1
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Sarker M, Dobner C, Zahl P, Fiankor C, Zhang J, Saxena A, Aluru N, Enders A, Sinitskii A. Porous Nanographenes, Graphene Nanoribbons, and Nanoporous Graphene Selectively Synthesized from the Same Molecular Precursor. J Am Chem Soc 2024; 146:14453-14467. [PMID: 38747845 DOI: 10.1021/jacs.3c10842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
We demonstrate a family of molecular precursors based on 7,10-dibromo-triphenylenes that can selectively produce different varieties of atomically precise porous graphene nanomaterials through the use of different synthetic environments. Upon Yamamoto polymerization of these molecules in solution, the free rotations of the triphenylene units around the C-C bonds result in the formation of cyclotrimers in high yields. In contrast, in on-surface polymerization of the same molecules on Au(111) these rotations are impeded, and the coupling proceeds toward the formation of long polymer chains. These chains can then be converted to porous graphene nanoribbons (pGNRs) by annealing. Correspondingly, the solution-synthesized cyclotrimers can also be deposited onto Au(111) and converted into porous nanographenes (pNGs) via thermal treatment. Thus, both processes start with the same molecular precursor and end with a porous graphene nanomaterial on Au(111), but the type of product, pNG or pGNR, depends on the specific coupling approach. We also produced extended nanoporous graphenes (NPGs) through the lateral fusion of highly aligned pGNRs on Au(111) that were grown at high coverage. The pNGs can also be synthesized directly in solution by Scholl oxidative cyclodehydrogenation of cyclotrimers. We demonstrate the generality of this approach by synthesizing two varieties of 7,10-dibromo-triphenylenes that selectively produced six nanoporous products with different dimensionalities. The basic 7,10-dibromo-triphenylene monomer is amenable to structural modifications, potentially providing access to many new porous graphene nanomaterials. We show that by constructing different porous structures from the same building blocks, it is possible to tune the energy band gap in a wide range.
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Affiliation(s)
- Mamun Sarker
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, Nebraska 68588, United States
| | - Christoph Dobner
- Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
| | - Percy Zahl
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Christian Fiankor
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, Nebraska 68588, United States
| | - Jian Zhang
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, Nebraska 68588, United States
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Anshul Saxena
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Narayana Aluru
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Axel Enders
- Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
| | - Alexander Sinitskii
- Department of Chemistry, University of Nebraska - Lincoln, Lincoln, Nebraska 68588, United States
- Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Lincoln, Nebraska 68588, United States
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2
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Xiao MX, Shao X, Song HY, Li Z, An MR, He C. Tunable band gaps and high carrier mobilities in stanene by small organic molecule adsorption under external electric fields. Phys Chem Chem Phys 2021; 23:16023-16032. [PMID: 34286764 DOI: 10.1039/d1cp01582f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of small organic molecule (SOM) adsorption with benzene (C6H6), hexafluorobenzene (C6F6), and p-difluorobenzene (C6H4F2) on the electronic properties of stanene under external electric fields are investigated through first-principles calculations. Different adsorption sites and molecular orientations are considered to determine the most stable configurations of small organic molecule (SOM) adsorption on the surface of stanene. The results show that the internal electric field caused by the adsorption of small organic molecules destroys the symmetry of the two sublattices of stanene in C6H6/stanene, C6F6/stanene and C6H4F2/stanene systems with the most stable configurations, opening the band gaps of stanene with 39.5, 18.9 and 14.5 meV, respectively. Under an external electric field, a wide range of linearly tunable and sizable direct band gaps (31.6-420.1 meV for the C6H6/stanene system, 14.8-587.2 meV for the C6F6/stanene system and 14.5-490.2 meV for the C6H4F2/stanene system) are merely determined by the strength of the composite electric field despite its direction. The mechanism of charge transfer between stanene and organic molecules under an external electric field can be revealed using an equivalent capacitor model to explain the tunable charge transfer. More importantly, the high carrier mobility of the stable SOM/stanene systems under an external electric field is largely retained due to the weak interactions at the interface. These results indicate that the electronic properties of stanene can be effectively modulated by the surface adsorption of organic molecules under an external electric field, providing effective and reversible routes to enhance the performance of stanene for novel electronic devices in the future.
