Journal ArticleDOI
Band gap fluorescence from individual single-walled carbon nanotubes.
Michael J. O'Connell,Sergei M. Bachilo,Chad B. Huffman,Valerie C. Moore,Michael S. Strano,Erik H. Haroz,Kristy L. Rialon,Peter J. Boul,William H. Noon,Carter Kittrell,Jianpeng Ma,Jianpeng Ma,Robert H. Hauge,R. Bruce Weisman,Richard E. Smalley +14 more
TLDR
At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap–selective protonation of the side walls of the tube, which is readily reversed by treatment with base or ultraviolet light.Abstract:
Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst. Aggregation of nanotubes into bundles otherwise quenches the fluorescence through interactions with metallic tubes and substantially broadens the absorption spectra. At pH less than 5, the absorption and emission spectra of individual nanotubes show evidence of band gap-selective protonation of the side walls of the tube. This protonation is readily reversed by treatment with base or ultraviolet light.read more
Citations
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Journal ArticleDOI
Modulation of Single-Walled Carbon Nanotube Photoluminescence by Hydrogel Swelling
Paul W. Barone,Hyeonseok Yoon,Rene Ortiz-Garcia,Jingqing Zhang,Jin-Ho Ahn,Jong-Ho Kim,Michael S. Strano +6 more
TL;DR: In this paper, the authors demonstrate the use of hydrogel swelling as a mechanism to reversibly induce solvatochromic shifting in single-walled carbon nanotube (SWNT) near-infrared emission within a biocompatible hydragel.
Journal ArticleDOI
Incorporation of highly dispersed single-walled carbon nanotubes in a polyimide matrix
TL;DR: In this paper, single-walled carbon nanotubes (SWNTs) were first dispersed in dimethylacetamide in the presence of 1,3-bis(3-aminophenoxy)benzene (APB), which was then polymerized with 4,4′-hexafluoroisopropylidiene diphthalic anhydride (6-FDA).
Journal ArticleDOI
Water-Redispersible Isolated Single-Walled Carbon Nanotubes Fabricated by In Situ Polymerization of Micelles†
TL;DR: In this article, a noncovalent functionalization of isolated carbon nanotubes (SWNTs) is presented, which is shown to be readily redispersible even after harsh processing such as freeze-drying.
Journal ArticleDOI
Exciton-exciton annihilation in single-walled carbon nanotubes
TL;DR: In this paper, the femtosecond fluorescence and transient absorption kinetics recorded on selected semiconducting single-walled carbon nanotubes exhibit pronounced excitation-intensity-dependent decays as the result of exciton annihilation.
Journal ArticleDOI
Functionalization of carbon nanotubes with derivatized polyimide
Darron E. Hill,Yi Lin,Liangwei Qu,Alex Kitaygorodskiy,John W. Connell,Lawrence F. Allard,Ya-Ping Sun +6 more
TL;DR: In this article, single-walled and multiplewalled carbon nanotubes were functionalized with derivatized polyimide for the homogeneous dispersion of the Nanotubes, where the nanotube-bound carboxylic acids derived from the surface defects were targeted for esterification reactions with pendant hydroxyl groups.
References
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Bernard R. Brooks,Robert E. Bruccoleri,Barry D. Olafson,David J. States,S. Swaminathan,Martin Karplus +5 more
TL;DR: The CHARMM (Chemistry at Harvard Macromolecular Mechanics) as discussed by the authors is a computer program that uses empirical energy functions to model macromolescular systems, and it can read or model build structures, energy minimize them by first- or second-derivative techniques, perform a normal mode or molecular dynamics simulation, and analyze the structural, equilibrium, and dynamic properties determined in these calculations.
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Crystalline Ropes of Metallic Carbon Nanotubes
Andreas Thess,R. S. Lee,Pavel Nikolaev,Hongjie Dai,Pierre Petit,J. Robert,Chunhui Xu,Young Hee Lee,Seong-Gon Kim,Andrew G. Rinzler,Daniel T. Colbert,Gustavo E. Scuseria,David Tománek,John E. Fischer,Richard E. Smalley +14 more
TL;DR: X-ray diffraction and electron microscopy showed that fullerene single-wall nanotubes (SWNTs) are nearly uniform in diameter and that they self-organize into “ropes,” which consist of 100 to 500 SWNTs in a two-dimensional triangular lattice with a lattice constant of 17 angstroms.
Book
Science of fullerenes and carbon nanotubes
TL;DR: In this paper, the authors present a detailed overview of the properties of Fullerenes and their properties in surface science applications, such as scanning tunnel microscopy, growth and fragmentation studies, and chemical synthesis.
Journal ArticleDOI
Constant pressure molecular dynamics simulation: The Langevin piston method
TL;DR: In this paper, a new method for performing molecular dynamics simulations under constant pressure is presented, which is based on the extended system formalism introduced by Andersen, the deterministic equations of motion for the piston degree of freedom are replaced by a Langevin equation; a suitable choice of collision frequency then eliminates the unphysical "ringing" of the volume associated with the piston mass.