Journal articles: 'Van der Waal materials'

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Lado, Jose L. "Putting a twist on spintronics." Science 374, no. 6571 (November 26, 2021): 1048–49. http://dx.doi.org/10.1126/science.abm0091.

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Versteegh, Kees. "“A River Runs Through It”: Crossing the Meuse in Batenburg (The Netherlands)." Roczniki Humanistyczne 71, no. 6sp (July 24, 2023): 273–95. http://dx.doi.org/10.18290/rh237106.13s.

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The dialects spoken in the Dutch region Land van Maas en Waal, between the two rivers Meuse and Waal, are usually classified as a mixed dialect group exhibiting characteristics of the dialects of both Brabant and Gelderland. The perceptual map of the dialects paints a different picture as it shows a division between the speakers in the southern part of the region, who regard their dialect as more related to Brabant dialects, while speakers in the northern part feel more connected with the dialects spoken to the north of the Waal. The present paper attempts to explain this difference in perception by looking at the contacts the inhabitants of the small town of Batenburg had across the river. Materials used for this study include interviews with elderly people in Batenburg and data from the municipal archives.

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Jiandong Qiao, Jiandong Qiao, Fuhong Mei Fuhong Mei, and Yu Ye Yu Ye. "Single-photon emitters in van der Waals materials." Chinese Optics Letters 17, no. 2 (2019): 020011. http://dx.doi.org/10.3788/col201917.020011.

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Wang, Xu, and Peter Schiavone. "Green’s functions for an anisotropic half-space and bimaterial incorporating anisotropic surface elasticity and surface van der Waals forces." Mathematics and Mechanics of Solids 22, no. 3 (August 6, 2016): 557–72. http://dx.doi.org/10.1177/1081286515598826.

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In this paper we derive explicit expressions for the Green’s functions in the case of an anisotropic elastic half-space and bimaterial subjected to a line force and a line dislocation. In contrast to previous studies in this area, our analysis includes the contributions of both anisotropic surface elasticity and surface van der Waals interaction forces. By means of the Stroh sextic formalism, analytical continuation and the state-space approach, the corresponding boundary value problem is reduced to a system of six (for a half-space) or 12 (for a bimaterial) coupled first-order differential equations. By employing the orthogonality relations among the corresponding eigenvectors, the coupled system of differential equations is further decoupled to six (for a half-space) or 12 (for a bimaterial) independent first-order differential equations. The latter is solved analytically using exponential integrals. In addition, we identify four and seven non-zero intrinsic material lengths for a half-space and a bimaterial, respectively, due entirely to the incorporation of the surface elasticity and surface van der Waal forces. We prove that these material lengths can be only either real and positive or complex conjugates with positive real parts.

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Han, Xiaodong. "Ductile van der Waals materials." Science 369, no. 6503 (July 30, 2020): 509. http://dx.doi.org/10.1126/science.abd4527.

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Lei, Yuxin, Qiaoling Lin, Sanshui Xiao, Juntao Li, and Hanlin Fang. "Optically Active Telecom Defects in MoTe2 Fewlayers at Room Temperature." Nanomaterials 13, no. 9 (April 27, 2023): 1501. http://dx.doi.org/10.3390/nano13091501.

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The optical and electrical properties of semiconductors are strongly affected by defect states. The defects in molybdenum ditelluride (MoTe2) show the potential for quantum light emission at optical fiber communication bands. However, the observation of defect-related light emission is still limited to cryogenic temperatures. In this work, we demonstrate the deep defect states in MoTe2 fewlayers produced via a standard van der Waal material transfer method with a heating process, which enables light emission in the telecommunication O-band. The optical measurements show evidence of localized excitons and strong interaction among defects. Furthermore, the optical emission of defects depends on the thickness of the host materials. Our findings offer a new route for tailoring the optical properties of two-dimensional materials in optoelectronic applications.

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Ajayan, Pulickel, Philip Kim, and Kaustav Banerjee. "Two-dimensional van der Waals materials." Physics Today 69, no. 9 (September 2016): 38–44. http://dx.doi.org/10.1063/pt.3.3297.

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Basov, D. N., M. M. Fogler, and F. J. Garcia de Abajo. "Polaritons in van der Waals materials." Science 354, no. 6309 (October 13, 2016): aag1992. http://dx.doi.org/10.1126/science.aag1992.

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Nejad, Marjan A., and Herbert M. Urbassek. "Adsorption and Diffusion of Cisplatin Molecules in Nanoporous Materials: A Molecular Dynamics Study." Biomolecules 9, no. 5 (May 27, 2019): 204. http://dx.doi.org/10.3390/biom9050204.

