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Chen J, Dai F, Zhang L, Xu J, Liu W, Zeng S, Xu C, Chen L, Dai C. Molecular insights into the dispersion stability of graphene oxide in mixed solvents: Theoretical simulations and experimental verification. J Colloid Interface Sci 2020; 571:109-117. [PMID: 32192935 DOI: 10.1016/j.jcis.2020.03.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/09/2020] [Accepted: 03/09/2020] [Indexed: 01/21/2023]
Abstract
HYPOTHESIS Improving the dispersion stability of graphene oxide (GO) suspensions is of great importance in many potential applications of GO, such as GO-based laminated membranes used for separation, printable electronics, and aqueous liquid crystals. EXPERIMENTS Molecular dynamics (MD) simulations and quantum chemistry (QC) calculations along with complementary experiments were performed to study the dispersion stability of GO in the mixtures of water and polar organic solvents (dimethyl sulfoxide (DMSO), ethanol, and acetone). FINDINGS GO exhibits better dispersion stability in a solvent mixture than in pure water. The MD simulations uncover the underlying mechanism that mixed solvent layers are formed steadily on the surface of GO sheets and screen the interactions between them. QC calculations reveal that both DMSO and water form hydrogen bonds with the oxidized regions of GO. X-ray diffraction experiments confirm that the GO sheets are intercalated by DMSO and water molecules. Furthermore, the optimal ratio of the organic solvent to water is determined to achieve the best dispersion stability of GO through MD simulations. And such ratio is also verified by ultraviolet absorption spectral experiments. Thus, our findings provide a facile method to prepare GO suspensions with high dispersion stability.
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Affiliation(s)
- Junlang Chen
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
| | - Fangfang Dai
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
| | - Lingling Zhang
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
| | - Jing Xu
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
| | - Wei Liu
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
| | - Songwei Zeng
- School of Information and Industry, Zhejiang A&F University, Lin'an 311300, China.
| | - Can Xu
- Key Lab for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou 730000, China.
| | - Liang Chen
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
| | - Chaoqing Dai
- Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, China.
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52
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Nguyen GD, Oyedele AD, Haglund A, Ko W, Liang L, Puretzky AA, Mandrus D, Xiao K, Li AP. Atomically Precise PdSe 2 Pentagonal Nanoribbons. ACS NANO 2020; 14:1951-1957. [PMID: 32023412 DOI: 10.1021/acsnano.9b08390] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We report atomically precise pentagonal PdSe2 nanoribbons (PNRs) fabricated on a pristine PdSe2 substrate with a hybrid method of top-down and bottom-up processes. The PNRs form a uniform array of dimer structure with a width of 2.4 nm and length of more than 200 nm. In situ four-probe scanning tunneling microscopy (STM) reveals metallic behavior of PNRs with ballistic transport for at least 20 nm in length. Density functional theory calculations produce a semiconducting density of states of isolated PNRs and find that the band gap narrows and disappears quickly once considering coupling between PNR stacking layers or interaction with the PdSe2 substrate. The coupling of PNRs is further corroborated by Raman spectroscopy and field-effect transistor measurements. The facile method of fabricating atomically precise PNRs offers an air-stable functional material for dimensional control.
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Affiliation(s)
- Giang D Nguyen
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
- Stewart Blusson Quantum Matter Institute , University of British Columbia , Vancouver , British Columbia V6T 1Z4 , Canada
| | - Akinola D Oyedele
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
- Bredesen Center for Interdisciplinary Research and Graduate Education , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Amanda Haglund
- Bredesen Center for Interdisciplinary Research and Graduate Education , University of Tennessee , Knoxville , Tennessee 37996 , United States
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - Wonhee Ko
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Liangbo Liang
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Alexander A Puretzky
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - David Mandrus
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Kai Xiao
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
- Bredesen Center for Interdisciplinary Research and Graduate Education , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - An-Ping Li
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
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53
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Yano Y, Wang F, Mitoma N, Miyauchi Y, Ito H, Itami K. Step-Growth Annulative π-Extension Polymerization for Synthesis of Cove-Type Graphene Nanoribbons. J Am Chem Soc 2020; 142:1686-1691. [DOI: 10.1021/jacs.9b11328] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yuuta Yano
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Feijiu Wang
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Nobuhiko Mitoma
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Yuhei Miyauchi
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Hideto Ito
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Kenichiro Itami
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- JST-ERATO, Itami Molecular Nanocarbon Project, Nagoya University, Chikusa, Nagoya 464-8602, Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Chikusa, Nagoya 464-8602, Japan
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54
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Jolly A, Miao D, Daigle M, Morin J. Emerging Bottom‐Up Strategies for the Synthesis of Graphene Nanoribbons and Related Structures. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906379] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Anthony Jolly
- Department of Chemistry and Centre de Recherche sur les Matériaux AvancésUniversité Laval 1045 Ave de la Médecine Quebec QC G1V 0A6 Canada
| | - Dandan Miao
- Department of Chemistry and Centre de Recherche sur les Matériaux AvancésUniversité Laval 1045 Ave de la Médecine Quebec QC G1V 0A6 Canada
| | - Maxime Daigle
- Department of Chemistry and Centre de Recherche sur les Matériaux AvancésUniversité Laval 1045 Ave de la Médecine Quebec QC G1V 0A6 Canada
| | - Jean‐François Morin
- Department of Chemistry and Centre de Recherche sur les Matériaux AvancésUniversité Laval 1045 Ave de la Médecine Quebec QC G1V 0A6 Canada
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55
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Jolly A, Miao D, Daigle M, Morin JF. Emerging Bottom-Up Strategies for the Synthesis of Graphene Nanoribbons and Related Structures. Angew Chem Int Ed Engl 2019; 59:4624-4633. [PMID: 31265750 DOI: 10.1002/anie.201906379] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Indexed: 11/09/2022]
Abstract
The solution-phase synthesis is one of the most promising strategies for the preparation of well-defined graphene nanoribbons (GNRs) in large scale. To prepare high quality, defect-free GNRs, cycloaromatization reactions need to be very efficient, proceed without side reaction and mild enough to accommodate the presence of various functional groups. In this Minireview, we present the latest synthetic approaches for the synthesis of GNRs and related structures, including alkyne benzannulation, photochemical cyclodehydrohalogenation, Mallory and Pd- and Ni-catalyzed reactions.
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Affiliation(s)
- Anthony Jolly
- Department of Chemistry and Centre de Recherche sur les Matériaux Avancés, Université Laval, 1045 Ave de la Médecine, Quebec, QC, G1V 0A6, Canada
| | - Dandan Miao
- Department of Chemistry and Centre de Recherche sur les Matériaux Avancés, Université Laval, 1045 Ave de la Médecine, Quebec, QC, G1V 0A6, Canada
| | - Maxime Daigle
- Department of Chemistry and Centre de Recherche sur les Matériaux Avancés, Université Laval, 1045 Ave de la Médecine, Quebec, QC, G1V 0A6, Canada
| | - Jean-François Morin
- Department of Chemistry and Centre de Recherche sur les Matériaux Avancés, Université Laval, 1045 Ave de la Médecine, Quebec, QC, G1V 0A6, Canada
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56
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Sánchez-Ochoa F, Zhang J, Du Y, Huang Z, Canto G, Springborg M, Cocoletzi GH. Ultranarrow heterojunctions of armchair-graphene nanoribbons as resonant-tunnelling devices. Phys Chem Chem Phys 2019; 21:24867-24875. [PMID: 31517350 DOI: 10.1039/c9cp04368c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A systematic investigation is performed on the electronic transport properties of armchair-graphene nanoribbon (AGNR) heterojunctions using spin-polarized density functional theory calculations in combination with the non-equilibrium Green's function formalism. 9-AGNR and 5-AGNR structures are used to form a single-well configuration by sandwiching a 5-AGNR between two 9-AGNRs. At the same time, these 9-AGNRs are matched at the left and right to electrodes, 9 and 5 being the number of carbon dimers as width. This heterojunction mimics an electronic device with two potential barriers (9-AGNR) and one quantum well (5-AGNR) where quasi-bound states are confined. First, we study the ground state properties, and then we calculate the electron transport properties of this device as a function of the well width. We show the presence of electronic tunnelling resonances between the barriers by delocalized electron density inside the well's structure. This is corroborated by transmission curves, localized densities of states (LDOS), current-vs.-bias voltage results, and the trend of the resonances as a function of the well width. This work shows that carbon AGNRs may be used as resonant-tunnelling devices for applications in nanoelectronics.
