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Artículos de revistas sobre el tema "Van der Waals Hybrids"

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Autor: Grafiati
Publicado: 6 de septiembre de 2023

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1

Karnatak, Paritosh, Tathagata Paul, Saurav Islam y Arindam Ghosh. "1 / f noise in van der Waals materials and hybrids". Advances in Physics: X 2, n.º 2 (4 de marzo de 2017): 428–49. http://dx.doi.org/10.1080/23746149.2017.1314192.

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2

Sett, Shaili, Aparna Parappurath, Navkiranjot Kaur Gill, Neha Chauhan y Arindam Ghosh. "Engineering sensitivity and spectral range of photodetection in van der Waals materials and hybrids". Nano Express 3, n.º 1 (21 de enero de 2022): 014001. http://dx.doi.org/10.1088/2632-959x/ac46b9.

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Abstract Exploration of van der Waals heterostructures in the field of optoelectronics has produced photodetectors with very high bandwidth as well as ultra-high sensitivity. Appropriate engineering of these heterostructures allows us to exploit multiple light-to-electricity conversion mechanisms, ranging from photovoltaic, photoconductive to photogating processes. These mechanisms manifest in different sensitivity and speed of photoresponse. In addition, integrating graphene-based hybrid structures with photonic platforms provides a high gain-bandwidth product, with bandwidths ≫1 GHz. In this review, we discuss the progression in the field of photodetection in 2D hybrids. We emphasize the physical mechanisms at play in diverse architectures and discuss the origin of enhanced photoresponse in hybrids. Recent developments in 2D photodetectors based on room temperature detection, photon-counting ability, integration with Si and other pressing issues, that need to be addressed for these materials to be integrated with industrial standards have been discussed.
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3

Shukla, Vivekanand, Yang Jiao, Carl M. Frostenson y Per Hyldgaard. "vdW-DF-ahcx: a range-separated van der Waals density functional hybrid". Journal of Physics: Condensed Matter 34, n.º 2 (1 de noviembre de 2021): 025902. http://dx.doi.org/10.1088/1361-648x/ac2ad2.

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Abstract Hybrid density functionals replace a fraction of an underlying generalized-gradient approximation (GGA) exchange description with a Fock-exchange component. Range-separated hybrids (RSHs) also effectively screen the Fock-exchange component and thus open the door for characterizations of metals and adsorption at metal surfaces. The RSHs are traditionally based on a robust GGA, such as PBE (Perdew J P et al 1996 Phys. Rev. Lett. 77 3865), for example, as implemented in the HSE design (Heyd J et al 2003 J. Chem. Phys. 118 8207). Here we define an analytical-hole (Henderson T M et al 2008 J. Chem. Phys. 128 194105) consistent-exchange RSH extension to the van der Waals density functional (vdW-DF) method (Berland K et al 2015 Rep. Prog. Phys. 78 066501), launching vdW-DF-ahcx. We characterize the GGA-type exchange in the vdW-DF-cx version (Berland K and Hyldgaard P 2014 Phys. Rev. B 89 035412), isolate the short-ranged exchange component, and define the new vdW-DF hybrid. We find that the performance vdW-DF-ahcx compares favorably to (dispersion-corrected) HSE for descriptions of bulk (broad molecular) properties. We also find that it provides accurate descriptions of noble-metal surface properties, including CO adsorption.
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4

Guo, L. L., L. M. Chen, H. X. Liu y Shi Xi Ouyang. "The Influence of the Interactions between the Organic and Inorganic Species on the Structural Stabilities of Hybrids (CnH2n+1NH3)2 MCl4". Solid State Phenomena 111 (abril de 2006): 143–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.111.143.

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This paper focuses on the influence of interactions between different species in hybrids (CnH2n+1NH3)2MCl4 (M = Mn, Cu; n =2,4,6,8,10) on the structural stabilities. DSC-TG curves were used to find out the onset and the end decomposition temperatures. The results show that the hybrids of M =Cu start to decompose at about 210 centigrade degrees, average 25 centigrade degrees lower than that of M=Mn. The end temperatures of M=Cu are also lower. This suggests that in this case the thermal stabilities of the hybrids would be governed by the interactions between the organic and inorganic species and are little affected by weak Van de Waals interactions between the organic and organic species.
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5

Ahmed, Tanweer, Saurav Islam, Tathagata Paul, N. Hariharan, Suja Elizabeth y Arindam Ghosh. "A generic method to control hysteresis and memory effect in Van der Waals hybrids". Materials Research Express 7, n.º 1 (21 de enero de 2020): 014004. http://dx.doi.org/10.1088/2053-1591/ab6923.

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6

Wang, Hao-Fan, Cheng Tang y Qiang Zhang. "A review of graphene-based 3D van der Waals hybrids and their energy applications". Nano Today 25 (abril de 2019): 27–37. http://dx.doi.org/10.1016/j.nantod.2019.02.006.

