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
More filters
Journal ArticleDOI
Bioaccumulation and toxicity of single‐walled carbon nanotubes to benthic organisms at the base of the marine food chain
Ashley N. Parks,Lisa M. Portis,P. Ariette Schierz,Kate M. Washburn,Monique M. Perron,Robert M. Burgess,Kay T. Ho,G. Thomas Chandler,P. Lee Ferguson +8 more
TL;DR: Results indicate that single-walled carbon nanotubes are bioaccessible to marine benthic organisms but do not appear to accumulate or cause toxicity.
Journal ArticleDOI
In vivo biodistribution and biological impact of injected carbon nanotubes using magnetic resonance techniques
Achraf Al Faraj,Florence Fauvelle,Nathalie Luciani,Ghislaine Lacroix,Michael Levy,Yannick Crémillieux,Emmanuelle Canet-Soulas +6 more
TL;DR: Noninvasive in vivo magnetic resonance imaging investigations combined with high-resolution magic angle spinning, Raman spectroscopy, iron assays, and histological analysis ex vivo were proposed and applied to assess the biodistribution and biological impact of intravenously injected pristine and functionalized SWCNT in a 2-week longitudinal study.
Journal ArticleDOI
Fabrication of discrete nanoscaled force sensors based on single-walled carbon nanotubes
TL;DR: In this article, a fabrication technique for discrete, released carbon-nanotube-based nanomechanical force sensors is presented, which uses prepatterned coordinate markers to align the device design to predeposited single-walled carbon nanotubes (SWNTs).
Journal ArticleDOI
Non-Covalent Functionalization of Individual Nanotubes with Spiropyran-Based Molecular Switches
TL;DR: In this article, single-walled carbon nanotubes (SWCNTs) are functionalized with a spiropyran derivative, which is attached non-covalently to the SWCNT's sidewall via a pyrene anchor group.
Journal ArticleDOI
Synergistic effect of chemo-photothermal for breast cancer therapy using folic acid (FA) modified zinc oxide nanosheet
TL;DR: The findings of the present study provided an ideal drug delivery system for breast cancer therapy due to the advanced chemo-photothermal synergistic targeted therapy and good drug release properties of DOX-FA-PEG-ZnO NS, which could effectively avoid frequent and invasive dosing and improve patient compliance.
References
More filters
Journal ArticleDOI
CHARMM: A program for macromolecular energy, minimization, and dynamics calculations
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.
Journal ArticleDOI
MOLSCRIPT: a program to produce both detailed and schematic plots of protein structures
TL;DR: The MOLSCRIPT program as discussed by the authors produces plots of protein structures using several different kinds of representations, including simple wire models, ball-and-stick models, CPK models and text labels.
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.