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Affiliation(s)
- F Sánchez-Ochoa
- Universidad Nacional Autónoma de México, Instituto de Física, Apartado Postal 20-364, Cd. de México 01000, Mexico.
| | - Jie Zhang
- Department of Environmental Science & Engineering, Huaqiao University, Xiamen 361021, People's Republic of China
| | - Yueyao Du
- Department of Environmental Science & Engineering, Huaqiao University, Xiamen 361021, People's Republic of China
| | - Zhiwei Huang
- Department of Environmental Science & Engineering, Huaqiao University, Xiamen 361021, People's Republic of China
| | - G Canto
- Centro de Investigación en Corrosión, Universidad Autónoma de Campeche, Av. Héroe de Nacozari 480, 24079 Campeche, Campeche, Mexico
| | - Michael Springborg
- Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken, Germany
| | - Gregorio H Cocoletzi
- Benemérita Universidad Autónoma de Puebla, Instituto de Física, Apartado Postal J-48, Puebla 72570, Mexico
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57
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Rojas WY, Villegas CEP, Rocha AR. Ab initio modelling of spin relaxation lengths in disordered graphene nanoribbons. Phys Chem Chem Phys 2019; 21:26027-26032. [PMID: 31701103 DOI: 10.1039/c9cp04054d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The spin-dependent transport properties of armchair graphene nanoribbons in the presence of extrinsic spin-orbit coupling induced by a random distribution of nickel adatoms is studied. By combining a recursive Green's function formalism with density functional theory, we explore the influence of ribbon length and metal adatom concentration on the conductance. At a given length, we observed a significant enhancement of the spin-flip channel around resonances and at energies right above the Fermi level. We also estimate the spin-relaxation length, finding values on the order of tens of micrometers at low Ni adatom concentrations. This study is conducted at singular ribbon lengths entirely from fully ab initio methods, providing indirectly evidence that the Dyakonov-Perel spin relaxation mechanism might be the dominant at low concentrations as well as the observation of oscillations in the spin-polarization.
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Affiliation(s)
- Wudmir Y Rojas
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, Brazil
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58
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Yu Y, Jiang X, Fang Y, Chen J, Kang J, Cao Y, Xiang M. Investigation on the Effect of Hyperbranched Polyester Grafted Graphene Oxide on the Crystallization Behaviors of β-Nucleated Isotactic Polypropylene. Polymers (Basel) 2019; 11:E1988. [PMID: 31810249 PMCID: PMC6960721 DOI: 10.3390/polym11121988] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 11/25/2019] [Accepted: 11/27/2019] [Indexed: 11/16/2022] Open
Abstract
In this article, hyperbranched polyester grafted graphene oxide (GO) was successfully prepared. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and transmission electron microscopy (TEM) were performed for its characterizations. On the other hand, differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) were also performed to study its influences on non-isothermal crystallization behaviors of β-nucleated isotactic polypropylene (β-iPP). The grafting ratios of hyperbranched polyester with different supermolecular structures were calculated to be 19.8-24.0 wt %, which increase with the degree of branching. The results showed that the grafting of hyperbranched polyester was advantageous in increasing the crystallization peak temperature Tp and decreasing the crystallization activation energy ΔE of β-iPP/GO composites, which contributed to the iPP's crystallization process. Moreover, under all cooling rates (2, 5, 10, 20, 40 °C/min), crystallinities of β-iPP/GO were greatly improved after being grafted with hyperbranched polyester, because of the increase of the relative contents of α-phase αc and the average α-crystal sizes.
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Affiliation(s)
| | | | | | | | - Jian Kang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China; (Y.Y.); (X.J.); (Y.F.); (J.C.); (Y.C.); (M.X.)
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59
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Đurđić S, Vukojević V, Vlahović F, Ognjanović M, Švorc Ľ, Kalcher K, Mutić J, Stanković DM. Application of bismuth (III) oxide decorated graphene nanoribbons for enzymatic glucose biosensing. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113400] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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60
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Vasudevan A, Shvalya V, Zidanšek A, Cvelbar U. Tailoring electrical conductivity of two dimensional nanomaterials using plasma for edge electronics: A mini review. Front Chem Sci Eng 2019. [DOI: 10.1007/s11705-019-1805-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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61
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Yano Y, Mitoma N, Matsushima K, Wang F, Matsui K, Takakura A, Miyauchi Y, Ito H, Itami K. RETRACTED ARTICLE: Living annulative π-extension polymerization for graphene nanoribbon synthesis. Nature 2019; 571:387-392. [DOI: 10.1038/s41586-019-1331-z] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 05/01/2019] [Indexed: 11/09/2022]
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62
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Yu Y, Xu R, Chen J, Kang J, Xiang M, Li Y, Li L, Sheng X. Ordered structure effects on β-nucleated isotactic polypropylene/graphene oxide composites with different thermal histories. RSC Adv 2019; 9:19630-19640. [PMID: 35519359 PMCID: PMC9065320 DOI: 10.1039/c9ra03416a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 06/18/2019] [Indexed: 11/21/2022] Open
Abstract
In this paper, the influence of ordered structure effects (OSE) on crystallization behaviors of β-nucleated isotactic polypropylene/graphene oxide (β-iPP/GO) composites with different thermal histories, which crystallized at a slow cooling rate (called SLOW), fast cooling rate (called FAST) and medium cooling rate (called MED), respectively, was studied by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD). The ordered structure status of three samples before crystallization measurement was controlled by tuning the fusion temperature Tf and melting time tm. The results showed that for all samples, OSE would occur in an appropriate Tf region (Region II). The OSE efficiency of MED was the highest, while that of SLOW were the lowest. It was also found that the crystallinity and crystalline perfection of SLOW were the highest, while those of FAST were the lowest. The effects of the melting time tm on the OSE were also investigated. At Tf = 172 °C, the OSE efficiency of FAST reached the maximum at tm = 5 min, while that of SLOW reached the maximum at tm = 20 min. It was indicated that the OSE efficiency was affected by thermal history, and it could be improved by selecting the appropriate tm. Related mechanisms concerning the roles of thermal history on the OSE behavior were proposed based on the results of DSC and in situ SAXS. In this paper, the influence of ordered structure effects on crystallization behaviors of β-nucleated isotactic polypropylene/graphene oxide composites with different thermal histories was studied.![]()
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Affiliation(s)
- Yansong Yu
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University Chengdu 610065 China
| | - Ruizhang Xu
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University Chengdu 610065 China
| | - Jinyao Chen
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University Chengdu 610065 China
| | - Jian Kang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University Chengdu 610065 China
| | - Ming Xiang
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University Chengdu 610065 China
| | - Yuanjie Li
- Central Research Academy of Dongfang Electric Corporation Chengdu 611731 China
| | - Lu Li
- Chongqing Zhixiang Paving Technology Engineering Co., Ltd. Chongqing 401336 China
| | - Xingyue Sheng
- Chongqing Zhixiang Paving Technology Engineering Co., Ltd. Chongqing 401336 China
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63
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Gunnagol RM, Rabinal MHK. TiO
2
/rGO/CuS Nanocomposites for Efficient Photocatalytic Degradation of Rhodamine‐B Dye. ChemistrySelect 2019. [DOI: 10.1002/slct.201901041] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Raghu M. Gunnagol
- Department of PhysicsKarnatak University Dharwad- 580003 Karnataka India
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64
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Dabsamut K, T-Thienprasert J, Jungthawan S, Boonchun A. Stacking stability of C 2N bilayer nanosheet. Sci Rep 2019; 9:6861. [PMID: 31048761 PMCID: PMC6497902 DOI: 10.1038/s41598-019-43363-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 04/23/2019] [Indexed: 11/09/2022] Open
Abstract
In recent years, a 2D graphene-like sheet: monolayer C2N was synthesized via a simple wet-chemical reaction. Here, we studied the stability and electronic properties of bilayer C2N. According to a previous study, a bilayer may exist in one of three highly symmetric stacking configurations, namely as AA, AB and AB′-stacking. For the AA-stacking, the top layer is directly stacked on the bottom layer. Furthermore, AB- and AB′-stacking can be obtained by shifting the top layer of AA-stacking by a/3-b/3 along zigzag direction and by a/2 along armchair direction, respectively, where a and b are translation vectors of the unit cell. By using first-principles calculations, we calculated the stability of AA, AB and AB′-stacking C2N and their electronic band structure. We found that the AB-stacking is the most favorable structure and has the highest band gap, which appeared to agree with previous study. Nevertheless, we furthermore examine the energy landscape and translation sliding barriers between stacking layers. From energy profiles, we interestingly found that the most stable positions are shifted from the high symmetry AB-stacking. In electronic band structure details, band characteristic can be modified according to the shift. The interlayer shear mode close to local minimum point was determined to be roughly 2.02 × 1012 rad/s.
