51
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Vikramaditya T, Lin ST. Assessing the role of Hartree-Fock exchange, correlation energy and long range corrections in evaluating ionization potential, and electron affinity in density functional theory. J Comput Chem 2017; 38:1844-1852. [DOI: 10.1002/jcc.24828] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/07/2017] [Accepted: 04/10/2017] [Indexed: 01/31/2023]
Affiliation(s)
- Talapunur Vikramaditya
- Computational Molecular Engineering Laboratory, Department of Chemical Engineering; National Taiwan University; Taipei 10617 Taiwan
| | - Shiang-Tai Lin
- Computational Molecular Engineering Laboratory, Department of Chemical Engineering; National Taiwan University; Taipei 10617 Taiwan
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52
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Jones L, Lin L. An In Silico Study on the Isomers of Pentacene: The Case for Air-Stable and Alternative C 22H 14 Acenes for Organic Electronics. J Phys Chem A 2017; 121:2804-2813. [PMID: 28338331 DOI: 10.1021/acs.jpca.6b11770] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pentacene is one of the most investigated candidates for organic thin film transistor (OTFT) applications over the last few decades even though it unstable in air (Eg = 1.80 eV), owing in part to its planar nature and high charge-transfer mobilities as both a single crystal (35 cm2 V-1 s-1) and as a thin-film (3.0 cm2 V-1 s-1). Until now, picene is the only isomer of pentacene to be investigated for organic electronic applications, due to its greater stability (Eg = 4.21 eV) and high-charge transfer mobility (3.0 cm2 V-1 s-1); even benefiting from oxygen doping. In the present study, a total of 12 fused-ring isomers (including pentacene, picene and ten other structures) of the formula C22H14 were analyzed and investigated for their electronic and optical properties for worth in OTFT applications. We screened several pure and hybrid DFT functionals against the experimental frontier molecular orbitals (FMOs) of pentacene, then deployed Marcus Theory, Koopmans' Theorem and Green's function with the P3 electron propagator variant, for the internal hole reorganization energy, the hole transfer integral (via the "splitting-in-dimer method" at d = 3.0, 3.5, and 4.0 Å), the charge transfer rate constant, and vertical ionization energies. Using these as a basis, we studied pentacene's isomers and found that the four nonplanar structures, namely, benzo[g]chrysene (3), naphtho[c]phenanthrene (7), benzo[c]chrysene (11) and dibenzo[c,c']phenthrene (12), are (I) more stable than pentacene, by up to 2 eV, and (II) have relatively similar ionization energies (7.5-7.6 eV) to those of picene's experimental value (7.51 eV). The largest charge transfer rates at 3.5 Å dimer separations were given by the isomers benzo[b]chrysene 4, naphtha[c]phenanthrene 7, dibenzo[a,c]anthracene 8 and benzo[a]tetracene 10 and found to be 2.92, 1.72, 1.30, and 3.09 × 1014 s-1 respectively. In comparison to that of pentacene (KCT = 3.97 × 1014 s-1), these unusual isomers are thus promising air-stable and alternative candidates for organic electronic applications.
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Affiliation(s)
- Leighton Jones
- Centre for Industrial Collaboration, School of Chemistry, University of Leeds , Woodhouse Lane, Leeds, West Yorkshire, United Kingdom , LS2 9JT
| | - Long Lin
- Centre for Industrial Collaboration, School of Chemistry, University of Leeds , Woodhouse Lane, Leeds, West Yorkshire, United Kingdom , LS2 9JT
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53
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Stec GJ, Lauchner A, Cui Y, Nordlander P, Halas NJ. Multicolor Electrochromic Devices Based on Molecular Plasmonics. ACS NANO 2017; 11:3254-3261. [PMID: 28225586 DOI: 10.1021/acsnano.7b00364] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polycyclic aromatic hydrocarbon (PAH) molecules, the hydrogen-terminated, sub-nanometer-scale version of graphene, support plasmon resonances with the addition or removal of a single electron. Typically colorless when neutral, they are transformed into vivid optical absorbers in either their positively or negatively charged states. Here, we demonstrate a low-voltage, multistate electrochromic device based on PAH plasmon resonances that can be reversibly switched between nearly colorless (0 V), olive (+4 V), and royal blue (-3.5 V). The device exhibits highly efficient color change compared to electrochromic polymers and metal oxides, lower power consumption than liquid crystals, and is shown to reversibly switch for at least 100 cycles. We also demonstrate the additive property of molecular plasmon resonances in a single-layer device to display a reversible, transmissive-to-black device. This work illuminates the potential of PAH molecular plasmonics for the development of color displays and large-area color-changing applications due to their processability and ultralow power consumption.
