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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Covalent Functionalization of Single-Walled Carbon Nanotubes for Materials Applications
TL;DR: Covalent functionalization of single-walled carbon nanotubes (SWNTs) has been employed to increase the solubility of these materials, which allows for the manipulation and processing of these otherwise insoluble carbon-notubes as mentioned in this paper.
Journal ArticleDOI
Ag2S Quantum Dot: A Bright and Biocompatible Fluorescent Nanoprobe in the Second Near-Infrared Window
TL;DR: The cytotoxicity study illustrates the Ag(2)S QDs with negligible effects in altering cell proliferation, triggering apoptosis and necrosis, generating reactive oxygen species, and causing DNA damage as well as their high emission efficiency in the unique NIR-II imaging window.
Journal ArticleDOI
Liquid‐Phase Exfoliation of Nanotubes and Graphene
TL;DR: In this paper, a review of recent work in this area is presented, focusing on results from the author's group, and it is concluded that functionalized nanotubes can be exfoliated to the greatest degree.
Journal ArticleDOI
Non-blinking and photostable upconverted luminescence from single lanthanide-doped nanocrystals
Shiwei Wu,Gang Han,Delia J. Milliron,Shaul Aloni,Virginia Altoe,Dmitri V. Talapin,Bruce E. Cohen,P. James Schuck +7 more
TL;DR: In this article, the authors show that individual lanthanide-doped upconverting nanoparticles (UCNPs) with multiple Yb3+ and Er3+ dopants exhibit bright anti-Stokes visible upconverted luminescence with exceptional photostability when excited by a 980nm continuous wave laser.
Journal ArticleDOI
Dispersion of Single-Walled Carbon Nanotubes in Aqueous Solutions of the Anionic Surfactant NaDDBS
Olga Matarredona,Heather Rhoads,Zhongrui Li,Jeffrey H. Harwell,Leandro Balzano,Daniel E. Resasco +5 more
TL;DR: In this article, the authors investigated the effects of chemical modifications of the surface on the extent of nanotube-surfactant interaction and found that intrinsic surface properties such as the PZC (point of zero charge) are greatly affected by the purification method.
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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Journal ArticleDOI
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.