nanotube – Page 5 – TechConnect Briefs

Mimicking Photosynthesis to Make Functional Nanostructures and Nanodevices

Shelnutt J.A., Wang Z., Song Y., Medforth C.J., Pereira E., Sandia National Laboratories, US

Photocatalytic porphyrins are used to reduce metal complexes from aqueous solution and, further, to control the deposition of metals onto porphyrin nanotubes and surfactant assembly templates to produce metal composite nanostructures and nanodevices. For example, [...]

Development of a Biologically Enhanced Carbon Nanotube Based Composite

Parker R., O’Neal R., Fisher D., Davey Kirk, Liang R., Edwards J., Florida A&M University, US

Composite materials continue to be important to the evolution of human space flight activity. The low weight/high strength ratio and thermal properties of carbon based composite materials in particular that make them well suited for [...]

Nanoelectronic CO2 Breath Sensors

Star A., Joshi V., Thomas D., Niemann J., Gabriel J.-C.P., Valcke C., Nanomix Inc, US

The measurement of carbon dioxide levels in respiration is a standard of care or guideline according to the American Heart Association, the American Association of Respiratory Care, and the American Society of Anesthesiologists, and is [...]

Assisted Alignement of Carbon Nanotubes

Haik Y., Chatterjee J., Chen C-J., Bimagnetic Engineering Lab, US

Extensive research has been focused on the processing of carbon nanotubes polymeric composites. The ability to impose a preferred alignment of carbon nanotubes in a composite will increase the effectiveness of utilizing nanotubes in composite [...]

Noncovalent Engineering of Carbon Nanotube Surfaces

Chen J., Ramasubramaniam R., Liu H., Zyvex Corporation, US

Single-walled carbon nanotubes (SWNTs), due to their novel structural, thermal, electrical, mechanical and optical properties, are expected to find applications in many fields. Pristine SWNTs are generally insoluble in common solvents, and difficult to functionalize [...]

Principles of Metallic Field Effect Transistor (METFET)

Rotkin S.V., Hess K., University of Illinois at Urbana-Champaign, Beckman Institute for Advanced Science and Technology, US

Field effect transistors in current use are semiconductor devices. The scaling trend to nanometer dimensions calls for ever higher doping and channel conductance of these devices. Ultimately one desires a conductance close to that of [...]

Mechanical Properties of SiC Nanotubes

Moon W.H., Ham J.K., Hwang H-J., Chung-Ang University, KR

We investigate the mechanical properties of SiC nanotubes using molecular dynamics simulation. We find that SiC nanotubes are less stiff than the other nanotubes considered so far, such as BN or C nanotubes. However, Youngs [...]

Variation of Contact Barrier Height in Metal-Semiconducting Carbon Nanotube Junctions using a Localized Gate

Gallo E., Nabet B., Freitag M., Johnson A.T., Drexel University, US

We have previously succeeded in modulating current in a carbon nanotube FET device due to the presence of a potential on an AFM tip. Symmetric I-V is observed with no tip, however, the tip has [...]

Charge Islands Through Tunneling

Robinson D.C., NASA Glenn Research Center, US

It has been recently reported that the electrical charge in a semiconductive carbon nanotube is not evenly distributed, but rather it is divided into charge “islands” [1,2]. This paper links the aforementioned phenomenon to tunneling [...]

Effects of Structural Deformation and Tube Chirality on Electronic Conductance of Carbon Nanotubes

Svizhenko A., Maiti A., Anantram M.P., NASA Ames Research Center, US

A combination of large scale classical force-field (UFF), density functional theory (DFT) and tight-binding Green’s function transport calculations is used to study the electronic properties of carbon nanotubes under the twist, bending and AFM-tip deformation. [...]