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Affiliation(s)
- Klichchupong Dabsamut
- Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.,Thailand Center of Excellence in Physics, Commission on the Higher Education, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand
| | - Jiraroj T-Thienprasert
- Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.,Thailand Center of Excellence in Physics, Commission on the Higher Education, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand
| | - Sirichok Jungthawan
- Thailand Center of Excellence in Physics, Commission on the Higher Education, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand.,School of Physics, Institute of Science, and Center of Excellence in Advanced Functional Materials, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
| | - Adisak Boonchun
- Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand. .,Thailand Center of Excellence in Physics, Commission on the Higher Education, 328 Si Ayutthaya Road, Bangkok, 10400, Thailand.
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65
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Sung H, Sharma M, Jang J, Lee SY, Choi MG, Lee K, Jung N. Boosting the oxygen reduction activity of a nano-graphene catalyst by charge redistribution at the graphene-metal interface. NANOSCALE 2019; 11:5038-5047. [PMID: 30839982 DOI: 10.1039/c8nr10327e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
N-Doped carbon materials have been intensively studied to replace Pt catalysts for the oxygen reduction reaction (ORR) in anion exchange membrane fuel cells (AEMFCs). However, the low doping level in these catalysts results in a limited number of ORR active sites, so high catalyst loading is still required. Hence, the electrode thickness becomes extra thick, causing large mass transfer resistance in AEMFCs. In this study, we propose a unique hybrid catalyst concept utilizing charge redistribution at the graphene-transition metal interface to modify the electronic structure of graphene and simultaneously create multiple carbon active sites. The hybrid catalyst consists of n-type nano-graphene shells (NGS) three-dimensionally coated on the surface of transition metal nanoparticles highly dispersed on carbon supports. The n-type NGS catalysts efficiently facilitate oxygen adsorption owing to facile charge transfer from the metal nanoparticles underneath and provide abundant active carbon sites owing to their structural benefits. As a result, despite the same catalyst loading, the NGS catalyst shows high ORR activity and greater durability than a carbon-supported Pt (Pt/C) catalyst.
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Affiliation(s)
- Hukwang Sung
- Graduate School of Energy Science and Technology (GEST), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea.
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66
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Hirai M, Tanaka N, Sakai M, Yamaguchi S. Structurally Constrained Boron-, Nitrogen-, Silicon-, and Phosphorus-Centered Polycyclic π-Conjugated Systems. Chem Rev 2019; 119:8291-8331. [DOI: 10.1021/acs.chemrev.8b00637] [Citation(s) in RCA: 286] [Impact Index Per Article: 57.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Masato Hirai
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan
| | - Naoki Tanaka
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan
| | - Mika Sakai
- Department of Chemistry, Graduate School of Science and Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo, Chikusa, Nagoya 464-8602, Japan
| | - Shigehiro Yamaguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya 464-8601, Japan
- Department of Chemistry, Graduate School of Science and Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo, Chikusa, Nagoya 464-8602, Japan
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67
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Applications of three-dimensional graphenes for preconcentration, extraction, and sorption of chemical species: a review. Mikrochim Acta 2019; 186:232. [PMID: 30852695 DOI: 10.1007/s00604-019-3324-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 02/14/2019] [Indexed: 12/23/2022]
Abstract
This review (with 115 refs) summarizes applications of 3-dimensional graphene (3DGs) and its derivatives in the fields of preconcentration, extraction, and sorption. Following an introduction into the field (including a definition of the materials treated here), the properties and synthetic strategies for 3DGs are described. The next section covers applications of 3DG-based adsorbents in solid phase extraction of organic species including drugs, phthalate esters, chlorophenols, aflatoxins, insecticides, and pesticides. Another section treats applications of 3DGs in solid phase microextraction of species such as polycyclic aromatic hydrocarbons, alcohols, and pesticides. We also describe how the efficiency of assays may be improved by using these materials as a sorbent. A final section covers conclusions and perspectives. Graphical abstract Graphical abstract contains poor quality and small text inside the artwork. Please do not re-use the file that we have rejected or attempt to increase its resolution and re-save. It is originally poor, therefore, increasing the resolution will not solve the quality problem. We suggest that you provide us the original format. We prefer replacement figures containing vector/editable objects rather than embedded images. Preferred file formats are eps, ai, tiff and pdf.Tiff file of graphical abstract was attached. Schematic presentation of synthesis of three-dimensional graphene (3DG) from two-dimensional graphene (2DG) with self-assembly, template-assisted and direct deposition methods. Application of 3DG-based nanoadsorbents in direct immersion-solid phase microextraction (DI-SPME), headspace-SPME (HS-SPME), magnetic-solid phase extraction (Magnetic-SPE), dispersive-SPE, and magnetic sheet-SPE.
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68
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Kasun ZA, Sato H, Nie J, Mori Y, Bender JA, Roberts ST, Krische MJ. Alternating oligo( o, p-phenylenes) via ruthenium catalyzed diol-diene benzannulation: orthogonality to cross-coupling enables de novo nanographene and PAH construction. Chem Sci 2018; 9:7866-7873. [PMID: 30429996 PMCID: PMC6194800 DOI: 10.1039/c8sc03236j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Accepted: 08/17/2018] [Indexed: 01/05/2023] Open
Abstract
Ruthenium(0) catalyzed diol-diene benzannulation is applied to the conversion of oligo(p-phenylene vinylenes) 2a-c, 5 and 6 to alternating oligo(o,p-phenylenes) 10a-c, 11-13. Orthogonality with respect to conventional palladium catalyzed biaryl cross-coupling permits construction of p-bromo-terminated alternating oligo(o,p-phenylenes) 10b, 11-13, which can be engaged in Suzuki cross-coupling and Scholl oxidation. In this way, structurally homogeneous nanographenes 16a-f are prepared. Nanographene 16a, which incorporates 14 fused benzene rings, was characterized by single crystal X-ray diffraction. In a similar fashion, p-bromo-terminated oligo(p-phenylene ethane diol) 9, which contains a 1,3,5-trisubstituted benzene core, is converted to the soluble, structurally homogeneous hexa-peri-hexabenzocoronene 18. A benzothiophene-terminated pentamer 10c was prepared and subjected to Scholl oxidation to furnish the helical bis(benzothiophene)-fused picene derivative 14. The steady-state absorption and emission properties of nanographenes 14, 16a,b,d,e,h and 18 were characterized. These studies illustrate how orthogonality of ruthenium(0) catalyzed diol-diene benzannulation with respect to classical biaryl cross-coupling streamlines oligophenylene and nanographene construction.