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Using molecular dynamics simulations, the adsorption and diffusion of cisplatin drug molecules in nanopores is investigated for several inorganic materials. Three different materials are studied with widely-varying properties: metallic gold, covalent silicon, and silica. We found a strong influence of both the van der Waals and the electrostatic interaction on the adsorption behavior on the pore walls, which in turn influence the diffusion coefficients. While van der Waals forces generally lead to a reduction of the diffusion coefficient, the fluctuations in the electrostatic energy induced by orientation changes of the cisplatin molecule were found to help desorb the molecule from the wall.

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Jia-lu, ZHENG, DAI Zhi-gao, HU Guang-wei, OU Qing-dong, ZHANG Jin-rui, GAN Xue-tao, QIU Cheng-wei, and BAO Qiao-liang. "Twisted van der Waals materials for photonics." Chinese Optics 14, no. 4 (2021): 812–22. http://dx.doi.org/10.37188/co.2021-0023.

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Joe, Minwoong, Pawan Kumar Srivastava, Budhi Singh, Hyobin Ahn, and Changgu Lee. "Iron-based ferromagnetic van der Waals materials." Journal of Physics D: Applied Physics 54, no. 47 (September 10, 2021): 473002. http://dx.doi.org/10.1088/1361-6463/ac18eb.

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Novoselov, K. S., A. Mishchenko, A. Carvalho, and A. H. Castro Neto. "2D materials and van der Waals heterostructures." Science 353, no. 6298 (July 28, 2016): aac9439. http://dx.doi.org/10.1126/science.aac9439.

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Ly, Thuc Hue, Jiong Zhao, Dong Hoon Keum, Qingming Deng, Zhiyang Yu, and Young Hee Lee. "Hyperdislocations in van der Waals Layered Materials." Nano Letters 16, no. 12 (November 11, 2016): 7807–13. http://dx.doi.org/10.1021/acs.nanolett.6b04002.

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Ma, Weiliang, Babar Shabbir, Qingdong Ou, Yemin Dong, Huanyang Chen, Peining Li, Xinliang Zhang, Yuerui Lu, and Qiaoliang Bao. "Anisotropic polaritons in van der Waals materials." InfoMat 2, no. 5 (April 28, 2020): 777–90. http://dx.doi.org/10.1002/inf2.12119.

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Burnett, Steven S., and James W. Mitchell. "DFT Investigation of the Mechanism and Chemical Kinetics for the Gelation of Colloidal Silica." MRS Proceedings 1547 (2013): 173–82. http://dx.doi.org/10.1557/opl.2013.637.

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ABSTRACTThe mechanism for the gelation reaction of colloidal silica, Si(OH)4 +Si(OH)3 (O)- ----> Si2O8H5- + H2O, by an anionic pathway was investigated using density functional theory(DFT). Using transition state theory, the rate constants were obtained by analyzing the potential energy surface at the reactants, saddle point, and the products. In addition, reaction rate constants were investigated in the presence of ammonium chloride (NH4Cl) and sodium chloride (NaCl). These salts act as catalysts to induce gelation by destabilizing the double layer of colloidal silica to allow for Van der Waal interactions. Furthermore, it was observed that ammonium chloride plays an important role by initiating a hydride transfer allowing the reaction to proceed from the second transition state to the final product.

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Kausar, Ayesha. "Polyaniline and quantum dot-based nanostructures: Developments and perspectives." Journal of Plastic Film & Sheeting 36, no. 4 (May 14, 2020): 430–47. http://dx.doi.org/10.1177/8756087920926649.

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Quantum dots are 2–5 nm nanoparticles with exceptional optical, electronic, luminescence, and semiconducting properties. Polyaniline is an exclusive conjugated polymer. This article reviews recent efforts, scientific trials, and technological solicitations of the polyaniline/quantum dot-based nanocomposites. Polyaniline/quantum dot mixtures form a unique composition for advance materials and applications. Carbon dots, graphene quantum dots, and several inorganic quantum dots have been added to a conducting polymer. A functional quantum dot may develop electrostatic, van der Waal, and π–π stacking interactions with the conjugated polymer backbone. Uniform quantum dot dispersion in polyaniline may result in inimitable morphology, electrical conductivity, electrochemical properties, capacitance, and sensing features. Finally, this review expounds on the many applications for polyaniline/quantum dot nanocomposites including dye-sensitized solar cell, supercapacitor, electronics, gas sensor, biosensor, and bioimaging.