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7

Li, Mingxing, Jia-Shiang Chen y Mircea Cotlet. "Light-Induced Interfacial Phenomena in Atomically Thin 2D van der Waals Material Hybrids and Heterojunctions". ACS Energy Letters 4, n.º 9 (5 de agosto de 2019): 2323–35. http://dx.doi.org/10.1021/acsenergylett.9b01399.

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8

Idrees, M., H. U. Din, R. Ali, G. Rehman, T. Hussain, C. V. Nguyen, Iftikhar Ahmad y B. Amin. "Optoelectronic and solar cell applications of Janus monolayers and their van der Waals heterostructures". Physical Chemistry Chemical Physics 21, n.º 34 (2019): 18612–21. http://dx.doi.org/10.1039/c9cp02648g.

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9

Nguyen, Dinh Huong y Dai Soo Lee. "Hybrids of Graphenes and Silver Nanoparticles Prepared by In Situ Process Employing Microwaveirradiation". Advanced Materials Research 646 (enero de 2013): 97–100. http://dx.doi.org/10.4028/www.scientific.net/amr.646.97.

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Fine dispersion of graphenes is crucial for the application of graphenein various fields. However, graphenes are frequently aggregated due to the large surface area and van der Waals interactions between themselves during the mixing process. Thus, various modifications of graphenes are necessary for the fine dispersion. Introduction of functional groups into graphenes accompanies loss of inherent advantages. In this study, introduction of silver nanoparticles into graphenes by in situ process was investigated. Especially, microwave irradiation was employed for the syntheses sincegraphenes absorb microwave efficiently and became heated quickly. Formation of silver nanoparticles on the grapheneafter microwave irradiation was confirmed and the average diameter of the silver nanoparticles in the hybrids was about 30 nm. Rheological and electrical properties of the epoxy resins filled with the hybrids are discussed in this report.
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10

Esquivel-Sirvent, Raul. "Finite-Size Effects of Casimir–van der Waals Forces in the Self-Assembly of Nanoparticles". Physics 5, n.º 1 (21 de marzo de 2023): 322–30. http://dx.doi.org/10.3390/physics5010024.

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Casimir–van der Waals forces are important in the self-assembly processes of nanoparticles. In this paper, using a hybrid approach based on Lifshitz theory of Casimir–van der Waals interactions and corrections due to the shape of the nanoparticles, it is shown that for non-spherical nanoparticles, the usual Hamaker approach overestimates the magnitude of the interaction. In particular, the study considers nanoplates of different thicknesses, nanocubes assembled with their faces parallel to each other, and tilted nanocubes, where the main interaction is between edges.
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11

Wang, Haizhen, Jiaqi Ma y Dehui Li. "Two-Dimensional Hybrid Perovskite-Based van der Waals Heterostructures". Journal of Physical Chemistry Letters 12, n.º 34 (20 de agosto de 2021): 8178–87. http://dx.doi.org/10.1021/acs.jpclett.1c02290.

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12

Ernandes, Cyrine, Lama Khalil, Hugo Henck, Meng-Qiang Zhao, Julien Chaste, Fabrice Oehler, Alan T. Charlie Johnson et al. "Strain and Spin-Orbit Coupling Engineering in Twisted WS2/Graphene Heterobilayer". Nanomaterials 11, n.º 11 (31 de octubre de 2021): 2921. http://dx.doi.org/10.3390/nano11112921.

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The strain in hybrid van der Waals heterostructures, made of two distinct two-dimensional van der Waals materials, offers an interesting handle on their corresponding electronic band structure. Such strain can be engineered by changing the relative crystallographic orientation between the constitutive monolayers, notably, the angular misorientation, also known as the “twist angle”. By combining angle-resolved photoemission spectroscopy with density functional theory calculations, we investigate here the band structure of the WS2/graphene heterobilayer for various twist angles. Despite the relatively weak coupling between WS2 and graphene, we demonstrate that the resulting strain quantitatively affects many electronic features of the WS2 monolayers, including the spin-orbit coupling strength. In particular, we show that the WS2 spin-orbit splitting of the valence band maximum at K can be tuned from 430 to 460 meV. Our findings open perspectives in controlling the band dispersion of van der Waals materials.
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13

Gerrer, Thomas, Volker Cimalla, Patrick Waltereit, Stefan Müller, Fouad Benkhelifa, Thomas Maier, Heiko Czap, Oliver Ambacher y Rüdiger Quay. "Transfer of AlGaN/GaN RF-devices onto diamond substrates via van der Waals bonding". International Journal of Microwave and Wireless Technologies 10, n.º 5-6 (25 de abril de 2018): 666–73. http://dx.doi.org/10.1017/s1759078718000582.