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Affiliation(s)
- Zachary A Kasun
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
| | - Hiroki Sato
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
| | - Jing Nie
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
| | - Yasuyuki Mori
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
| | - Jon A Bender
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
| | - Sean T Roberts
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
| | - Michael J Krische
- University of Texas at Austin , Department of Chemistry , Austin , TX 78712 , USA . ;
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69
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Ding Y, Wang Y. Stable H-Terminated Edges, Variable Semiconducting Properties, and Solar Cell Applications of C 3N Nanoribbons: A First-Principles Study. ACS OMEGA 2018; 3:8777-8786. [PMID: 31459010 PMCID: PMC6645292 DOI: 10.1021/acsomega.8b01391] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 07/26/2018] [Indexed: 06/09/2023]
Abstract
Motivated by the recent synthesis of the graphene-like C3N nanosheet, the geometrical structures and electronic properties of its ribbon form, that is, C3N nanoribbons (C3NNRs), are investigated by first-principles calculations. It is found that there are five types of energetically favorable H-terminated edges in the C3NNRs. Different from graphene nanoribbons, the corresponding stable C3NNRs are all nonmagnetic semiconductors regardless of the edge shape and termination. However, their band feature and gap size can be modulated by the ribbon width and edge termination, which brings direct-, quasi-direct-, and indirect-band-gap semiconducting behaviors in the nanoribbons. Comparing to the C3N nanosheet, the work function is reduced in the C3NNRs with fully di- and monohydrogenated edges, which results in a type-II band alignment with SiC and silicane nanosheets. More interestingly, the combined hetero-nanostructures will be promising excitonic solar cell materials with high power conversion efficiencies up to 17-21%. Our study demonstrates that the C3NNRs have distinct edge stabilities and variable semiconducting behaviors, which endow fascinating potential applications in the fields of solar energy and nanodevices.
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Affiliation(s)
- Yi Ding
- Department
of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 310036, People’s Republic
of China
| | - Yanli Wang
- Department
of Physics, Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Xiasha College Park, Hangzhou, Zhejiang 310018, People’s Republic of China
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70
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Yang G, Li L, Lee WB, Ng MC. Structure of graphene and its disorders: a review. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2018; 19:613-648. [PMID: 30181789 PMCID: PMC6116708 DOI: 10.1080/14686996.2018.1494493] [Citation(s) in RCA: 146] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 06/25/2018] [Accepted: 06/26/2018] [Indexed: 05/23/2023]
Abstract
Monolayer graphene exhibits extraordinary properties owing to the unique, regular arrangement of atoms in it. However, graphene is usually modified for specific applications, which introduces disorder. This article presents details of graphene structure, including sp2 hybridization, critical parameters of the unit cell, formation of σ and π bonds, electronic band structure, edge orientations, and the number and stacking order of graphene layers. We also discuss topics related to the creation and configuration of disorders in graphene, such as corrugations, topological defects, vacancies, adatoms and sp3-defects. The effects of these disorders on the electrical, thermal, chemical and mechanical properties of graphene are analyzed subsequently. Finally, we review previous work on the modulation of structural defects in graphene for specific applications.
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Affiliation(s)
- Gao Yang
- The State Key Laboratory of Ultraprecision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Lihua Li
- The State Key Laboratory of Ultraprecision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Wing Bun Lee
- The State Key Laboratory of Ultraprecision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Man Cheung Ng
- The State Key Laboratory of Ultraprecision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
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71
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Clancy AJ, Bayazit MK, Hodge SA, Skipper NT, Howard CA, Shaffer MSP. Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes. Chem Rev 2018; 118:7363-7408. [DOI: 10.1021/acs.chemrev.8b00128] [Citation(s) in RCA: 129] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adam J. Clancy
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
- Institute for Materials Discovery, University College London, London WC1E 7JE, U.K
| | - Mustafa K. Bayazit
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
| | - Stephen A. Hodge
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
- Cambridge Graphene Centre, Engineering Department, University of Cambridge, Cambridge CB3 0FA, U.K
| | - Neal T. Skipper
- Department of Physics & Astronomy, University College London, London WC1E 6BT, U.K
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Koch M, Li Z, Nacci C, Kumagai T, Franco I, Grill L. How Structural Defects Affect the Mechanical and Electrical Properties of Single Molecular Wires. PHYSICAL REVIEW LETTERS 2018; 121:047701. [PMID: 30095964 DOI: 10.1103/physrevlett.121.047701] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 04/25/2018] [Indexed: 06/08/2023]
Abstract
We report how individual defects affect single graphene nanoribbons by scanning tunneling and atomic force microscopy pulling experiments simultaneously accessing their electrical and mechanical properties. The on-surface polymerization of the graphene nanoribbons is controlled by cooperative effects as theoretically suggested. Further, we find, with the help of atomistic simulations, that defects substantially vary the molecule-substrate coupling and drastically increase the flexibility of the graphene nanoribbons while keeping their desirable electronic properties intact.
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Affiliation(s)
- Matthias Koch
- Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Zhi Li
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
| | - Christophe Nacci
- Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
- Department of Physical Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
| | - Takashi Kumagai
- Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Ignacio Franco
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
| | - Leonhard Grill
- Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
- Department of Physical Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
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73
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Ye L, Chen X, Cai G, Zhu J, Liu N, Liu QH. Electrically Tunable Broadband Terahertz Absorption with Hybrid-Patterned Graphene Metasurfaces. NANOMATERIALS 2018; 8:nano8080562. [PMID: 30042289 PMCID: PMC6116223 DOI: 10.3390/nano8080562] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 07/17/2018] [Accepted: 07/19/2018] [Indexed: 11/21/2022]
Abstract
We numerically demonstrate a broadband terahertz (THz) absorber that is based on a hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design is made up of a single-layer graphene with periodically arranged hybrid square/disk/loop patterns on a multilayer structure. We find that broadband absorption with 90% terahertz absorbance and the fractional bandwidth of 84.5% from 1.38 THz to 3.4 THz can be achieved. Because of the axisymmetric configuration, the absorber demonstrates absolute polarization independence for both transverse electric (TE) and transverse magnetic (TM) polarized terahertz waves under normal incidence. We also show that a bandwidth of 60% absorbance still remains 2.7 THz, ranging from 1.3 THz to 4 THz, for a wide incident angle ranging from 0° to 60°. Finally, we find that by changing the graphene Fermi energy from 0.7 eV to 0 eV, the absorbance of the absorbers can be easily tuned from more than 90% to lower than 20%. The proposed absorber may have promising applications in terahertz sensing, detecting, imaging, and cloaking.
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Affiliation(s)
- Longfang Ye
- Institute of Electromagnetics and Acoustics, and Department of Electronic Science, Xiamen University, Xiamen 361005, China.
- Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China.
| | - Xin Chen
- Institute of Electromagnetics and Acoustics, and Department of Electronic Science, Xiamen University, Xiamen 361005, China.
| | - Guoxiong Cai
- Institute of Electromagnetics and Acoustics, and Department of Electronic Science, Xiamen University, Xiamen 361005, China.
| | - Jinfeng Zhu
- Institute of Electromagnetics and Acoustics, and Department of Electronic Science, Xiamen University, Xiamen 361005, China.
- Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China.
| | - Na Liu
- Institute of Electromagnetics and Acoustics, and Department of Electronic Science, Xiamen University, Xiamen 361005, China.
- Shenzhen Research Institute of Xiamen University, Shenzhen 518057, China.
| | - Qing Huo Liu
- Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA.
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74
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Xing S, Liu B, Wang W, Guo J, Wang W. On-Surface Synthesis of Graphene Nanoribbons Catalyzed by Ni Atoms. Chem Asian J 2018; 13:2023-2026. [PMID: 29905404 DOI: 10.1002/asia.201800610] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/01/2018] [Indexed: 11/12/2022]
Abstract
Nanometer-wide graphene nanoribbons can be synthesized from halogen aromatics through multistep on-surface reactions, but the catalytic role of extrinsic transition-metal atoms in these reactions are still to be explored. Here by low-temperature scanning tunneling microscopy, we investigated the on-surface synthesis of graphene nanoribbons from 10,10'-dibromo-9,9'-bianthryl precursors in the presence of Ni atoms. Ni atoms not only act as catalysts in debromination and lead to the formation of an organometallic intermediate at 300 K, but also prompt the fusion reaction between graphene nanoribbons at 673 K. Our work demonstrates a more efficient way to fabricate fused graphene nanoribbons.