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Affiliation(s)
- Mei-Xia Xiao
- School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China.
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3
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Raghavan A, Sarkar S, Nagappagari LR, Bojja S, MuthukondaVenkatakrishnan S, Ghosh S. Decoration of Graphene Quantum Dots on TiO2 Nanostructures: Photosensitizer and Cocatalyst Role for Enhanced Hydrogen Generation. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01663] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Akshaya Raghavan
- Polymers and Functional Materials Division, CSIR-IICT, Hyderabad 500007, T.S., India
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi 110001, India
| | - Suprabhat Sarkar
- Polymers and Functional Materials Division, CSIR-IICT, Hyderabad 500007, T.S., India
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi 110001, India
| | - Lakshmana Reddy Nagappagari
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science and Nanotechnology, Yogi Vemana University, Kadapa 516005, Andhra Pradesh, India
- Department of Energy Chemical Engineering, School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, 37224 Sangju, Republic of Korea
| | - Sreedhar Bojja
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi 110001, India
- Analytical Division, CSIR-IICT, Hyderabad 500007, T.S., India
| | - Shankar MuthukondaVenkatakrishnan
- Nanocatalysis and Solar Fuels Research Laboratory, Department of Materials Science and Nanotechnology, Yogi Vemana University, Kadapa 516005, Andhra Pradesh, India
| | - Sutapa Ghosh
- Polymers and Functional Materials Division, CSIR-IICT, Hyderabad 500007, T.S., India
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi 110001, India
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Abstract
We have studied how water modifies the surface of graphene and in particular how the surface conductivity of graphene is affected. According to the literature, two types of interactions should be distinguished: physical, where a water molecule remains intact and is located at some distance from the mesh, and chemical, where a water molecule is imbricated in the graphene bond structure. We have developed theoretical models for both types of interactions using the density functional theory (DFT) with the B3LYP hybrid functional combined with the 6-31G(d) basis set. Our calculations show that the surface conductivity of graphene is reduced in the presence of water.
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6
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Zhang W, Zhao J, He W, Luan L, He C. Enhanced hydrophilic and conductive properties of blue phosphorene doped with Si atom. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.02.078] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Zhang X, Zheng Y, Zhou J, Zheng W, Chen D. Nitrogen doped graphite felt decorated with porous Ni1.4Co1.6S4 nanosheets for 3D pseudocapacitor electrodes. RSC Adv 2017. [DOI: 10.1039/c6ra28083h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
High performance 3D pseudocapacitor electrodes consisting of a nitrogen doped graphite felt (NGF) substrate and porous Ni1.4Co1.6S4 nanosheets has been successfully prepared via a facile hydrothermal reaction.
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Affiliation(s)
- Xiang Zhang
- College of Materials Science and Engineering
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Yuying Zheng
- College of Materials Science and Engineering
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Jun Zhou
- College of Materials Science and Engineering
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Wenqing Zheng
- College of Materials Science and Engineering
- Fuzhou University
- Fuzhou 350116
- P. R. China
| | - Dongyang Chen
- College of Materials Science and Engineering
- Fuzhou University
- Fuzhou 350116
- P. R. China
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8
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Goyal D, Kumar S, Shukla A, Kumar R. Origin of multiple band gap values in single width nanoribbons. Sci Rep 2016; 6:36168. [PMID: 27808172 PMCID: PMC5093554 DOI: 10.1038/srep36168] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 10/07/2016] [Indexed: 11/22/2022] Open
Abstract
Deterministic band gap in quasi-one-dimensional nanoribbons is prerequisite for their integrated functionalities in high performance molecular-electronics based devices. However, multiple band gaps commonly observed in graphene nanoribbons of the same width, fabricated in same slot of experiments, remain unresolved, and raise a critical concern over scalable production of pristine and/or hetero-structure nanoribbons with deterministic properties and functionalities for plethora of applications. Here, we show that a modification in the depth of potential wells in the periodic direction of a supercell on relative shifting of passivating atoms at the edges is the origin of multiple band gap values in nanoribbons of the same width in a crystallographic orientation, although they carry practically the same ground state energy. The results are similar when calculations are extended from planar graphene to buckled silicene nanoribbons. Thus, the findings facilitate tuning of the electronic properties of quasi-one-dimensional materials such as bio-molecular chains, organic and inorganic nanoribbons by performing edge engineering.