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AbstractWe present a novel bonding process for gallium nitride-based electronic devices on diamond heat spreaders. In the proposed technology, GaN devices are transferred from silicon (Si) onto single (SCD) and polycrystalline diamond (PCD) substrates by van der Waals bonding. Load-pull measurements on Si and SCD heat spreaders at 3 GHz and 50 V drain bias show comparable power-added-efficiency and output power (Pout) levels. A thermal analysis of the hybrids was performed by comparison of 2 × 1mm2AlGaN/GaN Schottky diodes on Si, PCD, and SCD, which exhibit a homogeneous field in the channel in contrast to gated transistors. Significantly different currents are observed due to the temperature dependent mobility in the 2DEG channel. These measurements are supported by a 3D thermal finite element analysis, which suggests a large impact of our transfer technique on the thermal resistance of these devices. In summary, we show a promising new GaN-on-diamond technology for future high-power, microwave GaN device applications.
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14

Sternbach, A. J., S. L. Moore, A. Rikhter, S. Zhang, R. Jing, Y. Shao, B. S. Y. Kim et al. "Negative refraction in hyperbolic hetero-bicrystals". Science 379, n.º 6632 (10 de febrero de 2023): 555–57. http://dx.doi.org/10.1126/science.adf1065.

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We visualized negative refraction of phonon polaritons, which occurs at the interface between two natural crystals. The polaritons—hybrids of infrared photons and lattice vibrations—form collimated rays that display negative refraction when passing through a planar interface between the two hyperbolic van der Waals materials: molybdenum oxide (MoO 3 ) and isotopically pure hexagonal boron nitride (h 11 BN). At a special frequency ω 0 , these rays can circulate along closed diamond-shaped trajectories. We have shown that polariton eigenmodes display regions of both positive and negative dispersion interrupted by multiple gaps that result from polaritonic-level repulsion and strong coupling.
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15

Zhang, Lixiu, Bing Lu, Yuhou Wu, Junhai Wang, Xinyue Zhang, Liyan Wang y Dongyang Xi. "Molecular dynamics simulation and experimental study on the lubrication of graphene additive films". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, n.º 12 (10 de enero de 2020): 1957–72. http://dx.doi.org/10.1177/1350650119899213.

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Friction between silicon nitride (Si3N4) and bearing steel (GCr15) affects the hybrid bearing performance. The effects of graphene as an additive in n-hexadecane (C16H34) lubricating oil on the lubricating properties of a Si3N4-GCr15 friction pair were studied. The effects of pressure and shear velocity on the coefficient of friction and friction force were probed experimentally, while the changes in the van der Waals energy, shear stress, and thickness of the solid film in the lubrication area were simulated by molecular dynamics methods. Graphene additives increased the van der Waals energy and thickness of the solid film in the lubrication region, while reducing the shear stress of the Si3N4-GCr15 friction pair, coefficient of friction, and friction force. Furthermore, the lower the overall shearing velocity, the lower was the van der Waals energy and shear stress, and the thicker was the solid film. Finally, as the pressure and shear velocity increased, graphene exerted a greater influence on the lubricating properties of the Si3N4-GCr15 friction pair.
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16

YANG, PING, XIALONG LI, YANFANG ZHAO, HAIYING YANG, SHUTING WANG y JIANMING YANG. "INVESTIGATION FOR MOLECULAR ATTRACTION IMPACT BETWEEN CONTACTING SURFACES IN MICRO-GEARS". International Journal of Modern Physics B 27, n.º 27 (15 de octubre de 2013): 1350150. http://dx.doi.org/10.1142/s0217979213501506.

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The aim of this research work is to provide a systematic method to perform molecular attraction impact between contacting surfaces in micro-gear train. This method is established by integrating involute profile analysis and molecular dynamics simulation. A mathematical computation of micro-gear involute is presented based on geometrical properties, Taylor expression and Hamaker assumption. In the meantime, Morse potential function and the cut-off radius are introduced with a molecular dynamics simulation. So a hybrid computational method for the Van Der Waals force between the contacting faces in micro-gear train is developed. An example is illustrated to show the performance of this method. The results show that the change of Van Der Waals force in micro-gear train has a nonlinear characteristic with parameters change such as the modulus of the gear and the tooth number of gear etc. The procedure implies a potential feasibility that we can control the Van Der Waals force by adjusting the manufacturing parameters for gear train design.
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17

Alam, Qaisar, S. Muhammad, M. Idrees, Nguyen V. Hieu, Nguyen T. T. Binh, C. Nguyen y Bin Amin. "First-principles study of the electronic structures and optical and photocatalytic performances of van der Waals heterostructures of SiS, P and SiC monolayers". RSC Advances 11, n.º 24 (2021): 14263–68. http://dx.doi.org/10.1039/d0ra10808a.

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18

Pierucci, Debora, Aymen Mahmoudi, Mathieu Silly, Federico Bisti, Fabrice Oehler, Gilles Patriarche, Frédéric Bonell et al. "Evidence for highly p-type doping and type II band alignment in large scale monolayer WSe2/Se-terminated GaAs heterojunction grown by molecular beam epitaxy". Nanoscale 14, n.º 15 (2022): 5859–68. http://dx.doi.org/10.1039/d2nr00458e.