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Affiliation(s)
- Grant J Stec
- Department of Chemistry, ‡Department of Electrical and Computer Engineering, §Department of Physics and Astronomy, and ∥Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Adam Lauchner
- Department of Chemistry, ‡Department of Electrical and Computer Engineering, §Department of Physics and Astronomy, and ∥Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Yao Cui
- Department of Chemistry, ‡Department of Electrical and Computer Engineering, §Department of Physics and Astronomy, and ∥Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Peter Nordlander
- Department of Chemistry, ‡Department of Electrical and Computer Engineering, §Department of Physics and Astronomy, and ∥Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Naomi J Halas
- Department of Chemistry, ‡Department of Electrical and Computer Engineering, §Department of Physics and Astronomy, and ∥Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
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54
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Adkins EM, Miller JH. Towards a taxonomy of topology for polynuclear aromatic hydrocarbons: linking electronic and molecular structure. Phys Chem Chem Phys 2017; 19:28458-28469. [DOI: 10.1039/c7cp06048c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Trends linking topology of PAH to their electronic properties are reported, evaluating how HOMO–LUMO gap depends on structure and size.
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Affiliation(s)
- Erin M. Adkins
- Department of Chemistry George Washington University 800 22nd St
- Washington
- USA
| | - J. Houston Miller
- Department of Chemistry George Washington University 800 22nd St
- Washington
- USA
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55
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Partes C, Yildirim C, Schuster S, Kind M, Bats JW, Zharnikov M, Terfort A. Self-Assembled Monolayers of Pseudo-C 2v-Symmetric, Low-Band-Gap Areneoxazolethiolates on Gold Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11474-11484. [PMID: 27728975 DOI: 10.1021/acs.langmuir.6b03055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A series of three homologous arene[2,3-d]-oxazole-2-thiols (benzoxazole-2-thiol (BOxSH), naphthaleneoxazole-2-thiol (NOxSH), and anthraceneoxazole-2-thiol (AOxSH)) were deposited onto Au(111) to obtain surfaces suitable as injection layers for organic electronics. The guiding idea was that the increasingly extended conjugated system would lower the band gap of the films while the introduction of the annulated heteroaromatic ring would provide the opportunity for pseudosymmetric attachment of the sulfur anchor, what should lower the conformational freedom of the system. In fact, the annulation of the oxazole ring lowers the optical band gaps of the parent compounds to 3.1-4.0 eV, depending on the number of benzene rings. To characterize the respective monolayers, a variety of spectroscopic techniques such as ellipsometry, infrared reflection-absorption spectroscopy, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure spectroscopy have been utilized. The monolayers of BOxS exhibit a lower film quality than those of NOxS and AOxS, with enhanced molecular density and more upright molecular orientation with increasing molecular length. Infrared spectroscopy suggests that the nitrogen atoms of the oxazole rings are located more closely to the Au(111) surface than the oxygen atoms, although no hints for an electronic interaction between the N atoms and the gold surface could be found. This preferred orientation could be tentatively traced to packing effects, solving a conundrum of the literature.