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Affiliation(s)
- Deepika Goyal
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar-140001, India
| | - Shailesh Kumar
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Alok Shukla
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Rakesh Kumar
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar-140001, India
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9
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Edge or interface effect on bandgap openings in graphene nanostructures: A thermodynamic approach. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.06.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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11
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Yu X, Dong Z, Liu Y, Liu T, Tao J, Zeng Y, Yang JKW, Wang QJ. A high performance, visible to mid-infrared photodetector based on graphene nanoribbons passivated with HfO2. NANOSCALE 2016; 8:327-32. [PMID: 26610363 DOI: 10.1039/c5nr06869j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Graphene has drawn tremendous attention as a promising candidate for electronic and optoelectronic applications owing to its extraordinary properties, such as broadband absorption and ultrahigh mobility. Nevertheless, the absence of a bandgap makes graphene unfavorable for digital electronic or photonic applications. Although patterning graphene into nanostructures with the quantum confinement effect is able to open a bandgap, devices based on these graphene nanostructures generally suffer from low carrier mobility and scattering losses. In this paper, we demonstrated that encapsulation of an atomic layer deposited high-quality HfO2 film will greatly enhance the carrier mobility and decrease the scattering losses of graphene nanoribbons, because this high-k dielectric layer weakens carrier coulombic interactions. In addition, a photodetector based on HfO2 layer capped graphene nanoribbons can cover broadband wavelengths from visible to mid-infrared at room temperature, exhibiting ∼10 times higher responsivity than the one without a HfO2 layer in the visible regime and ∼8 times higher responsivity in the mid-infrared regime. The method employed here could be potentially used as a general approach to improve the performance of graphene nanostructures for electronic and optoelectronic applications.
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Affiliation(s)
- Xuechao Yu
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
| | - Zhaogang Dong
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore
| | - Yanping Liu
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
| | - Tao Liu
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
| | - Jin Tao
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
| | - Yongquan Zeng
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
| | - Joel K W Yang
- Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore and Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore
| | - Qi Jie Wang
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore and Centre for Disruptive Photonics Technologies, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
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12
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Jia TT, Zheng MM, Fan XY, Su Y, Li SJ, Liu HY, Chen G, Kawazoe Y. Dirac cone move and bandgap on/off switching of graphene superlattice. Sci Rep 2016; 6:18869. [PMID: 26732904 PMCID: PMC4702062 DOI: 10.1038/srep18869] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 11/30/2015] [Indexed: 11/17/2022] Open
Abstract
Using the density functional theory with generalized gradient approximation, we have studied in detail the cooperative effects of degenerate perturbation and uniaxial strain on bandgap opening in graphene. The uniaxial strain could split π bands into πa and πz bands with an energy interval Es to move the Dirac cone. The inversion symmetry preserved antidot would then further split the πa (πz) bands into πa1 (πz1) and πa2 (πz2) bands with an energy interval Ed, which accounts for the bandgap opening in a kind of superlattices with Dirac cone being folded to Γ point. However, such antidot would not affect the semimetal nature of the other superlattices, showing a novel mechanism for bandstructure engineering as compared to the sublattice-equivalence breaking. For a superlattice with bandgap of ~Ed opened at Γ point, the Es could be increased by strengthening strain to close the bandgap, suggesting a reversible switch between the high velocity properties of massless Fermions attributed to the linear dispersion relation around Dirac cone and the high on/off ratio properties associated with the sizable bandgap. Moreover, the gap width actually could be continuously tuned by controlling the strain, showing attractive application potentials.