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19

Zhang, Wei y Lifa Zhang. "Electric field tunable band-gap crossover in black(blue) phosphorus/g-ZnO van der Waals heterostructures". RSC Advances 7, n.º 55 (2017): 34584–90. http://dx.doi.org/10.1039/c7ra06097a.

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20

Zheng, Zhikun, Xianghui Zhang, Christof Neumann, Daniel Emmrich, Andreas Winter, Henning Vieker, Wei Liu, Marga Lensen, Armin Gölzhäuser y Andrey Turchanin. "Hybrid van der Waals heterostructures of zero-dimensional and two-dimensional materials". Nanoscale 7, n.º 32 (2015): 13393–97. http://dx.doi.org/10.1039/c5nr03475b.

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21

Quhe, Ruge, Yangyang Wang, Meng Ye, Qiaoxuan Zhang, Jie Yang, Pengfei Lu, Ming Lei y Jing Lu. "Black phosphorus transistors with van der Waals-type electrical contacts". Nanoscale 9, n.º 37 (2017): 14047–57. http://dx.doi.org/10.1039/c7nr03941g.

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22

Wang, Biao, Xukai Luo, Junli Chang, Xiaorui Chen, Hongkuan Yuan y Hong Chen. "Efficient charge separation and visible-light response in bilayer HfS2-based van der Waals heterostructures". RSC Advances 8, n.º 34 (2018): 18889–95. http://dx.doi.org/10.1039/c8ra03047b.

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23

Chen, Guoping, Lok Kumar Shrestha y Katsuhiko Ariga. "Zero-to-Two Nanoarchitectonics: Fabrication of Two-Dimensional Materials from Zero-Dimensional Fullerene". Molecules 26, n.º 15 (30 de julio de 2021): 4636. http://dx.doi.org/10.3390/molecules26154636.

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Nanoarchitectonics of two-dimensional materials from zero-dimensional fullerenes is mainly introduced in this short review. Fullerenes are simple objects with mono-elemental (carbon) composition and zero-dimensional structure. However, fullerenes and their derivatives can create various types of two-dimensional materials. The exemplified approaches demonstrated fabrications of various two-dimensional materials including size-tunable hexagonal fullerene nanosheet, two-dimensional fullerene nano-mesh, van der Waals two-dimensional fullerene solid, fullerene/ferrocene hybrid hexagonal nanosheet, fullerene/cobalt porphyrin hybrid nanosheet, two-dimensional fullerene array in the supramolecular template, two-dimensional van der Waals supramolecular framework, supramolecular fullerene liquid crystal, frustrated layered self-assembly from two-dimensional nanosheet, and hierarchical zero-to-one-to-two dimensional fullerene assembly for cell culture.
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24

Park, Seo Yun, Yeon Hoo Kim, Seon Yong Lee, Woonbae Sohn, Jung Eun Lee, Do Hong Kim, Young-Seok Shim et al. "Highly selective and sensitive chemoresistive humidity sensors based on rGO/MoS2 van der Waals composites". Journal of Materials Chemistry A 6, n.º 12 (2018): 5016–24. http://dx.doi.org/10.1039/c7ta11375g.

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25

Mondal, Chiranjit, Sourabh Kumar y Biswarup Pathak. "Topologically protected hybrid states in graphene–stanene–graphene heterojunctions". Journal of Materials Chemistry C 6, n.º 8 (2018): 1920–25. http://dx.doi.org/10.1039/c7tc05212j.

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26

DOBSON, J. F. "ELECTRON DENSITY FUNCTIONAL THEORY". International Journal of Modern Physics B 13, n.º 05n06 (10 de marzo de 1999): 511–23. http://dx.doi.org/10.1142/s0217979299000412.

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A brief summary is given of electronic density functional theory, including recent developments: generalized gradient methods, hybrid functionals, time dependent density functionals and excited states, van der Waals energy functionals.
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27

Rehman, Gul, S. A. Khan, B. Amin, Iftikhar Ahmad, Li-Yong Gan y Muhammad Maqbool. "Intriguing electronic structures and optical properties of two-dimensional van der Waals heterostructures of Zr2CT2 (T = O, F) with MoSe2 and WSe2". Journal of Materials Chemistry C 6, n.º 11 (2018): 2830–39. http://dx.doi.org/10.1039/c7tc05963a.

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Based on (hybrid) first-principles calculations, material properties (structural, electronic, vibrational, optical, and photocatalytic) of van der Waals heterostructures and their corresponding monolayers (transition metal dichalcogenides and MXenes) are investigated.
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28

Sun, Cuicui y Meili Qi. "Hybrid van der Waals heterojunction based on two-dimensional materials". Journal of Physics: Conference Series 2109, n.º 1 (1 de noviembre de 2021): 012012. http://dx.doi.org/10.1088/1742-6596/2109/1/012012.

