1
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Nguyen HT, Yen ZL, Su YH, Hsieh YP, Hofmann M. 2D Material-Enabled Optical Rectennas with Ultrastrong Light-Electron Coupling. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2202199. [PMID: 35869608 DOI: 10.1002/smll.202202199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Optical rectennas extend the electromagnetic wave rectification process into the visible regime and provide a route toward high-performance photodetection and energy harvesting. Here, the promise of 2D materials toward on-chip optical rectennas is demonstrated. A self-aligned patterning process yields lateral MIM structures where a nanometer-sized air gap separates a 2D material contact from a metal electrode. This device can be scalably produced in large arrays using established microfabrication techniques. Different from previous approaches, the performance of the 2D rectenna can be adjusted through electrostatic gating. Optimization of the band alignment leads to strong rectification at wavelengths around 500 nm and clear polarization control. Comparison of wavelength-dependent rectenna performance with a photon-assisted tunneling model reveals a tenfold increase in photon-electron coupling over nanotube-based rectennas. The results highlight the potential of 2D material-based rectennas for future quantum computing applications.
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Affiliation(s)
- Hai-Thai Nguyen
- Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Zhi-Long Yen
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Yen-Hsun Su
- Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Ya-Ping Hsieh
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
| | - Mario Hofmann
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
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2
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Miller O, Park K, Vaia RA. Towards maximum optical efficiency of ensembles of colloidal nanorods. OPTICS EXPRESS 2022; 30:25061-25077. [PMID: 36237045 DOI: 10.1364/oe.462926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 06/13/2022] [Indexed: 06/16/2023]
Abstract
Experimental and theoretical studies of colloidal nanoparticles have primarily focused on accurate characterization and simulation of observable characteristics, such as resonant wavelength. In this paper, we tackle the optimal design of colloidal-nanoparticle ensembles: what is the largest possible per-volume optical cross-section, which designs might achieve them, and can such response be experimentally demonstrated? We combine theory and experiment to answer each of these questions. We derive general bounds on the maximum cross-sections per volume, and we apply an analytical antenna model to show that resonant nanorods should nearly achieve such bounds. We use a modified seed-mediated synthesis approach to synthesize ensembles of gold nanorods with small polydispersity, i.e., small variations in size and aspect ratio. Polydispersity is the key determinant of how closely such ensembles can approach their respective bounds yet is difficult to characterize experimentally without near-field measurements. We show that a certain "extinction metric," connecting extinction cross-section per volume with the radiative efficiencies of the nanoparticles, offers a quantitative prediction of polydispersity via quantities that can be rapidly measured with far-field characterization tools. Our predictions apply generally across all plasmonic materials and offer a roadmap to the largest possible optical response of nanoparticle ensembles.
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3
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Park JH, Cho YW, Kim TH. Recent Advances in Surface Plasmon Resonance Sensors for Sensitive Optical Detection of Pathogens. BIOSENSORS 2022; 12:180. [PMID: 35323450 PMCID: PMC8946561 DOI: 10.3390/bios12030180] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/09/2022] [Accepted: 03/11/2022] [Indexed: 05/06/2023]
Abstract
The advancement of science and technology has led to the recent development of highly sensitive pathogen biosensing techniques. The effective treatment of pathogen infections requires sensing technologies to not only be sensitive but also render results in real-time. This review thus summarises the recent advances in optical surface plasmon resonance (SPR) sensor technology, which possesses the aforementioned advantages. Specifically, this technology allows for the detection of specific pathogens by applying nano-sized materials. This review focuses on various nanomaterials that are used to ensure the performance and high selectivity of SPR sensors. This review will undoubtedly accelerate the development of optical biosensing technology, thus allowing for real-time diagnosis and the timely delivery of appropriate treatments as well as preventing the spread of highly contagious pathogens.
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Affiliation(s)
| | | | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, 84 Heukseuk-ro, Dongjak-gu, Seoul 06974, Korea; (J.-H.P.); (Y.-W.C.)