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Affiliation(s)
- Tian-Tian Jia
- Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China
| | - Meng-Meng Zheng
- Shandong Provincial Key Laboratory of Laser Polarization and Information Technology and Department of Physics, Qufu Normal University, Qufu, Shandong 273165, P. R. China
| | - Xin-Yu Fan
- Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China
| | - Yan Su
- Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China
| | - Shu-Juan Li
- Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China
| | - Hai-Ying Liu
- Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China
| | - Gang Chen
- Laboratory of Advanced Materials Physics and Nanodevices, School of Physics and Technology, University of Jinan, Jinan, Shandong 250022, P. R. China
| | - Yoshiyuki Kawazoe
- New Industry Creation Hatchery Center, Tohoku University, Sendai, Miyagi 980-8577, Japan.,Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk 630090, Russia
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13
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Photocurrent generation in lateral graphene p-n junction created by electron-beam irradiation. Sci Rep 2015; 5:12014. [PMID: 26152225 PMCID: PMC4495417 DOI: 10.1038/srep12014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 05/15/2015] [Indexed: 12/04/2022] Open
Abstract
Graphene has been considered as an attractive material for optoelectronic applications such as photodetectors owing to its extraordinary properties, e.g. broadband absorption and ultrahigh mobility. However, challenges still remain in fundamental and practical aspects of the conventional graphene photodetectors which normally rely on the photoconductive mode of operation which has the drawback of e.g. high dark current. Here, we demonstrated the photovoltaic mode operation in graphene p-n junctions fabricated by a simple but effective electron irradiation method that induces n-type doping in intrinsic p-type graphene. The physical mechanism of the junction formation is owing to the substrate gating effect caused by electron irradiation. Photoresponse was obtained for this type of photodetector because the photoexcited electron-hole pairs can be separated in the graphene p-n junction by the built-in potential. The fabricated graphene p-n junction photodetectors exhibit a high detectivity up to ~3 × 1010 Jones (cm Hz1/2 W−1) at room temperature, which is on a par with that of the traditional III–V photodetectors. The demonstrated novel and simple scheme for obtaining graphene p-n junctions can be used for other optoelectronic devices such as solar cells and be applied to other two dimensional materials based devices.
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14
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Song Y, Feng M, Zhan H. Geometry-dependent electrochemistry of graphene oxide family. Electrochem commun 2015. [DOI: 10.1016/j.elecom.2015.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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15
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Zhang WX, Li T, Gong SB, He C, Duan L. Tuning the electronic and magnetic properties of graphene-like AlN nanosheets by surface functionalization and thickness. Phys Chem Chem Phys 2015; 17:10919-24. [DOI: 10.1039/c5cp00123d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Semiconductor → half-metal → metal transition with nonmagnetic → magnetic transfer can be achieved for AlN nanosheets by surface hydrogenation and increasing nanosheet thickness.
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Affiliation(s)
- W. X. Zhang
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
| | - T. Li
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
| | - S. B. Gong
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
| | - C. He
- State Key Laboratory for Mechanical Behavior of Materials
- School of Materials Science and Engineering
- Xi'an Jiaotong University
- Xi'an 710049, China
| | - L. Duan
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
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16
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He C, Liu G, Zhang WX, Shi ZQ, Zhou SL. Tuning the structures and electron transport properties of ultrathin Cu nanowires by size and bending stress using DFT and DFTB methods. RSC Adv 2015. [DOI: 10.1039/c4ra15051a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Electron transport properties of ultrathin Cu nanowires with diameters of 0.2–1.0 nm under different bending stresses are reported, using density functional theory and density-functional-based tight-binding approaches, for application in flexible displays and solar cells.
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Affiliation(s)
- C. He
- State Key Laboratory for Mechanical Behavior of Materials
- School of Materials Science and Engineering
- Xi’an Jiaotong University
- Xi’an 710049
| | - G. Liu
- State Key Laboratory for Mechanical Behavior of Materials
- School of Materials Science and Engineering
- Xi’an Jiaotong University
- Xi’an 710049
| | - W. X. Zhang
- School of Materials Science and Engineering
- Chang’an University
- Xi’an 710064
- China
| | - Z. Q. Shi
- State Key Laboratory for Mechanical Behavior of Materials
- School of Materials Science and Engineering
- Xi’an Jiaotong University
- Xi’an 710049
| | - S. L. Zhou
- State Key Laboratory for Mechanical Behavior of Materials
- School of Materials Science and Engineering
- Xi’an Jiaotong University
- Xi’an 710049
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17
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Xiao M, Yao T, Ao Z, Wei P, Wang D, Song H. Tuning electronic and magnetic properties of GaN nanosheets by surface modifications and nanosheet thickness. Phys Chem Chem Phys 2015; 17:8692-8. [DOI: 10.1039/c4cp05788k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(a and b) Atomic and band structures of 2-F-GaN NS, and (c) electronic and magnetic properties of different GaN NSs.