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Abstract Since the discovery of graphene, two-dimensional (2D) layered materials have always been the focus of material research. The layers of 2D materials are covalent bonds, and the layers are weakly bonded to adjacent layers through van der Waals (vdW) interactions. Since any dangling-bond-free surface could be combined with another material through vdW forces, the concept can be extended. This can refer to the integration of 2D materials with any other non-2D materials through non-covalent interactions. The emerging mixed-dimensional (2D+nD, where n is 0, 1 or 3) heterostructure devices has been studied and represents a wider range of vdW heterostructures. New electronic devices and optoelectronic devices based on such heterojunctions have unique functions. Therefore, this article depicts the research progress of (2D+nD, where n is 0, 1 or 3) vdW heterojunctions based on 2D materials.
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29

Orgiu, Emanuele. "(Invited) Hybrid Van Der Waals Heterostructures: From Fundamentals to Applications". ECS Meeting Abstracts MA2021-01, n.º 12 (30 de mayo de 2021): 592. http://dx.doi.org/10.1149/ma2021-0112592mtgabs.

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30

Lakhina, Olga y Eric S. Swanson. "Hybrid meson potentials and the gluonic van der Waals force". Physics Letters B 582, n.º 3-4 (marzo de 2004): 172–78. http://dx.doi.org/10.1016/j.physletb.2004.01.011.

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31

Orgiu, Emanuele. "(Invited) Hybrid Van Der Waals Heterostructures: From Fundamentals to Applications". ECS Meeting Abstracts MA2020-01, n.º 8 (1 de mayo de 2020): 741. http://dx.doi.org/10.1149/ma2020-018741mtgabs.

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32

Santos, Elton J. G., Declan Scullion, Ximo S. Chu, Duo O. Li, Nathan P. Guisinger y Qing Hua Wang. "Rotational superstructure in van der Waals heterostructure of self-assembled C60 monolayer on the WSe2 surface". Nanoscale 9, n.º 35 (2017): 13245–56. http://dx.doi.org/10.1039/c7nr03951d.

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Hybrid van der Waals (vdW) heterostructures composed of two-dimensional (2D) layered materials and self-assembled organic molecules are promising systems for electronic and optoelectronic applications with enhanced properties and performance.
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33

Chen, Yuxuan, Xinguo Ma, Di Li, Huihu Wang y Chuyun Huang. "Mechanism of enhancing visible-light photocatalytic activity of BiVO4via hybridization of graphene based on a first-principles study". RSC Advances 7, n.º 8 (2017): 4395–401. http://dx.doi.org/10.1039/c6ra25721f.

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The interface properties of the hybrid graphene/BiVO4(001) heterojunction were investigated by first-principle calculations incorporating semiempirical dispersion-correction schemes to describe correctly van der Waals interactions.
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34

Liu, Yibo y Juewen Liu. "Hybrid nanomaterials of WS2 or MoS2 nanosheets with liposomes: biointerfaces and multiplexed drug delivery". Nanoscale 9, n.º 35 (2017): 13187–94. http://dx.doi.org/10.1039/c7nr04199c.

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35

Cai, Baofang, Huan Yin, Tingting Huo, Jun Ma, Zengfeng Di, Ming Li, Nantao Hu, Zhi Yang, Yafei Zhang y Yanjie Su. "Semiconducting single-walled carbon nanotube/graphene van der Waals junctions for highly sensitive all-carbon hybrid humidity sensors". Journal of Materials Chemistry C 8, n.º 10 (2020): 3386–94. http://dx.doi.org/10.1039/c9tc06586e.

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36

Gao, Guoping, Yan Jiao, Fengxian Ma, Yalong Jiao, Eric Waclawik y Aijun Du. "Carbon nanodot decorated graphitic carbon nitride: new insights into the enhanced photocatalytic water splitting from ab initio studies". Physical Chemistry Chemical Physics 17, n.º 46 (2015): 31140–44. http://dx.doi.org/10.1039/c5cp05512a.

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Density functional theory calculations reveal that hybrid carbon nanodots and graphitic carbon nitride can form a type-II van der Waals heterojunction, leading to significant reduction of band gap and enhanced visible light response.
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37

Majumdar, Aniket, Saloni Kakkar, Nivedith Kuttikunnummal Anil, Tathagata Paul, T. Phanindra Sai, Kenji Watanabe, Takashi Taniguchi y Arindam Ghosh. "Probing the charge and heat transfer channels in optically excited graphene — transition metal dichalcogenide hybrids using Johnson noise thermometry". Applied Physics Letters 121, n.º 4 (25 de julio de 2022): 041103. http://dx.doi.org/10.1063/5.0099383.

