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Double Wall Carbon Nanotubes (double + wall_carbon_nanotube)

Distribution by Scientific Domains
Polymers and Materials Science75%

Selected Abstracts

Thermoelectrical and optical properties of double wall carbon nanotubes:polyaniline containing boron n-type organic semiconductors

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 7 2008
Fahrettin Yakuphanoglu
Abstract The electrical conductivity, thermoelectrical, and optical properties of the polyaniline containing boron/double wall carbon nanotubes (CNTs) composites have been investigated. The electrical conductivities of the composites prepared with 1%, 5%, and 8% CNT concentrations at 300,K were found to be 5.31,×,10,6, 2.72,×,10,4, and 1.12,×,10,3 (S/cm), respectively. The thermoelectrical results indicate that all the samples exhibit n-type electrical conductivity. The optical band gaps of the samples were found to be 3.71,eV for 0% DWNT, 3.32,eV for 1% DWNT, 3.15,eV for 5% DWNT, and 3.12,eV for 8% DWNT. The obtained results suggest that the electrical conductivity of PANI-B polymer is improved by DWNT doping. Copyright © 2008 John Wiley & Sons, Ltd. [source]

The two peaks G, band in carbon nanotubes

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 10 2008
Indhira O. Maciel
Abstract In this work we discuss the nature of the extra peak that appears in the low frequency side the G, band in the Raman spectra of single wall and double wall carbon nanotubes. This peak has been reported in many articles assigned as either the G, band from small diameter nanotubes or the response for fulfilment of resonance conditions with incident and scattered light. Here we show that this peak is present in the Raman spectra independently on the diameter distribution of the sample and disappears after heat treatment. We believe the lower frequency component of the two-peaks G, band in carbon nanotubes is related to the presence of defects in the carbon nanotube structure. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Thermoelectrical and optical properties of double wall carbon nanotubes:polyaniline containing boron n-type organic semiconductors

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 7 2008
Fahrettin Yakuphanoglu
Abstract The electrical conductivity, thermoelectrical, and optical properties of the polyaniline containing boron/double wall carbon nanotubes (CNTs) composites have been investigated. The electrical conductivities of the composites prepared with 1%, 5%, and 8% CNT concentrations at 300,K were found to be 5.31,×,10,6, 2.72,×,10,4, and 1.12,×,10,3 (S/cm), respectively. The thermoelectrical results indicate that all the samples exhibit n-type electrical conductivity. The optical band gaps of the samples were found to be 3.71,eV for 0% DWNT, 3.32,eV for 1% DWNT, 3.15,eV for 5% DWNT, and 3.12,eV for 8% DWNT. The obtained results suggest that the electrical conductivity of PANI-B polymer is improved by DWNT doping. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Double Wall Carbon Nanotubes with an Inner Diameter of 0.4 nm

CHEMICAL VAPOR DEPOSITION, Issue 3 2003
L. Ci
Selective preparation of double wall carbon nanotubes (DWCNTs) is achieved by a floating iron catalyst CVD method with sufur promotion. SEM shows that the product consists of entangled nanotubes. HRTEM and Raman scattering have revealed that the smallest inner diameter of as-grown carbon nanotubes is 0.4 nm (see Figure). The smallest diameter is found to be produced at the low carbon partial pressure with low sulfur content. [source]