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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Adsorption of glucose oxidase onto single-walled carbon nanotubes and its application in layer-by-layer biosensors.
Ta Wei Tsai,Gustavo Heckert,Luis F F Neves,Yongqiang Tan,Der You Kao,Roger G. Harrison,Daniel E. Resasco,David W. Schmidtke +7 more
TL;DR: The use of a sodium cholate suspension-dialysis method to adsorb the redox enzyme glucose oxidase (GOX) onto single-walled carbon nanotubes (SWNT) and it is demonstrated that GOX-SWNT conjugates can be assembled into amperometric biosensors with a layer-by-layer (LBL) self-assembly process.
Journal ArticleDOI
Mechanical properties of chitosan/CNT microfibers obtained with improved dispersion
Geoffrey M. Spinks,Su Ryon Shin,Gordon G. Wallace,Philip G. Whitten,Sun I. Kim,Seon Jeong Kim +5 more
TL;DR: In this article, composite fibers composed of chitosan and single-wall carbon nanotubes (CNTs) have been fabricated with a wet spinning method, and the dispersion was improved by sonic agitation of CNTs in a chitosa solution and then centrifugation to remove tube aggregates and residual catalyst.
Journal ArticleDOI
Multiplexed five-color molecular imaging of cancer cells and tumor tissues with carbon nanotube Raman tags in the near-infrared
Zhuang Liu,Scott M. Tabakman,Sarah P. Sherlock,Xiaolin Li,Zhuo Chen,Kaili Jiang,Shou-Shan Fan,Hongjie Dai +7 more
TL;DR: Ex vivo multiplexed Raman imaging of tumor samples uncovers a surprising up-regulation of epidermal growth factor receptor (EGFR) on LS174T colon cancer cells from cell culture to in vivo tumor growth.
Journal ArticleDOI
Preparation and thermal energy storage behaviour of stearic acid-TiO2 nanofluids as a phase change material for solar heating systems
TL;DR: In this article, the phase change behavior of newly prepared stearic acid-TiO2 nanofluids as composite phase change materials (PCMs) was investigated, and the complete melting and solidification times were reduced by 7.03, 12.56, 19.62, 13.57, 20.53, 26.82, 34.17, 43.64, 35.39% for 0.
Journal ArticleDOI
Atomic force microscopy studies of DNA-wrapped carbon nanotube structure and binding to quantum dots.
TL;DR: This work demonstrates the useful functionalization of CNTs with quantum dots in a manner that avoids direct, destructive modification of the CNT surface and suggests nearly complete surface coverage of the nanotubes with DNA.
References
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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.