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4
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Shim H, Monticone F, Miller OD. Fundamental Limits to the Refractive Index of Transparent Optical Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2103946. [PMID: 34510577 DOI: 10.1002/adma.202103946] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/26/2021] [Indexed: 06/13/2023]
Abstract
Increasing the refractive index available for optical and nanophotonic systems opens new vistas for design, for applications ranging from broadband metalenses to ultrathin photovoltaics to high-quality-factor resonators. In this work, fundamental limits to the refractive index of any material are derived, given only the underlying electron density and either the maximum allowable dispersion or the minimum bandwidth of interest. In the realm of small to modest dispersion, the bounds are closely approached and not surpassed by a wide range of natural materials, showing that nature has already nearly reached a Pareto frontier for refractive index and dispersion. Conversely, for narrow-bandwidth applications, nature does not provide the highly dispersive, high-index materials that the bounds suggest should be possible. The theory of composites to identify metal-based metamaterials that can exhibit small losses and sizeable increases in refractive index over the current best materials is used. Moreover, if the "elusive lossless metal" can be synthesized, it is shown that it would enable arbitrarily high refractive index in the high-dispersion regime, nearly achieving the bounds even at refractive indices of 100 and beyond at optical frequencies.
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Affiliation(s)
- Hyungki Shim
- Department of Applied Physics and Energy Sciences Institute, Yale University, New Haven, CT, 06511, USA
- Department of Physics, Yale University, New Haven, CT, 06511, USA
| | - Francesco Monticone
- School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Owen D Miller
- Department of Applied Physics and Energy Sciences Institute, Yale University, New Haven, CT, 06511, USA
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5
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Katoch N, Kumar A, Kumar J, Ahluwalia PK, Pandey R. Electronic and optical properties of boron-based hybrid monolayers. NANOTECHNOLOGY 2021; 32:415203. [PMID: 34167107 DOI: 10.1088/1361-6528/ac0e69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 06/23/2021] [Indexed: 06/13/2023]
Abstract
Anisotropic 2D Dirac cone materials are important for the fabrication of nanodevices having direction-dependent characteristics since the anisotropic Dirac cones lead to different values of Fermi velocities yielding variable carrier concentrations. In this work, the feasibility of the B-based hybrid monolayers BX (X = As, Sb, and Bi), as anisotropic Dirac cone materials is investigated. Calculations based on density functional theory and molecular dynamics method find the stability of these monolayers exhibiting unique electronic properties. For example, the BAs monolayer possesses a robust self-doping feature, whereas the BSb monolayer carries the intrinsic charge carrier concentration of the order of 1012cm-2which is comparable to that of graphene. Moreover, the direction-dependent optical response is predicted in these B-based monolayers; a high IR response in thex-direction is accompanied with that in the visible region along they-direction. The results are, therefore, expected to help in realizing the B-based devices for nanoscale applications.
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Affiliation(s)
- Neha Katoch
- Department of Physics and Astronomical Science, School of Physical and Material Sciences, Central University of Himachal Pradesh, Dharamshala, 176206, India
| | - Ashok Kumar
- Department of Physics, School of Basic Sciences, Central University of Punjab, Bathinda, 151401, India
| | - Jagdish Kumar
- Department of Physics and Astronomical Science, School of Physical and Material Sciences, Central University of Himachal Pradesh, Dharamshala, 176206, India
| | - P K Ahluwalia
- Department of Physics, Himachal Pradesh University, Shimla, 171005, India
| | - Ravindra Pandey
- Department of Physics, Michigan Technological University, Houghton, MI 49931, United States of America
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6
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Song J, Cheng Q, Zhang B, Lu L, Zhou X, Luo Z, Hu R. Many-body near-field radiative heat transfer: methods, functionalities and applications. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2021; 84:036501. [PMID: 33567420 DOI: 10.1088/1361-6633/abe52b] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
Near-field radiative heat transfer (NFRHT) governed by evanescent waves, provides a platform to thoroughly understand the transport behavior of nonradiative photons, and also has great potential in high-efficiency energy harvesting and thermal management at the nanoscale. It is more usual in nature that objects participate in heat transfer process in many-body form rather than the frequently-considered two-body scenarios, and the inborn mutual interactions among objects are important to be understood and utilized for practical applications. The last decade has witnessed considerable achievements on many-body NFRHT, ranging from the establishment of different calculation methods to various unprecedented heat transport phenomena that are distinct from two-body systems. In this invited review, we introduce concisely the basic physics of NFRHT, lay out various theoretical methods to deal with many-body NFRHT, and highlight unique functionalities realized in many-body systems and the resulting applications. At last, the key challenges and opportunities of many-body NFRHT in terms of fundamental physics, experimental validations, and potential applications are outlined and discussed.