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Affiliation(s)
- Christoph Partes
- Institute of Inorganic and Analytical Chemistry, Frankfurt University , Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Can Yildirim
- Applied Physical Chemistry, Heidelberg University , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Swen Schuster
- Applied Physical Chemistry, Heidelberg University , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Martin Kind
- Institute of Inorganic and Analytical Chemistry, Frankfurt University , Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Jan W Bats
- Institute of Organic Chemistry and Chemical Biology, Frankfurt University , Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
| | - Michael Zharnikov
- Applied Physical Chemistry, Heidelberg University , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Andreas Terfort
- Institute of Inorganic and Analytical Chemistry, Frankfurt University , Max-von-Laue-Straße 7, 60438 Frankfurt, Germany
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56
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Agnihotri N. Computational modelling of panchromatic porphyrins with strong NIR absorptions for solar energy capture. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.10.050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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57
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Cui Y, Lauchner A, Manjavacas A, Garcı A de Abajo FJ, Halas NJ, Nordlander P. Molecular Plasmon-Phonon Coupling. NANO LETTERS 2016; 16:6390-6395. [PMID: 27668447 DOI: 10.1021/acs.nanolett.6b02800] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Charged polycyclic aromatic hydrocarbons (PAHs), ultrasmall analogs of hydrogen-terminated graphene consisting of only a few fused aromatic carbon rings, have been shown to possess molecular plasmon resonances in the visible region of the spectrum. Unlike larger nanostructures, the PAH absorption spectra reveal rich, highly structured spectral features due to the coupling of the molecular plasmons with the vibrations of the molecule. Here, we examine this molecular plasmon-phonon interaction using a quantum mechanical approach based on the Franck-Condon approximation. We show that an independent boson model can be used to describe the complex features of the PAH absorption spectra, yielding an analytical and semiquantitative description of their spectral features. This investigation provides an initial insight into the coupling of fundamental excitations-plasmons and phonons-in molecules.
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Affiliation(s)
- Yao Cui
- Department of Chemistry, Rice University , Houston, Texas 77005, United States
- Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Adam Lauchner
- Department of Electrical and Computer Engineering, Rice University , Houston, Texas 77005, United States
- Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Alejandro Manjavacas
- Department of Physics and Astronomy, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - F Javier Garcı A de Abajo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Castelldefels (Barcelona), Spain
- ICREA-Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys, 23, 08010 Barcelona, Spain
| | - Naomi J Halas
- Department of Chemistry, Rice University , Houston, Texas 77005, United States
- Department of Electrical and Computer Engineering, Rice University , Houston, Texas 77005, United States
- Department of Physics and Astronomy, Rice University , Houston, Texas 77005, United States
- Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
| | - Peter Nordlander
- Department of Electrical and Computer Engineering, Rice University , Houston, Texas 77005, United States
- Department of Physics and Astronomy, Rice University , Houston, Texas 77005, United States
- Laboratory for Nanophotonics, Rice University , Houston, Texas 77005, United States
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58
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Computational investigation of the effects of perfluorination on the charge-transport properties of polyaromatic hydrocarbons. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.06.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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59
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Zhao X, Xiong Y, Ma J, Yuan Z. Rylene and Rylene Diimides: Comparison of Theoretical and Experimental Results and Prediction for High-Rylene Derivatives. J Phys Chem A 2016; 120:7554-60. [DOI: 10.1021/acs.jpca.6b07552] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaohong Zhao
- College
of Chemistry, Nanchang University, Nanchang 330031, P. R. China
| | - Yushuai Xiong
- College
of Chemistry, Nanchang University, Nanchang 330031, P. R. China
| | - Jie Ma
- College
of Chemistry, Nanchang University, Nanchang 330031, P. R. China
| | - Zhongyi Yuan
- College
of Chemistry, Nanchang University, Nanchang 330031, P. R. China
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60
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Cochran RE, Kubátová A, Kozliak EI. An Approach to the Estimation of Adsorption Enthalpies of Polycyclic Aromatic Hydrocarbons on Particle Surfaces. J Phys Chem A 2016; 120:6029-38. [DOI: 10.1021/acs.jpca.6b03611] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Richard E. Cochran
- Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, United States
| | - Alena Kubátová
- Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, United States
| | - Evguenii I. Kozliak
- Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, United States
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61
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GW in the Gaussian and Plane Waves Scheme with Application to Linear Acenes. J Chem Theory Comput 2016; 12:3623-35. [DOI: 10.1021/acs.jctc.6b00380] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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62
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Extracting Conformational Ensembles of Small Molecules from Molecular Dynamics Simulations: Ampicillin as a Test Case. COMPUTATION 2016. [DOI: 10.3390/computation4010005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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63
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Markiewicz JT, Wudl F. Perylene, Oligorylenes, and Aza-Analogs. ACS APPLIED MATERIALS & INTERFACES 2015; 7:28063-85. [PMID: 26465638 DOI: 10.1021/acsami.5b02243] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An in-depth discussion of the properties of perylene is presented. Tuning the properties of perylene by introducing nitrogens is also explored. Finally, we do not discuss the synthesis and properties of oligorylenes functionalized with dicarboxyimide bonds.
