nanotubes – Page 3 – TechConnect Briefs

Review of Double Wall Carbon Nanotubes, Synthesis and Applications (overview presentation)

Bacsa W., University of Toulouse, FR

We find that the Raman G band for individual double wall carbon nanotubes is split when the two walls are closely spaced or strongly coupled. We show that agglomeration of tubes into bundles leads to [...]

Solid State and Template Free Synthesis of a Nanotubular Polyaniline-TiO2 Composite

Bonnot K., Grandcolas M., Keller V., Spitzer D., ISL-CNRS, FR

Our work report on the synthesis of a novel polyaniline-titania tubular composite at nanoscale. Significant new accomplishments relies on the synthesis of polyaniline-TiO2 composite nanotubes, as up to now most researchs in this field reported [...]

Effect of doping on the radial breathing mode of carbon nanotubes

Gerber I.C., Puech P., Gannouni A., Bacsa W.S., CEMES-CNRS, FR

Doping CNTs is an attractive alternative to control the electronic conductivity of CNTs independent of their diameter. Highly conducting nanotubes are of interest for applications in transparent thin film electrodes. When doping CNTs through substitution [...]

Nano-docking stations for synfuels catalysts on carbon nanotubes

Graham U.M., Khatri R.A., Coville N.J., Dozier A., Davis B.H., University of Kentucky, US

Carbon nanotubes (CNTs) represent a distinctive class of catalyst supports and provide promising scenarios for catalytic reactions including fuel synthesis. The mobility of supported catalytic nanoparticles (NPs) on CNTs typically results in agglomeration leading to [...]

Quantum transport in nano mosfets

Lamba V.K., Engles D., Malik S.S., Gupta A., HCTM Kaithal, IN

Various quantum mechanical formulations have been used for the modeling of the carrier transport in semiconductor devices. During the 1980s advances in the semiconductor technology made it possible to fabricate conductors so small that the [...]

Adapting carbon nanotubes for fine composite structures

Shaffer M., Verdejo R., Tran M., Menner A., Bismarck A., Imperial College London, UK

Although encouraging results have been obtained for nanotube-filled polymers, significant improvements over conventional fillers have proved elusive. A critical factor is the reliance on CVD-grown material, which is available in large quantity at reasonable purity, [...]

Separation Mechanisms for Nanoscale Spheres and Rods in Field-Flow Fractionation (FFF)

Phelan Jr. F.R., Bauer B.J., NIST, US

A Brownian dynamics simulation for modeling the separation of spheres and rodlike particles in field-flow fractionation (FFF) is developed. Modeling of particle elution for spheres from (10 to 1000) nm was examined. The simulation captures [...]

Modeling and simulation of adhesion between carbon nanotubes and surfaces

Paudel N.R., Ohashi T., Dai L., Buldum A., The University of Akron, US

There have been also many experimental studies which were performed to compare the adhesion properties of carbon nanotubes with that of a gecko’s foot on smooth surfaces. Yurdumakan et al. measured the adhesive force of [...]

Chemical doping by sulfuric acid in double wall carbon nanotubes

Puech P., Ghandour A., Sapelkin A., Flahaut E., Dunstan D., Bacsa W., CEMES CNRS Univ Toulouse, FR

Charge transfer due to chemical doping in carbon nanotubes [1] can be detected through changes in the band shape and spectral shifts of the Raman G-band. In double wall carbon nanotubes, the inner tube is [...]

Parylene Nanospheres, Nanotubes & Nanocoatings for Medical and Electronics Applications

Kumar R., Greiner A., Specialty Coating Systems, US

This paper describes the methods to obtain Parylene hollow nanospheres and nanotubes, and their potential applications along with application of Parylene coatings on nanostructured substrates for functionality and reliability enhancement. Various types of spheres and [...]