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Zhang, Ya-ni, Zhuo-ying Song, Dun Qiao, Xiao-hui Li, Zhe Guang, Shao-peng Li, Li-bin Zhou, and Xiao-han Chen. "2D van der Waals materials for ultrafast pulsed fiber lasers: review and prospect." Nanotechnology 33, no. 8 (December 3, 2021): 082003. http://dx.doi.org/10.1088/1361-6528/ac3611.

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Abstract 2D van der Waals materials are crystals composed of atomic layers, which have atomic thickness scale layers and rich distinct properties, including ultrafast optical response, surface effects, light-mater interaction, small size effects, quantum effects and macro quantum tunnel effects. With the exploration of saturable absorption characteristic of 2D van der Waals materials, a series of potential applications of 2D van der Waals materials as high threshold, broadband and fast response saturable absorbers (SAs) in ultrafast photonics have been proposed and confirmed. Herein, the photoelectric characteristics, nonlinear characteristic measurement technique of 2D van der Waals materials and the preparation technology of SAs are systematically described. Furthermore, the ultrafast pulsed fiber lasers based on classical 2D van der Waals materials including graphene, transition metal chalcogenides, topological insulators and black phosphorus have been fully summarized and analyzed. On this basis, opportunities and directions in this field, as well as the research results of ultrafast pulsed fiber lasers based on the latest 2D van der Waals materials (such as PbO, FePSe3, graphdiyne, bismuthene, Ag2S and MXene etc), are reviewed and summarized.

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Wu, Yan-Fei, Meng-Yuan Zhu, Rui-Jie Zhao, Xin-Jie Liu, Yun-Chi Zhao, Hong-Xiang Wei, Jing-Yan Zhang, et al. "The fabrication and physical properties of two-dimensional van der Waals heterostructures." Acta Physica Sinica 71, no. 4 (2022): 048502. http://dx.doi.org/10.7498/aps.71.20212033.

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Two-dimensional van der Waals materials (2D materials for short) have developed into a novel material family that has attracted much attention, and thus the integration, performance and application of 2D van der Waals heterostructures has been one of the research hotspots in the field of condensed matter physics and materials science. The 2D van der Waals heterostructures provide a flexible and extensive platform for exploring diverse physical effects and novel physical phenomena, as well as for constructing novel spintronic devices. In this topical review article, starting with the transfer technology of 2D materials, we will introduce the construction, performance and application of 2D van der Waals heterostructures. Firstly, the preparation technology of 2D van der Waals heterostructures in detail will be presented according to the two classifications of wet transfer and dry transfer, including general equipment for transfer technology, the detailed steps of widely used transfer methods, a three-dimensional manipulating method for 2D materials, and hetero-interface cleaning methods. Then, we will introduce the performance and application of 2D van der Waals heterostructures, with a focus on 2D magnetic van der Waals heterostructures and their applications in the field of 2D van der Waals magnetic tunnel junctions and moiré superlattices. The development and optimization of 2D materials transfer technology will boost 2D van der Waals heterostructures to achieve breakthrough results in fundamental science research and practical application.

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Han, Hui, Hong Lin, Wei Gan, Yucheng Liu, Ruichun Xiao, Lei Zhang, Yang Li, Changjin Zhang, and Hui Li. "Emergent mixed antiferromagnetic state in MnPS_3(1-x)Se_3x." Applied Physics Letters 122, no. 3 (January 16, 2023): 033101. http://dx.doi.org/10.1063/5.0135557.

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The discovery of magnetism in van der Waal (vdW) materials has aroused substantial interest in the exploration of magnetic interactions toward a two-dimensional (2D) limit. Here, we report the engineering of magnetic properties in MnPS3(1-x)Se3x compounds by substituting the non-magnetic chalcogenide S atoms with Se atoms. The anisotropic antiferromagnetic transition of MnPS3(1-x)Se3x compounds is gradually modulated by controlling the Se concentration, including the monotonic decrease in the Néel temperature and Curie–Weiss temperature with increasing Se concentration, and the Se concentration dependence of a spin-flop process. In addition, the magnetic phase diagram is established, in which an exotic mixed antiferromagnetic state appears due to the competition between the magnetic orderings in parent materials of MnPS3 and MnPSe3. Our findings validate the possibility of the manipulation of magnetic properties in magnetic vdW materials through the substitution of chalcogenide ions and pave the way toward the engineering of magnetic interactions and the designing of magnetic devices in two-dimensional magnetic vdW materials.

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Song, Xiaohui, Mingxiang Chen, Jingshuang Zhang, Rui Zhang, and Wei Zhang. "Study on Nanoporous Graphene-Based Hybrid Architecture for Surface Bonding." Nanomaterials 12, no. 14 (July 20, 2022): 2483. http://dx.doi.org/10.3390/nano12142483.

