Optoelectronic Properties of Atomically Thin MoxW(1-x)S2 Nanoflakes Probed by Spatially-Resolved Monochromated EELS

Band gap engineering of atomically thin two-dimensional (2D) materials has attracted a huge amount of interest as a key aspect to the application of these materials in nanooptoelectronics and nanophotonics. Low-loss electron energy loss spectroscopy has been employed to perform a direct measurement of the band gap in atomically thin MoxW(1−x)S2 nanoflakes. The results show a bowing effect with the alloying degree, which fits previous studies focused on excitonic transitions. Additional properties regarding the Van Hove singularities in the density of states of these materials, as well as high energy excitonic transition, have been analysed as well.

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Large-area synthesis of monolayered MoS2(1−x)Se2x with a tunable band gap and its enhanced electrochemical catalytic activity

Nanoscale ◽

10.1039/c5nr02652k ◽

2015 ◽

Vol 7 (23) ◽

pp. 10490-10497 ◽

Cited By ~ 91

Author(s):

Lei Yang ◽

Qi Fu ◽

Wenhui Wang ◽

Jian Huang ◽

Jianliu Huang ◽

...

Keyword(s):

Band Gap ◽

2D Materials ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Two Dimensional ◽

Large Area ◽

Band Gap Engineering ◽

Physical And Chemical ◽

Tunable Band Gap ◽

And Chemical Properties

“Band gap engineering” in two-dimensional (2D) materials plays an important role in tailoring their physical and chemical properties.

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POSSIBILITIES OF BAND GAP ENGINEERING IN TWO-DIMENSIONAL HEXAGONAL DICHALCOGENIDES

Physics, Chemistry and Applications of Nanostructures ◽

10.1142/9789814696524_0041 ◽

2015 ◽

pp. 161-168 ◽

Cited By ~ 1

Author(s):

A. V. KRIVOSHEEVA

Keyword(s):

Band Gap ◽

Two Dimensional ◽

Band Gap Engineering

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Effects of Fast Secondary Electrons on Spatiallyresolved Low-Loss Eels of Polystyrene

Microscopy and Microanalysis ◽

10.1017/s1431927600024144 ◽

1998 ◽

Vol 4 (S2) ◽

pp. 804-805

Author(s):

K. Siangchaew ◽

M. Libera

Keyword(s):

Electron Irradiation ◽

Phenyl Ring ◽

Cross Link ◽

Low Loss ◽

Secondary Electrons ◽

Positive Photoresist ◽

Spatially Resolved ◽

Probe Size ◽

Spectroscopic Information ◽

Electron Energy Loss

A good understanding of the effect of electron irradiation on polymers is necessary in order to optimally utilize the spectroscopic information and resolution of spatially-resolved electron energy-loss spectroscopy (EELS). This investigation studies the effect of electron irradiation on the low-loss spectroscopic signal and spatial resolution obtainable from polystyrene (PS) homopolymer. Because of the conjugated valence electron distribution associated with its pendant phenyl ring, polystyrene is relatively stable under electron irradiation and has well characterized spectroscopic fingerprints including a notable π—π* transition circa 7eV (1). In addition, polystyrene is used as a positive photoresist because it can cross-link effectively when exposed to an electron irradiation (2).The critical dose characterizing degradation of aromatic polymers is of the order 1-10 C/cm2 (3). In practice, the dose delivered to a specimen is determined both by electron probe size and probe current.

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Photonic band gap engineering in two-dimensional photonic crystals and iso-frequency contours

Journal of Electromagnetic Waves and Applications ◽

10.1080/09205071.2013.864247 ◽

2013 ◽

Vol 28 (2) ◽

pp. 253-263 ◽

Cited By ~ 3

Author(s):

U. Erdiven ◽

F. Karadag ◽

M. Karaaslan ◽

E. Unal ◽

F. Dincer ◽

...