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Affiliation(s)
- Jinlin Song
- School of Electrical and Information Engineering, Wuhan Institute of Technology, Wuhan 430025, Hubei, People's Republic of China
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Qiang Cheng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Bo Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Lu Lu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Xinping Zhou
- School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Zixue Luo
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Run Hu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
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7
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Angeris G, Vučković J, Boyd S. Heuristic methods and performance bounds for photonic design. OPTICS EXPRESS 2021; 29:2827-2854. [PMID: 33726472 DOI: 10.1364/oe.415052] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 12/25/2020] [Indexed: 06/12/2023]
Abstract
In the photonic design problem, a scientist or engineer chooses the physical parameters of a device to best match some desired device behavior. Many instances of the photonic design problem can be naturally stated as a mathematical optimization problem that is computationally difficult to solve globally. Because of this, several heuristic methods have been developed to approximately solve such problems. These methods often produce very good designs, and, in many practical applications, easily outperform 'traditional' designs that rely on human intuition. Yet, because these heuristic methods do not guarantee that the approximate solution found is globally optimal, the question remains of just how much better a designer might hope to do. This question is addressed by performance bounds or impossibility results, which determine a performance level that no design can achieve. We focus on algorithmic performance bounds, which involve substantial computation to determine. We illustrate a variety of both heuristic methods and performance bounds on two examples. In these examples (and many others not reported here) the performance bounds show that the heuristic designs are nearly optimal, and can be considered globally optimal in practice. This review serves to clearly set up the photonic design problem and unify existing approaches for calculating performance bounds, while also providing some natural generalizations and properties.
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8
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Kuang Z, Miller OD. Computational Bounds to Light-Matter Interactions via Local Conservation Laws. PHYSICAL REVIEW LETTERS 2020; 125:263607. [PMID: 33449774 DOI: 10.1103/physrevlett.125.263607] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
We develop a computational framework for identifying bounds to light-matter interactions, originating from polarization-current-based formulations of local conservation laws embedded in Maxwell's equations. We propose an iterative method for imposing only the maximally violated constraints, enabling rapid convergence to global bounds. Our framework can identify bounds to the minimum size of any scatterer that encodes a specific linear operator, given only its material properties, as we demonstrate for the optical computation of a discrete Fourier transform. It further resolves bounds on far-field scattering properties over any arbitrary bandwidth, where previous bounds diverge.
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Affiliation(s)
- Zeyu Kuang
- Department of Applied Physics and Energy Sciences Institute, Yale University, New Haven, Connecticut 06511, USA
| | - Owen D Miller
- Department of Applied Physics and Energy Sciences Institute, Yale University, New Haven, Connecticut 06511, USA
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9
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Design and Characterization of Ag@Cu2O-rGO Nanocomposite for the p-Nitrophenol Reduction. Catalysts 2020. [DOI: 10.3390/catal11010043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In this paper, we designed Ag nanoparticles coated with a Cu2O shell, which was successfully decorated on reduced graphene oxide (rGO) via a solid-state self-reduction. The Cu2O, Ag@Cu2O, and Ag@Cu2O-rGO nanocomposites were synthesized and characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–Vis, and XPS to evaluate the properties of the composites. In order to compare the chemical catalytic activity, the Cu2O, Ag@Cu2O, and Ag@Cu2O-rGO nanocomposites were employed for the catalytic reduction of p-nitrophenol (4-NP) into p-aminophenol (4-AP) in aqueous solution. The Ag@Cu2O-rGO nanocomposite exhibited excellent catalytic activity due to the intense interaction and high degree of electron transfer among Ag, Cu2O, and rGO. The rGO acted as the platform to bridge the isolated nanoparticles; furthermore, the electrons could quickly transfer from the Ag core to the Cu2O shell, which improved the chemical catalytic efficiency.
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10
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Yao W, Benzaouia M, Miller OD, Johnson SG. Approaching the upper limits of the local density of states via optimized metallic cavities. OPTICS EXPRESS 2020; 28:24185-24197. [PMID: 32752402 DOI: 10.1364/oe.397502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
By computational optimization of air-void cavities in metallic substrates, we show that the local density of states (LDOS) can reach within a factor of ≈10 of recent theoretical upper limits and within a factor ≈4 for the single-polarization LDOS, demonstrating that the theoretical limits are nearly attainable. Optimizing the total LDOS results in a spontaneous symmetry breaking where it is preferable to couple to a specific polarization. Moreover, simple shapes such as optimized cylinders attain nearly the performance of complicated many-parameter optima, suggesting that only one or two key parameters matter in order to approach the theoretical LDOS bounds for metallic resonators.