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Graphene-copper nanolayered composites have received research interest as promising packaging materials in developing next-generation electronic and optoelectronic devices. The weak van der Waal (vdW) contact between graphene and metal matrix significantly reduces the mechanical performance of such composites. The current study describes a new Cu-nanoporous graphene-Cu based bonding method with a low bonding temperature and good dependability. The deposition of copper atoms onto nanoporous graphene can help to generate nanoislands on the graphene surface, facilitating atomic diffusion bonding to bulk copper bonding surfaces at low temperatures, according to our extensive molecular dynamics (MD) simulations on the bonding process and pull-out verification using the canonical ensemble (NVT). Furthermore, the interfacial mechanical characteristics of graphene/Cu nanocomposites can be greatly improved by the resistance of nanostructure in nanoporous graphene. These findings are useful in designing advanced metallic surface bonding processes and graphene-based composites with tenable performance.

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Chen, Yicong, Jun Chen, and Zhibing Li. "Cold Cathodes with Two-Dimensional van der Waals Materials." Nanomaterials 13, no. 17 (August 28, 2023): 2437. http://dx.doi.org/10.3390/nano13172437.

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Two-dimensional van der Waals materials could be used as electron emitters alone or stacked in a heterostructure. Many significant phenomena of two-dimensional van der Waals field emitters have been observed and predicted since the landmark discovery of graphene. Due to the wide variety of heterostructures that integrate an atomic monolayer or multilayers with insulator nanofilms or metallic cathodes by van der Waals force, the diversity of van der Waals materials is large to be chosen from, which are appealing for further investigation. Until now, increasing the efficiency, stability, and uniformity in electron emission of cold cathodes with two-dimensional materials is still of interest in research. Some novel behaviors in electron emission, such as coherence and directionality, have been revealed by the theoretical study down to the atomic scale and could lead to innovative applications. Although intensive emission in the direction normal to two-dimensional emitters has been observed in experiments, the theoretical mechanism is still incomplete. In this paper, we will review some late progresses related to the cold cathodes with two-dimensional van der Waals materials, both in experiments and in the theoretical study, emphasizing the phenomena which are absent in the conventional cold cathodes. The review will cover the fabrication of several kinds of emitter structures for field emission applications, the state of the art of their field emission properties and the existing field emission model. In the end, some perspectives on their future research trend will also be given.

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Tahersima, Mohammad Hossein, and Volker J. Sorger. "Strong Photon Absorption in 2-D Material-Based Spiral Photovoltaic Cells." MRS Advances 1, no. 59 (2016): 3915–21. http://dx.doi.org/10.1557/adv.2016.19.

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ABSTRACTAtomically thin transition-metal dichalcogenides (TMD) hold promise for making ultrathin-film photovoltaic devices with a combination of excellent photo-absorption and mechanical flexibility. However, reported absorption for photovoltaic cells based on TMD materials is still just a few percent of the incident light due to their sub-wavelength thickness leading to low cell efficiencies. Here we discuss that taking advantage of the mechanical flexibility of two dimensional (2D) materials by rolling their Van der Waal heterostructures such as molybdenum disulfide (MoS2)/graphene (Gr)/hexagonal boron nitride (hBN) to a spiral solar cell, leads to strong light matter interaction allowing for solar absorptions up to 90%. The optical absorption of a 1 µm-long hetero-material spiral cell consisting of the aforementioned hetero stacks is about 50% stronger compared to a planar MoS2 cell of the same thickness; although the volumetric absorbing material ratio is only 6%. We anticipate these results to provide guidance for photonic structures that take advantage of the unique properties of 2D materials in solar energy conversion applications.

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Paul, Saurav, Bimal B. Chakraborty, Kuheli Deb, and Sudip Choudhury. "FUSED RING HETEROCYCLE FUNCTIONALIZED GOLD NANOPARTICLES: SYNTHESIS AND SELF-ASSEMBLY." Chemical Problems 21, no. 2 (2023): 188–96. http://dx.doi.org/10.32737/2221-8688-2023-2-188-196.

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Self-assembled nanoparticles are an area of great research prospect as they offer switchable element for designing and creating micro-scale constructs. Self-assembly of nano-hybrids through some noncovalent interactions such as electrostatic, π-π and van der Waal interactions in different classes of composite materials provide a great prospect of utilization of these functional properties in tailor-made device applications. In this work gold nanoparticle functionalized with coumarin based fused-ring heterocyclic thiol exhibiting self-assembly is reported. The present work has been designed giving prior to pi-stacking mediated self-aggregation of nanoparticles resulting formation of larger superstructures. The work reports the coumarin-based heterocyclic fused ring having a thiol anchoring group grafted to the gold nanoparticle surface for easier electron flow between the metal nanoparticle and the aromatic ligand and study their self-assembly nature.