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Affiliation(s)
- John T Markiewicz
- Materials Research Lab, California NanoSystems Institute, University of California at Santa Barbara , Santa Barbara, California 93106-9510, United States
| | - Fred Wudl
- Materials Research Lab, California NanoSystems Institute, University of California at Santa Barbara , Santa Barbara, California 93106-9510, United States
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64
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Rapacioli M, Simon A, Marshall CCM, Cuny J, Kokkin D, Spiegelman F, Joblin C. Cationic Methylene-Pyrene Isomers and Isomerization Pathways: Finite Temperature Theoretical Studies. J Phys Chem A 2015; 119:12845-54. [PMID: 26600076 DOI: 10.1021/acs.jpca.5b09494] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper provides spectral characterizations of the two isomers of the 1-methylenepyrene cation, namely, the 1-pyrenemethylium and a pyrene-like isomer owing a tropylium cycle. Both are possible photodissociation products of the 1-methylpyrene cation and were proposed as potential contributors to the diffuse interstellar bands. In that respect, vibrational and electronic spectra are computed for the optimized structures at the density functional theory (DFT) and time-dependent (TD-)DFT levels. Finite temperature effects on these spectra are estimated from molecular dynamics simulations within the density functional-based tight-binding (DFTB) and TD-DFTB frameworks, these methods being first benchmarked against DFT and TD-DFT calculations. The computed spectra allow discrimination of the two isomers. When the temperature increases, bands are observed to redshift and merge. The isomerization mechanism is investigated with the metadynamics technique, a biased dynamics scheme allowing to probe reaction mechanisms with high energy barriers by investigating the free energy surface at various temperatures. Four pathways with similar barrier heights (3.5-4 eV) are found, showing that the interconversion process would only occur in interstellar clouds under photoactivation. The present study opens the way to simulations on larger methyl- and methylenePAHs of astrophysical interest and their experimental investigation.
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Affiliation(s)
- Mathias Rapacioli
- Laboratoire de Chimie et Physique Quantiques LCPQ/IRSAMC, Université de Toulouse (UPS) and CNRS , 118 Route de Narbonne, F-31062 Toulouse, France
| | - Aude Simon
- Laboratoire de Chimie et Physique Quantiques LCPQ/IRSAMC, Université de Toulouse (UPS) and CNRS , 118 Route de Narbonne, F-31062 Toulouse, France
| | - Charlotte C M Marshall
- Université de Toulouse, UPS-OMP, IRAP , 31400 Toulouse, France.,CNRS, IRAP , 9 Avenue du Colonel Roche, BP 44346-31028 Toulouse Cedex 4, France
| | - Jérôme Cuny
- Laboratoire de Chimie et Physique Quantiques LCPQ/IRSAMC, Université de Toulouse (UPS) and CNRS , 118 Route de Narbonne, F-31062 Toulouse, France
| | - Damian Kokkin
- Université de Toulouse, UPS-OMP, IRAP , 31400 Toulouse, France.,CNRS, IRAP , 9 Avenue du Colonel Roche, BP 44346-31028 Toulouse Cedex 4, France
| | - Fernand Spiegelman
- Laboratoire de Chimie et Physique Quantiques LCPQ/IRSAMC, Université de Toulouse (UPS) and CNRS , 118 Route de Narbonne, F-31062 Toulouse, France
| | - Christine Joblin
- Université de Toulouse, UPS-OMP, IRAP , 31400 Toulouse, France.,CNRS, IRAP , 9 Avenue du Colonel Roche, BP 44346-31028 Toulouse Cedex 4, France
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65
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Lauchner A, Schlather AE, Manjavacas A, Cui Y, McClain MJ, Stec GJ, García de Abajo FJ, Nordlander P, Halas NJ. Molecular Plasmonics. NANO LETTERS 2015; 15:6208-14. [PMID: 26244925 DOI: 10.1021/acs.nanolett.5b02549] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Graphene supports surface plasmons that have been observed to be both electrically and geometrically tunable in the mid- to far-infrared spectral regions. In particular, it has been demonstrated that graphene plasmons can be tuned across a wide spectral range spanning from the mid-infrared to the terahertz. The identification of a general class of plasmonic excitations in systems containing only a few dozen atoms permits us to extend this versatility into the visible and ultraviolet. As appealing as this extension might be for active nanoscale manipulation of visible light, its realization constitutes a formidable technical challenge. We experimentally demonstrate the existence of molecular plasmon resonances in the visible for ionized polycyclic aromatic hydrocarbons (PAHs), which we reversibly switch by adding, then removing, a single electron from the molecule. The charged PAHs display intense absorption in the visible regime with electrical and geometrical tunability analogous to the plasmonic resonances of much larger nanographene systems. Finally, we also use the switchable molecular plasmon in anthracene to demonstrate a proof-of-concept low-voltage electrochromic device.