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Graphene (Gr)–transition metal dichalcogenide (TMDC) hybrids are promising platforms for achieving sensitive and ultra-fast photodetection. The process of photo-detection in such van der Waals hybrids is usually dictated by the formation of excitons followed by the transfer of charge and energy from the TMDC layer to graphene, but they have not been explored simultaneously in the same device before. In this work, we have investigated optically excited Gr–WS2 (tungsten disulfide) heterostructures using both standard electrical transport and Johnson noise thermometry. At large negative gate voltages, the experimentally observed photoresponse cannot be explained from conventional photogating but was found to host an increase in electron temperature as large as [Formula: see text] K. Time dependence of the transport and the noise reveals that the change in temperature and photoresistance can originate from distinct microscopic processes. The findings can be exploited for the development of Gr–TMDC based ultra-fast bolometers.
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38

Tang, Qianying, Fang Zhong, Qing Li, Jialu Weng, Junzhe Li, Hangyu Lu, Haitao Wu et al. "Infrared Photodetection from 2D/3D van der Waals Heterostructures". Nanomaterials 13, n.º 7 (24 de marzo de 2023): 1169. http://dx.doi.org/10.3390/nano13071169.

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An infrared photodetector is a critical component that detects, identifies, and tracks complex targets in a detection system. Infrared photodetectors based on 3D bulk materials are widely applied in national defense, military, communications, and astronomy fields. The complex application environment requires higher performance and multi-dimensional capability. The emergence of 2D materials has brought new possibilities to develop next-generation infrared detectors. However, the inherent thickness limitations and the immature preparation of 2D materials still lead to low quantum efficiency and slow response speeds. This review summarizes 2D/3D hybrid van der Waals heterojunctions for infrared photodetection. First, the physical properties of 2D and 3D materials related to detection capability, including thickness, band gap, absorption band, quantum efficiency, and carrier mobility, are summarized. Then, the primary research progress of 2D/3D infrared detectors is reviewed from performance improvement (broadband, high-responsivity, fast response) and new functional devices (two-color detectors, polarization detectors). Importantly, combining low-doped 3D and flexible 2D materials can effectively improve the responsivity and detection speed due to a significant depletion region width. Furthermore, combining the anisotropic 2D lattice structure and high absorbance of 3D materials provides a new strategy in high-performance polarization detectors. This paper offers prospects for developing 2D/3D high-performance infrared detection technology.
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39

Zhou, Congcong, Xiaodan Li y Taotao Hu. "Structural and Electronic Properties of Heterostructures Composed of Antimonene and Monolayer MoS2". Nanomaterials 10, n.º 12 (27 de noviembre de 2020): 2358. http://dx.doi.org/10.3390/nano10122358.

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Antimonene is found to be a promising material for two-dimensional optoelectronic equipment due to its broad band gap and high carrier mobility. The van der Waals heterostructure, as a unique structural unit for the study of photoelectric properties, has attracted great attention. By using ab initio density functional theory with van der Waals corrections, we theoretically investigated the structural and electronic properties of the heterostructures composed of antimonene and monolayer MoS2. Our results revealed that the Sb/MoS2 hetero-bilayer is an indirect semiconductor with type-II band alignment, which implies the spatial separation of photogenerated electron–hole pairs. Due to the weak van der Waals interlayer interactions between the adjacent sheets of the hetero-bilayer systems, the band structures of isolated antimonene and monolayer MoS2 are preserved. In addition, a tunable band gap in Sb/MoS2 hetero-bilayer can be realized by applying in-plane biaxial compressing/stretching. When antimonene and monolayer MoS2 are stacked into superlattices, the indirect semiconductors turn into direct semiconductors with the decreased band gaps. Our results show that the antimonene-based hybrid structures are good candidate structures for photovoltaic devices.
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40

Jayanand, Kishan y Anupama B. Kaul. "Photodetectors with Buckminsterfullerene Decorated WSe2". Journal of The Electrochemical Society 169, n.º 4 (1 de abril de 2022): 047503. http://dx.doi.org/10.1149/1945-7111/ac6074.

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In this work, we have studied the interactions of van der Waals (vdWs) hybrid structures composed of two-dimensional tungsten diselenide (WSe2) with zero-dimensional buckminsterfullerene (C60) spheres. The organic-inorganic vdWs heterostructure was fabricated using the spin coated dispersion of C60 over monolayer WSe2 crystallites. The morphology of the spin coated C60 on the surface of monolayer (1L) WSe2 was studied using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Raman and photoluminescence spectroscopy were used to reveal the p -type doping of WSe2 by the C60 molecules. Photodetector devices were then fabricated with Ti-contacted electrodes and the photodetector figures of merit for WSe2 and C60-WSe2 hybrids were examined as a function of illumination power and incoming wavelength which showed the C60 decoration of 1L-WSe2 provides an improvement in device performance. Furthermore, the temporal response of the devices was analyzed which showed a reduction in response times by more than two times for the hybrid system. Our results indicate that the C60-WSe2 vdWs hybrid heterostructure appears to be an attractive architecture for enabling charge transfer and high performance photodetection capabilities.
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41

Rosul, Md Golam, Doeon Lee, David H. Olson, Naiming Liu, Xiaoming Wang, Patrick E. Hopkins, Kyusang Lee y Mona Zebarjadi. "Thermionic transport across gold-graphene-WSe2 van der Waals heterostructures". Science Advances 5, n.º 11 (noviembre de 2019): eaax7827. http://dx.doi.org/10.1126/sciadv.aax7827.