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Liang, Yan, Shiying Shen, Baibiao Huang, Ying Dai, and Yandong Ma. "Intercorrelated ferroelectrics in 2D van der Waals materials." Materials Horizons 8, no. 6 (2021): 1683–89. http://dx.doi.org/10.1039/d1mh00446h.

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Ermolaev, Georgy, Dmitriy Grudinin, Kirill Voronin, Andrey Vyshnevyy, Aleksey Arsenin, and Valentyn Volkov. "Van Der Waals Materials for Subdiffractional Light Guidance." Photonics 9, no. 10 (October 9, 2022): 744. http://dx.doi.org/10.3390/photonics9100744.

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Photonics is a natural next technological step after an era of electronics. However, the diffraction limit of light poses severe limitations on photonic elements and dictates their size. Herein, we demonstrate that layered semiconductors solve this challenge thanks to their giant optical anisotropy. In particular, waveguides with molybdenum disulfide (MoS2) and tungsten disulfide (WS2) claddings can operate in a transparency region slightly above (20%) the diffraction limit and even overcome it by 10% around 700 nm, providing an even better confinement than air cladding, but with excitonic losses. Further analysis reveals that van der Waals materials with an in-plane refractive index of about five or an out-of-plane index around two provide subdiffractional and lossless guidance. Therefore, our results establish the route for ultra-dense photonic integration based on layered materials.

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Antony, Abhinandan, Martin V. Gustafsson, Guilhem J. Ribeill, Matthew Ware, Anjaly Rajendran, Luke C. G. Govia, Thomas A. Ohki, et al. "Miniaturizing Transmon Qubits Using van der Waals Materials." Nano Letters 21, no. 23 (November 18, 2021): 10122–26. http://dx.doi.org/10.1021/acs.nanolett.1c04160.

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Ryu, Yu Kyoung, Riccardo Frisenda, and Andres Castellanos-Gomez. "Superlattices based on van der Waals 2D materials." Chemical Communications 55, no. 77 (2019): 11498–510. http://dx.doi.org/10.1039/c9cc04919c.

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Burch, Kenneth S., David Mandrus, and Je-Geun Park. "Magnetism in two-dimensional van der Waals materials." Nature 563, no. 7729 (October 31, 2018): 47–52. http://dx.doi.org/10.1038/s41586-018-0631-z.

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Duong, Dinh Loc, Seok Joon Yun, and Young Hee Lee. "van der Waals Layered Materials: Opportunities and Challenges." ACS Nano 11, no. 12 (December 13, 2017): 11803–30. http://dx.doi.org/10.1021/acsnano.7b07436.

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Masenelli, B., F. Tournus, P. Mélinon, X. Blase, A. Perez, M. Pellarin, M. Broyer, A. M. Flank, and P. Lagarde. "Towards non-van der Waals C60-based materials." Materials Science and Engineering: A 375-377 (July 2004): 1285–88. http://dx.doi.org/10.1016/j.msea.2003.10.161.

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Liu, Chang-hua, Jiajiu Zheng, Yueyang Chen, Taylor Fryett, and Arka Majumdar. "Van der Waals materials integrated nanophotonic devices [Invited]." Optical Materials Express 9, no. 2 (January 3, 2019): 384. http://dx.doi.org/10.1364/ome.9.000384.

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Asensio, Maria C., and Matthias Batzill. "Interfaces and heterostructures of van der Waals materials." Journal of Physics: Condensed Matter 28, no. 49 (October 7, 2016): 490301. http://dx.doi.org/10.1088/0953-8984/28/49/490301.

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Dumcenco, Dumitru, and Enrico Giannini. "Growth of van der Waals magnetic semiconductor materials." Journal of Crystal Growth 548 (October 2020): 125799. http://dx.doi.org/10.1016/j.jcrysgro.2020.125799.

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Och, Mauro, Marie-Blandine Martin, Bruno Dlubak, Pierre Seneor, and Cecilia Mattevi. "Synthesis of emerging 2D layered magnetic materials." Nanoscale 13, no. 4 (2021): 2157–80. http://dx.doi.org/10.1039/d0nr07867k.

