We evaluated the effect of Fe/Alumina Catalyst contained different Cadmium contents and two synthesis temperatures on producing carbon nanotubes by chemical vapor deposition of methane as a feedstock.  X-ray powder diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and Thermogravimetry analysis (TGA) were u...

The excitation energy-dependent nature of Raman scattering spectrum, vibration, electronic or both, has been studied using different excitation sources on as-grown and annealed n- and p-type modulation-doped Ga1 - xInxNyAs1 - y/GaAs quantum well structures. The samples were grown by molecular beam technique with different N concentrations (y = 0%, 0.9%, 1.2%, 1.7%) at the same In concentration...

In this research zinc oxide (ZnO) nano-crystalline powders were prepared by sol-gel method using zinc acetate. The ZnO nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UV-Vis), Fourier transform infra-red (FT-IR) and energy dispersive X-ray (EDX) spectroscopy. The structure of nanoparticles was studied using XRD pattern. The c...

We analyzed the complex dielectric and Raman spectra of hydrogen-bond liquids in the microwave to terahertz frequency range. As for water and methanol, the high-frequency component of the dielectric spectrum, i.e., the small deviation from the principal Debye relaxation, clearly corresponds to the Raman spectrum. This indicates that the cooperative relaxation, accompanied by huge polarization f...

The determination of metamorphic conditions is critical to the understanding of the formation of mountain belts. However, all collisional mountain belts contain large volumes of accreted sediments generally lacking metamorphic index minerals and are therefore not amenable to conventional petrologic investigations. By contrast, these units are often rich in carbonaceous material, making it possi...

† Advanced Sensing and Optical Measurement Branch, MS 493. * National Research Council Postdoctoral Fellow, Hypersonic Airbreathing Propulsion Branch; Currently at the University College, University of New South Wales, ADFA, Canberra, ACT, Australia. + Advanced Sensing and Optical Measurement Branch, MS 493; also Graduate Student in The Department of Physics at The College of William and Mary, ...

Tip-enhanced Raman spectroscopy (TERS) has emerged as a powerful analytical tool for measuring chemical images with nanometer spatial resolution. In this paper, the application of TERS to study differentiation of SWCNT with 14 nm spatial resolution is demonstrated by the measurement of a mixture of two different types of SWCNT as the model sample. The results demonstrate that TERS is a viable t...

M. K. Tran, J. Levallois, J. Teyssier, A. B. Kuzmenko, G. Autès, O. V. Yazyev, P. Lerch, A. Ubaldini, E. Giannini, D. van der Marel, and A. Akrap Département de la Matière Condensée, University of Geneva, CH-1211 Geneva 4, Switzerland Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland Swiss Light Source, Paul Scherrer Institute, CH-5...

für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...