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Affiliation(s)
- Meixia Xiao
- School of Materials Science and Engineering
- Xi’an Shiyou University
- Xi’an 710065
- People's Republic of China
| | - Tingzhen Yao
- School of Materials Science and Engineering
- Xi’an Shiyou University
- Xi’an 710065
- People's Republic of China
| | - Zhimin Ao
- Centre for Clean Energy Technology
- School of Chemistry and Forensic Science
- University of Technology Sydney
- Sydney
- Australia
| | - Peng Wei
- School of Materials Science and Engineering
- Xi’an Shiyou University
- Xi’an 710065
- People's Republic of China
| | - Danghui Wang
- School of Materials Science and Engineering
- Xi’an Shiyou University
- Xi’an 710065
- People's Republic of China
| | - Haiyang Song
- School of Materials Science and Engineering
- Xi’an Shiyou University
- Xi’an 710065
- People's Republic of China
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18
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He C, Zhang WX, Li T, Zhao L, Wang XG. Tunable electronic and magnetic properties of monolayer MoS2 on decorated AlN nanosheets: a van der Waals density functional study. Phys Chem Chem Phys 2015; 17:23207-13. [DOI: 10.1039/c5cp02855h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structural, electronic, and magnetic properties of monolayer MoS2 on decorated AlN nanosheets have been systematically investigated using density functional theory with van der Waals corrections.
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Affiliation(s)
- C. He
- State Key Laboratory for Mechanical Behavior of Materials
- School of Materials Science and Engineering
- Xi'an Jiaotong University
- Xi'an 710049, China
| | - W. X. Zhang
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
| | - T. Li
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
| | - L. Zhao
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
| | - X. G. Wang
- School of Materials Science and Engineering
- Chang'an University
- Xi'an 710064, China
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19
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Reversible hydrophobic to hydrophilic transition in graphene via water splitting induced by UV irradiation. Sci Rep 2014; 4:6450. [PMID: 25245110 PMCID: PMC4171696 DOI: 10.1038/srep06450] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 09/01/2014] [Indexed: 01/26/2023] Open
Abstract
Although the reversible wettability transition between hydrophobic and hydrophilic graphene under ultraviolet (UV) irradiation has been observed, the mechanism for this phenomenon remains unclear. In this work, experimental and theoretical investigations demonstrate that the H2O molecules are split into hydrogen and hydroxyl radicals, which are then captured by the graphene surface through chemical binding in an ambient environment under UV irradiation. The dissociative adsorption of H2O molecules induces the wettability transition in graphene from hydrophobic to hydrophilic. Our discovery may hold promise for the potential application of graphene in water splitting.
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20
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Song EH, Ali G, Yoo SH, Jiang Q, Cho SO. Tuning electronic and magnetic properties of partially hydrogenated graphene by biaxial tensile strain: a computational study. NANOSCALE RESEARCH LETTERS 2014; 9:491. [PMID: 25258610 PMCID: PMC4167252 DOI: 10.1186/1556-276x-9-491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 09/05/2014] [Indexed: 06/03/2023]
Abstract
Using density functional theory calculations, we have investigated the effects of biaxial tensile strain on the electronic and magnetic properties of partially hydrogenated graphene (PHG) structures. Our study demonstrates that PHG configuration with hexagon vacancies is more energetically favorable than several other types of PHG configurations. In addition, an appropriate biaxial tensile strain can effectively tune the band gap and magnetism of the hydrogenated graphene. The band gap and magnetism of such configurations can be continuously increased when the magnitude of the biaxial tensile strain is increased. This fact that both the band gap and magnetism of partially hydrogenated graphene can be tuned by applying biaxial tensile strain provides a new pathway for the applications of graphene to electronics and photonics.