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Solid-state thermionic devices based on van der Waals structures were proposed for nanoscale thermal to electrical energy conversion and integrated electronic cooling applications. We study thermionic cooling across gold-graphene-WSe2-graphene-gold structures computationally and experimentally. Graphene and WSe2 layers were stacked, followed by deposition of gold contacts. The I-V curve of the structure suggests near-ohmic contact. A hybrid technique that combines thermoreflectance and cooling curve measurements is used to extract the device ZT. The measured Seebeck coefficient, thermal and electrical conductance, and ZT values at room temperatures are in agreement with the theoretical predictions using first-principles calculations combined with real-space Green’s function formalism. This work lays the foundation for development of efficient thermionic devices.
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42

Hu, Yunsheng, Yihua Bai, Qing Zhang y Yuanjie Yang. "Electrically controlled molecular fingerprint retrieval with van der Waals metasurface". Applied Physics Letters 121, n.º 14 (3 de octubre de 2022): 141701. http://dx.doi.org/10.1063/5.0111940.

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Polaritons in two-dimensional van der Waals (vdW) materials possess extreme light confinement, which have emerged as a potential platform for next-generation biosensing and infrared spectroscopy. Here, we propose an ultra-thin and electric tunable graphene/hexagonal boron nitride/graphene metasurface for detecting molecular fingerprints over a broad spectrum. The vdW metasurface supports hybrid plasmon–phonon polariton resonance with high-quality factor (Q > 120) and electrically controlled broadband spectra tunability from 6.5 to 7 μm. After coating a thin layer of bio-molecular (e.g., CBP) on top of the metasurface, the molecular absorption signatures can be readout at multiple spectral points and, thus, achieve broadband fingerprint retrieval of bio-molecules. Additionally, our electric tunable metasurface works as an integrated graphene-based field-effect transistor device, without the need of multiple resonance generators such as angle-resolved or pixelated dielectric metasurfaces for broadband spectra scanning, thereby paving the way for highly sensitive, miniaturized, and electrically addressed biosensing and infrared spectroscopy.
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43

Akram, Bilal, Bing Ni y Xun Wang. "Van der Waals Integrated Hybrid POM‐Zirconia Flexible Belt‐Like Superstructures". Advanced Materials 32, n.º 2 (27 de noviembre de 2019): 1906794. http://dx.doi.org/10.1002/adma.201906794.

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44

Singh, Kangujam Priyokumar y Mahbubur Rahman Mollah. "Bianchi type III cosmological model with hybrid scale factor in the presence of Van der Waals fluid in Lyra manifold". International Journal of Modern Physics A 33, n.º 35 (20 de diciembre de 2018): 1850207. http://dx.doi.org/10.1142/s0217751x1850207x.

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The search for the existence of Lyra manifold in a hybrid universe interacting with Van der Waals fluid using Bianchi type III metric is presented in this paper. To find the exact cosmological solutions, we use certain physical relations between the metric potentials and the average scale factor is assumed to be [Formula: see text] (see Ref. 1) describing the hybrid character of scale factor with the generation of a model of transitioning phase from early decelerating to the present accelerating universe. In this model, when we investigate further about the role of the Van der Waals fluid with Lyra geometry, interestingly, we found that this universe behaves as one containing with dark energy and at the late stage a part of the dark energy behaves as phantom type. This part being generated by the Lyra manifold itself may be taken as a source of dark energy. Some physical as well as geometrical aspects of the model universe are also presented.
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45

Meftakhutdinov, Ruslan M. y Renat T. Sibatov. "Janus Type Monolayers of S-MoSiN2 Family and Van Der Waals Heterostructures with Graphene: DFT-Based Study". Nanomaterials 12, n.º 21 (5 de noviembre de 2022): 3904. http://dx.doi.org/10.3390/nano12213904.

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Novel representative 2D materials of the Janus type family X-M-ZN2 are studied. These materials are hybrids of a transition metal dichalcogenide and a material from the MoSi2N4 family, and they were constructed and optimized from the MoSi2N4 monolayer by the substitution of SiN2 group on one side by chalcogen atoms (sulfur, selenium, or tellurium), and possibly replacing molybdenum (Mo) to tungsten (W) and/or silicon (Si) to germanium (Ge). The stability of novel materials is evaluated by calculating phonon spectra and binding energies. Mechanical, electronic, and optical characteristics are calculated by methods based on the density functional theory. All considered 2D materials are semiconductors with a substantial bandgap (>1 eV). The mirror symmetry breaking is the cause of a significant built-in electric field and intrinsic dipole moment. The spin–orbit coupling (SOC) is estimated by calculations of SOC polarized bandstructures for four most stable X-M-ZN2 structures. The possible van der Waals heterostructures of considered Janus type monolayers with graphene are constructed and optimized. It is demonstrated that monolayers can serve as outer plates in conducting layers (with graphene) for shielding a constant external electric field.
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46