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Affiliation(s)
- Adam Lauchner
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - Andrea E Schlather
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - Alejandro Manjavacas
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - Yao Cui
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - Michael J McClain
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - Grant J Stec
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - F Javier García de Abajo
- ICFO-Institut de Ciencies Fotoniques , Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain
- ICREA-Institució Catalana de Recerca i Estudis Avancats, Passeig Lluís Companys , 23, 08010 Barcelona, Spain
| | - Peter Nordlander
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
| | - Naomi J Halas
- Laboratory for Nanophotonics, Smalley-Curl Institute, Rice University Houston, Texas 77005, United States
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66
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XUV excitation followed by ultrafast non-adiabatic relaxation in PAH molecules as a femto-astrochemistry experiment. Nat Commun 2015; 6:7909. [PMID: 26268456 PMCID: PMC4557118 DOI: 10.1038/ncomms8909] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 06/24/2015] [Indexed: 11/28/2022] Open
Abstract
Highly excited molecular species are at play in the chemistry of interstellar media and are involved in the creation of radiation damage in a biological tissue. Recently developed ultrashort extreme ultraviolet light sources offer the high excitation energies and ultrafast time-resolution required for probing the dynamics of highly excited molecular states on femtosecond (fs) (1 fs=10−15s) and even attosecond (as) (1 as=10−18 s) timescales. Here we show that polycyclic aromatic hydrocarbons (PAHs) undergo ultrafast relaxation on a few tens of femtoseconds timescales, involving an interplay between the electronic and vibrational degrees of freedom. Our work reveals a general property of excited radical PAHs that can help to elucidate the assignment of diffuse interstellar absorption bands in astrochemistry, and provides a benchmark for the manner in which coupled electronic and nuclear dynamics determines reaction pathways in large molecules following extreme ultraviolet excitation. Extreme UV light sources allow us to study the dynamics of excited molecular stets over remarkably short timeframes. Here, the authors probe polyaromatic hydrocarbons—large organic molecules—and show their electronic excitation and subsequent ultrafast relaxation.
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67
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Malloci G, Vargiu AV, Serra G, Bosin A, Ruggerone P, Ceccarelli M. A Database of Force-Field Parameters, Dynamics, and Properties of Antimicrobial Compounds. Molecules 2015; 20:13997-4021. [PMID: 26247924 PMCID: PMC6332394 DOI: 10.3390/molecules200813997] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 07/28/2015] [Indexed: 02/01/2023] Open
Abstract
We present an on-line database of all-atom force-field parameters and molecular properties of compounds with antimicrobial activity (mostly antibiotics and some beta-lactamase inhibitors). For each compound, we provide the General Amber Force Field parameters for the major species at physiological pH, together with an analysis of properties of interest as extracted from µs-long molecular dynamics simulations in explicit water solution. The properties include number and population of structural clusters, molecular flexibility, hydrophobic and hydrophilic molecular surfaces, the statistics of intraand inter-molecular H-bonds, as well as structural and dynamical properties of solvent molecules within first and second solvation shells. In addition, the database contains several key molecular parameters, such as energy of the frontier molecular orbitals, vibrational properties, rotational constants, atomic partial charges and electric dipole moment, computed by Density Functional Theory. The present database (to our knowledge the first extensive one including dynamical properties) is part of a wider project aiming to build-up a database containing structural, physico-chemical and dynamical properties of medicinal compounds using different force-field parameters with increasing level of complexity and reliability. The database is freely accessible at http://www.dsf.unica.it/translocation/db/.