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11
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Chung H, Miller OD. High-NA achromatic metalenses by inverse design. OPTICS EXPRESS 2020; 28:6945-6965. [PMID: 32225932 DOI: 10.1364/oe.385440] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We use inverse design to discover metalens structures that exhibit broadband, achromatic focusing across low, moderate, and high numerical apertures. We show that standard unit-cell approaches cannot achieve high-efficiency high-NA focusing, even at a single frequency, due to the incompleteness of the unit-cell basis, and we provide computational upper bounds on their maximum efficiencies. At low NA, our devices exhibit the highest theoretical efficiencies to date. At high NA-of 0.9 with translation-invariant films and of 0.99 with "freeform" structures-our designs are the first to exhibit achromatic high-NA focusing.
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12
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Liu ZL, Lei B, Zhu ZL, Tao L, Qi J, Bao DL, Wu X, Huang L, Zhang YY, Lin X, Wang YL, Du S, Pantelides ST, Gao HJ. Spontaneous Formation of 1D Pattern in Monolayer VSe 2 with Dispersive Adsorption of Pt Atoms for HER Catalysis. NANO LETTERS 2019; 19:4897-4903. [PMID: 30973231 DOI: 10.1021/acs.nanolett.9b00889] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Creation of functional patterns in two-dimensional (2D) materials provides opportunities to extend their potential for applications. Transition-metal dichalcogenides (TMDCs) are suitable 2D materials for pattern generation because of properties including alterable polymorphic phases, easy chalcogen-vacancy formation, metal-atom insertion, and alloying. Such patterning can be used for selective functionalization. Here we report the spontaneous formation of long-range, well-ordered 1D patterns in monolayer vanadium diselenide (VSe2) by a single annealing stage during growth. Atomic-resolution images in real space combined with density-functional-theory (DFT) calculations reveal the 1D features of patterned VSe2. Further experimental characterization of the intermediate states in the growth process confirm the spontaneous formation of the 1D pattern by annealing-induced Se-deficient linear defects. The 1D pattern can be reversibly transformed to homogenous VSe2 monolayer by reintroducing Se atoms. Moreover, additional experiments demonstrate that a dispersive deposition of Pt atoms along the 1D structures of patterned VSe2 is achieved, while DFT calculations find that their catalytic activity for hydrogen evolution reaction (HER) is as good as that of Pt surfaces. The formation of long-range, well-ordered 1D patterns not only demonstrates an effective way of dimension modulation in 2D materials but also enriches the potential of intrinsically patterned 2D materials for promising catalytic activities.
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Affiliation(s)
- Zhong-Liu Liu
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
| | - Bao Lei
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
| | - Zhi-Li Zhu
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
| | - Lei Tao
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- Department of Physics and Astronomy , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Jing Qi
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
| | - De-Liang Bao
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- Department of Physics and Astronomy , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Xu Wu
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
| | - Li Huang
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
| | - Yu-Yang Zhang
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- CAS Center for Excellence in Topological Quantum Computation , Beijing 100049 , China
| | - Xiao Lin
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- CAS Center for Excellence in Topological Quantum Computation , Beijing 100049 , China
| | - Ye-Liang Wang
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- School of Information and Electronics , Beijing Institute of Technology , Beijing 100081 , China
- CAS Center for Excellence in Topological Quantum Computation , Beijing 100049 , China
| | - Shixuan Du
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- CAS Center for Excellence in Topological Quantum Computation , Beijing 100049 , China
| | - Sokrates T Pantelides
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- Department of Physics and Astronomy , Vanderbilt University , Nashville , Tennessee 37235 , United States
| | - Hong-Jun Gao
- Institute of Physics and University of Chinese Academy of Sciences , Chinese Academy of Sciences , Beijing 100190 , China
- CAS Center for Excellence in Topological Quantum Computation , Beijing 100049 , China
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13
