scholarly journals Parallel Nanoimprint Forming of One-Dimensional Chiral Semiconductor for Strain-Engineered Optical Properties

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yixiu Wang ◽  
Shengyu Jin ◽  
Qingxiao Wang ◽  
Min Wu ◽  
Shukai Yao ◽  
...  
Keyword(s):  
Optical Properties ◽  
Flexible Electronics ◽  
Large Scale ◽  
Materials Science ◽  
Wearable Sensors ◽  
Strain Engineering ◽  
Nanowire Diameter ◽  
One Dimensional ◽  
Superior Mechanical Properties ◽  
Low Dimensional

AbstractThe low-dimensional, highly anisotropic geometries, and superior mechanical properties of one-dimensional (1D) nanomaterials allow the exquisite strain engineering with a broad tunability inaccessible to bulk or thin-film materials. Such capability enables unprecedented possibilities for probing intriguing physics and materials science in the 1D limit. Among the techniques for introducing controlled strains in 1D materials, nanoimprinting with embossed substrates attracts increased attention due to its capability to parallelly form nanomaterials into wrinkled structures with controlled periodicities, amplitudes, orientations at large scale with nanoscale resolutions. Here, we systematically investigated the strain-engineered anisotropic optical properties in Te nanowires through introducing a controlled strain field using a resist-free thermally assisted nanoimprinting process. The magnitude of induced strains can be tuned by adjusting the imprinting pressure, the nanowire diameter, and the patterns on the substrates. The observed Raman spectra from the chiral-chain lattice of 1D Te reveal the strong lattice vibration response under the strain. Our results suggest the potential of 1D Te as a promising candidate for flexible electronics, deformable optoelectronics, and wearable sensors. The experimental platform can also enable the exquisite mechanical control in other nanomaterials using substrate-induced, on-demand, and controlled strains.

Large-scale facile-synthesis and bistable emissions of one-dimensional organic-inorganic C4H14N2PbBr4 metal halide crystals with bipolaronic states

2021 ◽  
Author(s):  
hui peng ◽  
ye tian ◽  
xinxin wang ◽  
shangfei yao ◽  
tao huang ◽  
...  
Keyword(s):  
Physical Properties ◽  
Mechanochemical Synthesis ◽  
Potential Application ◽  
Large Scale ◽  
Metal Halide ◽  
Metal Halides ◽  
Facile Synthesis ◽  
One Dimensional ◽  
Low Dimensional

Low-dimensional metal halides have attracted much attention because of its excellent physical properties and potential application in optoelectronic field. Herein, we developed a novel facile method based on mechanochemical synthesis...

Preparation, Structure and Optical Properties of [CH3SC(NH2)2]3SnI5, [CH3SC(NH2)2][HSC(NH2)2]SnBr4, (CH3C5H4NCH3)PbBr3, and [C6H5CH2SC(NH2)2]4Pb3I10

2002 ◽  
Vol 57 (6) ◽  
pp. 645-650 ◽  
Author(s):  
C. P. Raptopoulou ◽  
A. Terzis ◽  
G. A. Mousdis ◽  
G. C. Papavassiliou
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Blue Shift ◽  
Two Dimensional ◽  
Optical Absorption Spectra ◽  
Absorption Bands ◽  
One Dimensional ◽  
Excitonic Absorption ◽  
Low Dimensional ◽  
Inorganic Network

AbstractThe preparation, crystal structure and optical absorption spectra of [CH3SC(NH2)2]3SnI5 (1), [CH3SC(NH2)2][HSC(NH2)2]SnBr4 (2), (CH3C5H4NCH3)PbBr3 (3), and [C6H5CH2SC-(NH2)2]4Pb3I10 (4) are reported. The compounds 1, 2, 3 consist of MX6-octahedra (M = Sn, Pb, X = I, Br) forming one-dimensional single chains (compounds 1, 3) or double chains (compound 2). The compound 4 forms a two-dimensional inorganic network via corner sharing of three face sharing octahedral units. Because of their low-dimensional character, a blue shift of the excitonic absorption bands, in comparison to those of higher dimensionality systems, is observed.