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Affiliation(s)
- Giuliano Malloci
- Dipartimento di Fisica, Università degli studi di Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.
| | - Attilio Vittorio Vargiu
- Dipartimento di Fisica, Università degli studi di Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.
| | - Giovanni Serra
- Dipartimento di Fisica, Università degli studi di Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.
| | - Andrea Bosin
- Dipartimento di Fisica, Università degli studi di Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.
| | - Paolo Ruggerone
- Dipartimento di Fisica, Università degli studi di Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.
| | - Matteo Ceccarelli
- Dipartimento di Fisica, Università degli studi di Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.
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68
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Huang D, Byers CP, Wang LY, Hoggard A, Hoener B, Dominguez-Medina S, Chen S, Chang WS, Landes CF, Link S. Photoluminescence of a Plasmonic Molecule. ACS NANO 2015; 9:7072-9. [PMID: 26165983 DOI: 10.1021/acsnano.5b01634] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Photoluminescent Au nanoparticles are appealing for biosensing and bioimaging applications because of their non-photobleaching and non-photoblinking emission. The mechanism of one-photon photoluminescence from plasmonic nanostructures is still heavily debated though. Here, we report on the one-photon photoluminescence of strongly coupled 50 nm Au nanosphere dimers, the simplest plasmonic molecule. We observe emission from coupled plasmonic modes as revealed by single-particle photoluminescence spectra in comparison to correlated dark-field scattering spectroscopy. The photoluminescence quantum yield of the dimers is found to be surprisingly similar to the constituent monomers, suggesting that the increased local electric field of the dimer plays a minor role, in contradiction to several proposed mechanisms. Aided by electromagnetic simulations of scattering and absorption spectra, we conclude that our data are instead consistent with a multistep mechanism that involves the emission due to radiative decay of surface plasmons generated from excited electron-hole pairs following interband absorption.
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Affiliation(s)
- Da Huang
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Chad P Byers
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Lin-Yung Wang
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Anneli Hoggard
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Ben Hoener
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Sergio Dominguez-Medina
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Sishan Chen
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Wei-Shun Chang
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Christy F Landes
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
| | - Stephan Link
- †Department of Chemistry and ‡Department of Electrical and Computer Engineering Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States
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Margraf JT, Strauss V, Guldi DM, Clark T. The Electronic Structure of Amorphous Carbon Nanodots. J Phys Chem B 2015; 119:7258-65. [PMID: 25731776 DOI: 10.1021/jp510620j] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We have studied hydrogen-passivated amorphous carbon nanostructures with semiempirical molecular orbital theory in order to provide an understanding of the factors that affect their electronic properties. Amorphous structures were first constructed using periodic calculations in a melt/quench protocol. Pure periodic amorphous carbon structures and their counterparts doped with nitrogen and/or oxygen feature large electronic band gaps. Surprisingly, descriptors such as the elemental composition and the number of sp(3)-atoms only influence the electronic structure weakly. Instead, the exact topology of the sp(2)-network in terms of effective conjugation defines the band gap. Amorphous carbon nanodots of different structures and sizes were cut out of the periodic structures. Our calculations predict the occurrence of localized electronic surface states, which give rise to interesting effects such as amphoteric reactivity and predicted optical band gaps in the near-UV/visible range. Optical and electronic gaps display a dependence on particle size similar to that of inorganic colloidal quantum dots.