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Affiliation(s)
- Shuya Xing
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- College of Physics, Jilin University, Changchun, 130012, China
| | - Bing Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Wenquan Wang
- College of Physics, Jilin University, Changchun, 130012, China
| | - Jiandong Guo
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
| | - Weihua Wang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
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75
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Haghighian N, Convertino D, Miseikis V, Bisio F, Morgante A, Coletti C, Canepa M, Cavalleri O. Rippling of graphitic surfaces: a comparison between few-layer graphene and HOPG. Phys Chem Chem Phys 2018; 20:13322-13330. [PMID: 29717315 DOI: 10.1039/c8cp01039k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The surface structure of Few-Layer Graphene (FLG) epitaxially grown on the C-face of SiC has been investigated by TM-AFM in ambient air and upon interaction with dilute aqueous solutions of bio-organic molecules (l-methionine and dimethyl sulfoxide, DMSO). Before interaction with molecular solutions, we observe nicely ordered, three-fold oriented rippled domains, with a 4.7 ± 0.2 nm periodicity (small periodicity, SP) and a peak-to-valley distance in the range 0.1-0.2 nm. Upon mild interaction with the molecular solution, the ripple periodicity "relaxes" to 6.2 ± 0.2 nm (large periodicity, LP), while the peak-to-valley height increases to 0.2-0.3 nm. When additional energy is transferred to the system through sonication in solution, graphene planes are peeled off, as shown by quantitative analysis of Raman spectroscopy and X-ray photoelectron spectroscopy which indicate a neat reduction of thickness. Upon exfoliation rippled domains are no longer observed. In comparative experiments on cleaved HOPG, we could not observe ripples on pristine samples in ambient air, while LP ripples develop upon interaction with the molecular solutions. Recent literature on similar systems is not univocal regarding the interpretation of rippling. The ensemble of our comparative observations on FLG and HOPG can be hardly rationalized solely on the basis of the surface assembly of molecules, either organic molecules coming from the solution or adventitious species. We propose to consider rippling as the manifestation of the free-energy minimization of quasi-2D layers, eventually affected by factors such as interplanar stacking, and interactions with molecules and/or with the AFM tip.
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Affiliation(s)
- N Haghighian
- OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - D Convertino
- CNI@NEST, Istituto Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy
| | - V Miseikis
- CNI@NEST, Istituto Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy
| | - F Bisio
- CNR-SPIN, C.so Perrone 24, 16152 Genova, Italy
| | - A Morgante
- CNR-IOM, Strada Statale 14 - km 163.5, 34149 Trieste, Italy and Dipartimento di Fisica, Università di Trieste, Via Valerio 2, 34127 Trieste, Italy
| | - C Coletti
- CNI@NEST, Istituto Italiano di Tecnologia, Piazza S. Silvestro 12, 56127 Pisa, Italy and Graphene Labs, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
| | - M Canepa
- OptMatLab, Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy
| | - O Cavalleri
- Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, 16146 Genova, Italy.
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76
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Xu X, Liu C, Sun Z, Cao T, Zhang Z, Wang E, Liu Z, Liu K. Interfacial engineering in graphene bandgap. Chem Soc Rev 2018. [PMID: 29513306 DOI: 10.1039/c7cs00836h] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Graphene exhibits superior mechanical strength, high thermal conductivity, strong light-matter interactions, and, in particular, exceptional electronic properties. These merits make graphene an outstanding material for numerous potential applications. However, a graphene-based high-performance transistor, which is the most appealing application, has not yet been produced, which is mainly due to the absence of an intrinsic electronic bandgap in this material. Therefore, bandgap opening in graphene is urgently needed, and great efforts have been made regarding this topic over the past decade. In this review article, we summarise recent theoretical and experimental advances in interfacial engineering to achieve bandgap opening. These developments are divided into two categories: chemical engineering and physical engineering. Chemical engineering is usually destructive to the pristine graphene lattice via chemical functionalization, the introduction of defects, doping, chemical bonds with substrates, and quantum confinement; the latter largely maintains the atomic structure of graphene intact and includes the application of an external field, interactions with substrates, physical adsorption, strain, electron many-body effects and spin-orbit coupling. Although these pioneering works have not met all the requirements for electronic applications of graphene at once, they hold great promise in this direction and may eventually lead to future applications of graphene in semiconductor electronics and beyond.
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Affiliation(s)
- Xiaozhi Xu
- State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
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77
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Kim CH. Nanostructured Graphene: An Active Component in Optoelectronic Devices. NANOMATERIALS 2018; 8:nano8050328. [PMID: 29757992 PMCID: PMC5977342 DOI: 10.3390/nano8050328] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/11/2018] [Accepted: 05/12/2018] [Indexed: 01/09/2023]
Abstract
Nanostructured and chemically modified graphene-based nanomaterials possess intriguing properties for their incorporation as an active component in a wide spectrum of optoelectronic architectures. From a technological point of view, this aspect brings many new opportunities to the now well-known atomically thin carbon sheet, multiplying its application areas beyond transparent electrodes. This article gives an overview of fundamental concepts, theoretical backgrounds, design principles, technological implications, and recent advances in semiconductor devices that integrate nanostructured graphene materials into their active region. Starting from the unique electronic nature of graphene, a physical understanding of finite-size effects, non-idealities, and functionalizing mechanisms is established. This is followed by the conceptualization of hybridized films, addressing how the insertion of graphene can modulate or improve material properties. Importantly, it provides general guidelines for designing new materials and devices with specific characteristics. Next, a number of notable devices found in the literature are highlighted. It provides practical information on material preparation, device fabrication, and optimization for high-performance optoelectronics with a graphene hybrid channel. Finally, concluding remarks are made with the summary of the current status, scientific issues, and meaningful approaches to realizing next-generation technologies.
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Affiliation(s)
- Chang-Hyun Kim
- Department of Electronic Engineering, Gachon University, Seongnam 13120, Korea.
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78
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Klappenberger F, Hellwig R, Du P, Paintner T, Uphoff M, Zhang L, Lin T, Moghanaki BA, Paszkiewicz M, Vobornik I, Fujii J, Fuhr O, Zhang YQ, Allegretti F, Ruben M, Barth JV. Functionalized Graphdiyne Nanowires: On-Surface Synthesis and Assessment of Band Structure, Flexibility, and Information Storage Potential. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1704321. [PMID: 29405570 DOI: 10.1002/smll.201704321] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Indexed: 05/24/2023]
Abstract
Carbon nanomaterials exhibit extraordinary mechanical and electronic properties desirable for future technologies. Beyond the popular sp2 -scaffolds, there is growing interest in their graphdiyne-related counterparts incorporating both sp2 and sp bonding in a regular scheme. Herein, we introduce carbonitrile-functionalized graphdiyne nanowires, as a novel conjugated, one-dimensional (1D) carbon nanomaterial systematically combining the virtues of covalent coupling and supramolecular concepts that are fabricated by on-surface synthesis. Specifically, a terphenylene backbone is extended with reactive terminal alkyne and polar carbonitrile (CN) moieties providing the required functionalities. It is demonstrated that the CN functionalization enables highly selective alkyne homocoupling forming polymer strands and gives rise to mutual lateral attraction entailing room-temperature stable double-stranded assemblies. By exploiting the templating effect of the vicinal Ag(455) surface, 40 nm long semiconducting nanowires are obtained and the first experimental assessment of their electronic band structure is achieved by angle-resolved photoemission spectroscopy indicating an effective mass below 0.1m0 for the top of the highest occupied band. Via molecular manipulation it is showcased that the novel oligomer exhibits extreme mechanical flexibility and opens unexplored ways of information encoding in clearly distinguishable CN-phenyl trans-cis species. Thus, conformational data storage with density of 0.36 bit nm-2 and temperature stability beyond 150 K comes in reach.