Anisotropic optical properties of large-scale aligned silver nanowire films via controlled coffee ring effects

RSC Advances ◽  
2015 ◽  
Vol 5 (49) ◽  
pp. 39103-39109 ◽  
Author(s):  
Weiping Zhou ◽  
Anming Hu ◽  
Shi Bai ◽  
Ying Ma ◽  
Denzel Bridges
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Physical Properties ◽  
High Performance ◽  
Large Scale ◽  
Silver Nanowire ◽  
Electromechanical Systems ◽  
One Dimensional ◽  
Coffee Ring ◽  
One Dimensional Nanostructures

Preparation of thin films with one-dimensional nanostructures and unique physical properties for high-performance electronic, optoelectronic, and electromechanical systems.

scholarly journals Introduction to Heterostructured Materials: A Fast Emerging Field

2021 ◽  
Author(s):  
Yuntian Zhu
Keyword(s):  
Large Scale ◽  
Materials Science ◽  
Low Cost ◽  
Back Stress ◽  
Industrial Facilities ◽  
Electric Cars ◽  
Aerospace Applications ◽  
Fast Development ◽  
Superior Mechanical Properties ◽  
Collaborative Efforts

AbstractStrong and tough materials are desired for lightweight, energy efficient applications such as electric cars and aerospace applications. Recently, heterostructures are found to produce unprecedented strength and ductility that are considered impossible based on the materials science in our textbooks. Such superior mechanical properties are enabled by a new scientific principle: hetero-deformation-induced (HDI) strengthening and work hardening. Heterostructured (HS) materials consist of heterogeneous zones with dramatic difference (> 100 pct) in flow stresses. The inter-zone interaction produces back stress in the soft zones and forward stress in the hard zones, which collectively produces the HDI stress. HS materials possess a significant synergistic effect where the integrated property exceeds the prediction by the rule of mixtures. Importantly, HS materials can be produced by current industrial facilities at large scale and low cost. The new materials sciences and promising applications are driving the fast development of the HS materials as an emerging field. There are many fundamental issues that need to be probed so as to effectively design HS materials for superior properties. To solve these issues, it requires collaborative efforts by the communities of experimental materials science and computational material science and mechanics.

scholarly journals Tailoring electronic properties of 2D crystals by strain engineering

2014 ◽  
Vol 70 (a1) ◽  
pp. C192-C192
Author(s):  
Vitor Pereira
Keyword(s):  
Optical Properties ◽  
Electronic Properties ◽  
Materials Science ◽  
Atomic Orbital ◽  
Local Strain ◽  
Science Research ◽  
Strain Engineering ◽  
Nanoscale Transport ◽  
Novel Device ◽  
2D Crystals

One of the enticing features common to most of the two-dimensional electronic systems that, in the wake of (and in parallel with) graphene, are currently at the forefront of materials science research is the ability to easily introduce a combination of planar deformations and bending in the system. Since the electronic properties are ultimately determined by the details of atomic orbital overlap, such mechanical manipulations translate into modified (or, at least, perturbed) electronic properties. Graphene, in particular, on account of its exceptional range of elastic deformation, complemented by an unusual electron-phonon coupling that can be captured by the concept of a fictitious or pseudo-magnetic field (PMF), has taught us that its intrinsic electronic properties can be molded by many more, and much richer, approaches that can be applied to 3D bulk solids. The ability to manipulate the local strain distribution in graphene opens the enticing prospect of strain-engineering its electronic and optical properties, as well as of enhancing interaction and correlation effects. I will describe some examples of how strain-engineered graphene can have richer spectral, transport, and optical properties, or how it allows potentially novel device functionalities and tunability. Some concepts will be discussed in parallel with a summary of selected experimental work. A general optimization framework for tailoring physical properties of 2D crystals by manipulating the state of local strain, and allowing a one-step route from their design to experimental implementation, will be presented, together with a discussion of examples of its application in the design of nanoscale transport devices.

scholarly journals Flexoelectric and Piezoelectric Coupling in a Bended MoS2 Monolayer

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2086
Author(s):  
Hanna V. Shevliakova ◽  
Semen O. Yesylevskyy ◽  
Ihor Kupchak ◽  
Galina I. Dovbeshko ◽  
Yunseok Kim ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Strain Gradient ◽  
Density Functional ◽  
Transition Metal Dichalcogenides ◽  
Strain Engineering ◽  
Mos2 Monolayer ◽  
Shear Component ◽  
Order Of Magnitude ◽  
Metal Dichalcogenides ◽  
Low Dimensional

Low-dimensional (LD) transition metal dichalcogenides (TMDs) in the form of nanoflakes, which consist of one or several layers, are the subject of intensive fundamental and applied research. The tuning of the electronic properties of the LD-TMDs are commonly related with applied strains and strain gradients, which can strongly affect their polar properties via piezoelectric and flexoelectric couplings. Using the density functional theory and phenomenological Landau approach, we studied the bended 2H-MoS2 monolayer and analyzed its flexoelectric and piezoelectric properties. The dependences of the dipole moment, strain, and strain gradient on the coordinate along the layer were calculated. From these dependences, the components of the flexoelectric and piezoelectric tensors have been determined and analyzed. Our results revealed that the contribution of the flexoelectric effect dominates over the piezoelectric effect in both in-plane and out-of-plane directions of the monolayer. In accordance with our calculations, a realistic strain gradient of about 1 nm−1 can induce an order of magnitude higher than the flexoelectric response in comparison with the piezoelectric reaction. The value of the dilatational flexoelectric coefficient is almost two times smaller than the shear component. It appeared that the components of effective flexoelectric and piezoelectric couplings can be described by parabolic dependences of the corrugation. Obtained results are useful for applications of LD-TMDs in strain engineering and flexible electronics.

