Thermal and Electrical Properties of Carbon Nanotube Based Materials

Abstract

In this study, carbon nanotubes were synthesized at temperatures of 500• C and 800• C by the uidized--bed chemical vapor deposition method. The synthesized material was puried by using 3 M HCl at 75• C, 15 h. After synthesis and purication, the polyaniline-doped H3BO3 and BF3 and composites were prepared by coagulation method. Transmission electron microscope and Fourier transform infrared spectroscopy were used to characterize the carbon nanotubes and their composites. Thermal stabilities were measured by thermogravimetry and dierential scanning calorimetry instruments. The thermogravimetry and derivative thermogravimetry curves indicated that the thermal stability of polyaniline-doped H3BO3 and BF3 increased with carbon nanotube doping. The electrical properties of carbon nanotubes and their composites were also determined. The obtained electrical conductivity values of the nanocomposites including the polyaniline-doped H3BO3 and BF3 were typical for organic semiconductor materials. It can be evaluated that the electrical properties of the polyaniline based polymers can be controlled by carbon nanotube doping.

Improvement in Electrode Performance of Novel SWCNT Loaded Three-Dimensional Porous RVC Composite Electrodes by Electrochemical Deposition Method

“…Furthermore, the M band appearing at about 1755 cm −1 is a second-order peak tentatively assigned to a combination mode of the G and the radial breathing mode (RBM) bands [ 32 , 33 ]. The radial breathing mode (RBM) can be used to determine the nanotube diameter ( d t ) through its frequency ( ω RBM) [ 35 , 36 ]. These features are unique to carbon nanotubes and occur at frequencies between 120 and 350 cm −1 for SWCNT for diameters in the range ω RBM = A /d t + B, where A = 234 cm −1 nm and B = 10 cm −1 , and where B is an upshift in ω RBM assigned to tube-tube interactions.…”

“…These features are unique to carbon nanotubes and occur at frequencies between 120 and 350 cm −1 for SWCNT for diameters in the range ω RBM = A /d t + B, where A = 234 cm −1 nm and B = 10 cm −1 , and where B is an upshift in ω RBM assigned to tube-tube interactions. For typical SWNT bundles in the diameter range d t = 1.5 ± 0.2 nm and if the nanotube diameter is greater than 2 nm, the RBM spectrum is difficult to observe [ 32 , 35 , 36 ]. Hence, the mean diameter of SWCNT can be calculated by Equation (1); d t = 248/ ω …”

Diagnostic of the Decomposition of Sulphur Hexafluoride (SF6) in Gas-Insulated Equipment, Due to Partial Discharges, Using Hollow Carbon Nanotubes

“…Carbon nanotubes (CNT) have received considerable attention in the field of electrochemical sensing, due to their unique structural, electronic and chemical properties, such as, for instance, unique tubular nanostructure, large specific surface, excellent conductivity, modifiable sidewall and good biocompatibility [2][3][4][5][6][7][8][9]. Recently, interest in CNT has been rapidly growing in various scientific and engineering fields because of their fast response [10][11][12][13], higher sensitivity, lower operating temperature and a wider variety of detectable gases [14].…”

Improved carbon nanostructures as a novel catalyst support in the cathode side of PEMFC: a critical review

“…Many published papers have reviewed the different methods for producing CNTs and have described a variety of methods for their purification [87][88][89]. In 2011, Yuca et al [90] investigated the influence of different purification methods on thermal stability and electrical conductivity of CNTs; the ability to control these two properties is an important factor in fuel cell performance.…”