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Affiliation(s)
- Johannes T Margraf
- †Computer-Chemie-Centrum and Interdisciplinary Center for Molecular Materials, Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91052 Erlangen, Germany
| | - Volker Strauss
- ‡Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Dirk M Guldi
- ‡Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Timothy Clark
- †Computer-Chemie-Centrum and Interdisciplinary Center for Molecular Materials, Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91052 Erlangen, Germany.,§Centre for Molecular Design, University of Portsmouth, Portsmouth PO1 2DY, United Kingdom
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70
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Musa A, Saeed M, Shaari A, Sahnoun R, Lawal M. Effects of delocalised π-electrons around the linear acenes ring (n= 1 to 7): an electronic properties through DFT and quantum chemical descriptors. Mol Phys 2015. [DOI: 10.1080/00268976.2014.993734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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71
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Despoja V, Marušić L. Use of surface plasmons for manipulation of organic molecule quasiparticles and optical properties. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:485012. [PMID: 25387984 DOI: 10.1088/0953-8984/26/48/485012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Our recently proposed theoretical formulation based on Bethe–Salpeter G(0)W(0) methodology is applied here to explore the quasiparticle and optical spectra of anthracene (C(14)H10) placed close to a metallic surface. Special attention is paid to explore how the energy shift and decay width of the low-lying anthracene bright excitons p, α and β depend on the type of the adjacent surface (described by the Wigner Seits radius r(s)) and the separation from the surface. It is shown that p and α excitons weakly interact with surface excitations, but for r(s) ≈ 3 the intensive β exciton hybridizes with surface plasmon considerably, resulting in its splitting into two optically active modes. The β exciton decays extraordinarily fast (Γ ≈ 200 meV) to the electron-hole excitations in the metallic surface even for non-contact separations (z(0) ≈ 12 a.u.). For r(s) > 5 the β exciton becomes infinitely sharp (Γ ≈ 0) and no longer interacts with the surface plasmon. Moreover, it is shown that HOMO and LUMO states near a metallic surface behave as statically screened rigid orbitals, with the result that the simple image theory arguments are sufficient to explain the HOMO–LUMO gap shift. Finally, it is demonstrated that the HOMO–LUMO gap shift dominantly depends on the position of the effective image plane z(im) of the adjacent surface.
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72
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Gloriozov IP, Marchal R, Saillard J, Oprunenko YF. Chromium Tricarbonyl and Chromium Benzene Complexes of Graphene, Their Properties, Stabilities, and Inter‐Ring Haptotropic Rearrangements – A DFT Investigation. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402879] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Igor P. Gloriozov
- Department of Chemistry, M.V. Lomonosov Moscow State University, Vorob'evy Gory, 119899 Moscow, Russia, http://fhmas.ru/ru/personal_oprunenko.htm
| | - Rémi Marchal
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS‐Universite de Rennes 1, 35042 Rennes cedex, France E‐mail: jean‐yves.saillard@univ‐rennes1.fr http://www.scienceschimiques.univ‐rennes1.fr/equipes/cti/
| | - Jean‐Yves Saillard
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS‐Universite de Rennes 1, 35042 Rennes cedex, France E‐mail: jean‐yves.saillard@univ‐rennes1.fr http://www.scienceschimiques.univ‐rennes1.fr/equipes/cti/
| | - Yuri F. Oprunenko
- Department of Chemistry, M.V. Lomonosov Moscow State University, Vorob'evy Gory, 119899 Moscow, Russia, http://fhmas.ru/ru/personal_oprunenko.htm
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73
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Cocchi C, Prezzi D, Ruini A, Caldas MJ, Molinari E. Anisotropy and size effects on the optical spectra of polycyclic aromatic hydrocarbons. J Phys Chem A 2014; 118:6507-13. [PMID: 24984100 DOI: 10.1021/jp503054j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The electronic and optical properties of polycyclic aromatic hydrocarbons (PAHs) present a strong dependence on their size and geometry. We tackle this issue by analyzing the spectral features of two prototypical classes of PAHs, belonging to D6h and D2h symmetry point groups and related to coronene as multifunctional seed. While the size variation induces an overall red shift of the spectra and a redistribution of the oscillator strength between the main peaks, a lower molecular symmetry is responsible for the appearance of new optical features. Along with broken molecular orbital degeneracies, optical peaks split and dark states are activated in the low-energy part of the spectrum. Supported by a systematic analysis of the composition and the character of the optical transitions, our results contribute in shedding light to the mechanisms responsible for spectral modifications in the visible and near UV absorption bands of medium-size PAHs.
