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Experimental results from irradiated-carbon nanostructures can be partially explained by selective applications of classical damage theories and ad-hoc thermal models by treating the binary atomic collision cascades and multi-atomic thermal…

Mesoscale and Nanoscale Physics · Physics 2019-10-03 Shoaib Ahmad

Energetic ion irradiation is an effective method for studying how single and multi-shelled carbon nanotubes break apart. The energy from ions is dissipated through both linear and nonlinear processes in the nanotubes, leading to defect…

Mesoscale and Nanoscale Physics · Physics 2025-11-20 Sumera Javeed , Shoaib Ahmad

Linear and nonlinear dissipative structures emerge in the irradiated single and multi walled carbon nano-tubes in the form of collision cascades and thermal spikes. These are diagnosed by the information theoretic tools of fractal dimension…

Mesoscale and Nanoscale Physics · Physics 2019-02-08 Shoaib Ahmad , Sumera Javeed

Single walled carbon nanotubes of 2 nm diameter and 3 to 13 micro meter length were compressed in Cu bullets and irradiated with positive ions of Cs with energies from 0.2 to 2.0 keV and subjected to successively increasing Cs dose. From…

Mesoscale and Nanoscale Physics · Physics 2016-09-23 Sumera Javeed , Sumaira Zeeshan , Shoaib Ahmad

An information-theoretic model describes the dissipative dynamical systems composed of ensembles of fragmenting, self-organizing fullerenes. The probabilities derived from the variations of the fullerene number densities that occur during…

Mesoscale and Nanoscale Physics · Physics 2018-10-16 Shoaib Ahmad

The results from mass spectrometry of clusters sputtered from Cs+ irradiated single-walled carbon nano-tubes (SWCNTs) as a function of energy and dose identify the nature of the resulting damage in the form of multiple vacancy generation.…

Atomic and Molecular Clusters · Physics 2016-10-05 Sumera Javeed , Sumaira Zeeshan , Shoaib Ahmad

We report and provide justification for the consistently observed four experimental facts of the mass spectrometric data of carbon cluster emission from the low-energy Cs irradiated single-walled carbon nanotubes . Firstly, the diatomic…

Mesoscale and Nanoscale Physics · Physics 2017-07-05 Sumera Javeed , Shoaib Ahmad

We present a detailed comparison between theoretical predictions on electron scattering processes in metallic single-walled carbon nanotubes with defects and experimental data obtained by scanning tunneling spectroscopy of Ar$^+$ irradiated…

Mesoscale and Nanoscale Physics · Physics 2011-04-28 D. Bercioux , G. Buchs , H. Grabert , O. Groening

Experiments with multiwalled carbon nanotubes and graphite as targets in a source of negative ions with cesium sputtering have shown that nanotubes with nanometer radii and micrometer length can be compared with micrometer size graphite…

The statistical properties of physical systems in thermal equilibrium are blatantly different from their far-from-equilibrium counterparts. In the latter, fluctuations often dominate the dynamics and might cluster in ordered patterns in the…

We characterized the energy band dispersion near the Fermi level in single-walled carbon nanotubes using low-temperature scanning tunneling microscopy. Analysis of energy dependent standing wave oscillations, which result from quantum…

Mesoscale and Nanoscale Physics · Physics 2009-11-07 Min Ouyang , Jin-Lin Huang , Charles M. Lieber

We deploy Shannon's information entropy to the distribution of branching fractions in a particle decay. This serves to quantify how important a given new reported decay channel is, from the point of view of the information that it adds to…

We have studied the electronic structure and charge-carrier dynamics of individual single-wall carbon nanotubes (SWNTs) and nanotube ropes using optical and electron-spectroscopic techniques. The electronic structure of semiconducting SWNTs…

Materials Science · Physics 2009-11-10 A. Hagen , G. Moos , V. Talalaev , J. W. Tomm , T. Hertel

We present a multispectroscopic structural study of various nanotube samples with different tube diameters. We determine for each sample the mean bundle and tube diameter as well as the tube diameter distribution. The possibility to work on…

Other Condensed Matter · Physics 2007-05-23 Nicolas Izard , Didier Riehl , Eric Anglaret

The general idea of information entropy provided by C.E. Shannon "hangs over everything we do" and can be applied to a great variety of problems once the connection between a distribution and the quantities of interest is found. The Shannon…

Nuclear Theory · Physics 2018-02-20 Chun-Wang Ma , Yu-Gang Ma

We report a detailed analysis of the optical properties of single wall carbon nanotubes with different mean diameters as produced by laser ablation. From a combined study of optical absorption, high resolution electron energy-loss…

Materials Science · Physics 2009-11-07 X. Liu , T. Pichler , M. Knupfer , M. S. Golden , J. Fink , H. Kataura , Y. Achiba

Single-walled carbon nanotubes are hollow cylinders, that can grow centimeters long by carbon incorporation at the interface with a catalyst. They display semi-conducting or metallic characteristics, depending on their helicity, that is…

Materials Science · Physics 2018-11-14 Yann Magnin , Hakim Amara , François Ducastelle , Annick Loiseau , Christophe Bichara

We present a detailed electron diffraction study of individual single-walled carbon nanotubes. A novel sample preparation procedure provides well-separated, long and straight individual single-shell nanotubes. Diffraction experiments are…

Materials Science · Physics 2007-05-23 Jannik C. Meyer , Matthieu Paillet , Georg S. Duesberg , Siegmar Roth

Macroscopic fibres of carbon nanotubes are hierarchical structures combining long building blocks preferentially oriented along the fibre axis and a large porosity arising from the imperfect packing of bundles. Synchrotron small-angle X-ray…

Carbon nanotubes have been observed to emit ultraviolet, visible, and infrared radiation when exposed to microwave fields. We have performed experiments in which both single-walled (~1 nm diameters) and multi-walled carbon nanotubes (>50 nm…

Materials Science · Physics 2015-06-04 S. Ferguson , N. McGara , B. Cavness , D. Gonzales , S. Williams
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