Keyword(s):

Photonic Crystals ◽

Band Gap ◽

Photonic Band Gap ◽

Two Dimensional ◽

Band Gap Engineering ◽

Photonic Band

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Optical absorbance and band-gap engineering of (BN)1−x(C2)x two-dimensional alloys: Phase separation and composition fluctuation effects

Physical Review B ◽

10.1103/physrevb.95.035407 ◽

2017 ◽

Vol 95 (3) ◽

Cited By ~ 13

Author(s):

I. Guilhon ◽

M. Marques ◽

L. K. Teles ◽

F. Bechstedt

Keyword(s):

Phase Separation ◽

Band Gap ◽

Two Dimensional ◽

Band Gap Engineering ◽

Optical Absorbance ◽

Composition Fluctuation ◽

Fluctuation Effects

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Band-gap engineering in two-dimensional periodic photonic crystals

Journal of Applied Physics ◽

10.1063/1.1288229 ◽

2000 ◽

Vol 88 (5) ◽

pp. 2877-2884 ◽

Cited By ~ 17

Author(s):

M. S. Kushwaha ◽

B. Djafari-Rouhani

Keyword(s):

Photonic Crystals ◽

Band Gap ◽

Two Dimensional ◽

Band Gap Engineering

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Exploring the electronic band gap of Janus MoSeO and WSeO monolayers and their heterostructures

New Journal of Chemistry ◽

10.1039/d1nj04427c ◽

2021 ◽

Author(s):

On Vo Van ◽

Khanh Nguyen Duy ◽

Jonathan Sanchez Guerrero ◽

Hoat Do Minh

Keyword(s):

Symmetry Breaking ◽

Band Gap ◽

2D Materials ◽

Two Dimensional ◽

Plane Symmetry ◽

Electronic Band ◽

Out Of Plane ◽

Electronic Band Gap

Designing new two-dimensional (2D) materials based on Janus structure has drawn great attention due to their novel prop erties induced by the out-of-plane symmetry breaking. In this work, we have...

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Borophene-graphene heterostructures

Science Advances ◽

10.1126/sciadv.aax6444 ◽

2019 ◽

Vol 5 (10) ◽

pp. eaax6444 ◽

Cited By ~ 13

Author(s):

Xiaolong Liu ◽

Mark C. Hersam

Keyword(s):

Vertical Integration ◽

2D Materials ◽

Two Dimensional ◽

Promising Candidate ◽

Diverse Range ◽

Spectroscopic Measurements ◽

Synthesis Conditions ◽

Spatially Resolved ◽

The Rich ◽

Its Polymorphism

Integration of dissimilar two-dimensional (2D) materials is essential for nanoelectronic applications. Compared to vertical stacking, covalent lateral stitching requires bottom-up synthesis, resulting in rare realizations of 2D lateral heterostructures. Because of its polymorphism and diverse bonding geometries, borophene is a promising candidate for 2D heterostructures, although suitable synthesis conditions have not yet been demonstrated. Here, we report lateral and vertical integration of borophene with graphene. Topographic and spatially resolved spectroscopic measurements reveal nearly atomically sharp lateral interfaces despite imperfect crystallographic lattice and symmetry matching. In addition, boron intercalation under graphene results in rotationally commensurate vertical heterostructures. The rich bonding configurations of boron suggest that borophene can be integrated into a diverse range of 2D heterostructures.

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Interaction of Pyrene Ligands with Neat and Defective Two Dimensional ZnO: A First Principles Study

MRS Advances ◽

10.1557/adv.2017.548 ◽

2017 ◽

Vol 2 (49) ◽

pp. 2799-2805

Author(s):

Velappa Jayaraman Surya ◽

Yuvaraj Sivalingam ◽

Velappa Jayaraman Sowmya ◽

Palani Elumalai ◽

Gabriele Magna ◽

...

Keyword(s):

Zinc Oxide ◽

Band Gap ◽

Research Group ◽

First Principles ◽

2D Materials ◽

Zno Nanorods ◽

Two Dimensional ◽

First Principles Calculations ◽

Comb Structure ◽

Finite Band

ABSTRACTMany heterogeneous and flat two dimensional (2D) materials with finite band gap have been researched for its suitability in exotic applications. For instance, zinc oxide (ZnO) with honey comb structure has optimum band gap that makes it eligible for opto-electronic applications. Recently, our research group have found that pyrene based tetratopic ligands (PTL) are suitable for functionalizing ZnO nanorods. In this study, neat and defective 2D ZnO layer is functionalized with different pyrene based ligands with various functional groups. First principles calculations are done and the degree of affinity of pyrene ligands towards neat and defective ZnO sheets is compared.

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