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Sharma, Rohit, Radhapiyari Laishram, Bipin Kumar Gupta, Ritu Srivastva, and Om Prakash Sinha. "A Review on MX2 (M = Mo, W and X = S, Se) layered material for opto-electronic devices." Advances in Natural Sciences: Nanoscience and Nanotechnology 13, no. 2 (May 18, 2022): 023001. http://dx.doi.org/10.1088/2043-6262/ac5cb6.

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Abstract After discovering the steppingstone of two-dimensional (2D) materials, i.e. graphene, researchers are keen to explore the world of 2D materials beyond graphene for new frontiers and challenges. Due to bandgap limitation, graphene does not fit for the logic and optoelectronic applications which need well defined on/off ratio. Recently, single-layer (SL) and few-layer (FL) transition metal dichalcogenides have emerged as a new family of layered materials with great interest, not only for the fundamental point of view, but also due to its potential application in ultrathin modern devices. As the transition metal dichalcogenides (TMDs) have a direct bandgap in their single layer, which falls under the visible region of the electromagnetic spectrum and has better physical and chemical properties, making them a suitable candidate for logic and optoelectronic applications. This review includes the recent extensive development on the synthesis and transfer strategies of MX2 (M = Mo, W and X = S, Se) 2D nanostructures of semiconducting TMDs. Further, this review covers the electronic and optoelectronic applications of these nanostructures along with progress in Van der Waal structures. The advantage and unambiguity of these materials are also discussed.

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Kim, Shi En, Fauzia Mujid, Akash Rai, Fredrik Eriksson, Joonki Suh, Preeti Poddar, Ariana Ray, et al. "Extremely anisotropic van der Waals thermal conductors." Nature 597, no. 7878 (September 29, 2021): 660–65. http://dx.doi.org/10.1038/s41586-021-03867-8.

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AbstractThe densification of integrated circuits requires thermal management strategies and high thermal conductivity materials1–3. Recent innovations include the development of materials with thermal conduction anisotropy, which can remove hotspots along the fast-axis direction and provide thermal insulation along the slow axis4,5. However, most artificially engineered thermal conductors have anisotropy ratios much smaller than those seen in naturally anisotropic materials. Here we report extremely anisotropic thermal conductors based on large-area van der Waals thin films with random interlayer rotations, which produce a room-temperature thermal anisotropy ratio close to 900 in MoS2, one of the highest ever reported. This is enabled by the interlayer rotations that impede the through-plane thermal transport, while the long-range intralayer crystallinity maintains high in-plane thermal conductivity. We measure ultralow thermal conductivities in the through-plane direction for MoS2 (57 ± 3 mW m−1 K−1) and WS2 (41 ± 3 mW m−1 K−1) films, and we quantitatively explain these values using molecular dynamics simulations that reveal one-dimensional glass-like thermal transport. Conversely, the in-plane thermal conductivity in these MoS2 films is close to the single-crystal value. Covering nanofabricated gold electrodes with our anisotropic films prevents overheating of the electrodes and blocks heat from reaching the device surface. Our work establishes interlayer rotation in crystalline layered materials as a new degree of freedom for engineering-directed heat transport in solid-state systems.

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Di Bartolomeo, Antonio. "Emerging 2D Materials and Their Van Der Waals Heterostructures." Nanomaterials 10, no. 3 (March 22, 2020): 579. http://dx.doi.org/10.3390/nano10030579.

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Two-dimensional (2D) materials and their van der Waals heterojunctions offer the opportunity to combine layers with different properties as the building blocks to engineer new functional materials for high-performance devices, sensors, and water-splitting photocatalysts. A tremendous amount of work has been done thus far to isolate or synthesize new 2D materials as well as to form new heterostructures and investigate their chemical and physical properties. This article collection covers state-of-the-art experimental, numerical, and theoretical research on 2D materials and on their van der Waals heterojunctions for applications in electronics, optoelectronics, and energy generation.

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Balandin, Alexander A. "Phonon engineering in graphene and van der Waals materials." MRS Bulletin 39, no. 9 (September 2014): 817–23. http://dx.doi.org/10.1557/mrs.2014.169.

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Michaelis de Vasconcellos, Steffen, Daniel Wigger, Ursula Wurstbauer, Alexander W. Holleitner, Rudolf Bratschitsch, and Tilmann Kuhn. "Single‐Photon Emitters in Layered Van der Waals Materials." physica status solidi (b) 259, no. 4 (February 18, 2022): 2100566. http://dx.doi.org/10.1002/pssb.202100566.

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Zhang, Wenjing, Qixing Wang, Yu Chen, Zhuo Wang, and Andrew T. S. Wee. "Van der Waals stacked 2D layered materials for optoelectronics." 2D Materials 3, no. 2 (April 13, 2016): 022001. http://dx.doi.org/10.1088/2053-1583/3/2/022001.

