13 citations · 48 across the 10 of their papers we have counts for
10 papers
Experimental and Theoretical Aspects of the Fragmentation of Carbon's Single and Multi-Walled Nanotubes
Sumera Javeed, 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…
Multi scaling of Fractal Dimension and Relative Entropy as Diagnostic Tools for Irradiated Carbon Nano-tubes
Shoaib Ahmad, Sumera Javeed
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 diagn…
Space-filling, multi-fractal, localized thermal spikes in silicon, germanium and zinc oxide
Shoaib Ahmad, Muhammad Sabtain Abbas, Muhammad Yousuf +3
The mechanism responsible for the emission of clusters from heavy ion irradiated solids is proposed to be thermal spikes. Collision cascade-based theories describe atomic sputterin…
An information theoretic model for the linear and nonlinear dissipative structures in irradiated single-walled carbon nanotubes
Afshan Ashraf, Sumera Javeed, Sumaira Zeeshan +2
Experiments with irradiated single-walled carbon nanotubes are shown to generate a set of probability distribution functions and to derive a set of information theoretic entropy-ba…
Thermal spikes induced sublimation of carbon nanotubes
Sumera Javeed, 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 irradiate…
Dynamics of fragmentation and multiple vacancy generation in irradiated single-walled carbon nanotubes
Sumera Javeed, Sumaira Zeeshan, 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 re…
Amorphous carbon films in direct current magnetron sputtering from regenerative sooting discharge
Sumera Javeed, Sumera Yamin, Sohail Ahmad Janjua +6
We present results of carbon coatings on metal substrates in cylindrical hollow cathode (CHC) direct current magnetron sputtering. This is a new technique of making amorphous carbo…
Cs+ sputtered clusters from multi-walled carbon nanotubes and graphite
Shoaib Ahmad, Sumera Javeed, Sumaira Zeeshan +6
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 microme…
Irradiation induced vacancy creation in single walled carbon nanotubes
Sumera Javeed, Sumaira Zeeshan, Shoaib Ahmad
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 k…
Mass spectrometric identification of C60 fragmentation regimes under energetic Cs+ bombardment
Sumaira Zeeshan, Sumera Javeed, Shoaib Ahmad
Three C60 fragmentation regimes in fullerite bombarded by Cs+ are identified as a function of its energy. C2 is the major species sputtered at all energies. For E(Cs+) < 1 keV C2 e…