Evolution of Metastable Structures in Bimetallic Catalysts from Microscopy and Machine-Learning Molecular Dynamics

2020 ◽  
Author(s):  
Jin Soo Lim ◽  
Jonathan Vandermause ◽  
Matthijs A. van Spronsen ◽  
Albert Musaelian ◽  
Christopher R. O’Connor ◽  
...  
Keyword(s):  
Machine Learning ◽  
Molecular Dynamics ◽  
Large Scale ◽  
Materials Science ◽  
Complete Characterization ◽  
Layer By Layer ◽  
Surface Restructuring ◽  
Metastable Structures ◽  
Mechanistic Investigation ◽  
Underlying Mechanisms

Restructuring of interface plays a crucial role in materials science and heterogeneous catalysis. Bimetallic systems, in particular, often adopt very different composition and morphology at surfaces compared to the bulk. For the first time, we reveal a detailed atomistic picture of the long-timescale restructuring of Pd deposited on Ag, using microscopy, spectroscopy, and novel simulation methods. Encapsulation of Pd by Ag always precedes layer-by-layer dissolution of Pd, resulting in significant Ag migration out of the surface and extensive vacancy pits. These metastable structures are of vital catalytic importance, as Ag-encapsulated Pd remains much more accessible to reactants than bulk-dissolved Pd. The underlying mechanisms are uncovered by performing fast and large-scale machine-learning molecular dynamics, followed by our newly developed method for complete characterization of atomic surface restructuring events. Our approach is broadly applicable to other multimetallic systems of interest and enables the previously impractical mechanistic investigation of restructuring dynamics.

scholarly journals Solvent-Controlled Self-Assembled Oligopyrrolic Receptor

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1771
Author(s):  
Fei Wang ◽  
Kejiang Liang ◽  
Mads Christian Larsen ◽  
Steffen Bähring ◽  
Masatoshi Ishida ◽  
...  
Keyword(s):  
Materials Science ◽  
Science Research ◽  
Polymeric Chain ◽  
Supramolecular System ◽  
Receptor System ◽  
One Dimensional ◽  
X Ray ◽  
Host Guest Complex ◽  
Colorimetric Response ◽  
Strong Acids

We report a fully organic pyridine-tetrapyrrolic U-shaped acyclic receptor 10, which prefers a supramolecular pseudo-macrocyclic dimeric structure (10)2 in a less polar, non-coordinating solvent (e.g., CHCl3). Conversely, when it is crystalized from a polar, coordinating solvent (e.g., N,N-dimethylformamide, DMF), it exhibited an infinite supramolecular one-dimensional (1D) “zig-zag” polymeric chain, as inferred from the single-crystal X-ray structures. This supramolecular system acts as a potential receptor for strong acids, e.g., p-toluenesulfonic acid (PTSA), methane sulfonic acid (MSA), H2SO4, HNO3, and HCl, with a prominent colorimetric response from pale yellow to deep red. The receptor can easily be recovered from the organic solution of the host–guest complex by simple aqueous washing. It was observed that relatively stronger acids with pKa < −1.92 in water were able to interact with the receptor, as inferred from 1H NMR titration in tetrahydrofuran-d8 (THF-d8) and ultraviolet–visible (UV–vis) spectroscopic titrations in anhydrous THF at 298 K. Therefore, this new dynamic supramolecular receptor system may have potentiality in materials science research.

Synergistic vacancy defects and mechanical strain for the modulation of the mechanical, electronic and optical properties of monolayer tungsten disulfide

2021 ◽  
Vol 23 (10) ◽  
pp. 6298-6308
Author(s):  
Chan Gao ◽  
Xiaoyong Yang ◽  
Ming Jiang ◽  
Lixin Chen ◽  
Zhiwen Chen ◽  
...  
Keyword(s):  
Optical Properties ◽  
Transition Metal ◽  
Mechanical Strain ◽  
Transition Metal Dichalcogenides ◽  
Strain Engineering ◽  
Tungsten Disulfide ◽  
Defect Engineering ◽  
Vacancy Defects ◽  
Electronic And Optical Properties ◽  
Metal Dichalcogenides

The combination of defect engineering and strain engineering for the modulation of the mechanical, electronic and optical properties of monolayer transition metal dichalcogenides (TMDs).

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