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
Recent development on carbon based heterostructures for their applications in energy and environment: A review
Theerthagiri Jayaraman,Arun Prasad Murthy,V. Elakkiya,Sivaraman Chandrasekaran,P. Nithyadharseni,Ziyauddin Khan,Raja Arumugam Senthil,Ravi Shanker,M. Raghavender,Parasuraman Kuppusami,Madhavan Jagannathan,Muthupandian Ashokkumar +11 more
TL;DR: In this article, a review of the recent developments in carbon-based heterostructures for their applications in energy and environment is presented, where special consideration has been paid on the applications in dye-sensitized solar cells, hydrogen evolution reaction, oxygen evolution reaction and Li-ion battery, supercapacitor.
Journal ArticleDOI
Carbon nanotubes as templates for one-dimensional nanoparticle assemblies
TL;DR: In this article, a simple and generally applicable procedure for the assembly of nanoparticles on carbon nanotubes in aqueous solution is presented. The method makes use of polyelectrolytes for wrapping carbon nanotsubes and providing them with adsorption sites for electrostatically driven nanoparticle deposition.
Journal ArticleDOI
Multifunctional Biomedical Imaging in Physiological and Pathological Conditions Using a NIR-II Probe
Kangquan Shou,Kangquan Shou,Chunrong Qu,Chunrong Qu,Yao Sun,Yao Sun,Hao Chen,Si Chen,Lei Zhang,Haibo Xu,Xuechuan Hong,Aixi Yu,Zhen Cheng +12 more
TL;DR: The results of this study indicate that the NIR‐II vesicle CQS1000 can noninvasively and dynamically visualize and monitor many physiological and pathological conditions of circulatory systems, including lymphatic drainage and routing, angiogenesis of tumor, and vascular deformity such as arterial thrombus formation and ischemia with high spatial and temporal resolution.
Journal ArticleDOI
Single-Wall Carbon Nanotube Films for Photocurrent Generation. A Prompt Response to Visible-Light Irradiation
TL;DR: In this paper, a low photon-to-current conversion efficiency of 1.5% suggests that most of the photogenerated charge carriers are lost in the recombination process, and transient absorption experiments confirm the charge separation following the laser-pulse excitation of SWCNTs.
Journal ArticleDOI
Recent advances in reactive oxygen species measurement in biological systems.
TL;DR: Improvements to fluorescent ROS dye technologies, genetically encoded ROS reporters, nanoparticle delivery systems, and nanotube ROS probes are discussed, which improve specificity, localization and sensitivity over previously available ROS probes.
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.