Yu, Xianbo, Guangyu Zhao, Canlong Wu, Huihuang Huang, Chao Liu, Xiaojie Shen, Ming Wang, Xiaoming Bai y Naiqing Zhang. "Constructing anion vacancy-rich MoSSe/G van der Waals heterostructures for high-performance Mg–Li hybrid-ion batteries". Journal of Materials Chemistry A 9, n.º 40 (2021): 23276–85. http://dx.doi.org/10.1039/d1ta07787b.

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Anion vacancies riched MoSSe and graphene van der Waals heterostructures can reduce the ion diffusion barriers and increase the adsorption energy, thereby greatly enhancing the ion diffusion rate and suppressing the rapid voltage drop in discharge.
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47

He, Chunhui, Qian Zhang, Tingwei Gao, Chenguang Liu, Zhenyu Chen, Cezhou Zhao, Chun Zhao, Richard J. Nichols, Yannick J. Dappe y Li Yang. "Charge transport in hybrid platinum/molecule/graphene single molecule junctions". Physical Chemistry Chemical Physics 22, n.º 24 (2020): 13498–504. http://dx.doi.org/10.1039/d0cp01774d.

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The single molecule conductance of hybrid platinum/alkanedithiol/graphene junctions has been investigated with a focus on understanding the influence of employing two very different contact types, namely the relatively weak van der Waals coupling at the graphene interface and the strong bond dipole at the Pt–S interface.
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48

Lai, Shen, Seongjae Byeon, Sung Kyu Jang, Juho Lee, Byoung Hun Lee, Jin-Hong Park, Yong-Hoon Kim y Sungjoo Lee. "HfO2/HfS2 hybrid heterostructure fabricated via controllable chemical conversion of two-dimensional HfS2". Nanoscale 10, n.º 39 (2018): 18758–66. http://dx.doi.org/10.1039/c8nr06020g.

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We demonstrate that HfO2, a high-K dielectric, can be prepared on the top surface of 2D HfS2 through plasma oxidation, which results in a heterostructure composed of a 2D van der Waals semiconductor and its insulating native oxide.
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49

Huang, Ko-Fan, Önder Gül, Takashi Taniguchi, Kenji Watanabe y Philip Kim. "Andreev reflection between aluminum and graphene across van der Waals barriers". Low Temperature Physics 49, n.º 6 (1 de junio de 2023): 662–69. http://dx.doi.org/10.1063/10.0019423.

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We present planar aluminum superconductor–graphene junctions whose hybrid interface is engineered for couplings ranging from tunneling to the strongly coupled regime by employing an atomically thin van der Waals tunneling barrier. Without the vdW barrier, we find Al makes strongly coupled contacts with the fully proximities graphene channel underneath. Using a large band gap hexagonal boron nitride (hBN) barrier, we find the junctions always remain in the weak coupling regime, exhibiting tunneling characteristics. Using monolayer semi-conducting transition metal dichalcogenides (TMDs) such as MoS2, we realize intermediate coupling with enhanced junction conductance due to the Andreev process. In this intermediate regime, we find that junction resistance changes in discrete steps when sweeping a perpendicular magnetic field. The period of the resistance steps in the magnetic field is inversely proportional to the junction area, suggesting the physical origin of our observations is due to magnetic-field-induced vortex formation in the planar junction.
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50

Laref, Slimane, Bin Wang, Xin Gao y Takashi Gojobori. "Computational Studies of Auto-Active van der Waals Interaction Molecules on Ultra-Thin Black-Phosphorus Film". Molecules 28, n.º 2 (9 de enero de 2023): 681. http://dx.doi.org/10.3390/molecules28020681.

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Using the van der Waals density functional theory, we studied the binding peculiarities of favipiravir (FP) and ebselen (EB) molecules on a monolayer of black phosphorene (BP). We systematically examined the interaction characteristics and thermodynamic properties in a vacuum and a continuum, solvent interface for active drug therapy. These results illustrate that the hybrid molecules are enabled functionalized two-dimensional (2D) complex systems with a vigorous thermostability. We demonstrate in this study that these molecules remain flat on the monolayer BP system and phosphorus atoms are intact. It is inferred that the hybrid FP+EB molecules show larger adsorption energy due to the van der Waals forces and planar electrostatic interactions. The changes in Gibbs free energy at different surface charge fluctuations and temperatures imply that the FP and EB are allowed to adsorb from the gas phase onto the 2D film at high temperatures. Thereby, the results unveiled beneficial inhibitor molecules on two dimensional BP nanocarriers, potentially introducing a modern strategy to enhance the development of advanced materials, biotechnology, and nanomedicine.
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