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Wang Y, qi R, Jiang Y, Sun C, Zhang G, Hu Y, Yang ZD, Li W. Transport and Photoelectric Properties of 2D Silicene/MX 2 (M = Mo, W; X = S, Se) Heterostructures. ACS OMEGA 2018; 3:13251-13262. [PMID: 31458043 PMCID: PMC6644475 DOI: 10.1021/acsomega.8b01282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 09/10/2018] [Indexed: 06/10/2023]
Abstract
The transport and photoelectric properties of four two-dimensional (2D) silicene/MX2 (M = Mo, W; X = S, Se) heterostructures have been investigated by employing density functional theory, nonequilibrium Green's function, and Keldysh nonequilibrium Green's function methods. The stabilities of silicene (SiE) are obviously improved after being placed on the MX2 (M = Mo, W; X = S, Se) substrates. In particular, the conductivities of SiE/MX2 are enhanced compared with free-standing SiE and MX2. Moreover, the conductivities are increased with the group number of X, i.e., in the order of SiE < SiE/MS2 < SiE/MSe2. An evident current oscillation phenomenon is observed in the SiE/WX2 heterostructures. When a linear light illumination is applied, SiE/MSe2 shows a stronger photoresponse than SiE/MS2. The maximum photoresponse with a value of 9.0a 0 2/photon was obtained for SiE/WSe2. More importantly, SiE/MS2 (M = Mo, W) heterostructures are good candidates for application in designing solar cells owing to the well spatial separation of the charge carriers. This work provides some clues for further exploring 2D SiE/MX2 heterostructures involving tailored photoelectric properties.
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Affiliation(s)
- Yuxiu Wang
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Rui qi
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Yingjie Jiang
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Cuicui Sun
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Guiling Zhang
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Yangyang Hu
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Zhao-Di Yang
- School of Materials
Science and Engineering, Harbin University
of Science and Technology, Harbin 150080, China
| | - Weiqi Li
- Department of Physics, Harbin
Institute of Technology, Harbin 150001, China
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14
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Guo S, Wang Y, Zhang F, Gao R, Liu M, Dong L, Liu Y, Zhang Y, Chen L. In Situ Synthesis of Ag@Cu₂O-rGO Architecture for Strong Light-Matter Interactions. NANOMATERIALS 2018; 8:nano8060444. [PMID: 29914218 PMCID: PMC6027245 DOI: 10.3390/nano8060444] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/11/2018] [Accepted: 06/12/2018] [Indexed: 11/16/2022]
Abstract
Emerging opportunities based on two-dimensional (2D) layered structures can utilize a variety of complex geometric architectures. Herein, we report the synthesis and properties of a 2D+0D unique ternary platform-core-shell nanostructure, termed Ag@Cu₂O-rGO, where the reduced graphene oxide (rGO) 2D acting as a platform is uniformly decorated by Ag@Cu₂O core-shell nanoparticles. Cu₂O nanoparticles occupy the defect positions on the surface of the rGO platform and restore the conjugation of the rGO structure, which contributes to the significant decrease of the ID/IG intensity ratio. The rGO platform can not only bridge the isolated nanoparticles together but also can quickly transfer the free electrons arising from the Ag core to the Cu₂O shell to improve the utilization efficiency of photogenerated electrons, as is verified by high efficient photocatalytic activity of Methyl Orange (MO). The multi-interface coupling of the Ag@Cu₂O-rGO platform-core-shell nanostructure leads to the decrease of the bandgap with an increase of the Cu₂O shell thickness, which broadens the absorption range of the visible light spectrum.
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Affiliation(s)
- Shuang Guo
- College of Physics, Jilin Normal University, Siping 136000, China.
- Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, Jilin Normal University, Changchun 130103, China.
| | - Yaxin Wang
- College of Physics, Jilin Normal University, Siping 136000, China.
| | - Fan Zhang
- College of Physics, Jilin Normal University, Siping 136000, China.
| | - Renxian Gao
- College of Physics, Jilin Normal University, Siping 136000, China.
| | - Maomao Liu
- College of Physics, Jilin Normal University, Siping 136000, China.
| | - Lirong Dong
- College of Physics, Jilin Normal University, Siping 136000, China.
| | - Yang Liu
- Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, Jilin Normal University, Changchun 130103, China.
| | - Yongjun Zhang
- Key Laboratory of Functional Materials Physics and Chemistry, Ministry of Education, Jilin Normal University, Changchun 130103, China.
| | - Lei Chen
- College of Chemistry, Jilin Normal University, Siping 136000, China.