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Affiliation(s)
| | - Raphael Hellwig
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | - Ping Du
- Institute für Nanotechnologie, Karlsruher Institut für Technologie (KIT), 76344, Eggenstein-Leopoldshafen, Germany
| | - Tobias Paintner
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | - Martin Uphoff
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | - Liding Zhang
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | - Tao Lin
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | | | - Mateusz Paszkiewicz
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | - Ivana Vobornik
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, I-34149, Trieste, Italy
| | - Jun Fujii
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, I-34149, Trieste, Italy
| | - Olaf Fuhr
- Institute für Nanotechnologie, Karlsruher Institut für Technologie (KIT), 76344, Eggenstein-Leopoldshafen, Germany
| | - Yi-Qi Zhang
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
| | | | - Mario Ruben
- Institute für Nanotechnologie, Karlsruher Institut für Technologie (KIT), 76344, Eggenstein-Leopoldshafen, Germany
- IPCMS-CNRS, Université de Strasbourg, F-67034, Strasbourg, France
| | - Johannes V Barth
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany
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79
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Cui X, Troadec C, Wee ATS, Huang YL. Surface Nanostructure Formation and Atomic-Scale Templates for Nanodevices. ACS OMEGA 2018; 3:3285-3293. [PMID: 31458585 PMCID: PMC6641249 DOI: 10.1021/acsomega.8b00014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 02/09/2018] [Indexed: 05/20/2023]
Abstract
The holy grail in nanoelectronics is the construction of nanodevices with high density, low cost, and high performance per device and per integrated circuit. One approach is the fabrication of surface nanostructures and atomic-scale templates via the autonomous assembly of atoms and/or molecules on well-defined surfaces. To steer the atomic or molecular growth processes and create a wide range of surface nanostructures with desired properties, a comprehensive understanding of the mechanisms that control the surface self-assembly processes is required. The capability to manipulate the nanodevices at the submolecular level with good controllability is also of paramount importance. This review highlights some key recent developments in the fabrication of low-dimensional nanostructures based on supramolecular self-assembly on predefined surfaces, with particular emphasis on the rapidly expanding field of two-dimensional materials. Special attention is also given to the latest progress in single-molecule manipulation for future device applications.
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Affiliation(s)
- Xiaoyang Cui
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
- Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | - Cedric Troadec
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
| | - Andrew T. S. Wee
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
- Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- E-mail: (A.T.S.W.)
| | - Yu Li Huang
- Institute
of Materials Research & Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore
- Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
- E-mail: (Y.L.H.)
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80
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Panahi SFKS, Namiranian A, Soleimani M, Jamaati M. Electron transport in polycyclic aromatic hydrocarbons/boron nitride hybrid structures: density functional theory combined with the nonequilibrium Green's function. Phys Chem Chem Phys 2018; 20:4160-4166. [PMID: 29359215 DOI: 10.1039/c7cp07260k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We investigate the electronic transport properties of two types of junction based on single polyaromatic hydrocarbons (PAHs) and PAHs embedded in boron nitride (h-BN) nanoribbons, using nonequilibrium Green's functions (NEGF) and density functional theory (DFT). In the PAH junctions, a Fano resonance line shape at the Fermi energy in the transport feature can be clearly seen. In hybrid junctions, structural asymmetries enable interactions between the electronic states, leading to observation of interface-based transport. Our findings reveal that the interface of PAH/h-BN strongly affects the transport properties of the structures.
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Affiliation(s)
- S F K S Panahi
- Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran.
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81
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Maschio L, Lorenz M, Pullini D, Sgroi M, Civalleri B. The unique Raman fingerprint of boron nitride substitution patterns in graphene. Phys Chem Chem Phys 2018; 18:20270-5. [PMID: 27406407 DOI: 10.1039/c6cp02101h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Boron nitride-substituted graphene (BNsG) two-dimensional structures are new materials of wide technological interest due to the rich variety of electronic structures and properties they can exploit. The ability to accurately characterize them is key to their future success. Here we show, by means of ab initio simulations, that the vibrational Raman spectra of such compounds are extremely sensitive to substitution motifs and concentration, and that each structure has unique and distinct features. This result can be useful as a guide for the optimization of production processes.
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Affiliation(s)
- Lorenzo Maschio
- Dipartimento di Chimica, Università di Torino, via Giuria 5, I-10125 Torino, Italy. and NIS (Nanostructured Interfaces and Surfaces) Centre, Università di Torino, via Giuria 5, I-10125 Torino, Italy
| | - Marco Lorenz
- Dipartimento di Chimica, Università di Torino, via Giuria 5, I-10125 Torino, Italy.
| | - Daniele Pullini
- Centro Ricerche FIAT, Strada Torino 50, 10043 Orbassano, Torino, Italy
| | - Mauro Sgroi
- Centro Ricerche FIAT, Strada Torino 50, 10043 Orbassano, Torino, Italy
| | - Bartolomeo Civalleri
- Dipartimento di Chimica, Università di Torino, via Giuria 5, I-10125 Torino, Italy. and NIS (Nanostructured Interfaces and Surfaces) Centre, Università di Torino, via Giuria 5, I-10125 Torino, Italy
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82
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Yeh CN, Wu C, Su H, Chai JD. Electronic properties of the coronene series from thermally-assisted-occupation density functional theory. RSC Adv 2018; 8:34350-34358. [PMID: 35548596 PMCID: PMC9087050 DOI: 10.1039/c8ra01336e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 09/28/2018] [Indexed: 11/21/2022] Open
Abstract
To fully utilize the great potential of graphene in electronics, a comprehensive understanding of the electronic properties of finite-size graphene flakes is essential.
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Affiliation(s)
- Chia-Nan Yeh
- Department of Physics
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Can Wu
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Republic of Singapore
| | - Haibin Su
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore 639798
- Republic of Singapore
- Department of Chemistry
| | - Jeng-Da Chai
- Department of Physics
- National Taiwan University
- Taipei 10617
- Taiwan
- Center for Theoretical Physics
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83
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Jordan RS, Li YL, Lin CW, McCurdy RD, Lin JB, Brosmer JL, Marsh KL, Khan SI, Houk KN, Kaner RB, Rubin Y. Synthesis of N = 8 Armchair Graphene Nanoribbons from Four Distinct Polydiacetylenes. J Am Chem Soc 2017; 139:15878-15890. [DOI: 10.1021/jacs.7b08800] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert S. Jordan
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Yolanda L. Li
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Cheng-Wei Lin
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Ryan D. McCurdy
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Janice B. Lin
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Jonathan L. Brosmer
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Kristofer L. Marsh
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Saeed I. Khan
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - K. N. Houk
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Richard B. Kaner
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
| | - Yves Rubin
- Department of Chemistry and
Biochemistry, University of California, Los Angeles, 607 Charles Young Dr. East, Los Angeles, California 90095-1567, United States
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84
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Yu H, Jiang X, Cai M, Feng J, Chen X, Yang X, Liu Y. Electronic and magnetic properties of zigzag C2N-h2D nanoribbons: Edge and width effects. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.07.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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85
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Hartmann RR, Portnoi ME. Two-dimensional Dirac particles in a Pöschl-Teller waveguide. Sci Rep 2017; 7:11599. [PMID: 28912569 PMCID: PMC5599532 DOI: 10.1038/s41598-017-11411-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 08/23/2017] [Indexed: 11/22/2022] Open
Abstract
We obtain exact solutions to the two-dimensional (2D) Dirac equation for the one-dimensional Pöschl-Teller potential which contains an asymmetry term. The eigenfunctions are expressed in terms of Heun confluent functions, while the eigenvalues are determined via the solutions of a simple transcendental equation. For the symmetric case, the eigenfunctions of the supercritical states are expressed as spheroidal wave functions, and approximate analytical expressions are obtained for the corresponding eigenvalues. A universal condition for any square integrable symmetric potential is obtained for the minimum strength of the potential required to hold a bound state of zero energy. Applications for smooth electron waveguides in 2D Dirac-Weyl systems are discussed.
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Affiliation(s)
- R R Hartmann
- Physics Department, De La Salle University, 2401 Taft Avenue, Manila, 0922, Philippines.
| | - M E Portnoi
- School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom.
- International Institute of Physics, Universidade Federal do Rio Grande do Norte, Natal - RN, Brazil.
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86
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Ye L, Chen Y, Cai G, Liu N, Zhu J, Song Z, Liu QH. Broadband absorber with periodically sinusoidally-patterned graphene layer in terahertz range. OPTICS EXPRESS 2017; 25:11223-11232. [PMID: 28788804 DOI: 10.1364/oe.25.011223] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We demonstrate that a broadband terahertz absorber with near-unity absorption can be realized using a net-shaped periodically sinusoidally-patterned graphene sheet, placed on a dielectric spacer supported on a metallic reflecting plate. Because of the gradient width modulation of the unit graphene sheet, continuous plasmon resonances can be excited, and therefore broadband terahertz absorption can be achieved. The results show that the absorber's normalized bandwidth of 90% terahertz absorbance is over 65% under normal incidence for both TE and TM polarizations when the graphene chemical potential is set as 0.7 eV. And the broadband absorption is insensitive to the incident angles and the polarizations. The peak absorbance remains more than 70% over a wide range of the incident angles up to 60° for both polarizations. Furthermore, this absorber also has the advantage of flexible tunability via electrostatic doping of graphene sheet, which peak absorbance can be continuously tuned from 14% to 100% by controlling the chemical potential from 0 eV to 0.8 eV. The design scheme is scalable to develop various graphene-based tunable broadband absorbers at other terahertz, infrared, and visible frequencies, which may have promising applications in sensing, detecting, and optoelectronic devices.