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74
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Cardia R, Malloci G, Mattoni A, Cappellini G. Effects of TIPS-Functionalization and Perhalogenation on the Electronic, Optical, and Transport Properties of Angular and Compact Dibenzochrysene. J Phys Chem A 2014; 118:5170-7. [DOI: 10.1021/jp502022t] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- R. Cardia
- Università degli studi di Cagliari, Dipartimento di
Fisica, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
- Istituto Officina
dei Materiali (CNR - IOM), UOS di Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - G. Malloci
- Università degli studi di Cagliari, Dipartimento di
Fisica, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
- Istituto Officina
dei Materiali (CNR - IOM), UOS di Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - A. Mattoni
- Istituto Officina
dei Materiali (CNR - IOM), UOS di Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
| | - G. Cappellini
- Università degli studi di Cagliari, Dipartimento di
Fisica, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
- Istituto Officina
dei Materiali (CNR - IOM), UOS di Cagliari, Cittadella Universitaria, I-09042 Monserrato, Cagliari, Italy
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75
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Sabirov D. A correlation between the mean polarizability of the “kinked” polycyclic aromatic hydrocarbons and the number of H…H bond critical points predicted by Atoms-in-Molecules theory. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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76
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Xie Y, Shuku Y, Matsushita MM, Awaga K. Thiadiazole dioxide-fused picene: acceptor ability, anion radical formation, and n-type charge transport characteristics. Chem Commun (Camb) 2014; 50:4178-80. [PMID: 24514909 DOI: 10.1039/c3cc49500k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Yongfa Xie
- Department of Chemistry & Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.
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77
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Yadav A, Mishra P. Lowest Π–Π* electronic transitions in linear and two-dimensional polycyclic aromatic hydrocarbons: enhanced electron density edge effect. Mol Phys 2013. [DOI: 10.1080/00268976.2013.830786] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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78
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Manjavacas A, Marchesin F, Thongrattanasiri S, Koval P, Nordlander P, Sánchez-Portal D, García de Abajo FJ. Tunable molecular plasmons in polycyclic aromatic hydrocarbons. ACS NANO 2013; 7:3635-43. [PMID: 23484678 DOI: 10.1021/nn4006297] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
We show that chemically synthesized polycyclic aromatic hydrocarbons (PAHs) exhibit molecular plasmon resonances that are remarkably sensitive to the net charge state of the molecule and the atomic structure of the edges. These molecules can be regarded as nanometer-sized forms of graphene, from which they inherit their high electrical tunability. Specifically, the addition or removal of a single electron switches on/off these molecular plasmons. Our first-principles time-dependent density-functional theory (TDDFT) calculations are in good agreement with a simpler tight-binding approach that can be easily extended to much larger systems. These fundamental insights enable the development of novel plasmonic devices based upon chemically available molecules, which, unlike colloidal or lithographic nanostructures, are free from structural imperfections. We further show a strong interaction between plasmons in neighboring molecules, quantified in significant energy shifts and field enhancement, and enabling molecular-based plasmonic designs. Our findings suggest new paradigms for electro-optical modulation and switching, single-electron detection, and sensing using individual molecules.
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79
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Thamatam R, Skraba SL, Johnson RP. Scalable synthesis of quaterrylene: solution-phase 1H NMR spectroscopy of its oxidative dication. Chem Commun (Camb) 2013; 49:9122-4. [DOI: 10.1039/c3cc46270f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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80
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Wang C, Jiang L, Wang F, Li X, Yuan Y, Xiao H, Tsai HL, Lu Y. First-principles electron dynamics control simulation of diamond under femtosecond laser pulse train irradiation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:275801. [PMID: 22713291 DOI: 10.1088/0953-8984/24/27/275801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A real-time and real-space time-dependent density functional is applied to simulate the nonlinear electron-photon interactions during shaped femtosecond laser pulse train ablation of diamond. Effects of the key pulse train parameters such as the pulse separation, spatial/temporal pulse energy distribution and pulse number per train on the electron excitation and energy absorption are discussed. The calculations show that photon-electron interactions and transient localized electron dynamics can be controlled including photon absorption, electron excitation, electron density, and free electron distribution by the ultrafast laser pulse train.
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Affiliation(s)
- Cong Wang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
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81
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Petsalakis ID, Theodorakopoulos G. Molecular orbital assistance in the design of intramolecular and photoinduced electron transfer systems. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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82
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Girlando A, Masino M, Bilotti I, Brillante A, Valle RGD, Venuti E. Phonon dynamics and electron–phonon coupling in pristine picene. Phys Chem Chem Phys 2012; 14:1694-9. [DOI: 10.1039/c2cp23322c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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