near-zero substrate. The substrate near-zero dielectric constant is used as the enhancement mechanism to maximize the SHG nonlinear effect on monolayer 2D materials.

Combined Healing and Doping of Transition Metal Dichalcogenides Through Molecular Functionalization

2021 ◽  
Author(s):  
Sai Manoj Gali ◽  
David Beljonne
Keyword(s):  
Transition Metal ◽  
Charge Transport ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides

Transition Metal Dichalcogenides (TMDCs) are emerging as promising two-dimensional (2D) materials. Yet, TMDCs are prone to inherent defects such as chalcogen vacancies, which are detrimental to charge transport. Passivation of...

scholarly journals Synthesis and characterisation of thin-film platinum disulfide and platinum sulfide

Nanoscale ◽  
2021 ◽  
Author(s):  
Conor Patrick Cullen ◽  
Cormac Ó Coileáin ◽  
John B McManus ◽  
Oliver Hartwig ◽  
David McCloskey ◽  
...  
Keyword(s):  
Thin Film ◽  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides ◽  
Group 10

Group-10 transition metal dichalcogenides (TMDs) are rising in prominence within the highly innovative field of 2D materials. While PtS2 has been investigated for potential electronic applications, due to its high...

scholarly journals 2D Materials: Re Doping in 2D Transition Metal Dichalcogenides as a New Route to Tailor Structural Phases and Induced Magnetism (Adv. Mater. 43/2017)

2017 ◽  
Vol 29 (43) ◽  
Author(s):  
Vidya Kochat ◽  
Amey Apte ◽  
Jordan A. Hachtel ◽  
Hiroyuki Kumazoe ◽  
Aravind Krishnamoorthy ◽  
...  
Keyword(s):  
Transition Metal ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides

Theoretical studies on the one- and two-photon absorption of tetrabenzoporphyrins and phthalocyanines

2004 ◽  
Vol 82 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Xin Zhou ◽  
Ai-Min Ren ◽  
Ji-Kang Feng ◽  
Xiao-Juan Liu
Keyword(s):  
Dipole Moment ◽  
Cross Sections ◽  
Density Functional ◽  
Transition Dipole Moment ◽  
Photon Absorption ◽  
Transition Dipole ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Order Of Magnitude ◽  
The One

The one-photon absorption (OPA) properties of tetrabenzoporphyrins (TBPs) and phthalocyanines (Pcs) were studied using the semiempirical ZINDO method and time-dependent density functional theory (TDDFT), respectively. The compared results confirmed that the semiempirical ZINDO method was reasonably reliable when calculating the OPA of tetrabenzoporphyrins and phthalocyanines. On the basis of the OPA properties obtained from the ZINDO method, two-photon absorption (TPA) properties of two series of molecules were investigated, using ZINDO and sum-over-states (SOS) methods. The results showed that the TPA cross-sections of all molecules were in the range of 220.6 × 10–50 – 345.9 × 10–50 cm4·s·photon–1, which were in the same order of magnitude as the values reported in the literature. The relatively larger δ(ω) value for Pcs with respect to that for corresponding TBPs originates from larger intramolecular charge transfer, which can be characterized by the difference of dipole moment between S0 and S1 and the transition dipole moment between S1 and S5.Key words: two-photon absorption, ZINDO, sum-over-states, tetrabenzoporphyrin, phthalocyanines.

scholarly journals Waterproof molecular monolayers stabilize 2D materials

2019 ◽  
Vol 116 (42) ◽  
pp. 20844-20849 ◽  
Author(s):  
Cong Su ◽  
Zongyou Yin ◽  
Qing-Bo Yan ◽  
Zegao Wang ◽  
Hongtao Lin ◽  
...  
Keyword(s):  
Transition Metal ◽  
Theoretical Analysis ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Water Molecules ◽  
Two Dimensional ◽  
Ambient Conditions ◽  
Molecular Monolayers ◽  
Metal Dichalcogenides ◽  
Van Der Waals Materials

Two-dimensional van der Waals materials have rich and unique functional properties, but many are susceptible to corrosion under ambient conditions. Here we show that linear alkylamines n-CmH2m+1NH2, with m = 4 through 11, are highly effective in protecting the optoelectronic properties of these materials, such as black phosphorus (BP) and transition-metal dichalcogenides (TMDs: WS2, 1T′-MoTe2, WTe2, WSe2, TaS2, and NbSe2). As a representative example, n-hexylamine (m = 6) can be applied in the form of thin molecular monolayers on BP flakes with less than 2-nm thickness and can prolong BP’s lifetime from a few hours to several weeks and even months in ambient environments. Characterizations combined with our theoretical analysis show that the thin monolayers selectively sift out water molecules, forming a drying layer to achieve the passivation of the protected 2D materials. The monolayer coating is also stable in air, H2 annealing, and organic solvents, but can be removed by certain organic acids.

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