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15
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Liu ZL, Wu X, Shao Y, Qi J, Cao Y, Huang L, Liu C, Wang JO, Zheng Q, Zhu ZL, Ibrahim K, Wang YL, Gao HJ. Epitaxially grown monolayer VSe 2: an air-stable magnetic two-dimensional material with low work function at edges. Sci Bull (Beijing) 2018; 63:419-425. [PMID: 36658936 DOI: 10.1016/j.scib.2018.03.008] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 03/07/2018] [Accepted: 03/09/2018] [Indexed: 01/21/2023]
Abstract
Recent experimental breakthroughs open up new opportunities for magnetism in few-atomic-layer two-dimensional (2D) materials, which makes fabrication of new magnetic 2D materials a fascinating issue. Here, we report the growth of monolayer VSe2 by molecular beam epitaxy (MBE) method. Electronic properties measurements by scanning tunneling spectroscopy (STS) method revealed that the as-grown monolayer VSe2 has magnetic characteristic peaks in its electronic density of states and a lower work-function at its edges. Moreover, air exposure experiments show air-stability of the monolayer VSe2. This high-quality monolayer VSe2, a very air-inert 2D material with magnetism and low edge work function, is promising for applications in developing next-generation low power-consumption, high efficiency spintronic devices and new electrocatalysts.
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Affiliation(s)
- Zhong-Liu Liu
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Xu Wu
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Yan Shao
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Jing Qi
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Yun Cao
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Li Huang
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Chen Liu
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jia-Ou Wang
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Qi Zheng
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhi-Li Zhu
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China
| | - Kurash Ibrahim
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Ye-Liang Wang
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China; CAS Center for Excellence in Topological Quantum Computation, Beijing 100049, China.
| | - Hong-Jun Gao
- Institute of Physics and University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China; CAS Center for Excellence in Topological Quantum Computation, Beijing 100049, China.
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16
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Ilic O, Thomas NH, Christensen T, Sherrott MC, Soljačić M, Minnich AJ, Miller OD, Atwater HA. Active Radiative Thermal Switching with Graphene Plasmon Resonators. ACS NANO 2018; 12:2474-2481. [PMID: 29529374 DOI: 10.1021/acsnano.7b08231] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We theoretically demonstrate a near-field radiative thermal switch based on thermally excited surface plasmons in graphene resonators. The high tunability of graphene enables substantial modulation of near-field radiative heat transfer, which, when combined with the use of resonant structures, overcomes the intrinsically broadband nature of thermal radiation. In canonical geometries, we use nonlinear optimization to show that stacked graphene sheets offer improved heat conductance contrast between "ON" and "OFF" switching states and that a >10× higher modulation is achieved between isolated graphene resonators than for parallel graphene sheets. In all cases, we find that carrier mobility is a crucial parameter for the performance of a radiative thermal switch. Furthermore, we derive shape-agnostic analytical approximations for the resonant heat transfer that provide general scaling laws and allow for direct comparison between different resonator geometries dominated by a single mode. The presented scheme is relevant for active thermal management and energy harvesting as well as probing excited-state dynamics at the nanoscale.
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Affiliation(s)
| | | | - Thomas Christensen
- Department of Physics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | | | - Marin Soljačić
- Department of Physics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | | | - Owen D Miller
- Department of Applied Physics and Energy Sciences Institute , Yale University , New Haven , Connecticut 06511 , United States
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17
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Mogulkoc A, Mogulkoc Y, Kecik D, Durgun E. The effect of strain and functionalization on the optical properties of borophene. Phys Chem Chem Phys 2018; 20:21043-21050. [DOI: 10.1039/c8cp03594f] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The variation of the optical properties of borophene by applying strain and surface functionalization is revealed.
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Affiliation(s)
- A. Mogulkoc
- Department of Physics
- Faculty of Sciences
- Ankara University
- Ankara
- Turkey
| | - Y. Mogulkoc
- Department of Physics Engineering
- Faculty of Engineering
- Ankara University
- Ankara
- Turkey
| | - D. Kecik
- UNAM – National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology
- Bilkent University
- Ankara
- Turkey
- Department of Physics
| | - E. Durgun
- UNAM – National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology
- Bilkent University
- Ankara
- Turkey
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