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Rhodes, Daniel, Sang Hoon Chae, Rebeca Ribeiro-Palau, and James Hone. "Disorder in van der Waals heterostructures of 2D materials." Nature Materials 18, no. 6 (May 21, 2019): 541–49. http://dx.doi.org/10.1038/s41563-019-0366-8.

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Quan, Silong, Linghui He, and Yong Ni. "Tunable mosaic structures in van der Waals layered materials." Physical Chemistry Chemical Physics 20, no. 39 (2018): 25428–36. http://dx.doi.org/10.1039/c8cp04360d.

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Ruta, Francesco L., Aaron J. Sternbach, Adji B. Dieng, Alexander S. McLeod, and D. N. Basov. "Quantitative Nanoinfrared Spectroscopy of Anisotropic van der Waals Materials." Nano Letters 20, no. 11 (September 16, 2020): 7933–40. http://dx.doi.org/10.1021/acs.nanolett.0c02671.

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Walsh, Lee A., and Christopher L. Hinkle. "van der Waals epitaxy: 2D materials and topological insulators." Applied Materials Today 9 (December 2017): 504–15. http://dx.doi.org/10.1016/j.apmt.2017.09.010.

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Jie, Wenjing, Zhibin Yang, Gongxun Bai, and Jianhua Hao. "Luminescence in 2D Materials and van der Waals Heterostructures." Advanced Optical Materials 6, no. 10 (March 23, 2018): 1701296. http://dx.doi.org/10.1002/adom.201701296.

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46

Yao, Jiandong, and Guowei Yang. "Van der Waals heterostructures based on 2D layered materials: Fabrication, characterization, and application in photodetection." Journal of Applied Physics 131, no. 16 (April 28, 2022): 161101. http://dx.doi.org/10.1063/5.0087503.

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Construction of heterostructures has provided a tremendous degree of freedom to integrate, exert, and extend the features of various semiconductors, thereby opening up distinctive opportunities for the upcoming modern optoelectronics. The abundant physical properties and dangling-bond-free interface have enabled 2D layered materials serving as magical “Lego blocks” for building van der Waals heterostructures, which bring about superior contact quality (atomically sharp and distortionless) and the combination of functional units with various merits. Therefore, these heterostructures have been the focus of intensive research in the past decade. This Tutorial begins with a variety of strategies for fabricating van der Waals heterojunctions, categorized into the transfer-stacking method and in situ growth assembly method. Then, the techniques commonly exploited for characterizing the structure, morphology, band alignment, interlayer coupling, and dynamics of photocarriers of van der Waals heterojunctions are summarized, including Raman spectroscopy, photoluminescence spectroscopy, atomic force microscopy, conductive atomic force microscopy, Kelvin probe force microscope, ultraviolet photoelectron spectroscopy, transfer characteristic analysis, scanning photocurrent microscopy, etc. Following that, the application of various van der Waals heterojunctions for diverse photoelectric detection is comprehensively overviewed. On the whole, this Tutorial has epitomized the fabrication, characterization, and photodetection application of van der Waals heterostructures, which aims to provide instructive guidance for the abecedarians in this emerging field and offer impetus of advancing this rapidly evolving domain.

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47

Yao, Jiandong, and Guowei Yang. "Van der Waals heterostructures based on 2D layered materials: Fabrication, characterization, and application in photodetection." Journal of Applied Physics 131, no. 16 (April 28, 2022): 161101. http://dx.doi.org/10.1063/5.0087503.

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Abstract:

Construction of heterostructures has provided a tremendous degree of freedom to integrate, exert, and extend the features of various semiconductors, thereby opening up distinctive opportunities for the upcoming modern optoelectronics. The abundant physical properties and dangling-bond-free interface have enabled 2D layered materials serving as magical “Lego blocks” for building van der Waals heterostructures, which bring about superior contact quality (atomically sharp and distortionless) and the combination of functional units with various merits. Therefore, these heterostructures have been the focus of intensive research in the past decade. This Tutorial begins with a variety of strategies for fabricating van der Waals heterojunctions, categorized into the transfer-stacking method and in situ growth assembly method. Then, the techniques commonly exploited for characterizing the structure, morphology, band alignment, interlayer coupling, and dynamics of photocarriers of van der Waals heterojunctions are summarized, including Raman spectroscopy, photoluminescence spectroscopy, atomic force microscopy, conductive atomic force microscopy, Kelvin probe force microscope, ultraviolet photoelectron spectroscopy, transfer characteristic analysis, scanning photocurrent microscopy, etc. Following that, the application of various van der Waals heterojunctions for diverse photoelectric detection is comprehensively overviewed. On the whole, this Tutorial has epitomized the fabrication, characterization, and photodetection application of van der Waals heterostructures, which aims to provide instructive guidance for the abecedarians in this emerging field and offer impetus of advancing this rapidly evolving domain.

