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
High performance in vivo near-IR (>1 μm) imaging and photothermal cancer therapy with carbon nanotubes
Joshua T. Robinson,Kevin Welsher,Scott M. Tabakman,Sarah P. Sherlock,Hailiang Wang,Richard Luong,Hongjie Dai +6 more
TL;DR: This work demonstrates the first dual application of intravenously injected SWNTs as photoluminescent agents for in vivo tumor imaging and as NIR absorbers and heaters at 808 nm for photothermal tumor elimination at the lowest injected dose and laser irradiation power reported to date.
Journal ArticleDOI
Recent Advances of Optical Imaging in the Second Near-Infrared Window
Kenry,Yukun Duan,Bin Liu +2 more
TL;DR: The importance of biological imaging in the NIR‐II spectral region is highlighted, the emergence and latest development of various Nir‐II fluorescence and PA imaging probes and their applications are discussed, and Perspectives on the promises and challenges facing this nascent yet exciting field are given.
Journal ArticleDOI
Analysis of engineered nanomaterials in complex matrices (environment and biota): General considerations and conceptual case studies
Frank von der Kammer,P. Lee Ferguson,Patricia A. Holden,Armand Masion,Kim R. Rogers,Stephen J. Klaine,Albert A. Koelmans,Nina Horne,Jason M. Unrine +8 more
TL;DR: Development of techniques for extraction, cleanup, separation, and sample storage that introduce minimal artifacts to increase the speed, sensitivity, and specificity of analytical techniques, as well as the development of techniques that can differentiate between abundant, naturally occurring particles, and manufactured nanoparticles are needed.
Journal ArticleDOI
Ultrafast fluorescence imaging in vivo with conjugated polymer fluorophores in the second near-infrared window
Guosong Hong,Yingping Zou,Alexander L. Antaris,Shuo Diao,Di Wu,Kai Cheng,Xiaodong Zhang,Changxin Chen,Bo Liu,Yuehui He,Justin Z. Wu,Jun Yuan,Bo Zhang,Zhimin Tao,Chihiro Fukunaga,Hongjie Dai +15 more
TL;DR: A series of low-bandgap donor/acceptor copolymers with tunable emission wavelengths of 1,050-1,350 nm allows for in vivo, deep-tissue and ultrafast imaging of mouse arterial blood flow with an unprecedented frame rate of >25 frames per second.
Patent
Printed assemblies of ultrathin, microscale inorganic light emitting diodes for deformable and semitransparent displays
TL;DR: In this article, a number of printable structures and methods for assembling electronic devices where one or more device components are embedded in a polymer which is patterned during the embedding process with trenches for electrical interconnects between device components.
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.