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87
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Tharmavaram M, Rawtani D, Pandey G. Fabrication routes for one-dimensional nanostructures via block copolymers. NANO CONVERGENCE 2017; 4:12. [PMID: 28546902 PMCID: PMC5423919 DOI: 10.1186/s40580-017-0106-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Accepted: 04/17/2017] [Indexed: 06/07/2023]
Abstract
Nanotechnology is the field which deals with fabrication of materials with dimensions in the nanometer range by manipulating atoms and molecules. Various synthesis routes exist for the one, two and three dimensional nanostructures. Recent advancements in nanotechnology have enabled the usage of block copolymers for the synthesis of such nanostructures. Block copolymers are versatile polymers with unique properties and come in many types and shapes. Their properties are highly dependent on the blocks of the copolymers, thus allowing easy tunability of its properties. This review briefly focusses on the use of block copolymers for synthesizing one-dimensional nanostructures especially nanowires, nanorods, nanoribbons and nanofibers. Template based, lithographic, and solution based approaches are common approaches in the synthesis of nanowires, nanorods, nanoribbons, and nanofibers. Synthesis of metal, metal oxides, metal oxalates, polymer, and graphene one dimensional nanostructures using block copolymers have been discussed as well.
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Affiliation(s)
- Maithri Tharmavaram
- Institute of Research & Development, Gujarat Forensic Sciences University, Sector 18-A, Near Police Bhavan, Gandhinagar, Gujarat 382007 India
| | - Deepak Rawtani
- Institute of Research & Development, Gujarat Forensic Sciences University, Sector 18-A, Near Police Bhavan, Gandhinagar, Gujarat 382007 India
| | - Gaurav Pandey
- Institute of Research & Development, Gujarat Forensic Sciences University, Sector 18-A, Near Police Bhavan, Gandhinagar, Gujarat 382007 India
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88
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Lin PC, Chen YR, Hsu KT, Lin TN, Tung KL, Shen JL, Liu WR. Nano-sized graphene flakes: insights from experimental synthesis and first principles calculations. Phys Chem Chem Phys 2017; 19:6338-6344. [PMID: 28059408 DOI: 10.1039/c6cp08354d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In this study, we proposed a cost-effective method for preparing graphene nano-flakes (GNFs) derived from carbon nanotubes (CNTs) via three steps (pressing, homogenization and sonication exfoliation processes). Scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), laser scattering, as well as ultraviolet-visible and photoluminescence (PL) measurements were carried out. The results indicated that the size of as-synthesized GNFs was approximately 40-50 nm. Furthermore, we also used first principles calculations to understand the transformation from CNTs to GNFs from the viewpoints of the edge formation energies of GNFs in different shapes and sizes. The corresponding photoluminescence measurements of GNFs were carried out in this work.
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Affiliation(s)
- Pin-Chun Lin
- Department of Chemical Engineering, Chung Yuan Christian University, Chungli, 32023, Taiwan, Republic of China.
| | - Yi-Rui Chen
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Kuei-Ting Hsu
- Department of Chemical Engineering, Army Academy, Chungli 32023, Taiwan, Republic of China
| | - Tzu-Neng Lin
- Department of Physics, Chung Yuan Christian University, Chungli, 32023, Taiwan, Republic of China
| | - Kuo-Lun Tung
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan, Republic of China.
| | - Ji-Lin Shen
- Department of Physics, Chung Yuan Christian University, Chungli, 32023, Taiwan, Republic of China
| | - Wei-Ren Liu
- Department of Chemical Engineering, Chung Yuan Christian University, Chungli, 32023, Taiwan, Republic of China.
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89
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Tandel RD, Naik RS, Seetharamappa J. Electrochemical Characteristics and Electrosensing of an Antiviral Drug, Entecavir via Synergic Effect of Graphene Oxide Nanoribbons and Ceria Nanorods. ELECTROANAL 2017. [DOI: 10.1002/elan.201600492] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Roopa S. Naik
- Department of Chemistry; Karnatak University; Dharwad 580 003 India
| | - J. Seetharamappa
- Department of Chemistry; Karnatak University; Dharwad 580 003 India
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90
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Edge-Functionalized Graphene Nanoribbon Frameworks for the Capture and Separation of Greenhouse Gases. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02483] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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91
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Sarmah A, Hobza P. Understanding the spin-dependent electronic properties of symmetrically far-edge doped zigzag graphene nanoribbon from a first principles study. RSC Adv 2017. [DOI: 10.1039/c7ra09889h] [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
DFT simulations envision that far-edge doping also induced some tunable spin-dependent properties in the zigzag graphene nanoribbons.
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Affiliation(s)
- Amrit Sarmah
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences
- CZ-16610 Prague 6
- Czech Republic
| | - Pavel Hobza
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences
- CZ-16610 Prague 6
- Czech Republic
- Department of Physical Chemistry
- Palacký University
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92
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Augustine S, Singh J, Srivastava M, Sharma M, Das A, Malhotra BD. Recent advances in carbon based nanosystems for cancer theranostics. Biomater Sci 2017; 5:901-952. [DOI: 10.1039/c7bm00008a] [Citation(s) in RCA: 143] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This review deals with four different types of carbon allotrope based nanosystems and summarizes the results of recent studies that are likely to have applications in cancer theranostics. We discuss the applications of these nanosystems for cancer imaging, drug delivery, hyperthermia, and PDT/TA/PA.
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Affiliation(s)
- Shine Augustine
- NanoBioelectronics Laboratory
- Department of Biotechnology
- Delhi Technological University
- Delhi 110042
- India
| | - Jay Singh
- Department of Applied Chemistry & Polymer Technology
- Delhi Technological University
- Delhi 110042
- India
| | - Manish Srivastava
- Department of Physics & Astrophysics
- University of Delhi
- Delhi 110007
- India
| | - Monica Sharma
- NanoBioelectronics Laboratory
- Department of Biotechnology
- Delhi Technological University
- Delhi 110042
- India
| | - Asmita Das
- NanoBioelectronics Laboratory
- Department of Biotechnology
- Delhi Technological University
- Delhi 110042
- India
| | - Bansi D. Malhotra
- NanoBioelectronics Laboratory
- Department of Biotechnology
- Delhi Technological University
- Delhi 110042
- India
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93
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Thomas R, Hembram KPSS, Kumar BM, Rao GM. High density oxidative plasma unzipping of multiwall carbon nanotubes. RSC Adv 2017. [DOI: 10.1039/c7ra04318j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Oxidative plasma-assisted unzipping of multiwall carbon nanotubes (MWCNTs) to transform them into petal like nano ribbons, releasing excessive strain with various plasma exposure times.
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Affiliation(s)
- Rajesh Thomas
- Department of Instrumentation and Applied Physics
- Indian Institute of Science
- Bangalore 560012
- India
| | - K. P. S. S. Hembram
- Center for Opto-Electronic Materials and Devices
- Korea Institute of Science and Technology
- Seoul 02792
- Republic of Korea
| | - B. V. Mohan Kumar
- Department of Nano Science & Technology
- Bharathiar University
- Coimbatore
- India
- Department of Physics
| | - G. Mohan Rao
- Department of Instrumentation and Applied Physics
- Indian Institute of Science
- Bangalore 560012
- India
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94
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Singh S, De Sarkar A, Singh B, Kaur I. Electronic and transport behavior of doped armchair silicene nanoribbons exhibiting negative differential resistance and its FET performance. RSC Adv 2017. [DOI: 10.1039/c6ra27101d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The electronic and transport properties of armchair silicene nanoribbons (ASiNRs) doped with various elements are investigated.