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Kumazoe, Hiroyuki, Aravind Krishnamoorthy, Lindsay Bassman, Fuyuki Shimojo, Rajiv K. Kalia, Aiichiro Nakano, and Priya Vashishta. "Photo-induced Contraction of Layered Materials." MRS Advances 3, no. 6-7 (2018): 333–38. http://dx.doi.org/10.1557/adv.2018.127.

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ABSTRACTUltrafast atomic dynamics induced by electronic and optical excitation opens new possibilities for functionalization of two-dimensional and layered materials. Understanding the impact of perturbed valence band populations on both the strong covalent bonds and relatively weaker van der Waals interactions is important for these anisotropic systems. While the dynamics of strong covalent bonds has been explored both experimentally and theoretically, relatively fewer studies have focused on the impact of excitation on weak bonds like van der Waals and hydrogen-bond interactions. We perform non-adiabatic quantum molecular dynamics (NAQMD) simulations to study photo-induced dynamics in MoS2 bilayer. We observe photo-induced non-thermal contraction of the interlayer distance in the MoS2 bilayer within 100 femtoseconds after photoexcitation. We identify a large photo-induced redistribution of electronic charge density, whose Coulombic interactions could explain the observed inter-layer contraction.

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Loskill, Peter, Jonathan Puthoff, Matt Wilkinson, Klaus Mecke, Karin Jacobs, and Kellar Autumn. "Macroscale adhesion of gecko setae reflects nanoscale differences in subsurface composition." Journal of The Royal Society Interface 10, no. 78 (January 6, 2013): 20120587. http://dx.doi.org/10.1098/rsif.2012.0587.

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Surface energies are commonly used to determine the adhesion forces between materials. However, the component of surface energy derived from long-range forces, such as van der Waals forces, depends on the material's structure below the outermost atomic layers. Previous theoretical results and indirect experimental evidence suggest that the van der Waals energies of subsurface layers will influence interfacial adhesion forces. We discovered that nanometre-scale differences in the oxide layer thickness of silicon wafers result in significant macroscale differences in the adhesion of isolated gecko setal arrays. Si/SiO 2 bilayer materials exhibited stronger adhesion when the SiO 2 layer is thin (approx. 2 nm). To further explore how layered materials influence adhesion, we functionalized similar substrates with an octadecyltrichlorosilane monolayer and again identified a significant influence of the SiO 2 layer thickness on adhesion. Our theoretical calculations describe how variation in the SiO 2 layer thickness produces differences in the van der Waals interaction potential, and these differences are reflected in the adhesion mechanics. Setal arrays used as tribological probes provide the first empirical evidence that the ‘subsurface energy’ of inhomogeneous materials influences the macroscopic surface forces.

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Peng, Qing, Guangyu Wang, Gui-Rong Liu, and Suvranu De. "Van der Waals Density Functional Theory vdW-DFq for Semihard Materials." Crystals 9, no. 5 (May 8, 2019): 243. http://dx.doi.org/10.3390/cryst9050243.

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There are a large number of materials with mild stiffness, which are not as soft as tissues and not as strong as metals. These semihard materials include energetic materials, molecular crystals, layered materials, and van der Waals crystals. The integrity and mechanical stability are mainly determined by the interactions between instantaneously induced dipoles, the so called London dispersion force or van der Waals force. It is challenging to accurately model the structural and mechanical properties of these semihard materials in the frame of density functional theory where the non-local correlation functionals are not well known. Here, we propose a van der Waals density functional named vdW-DFq to accurately model the density and geometry of semihard materials. Using β -cyclotetramethylene tetranitramine as a prototype, we adjust the enhancement factor of the exchange energy functional with generalized gradient approximations. We find this method to be simple and robust over a wide tuning range when calibrating the functional on-demand with experimental data. With a calibrated value q = 1.05 , the proposed vdW-DFq method shows good performance in predicting the geometries of 11 common energetic material molecular crystals and three typical layered van der Waals crystals. This success could be attributed to the similar electronic charge density gradients, suggesting a wide use in modeling semihard materials. This method could be useful in developing non-empirical density functional theories for semihard and soft materials.

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Journal articles on the topic 'Van der Waal materials'

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