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Affiliation(s)
- Er Hong Song
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | - Ghafar Ali
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | - Sung Ho Yoo
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | - Qing Jiang
- Department of Materials Science and Engineering, Jilin University, Changchun 130022, China
| | - Sung Oh Cho
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
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21
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He Y, Chen WF, Yu WB, Ouyang G, Yang GW. Anomalous interface adhesion of graphene membranes. Sci Rep 2014; 3:2660. [PMID: 24036502 PMCID: PMC3773622 DOI: 10.1038/srep02660] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 08/21/2013] [Indexed: 11/17/2022] Open
Abstract
In order to understand the anomalous interface adhesion properties between graphene membranes and their substrates, we have developed a theoretical method to calibrate the interface adhesion energy of monolayer and multilayer graphene on substrates based on the bond relaxation consideration. Four kinds of interfaces, including graphene/SiO2, graphene/Cu, graphene/Cu/Ni and Cu/graphene/Ni, were taken into account. It was found that the membrane thickness and the interface confinement condition determine the adhesion energy. The relationship between the critical interface separation and the graphene thickness showed that the interface separation in the self-equilibrium state drops with decreasing membrane thickness. The size-dependent Young's modulus of graphene membrane and the interfacial condition were responsible for the novel interface adhesion energy. The proposed theory was expected to be applied to the design of graphene-based devices.
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Affiliation(s)
- Y He
- Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of Education, Department of Physics, Hunan Normal University, Changsha 410081, Hunan, China
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22
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Wen Z, Luo J, Zhu Y, Jiang Q. Cohesive-Energy-Resolved Bandgap of Nanoscale Graphene Derivatives. Chemphyschem 2014; 15:2563-8. [DOI: 10.1002/cphc.201402125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Indexed: 11/09/2022]
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23
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Zhu Y, Lian J, Jiang Q. Role of Edge Geometry and Magnetic Interaction in Opening Bandgap of Low-Dimensional Graphene. Chemphyschem 2014; 15:958-65. [DOI: 10.1002/cphc.201301127] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Indexed: 11/08/2022]
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24
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25
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Abstract
A sizable and tunable bandgap is realized in silicene–MoS2heterobilayers.
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Affiliation(s)
- N. Gao
- Key Laboratory of Automobile Materials (Jilin University)
- Ministry of Education
- and School of Materials Science and Engineering
- Jilin University
- Changchun, China
| | - J. C. Li
- Key Laboratory of Automobile Materials (Jilin University)
- Ministry of Education
- and School of Materials Science and Engineering
- Jilin University
- Changchun, China
| | - Q. Jiang
- Key Laboratory of Automobile Materials (Jilin University)
- Ministry of Education
- and School of Materials Science and Engineering
- Jilin University
- Changchun, China
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26
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He Y, Zhang P, Hou X, Xu J, Wang M, Wu Y, Qu J, Dong M. Adjusting the electronic properties of silicon carbide nanoribbons by introducing edge functionalization. RSC Adv 2014. [DOI: 10.1039/c4ra04351k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The electronic properties of silicon carbide nanoribbons can be adjusted by introducing edge functionalization.
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Affiliation(s)
- Yanqiong He
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
| | - Peng Zhang
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
- Key Laboratory of Automobile Materials
| | - Xiuli Hou
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
| | - Jiajia Xu
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
| | - Meiqi Wang
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
| | - Yansen Wu
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
| | - Jiacheng Qu
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013, China
| | - Mingdong Dong
- Center for DNA Nanotechnology (CDNA)
- interdisciplinary Nanoscience Center (iNANO)
- Aarhus University
- DK-8000 Aarhus, Denmark
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27
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Zhu YF, Dai QQ, Zheng WT, Jiang Q. Gap openings in graphene regarding interfacial interaction from substrates. Phys Chem Chem Phys 2014; 16:5600-4. [DOI: 10.1039/c3cp55222e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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