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Affiliation(s)
- Sukhbir Singh
- Biomolecular Electronics and Nanotechnology Division
- Central Scientific Instruments Organisation
- Chandigarh 160030
- India
- Academy of Scientific and Innovative Research
| | | | - Bijender Singh
- Kurukshetra University
- Department of Electronic Science
- Kurukshetra
- India
| | - Inderpreet Kaur
- Biomolecular Electronics and Nanotechnology Division
- Central Scientific Instruments Organisation
- Chandigarh 160030
- India
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95
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Quantum chemical prediction of vibrational spectra of large molecular systems with radical or metallic electronic structure. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2016.11.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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96
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Yang Y, Mosquera MA, Skinner K, Becerra AE, Shamamian V, Schatz GC, Ratner MA, Marks TJ. Electronic Structure and Potential Reactivity of Silaaromatic Molecules. J Phys Chem A 2016; 120:9476-9488. [DOI: 10.1021/acs.jpca.6b09526] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yang Yang
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Martín A. Mosquera
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Kwan Skinner
- Dow Corning Corporation, Midland, Michigan 48686, United States
| | | | | | - George C. Schatz
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Mark A. Ratner
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Tobin J. Marks
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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97
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Le NB, Woods LM. Graphene nanoribbons anchored to SiC substrates. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:364001. [PMID: 27392014 DOI: 10.1088/0953-8984/28/36/364001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Graphene nanoribbons are quasi-one-dimensional planar graphene allotropes with diverse properties dependent on their width and types of edges. Graphene nanoribbons anchored to substrates is a hybrid system, which offers novel opportunities for property modifications as well as experimental control. Here we present electronic structure calculations of zigzag graphene nanoribbons chemically attached via the edges to the Si or C terminated surfaces of a SiC substrate. The results show that the edge characteristics are rather robust and the properties are essentially determined by the individual nanoribbon. While the localized spin polarization of the graphene nanoribbon edge atoms is not significantly affected by the substrate, secondary energy gaps in the highest conduction and lowest valence region may emerge in the anchored structures. The van der Waals interaction together with the electrostatic interactions due to the polarity of the surface bonds are found to be important for the structure parameters and energy stability.
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Affiliation(s)
- Nam B Le
- Department of Physics, University of South Florida, 4202 E Fowler Ave., Tampa, FL 33620, USA. Institute of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi 100000, Vietnam
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98
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Liu J, Xu Y, Cai H, Zuo C, Huang Z, Lin L, Guo X, Chen Z, Lai F. Double hexagonal graphene ring synthesized using a growth-etching method. NANOSCALE 2016; 8:14178-14183. [PMID: 27387556 DOI: 10.1039/c6nr02515c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Precisely controlling the layer number, stacking order, edge configuration, shape and structure of graphene is extremely challenging but highly desirable in scientific research. In this report, a new concept named the growth-etching method has been explored to synthesize a graphene ring using the chemical vapor deposition process. The graphene ring is a hexagonal structure, which contains a hexagonal exterior edge and a hexagonal hole in the centre region. The most important concept introduced here is that the oxide nanoparticle derived from annealing is found to play a dual role. Firstly, it acts as a nucleation site to grow the hexagonal graphene domain and then it works as a defect for etching to form a hole. The evolution process of the graphene ring with the etching time was carefully studied. In addition, a double hexagonal graphene ring was successfully synthesized for the first time by repeating the growth-etching process, which not only confirms the validity and repeatability of the method developed here but may also be further extended to grow unique graphene nanostructures with three, four, or even tens of graphene rings. Finally, a schematic model was drawn to illustrate how the double hexagonal graphene ring is generated and propagated. The results shown here may provide valuable guidance for the design and growth of unique nanostructures of graphene and other two-dimensional materials.
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Affiliation(s)
- Jinyang Liu
- College of Physics and Energy, Fujian Normal University, Fuzhou, 350117, P. R. China.
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99
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Lehnherr D, Chen C, Pedramrazi Z, DeBlase CR, Alzola JM, Keresztes I, Lobkovsky EB, Crommie MF, Dichtel WR. Sequence-defined oligo( ortho-arylene) foldamers derived from the benzannulation of ortho(arylene ethynylene)s. Chem Sci 2016; 7:6357-6364. [PMID: 28567248 PMCID: PMC5450445 DOI: 10.1039/c6sc02520j] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/06/2016] [Indexed: 01/10/2023] Open
Abstract
A Cu-catalyzed benzannulation reaction transforms ortho(arylene ethynylene) oligomers into ortho-arylenes.
A Cu-catalyzed benzannulation reaction transforms ortho(arylene ethynylene) oligomers into ortho-arylenes. This approach circumvents iterative Suzuki cross-coupling reactions previously used to assemble hindered ortho-arylene backbones. These derivatives form helical folded structures in the solid-state and in solution, as demonstrated by X-ray crystallography and solution-state NMR analysis. DFT calculations of misfolded conformations are correlated with variable-temperature 1H and EXSY NMR to reveal that folding is cooperative and more favorable in halide-substituted naphthalenes. Helical ortho-arylene foldamers with specific aromatic sequences organize functional π-electron systems into arrangements ideal for ambipolar charge transport and show preliminary promise for the surface-mediated synthesis of structurally defined graphene nanoribbons.
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Affiliation(s)
- Dan Lehnherr
- Department of Chemistry and Chemical Biology , Baker Laboratory , Cornell University , Ithaca , New York 14853-1301 , USA .
| | - Chen Chen
- Department of Physics , University of California at Berkeley , Berkeley , California 94720 , USA .
| | - Zahra Pedramrazi
- Department of Physics , University of California at Berkeley , Berkeley , California 94720 , USA .
| | - Catherine R DeBlase
- Department of Chemistry and Chemical Biology , Baker Laboratory , Cornell University , Ithaca , New York 14853-1301 , USA .
| | - Joaquin M Alzola
- Department of Chemistry and Chemical Biology , Baker Laboratory , Cornell University , Ithaca , New York 14853-1301 , USA .
| | - Ivan Keresztes
- Nuclear Magnetic Resonance Laboratory , Cornell University , Ithaca , New York 14853-1301 , USA
| | - Emil B Lobkovsky
- X-ray Crystallography Laboratory , Cornell University , Ithaca , New York 14853-1301 , USA
| | - Michael F Crommie
- Department of Physics , University of California at Berkeley , Berkeley , California 94720 , USA .
| | - William R Dichtel
- Department of Chemistry and Chemical Biology , Baker Laboratory , Cornell University , Ithaca , New York 14853-1301 , USA . .,Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , USA
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Hu YY, Li WQ, Yang L, Feng JK, Tian WQ. Electronic properties and nonlinear optical responses of boron/nitrogen-doped zigzag graphene nanoribbons. CAN J CHEM 2016. [DOI: 10.1139/cjc-2016-0037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The electronic properties and second-order nonlinear optical (NLO) responses of B/N-doped zigzag graphene nanoribbon (ZGNR) have been investigated using quantum chemistry methods. The electron-deficient B atoms prefer to form π-conjugation with the C atoms nearby along the B-doped zigzag edge. On the other hand, the electron-rich N atoms with radical characteristics weaken the conjugated bonding effects in the N-doped ZGNR. The NLO response of the ZGNR is enhanced by doping only one zigzag edge with B or N atoms. The conjugated B-doped zigzag edge takes the role of electron donor, while the N-doped zigzag edge serves as electron acceptor, giving rise to the discordant impact on the second-order NLO response of the BN-doped ZGNR.
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Affiliation(s)
- Yang-Yang Hu
- State Key Laboratory of Urban Water Resource and Environment, Institute of Theoretical and Simulational Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, P.R. China
| | - Wei-Qi Li
- Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang Province 150001, P.R. China
| | - Li Yang
- State Key Laboratory of Urban Water Resource and Environment, Institute of Theoretical and Simulational Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, P.R. China
| | - Ji-Kang Feng
- Institute of Theoretical Chemistry and College of Chemistry, Jilin University, 130023 Changchun, P.R. China
| | - Wei Quan Tian
- State Key Laboratory of Urban Water Resource and Environment, Institute of Theoretical and Simulational Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, P.R. China
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