Bending of multiwalled carbon nanotubes over gold lines

Abstract

We have investigated an experimentally moderate bending of multiwalled carbon nanotubes (MWNTs) in the perpendicular direction from flat substrates. The tubes were in the diameter range of 3–13nm and deposited over lithographically fabricated gold lines whose height determined the total bending. In our model for the bending profile we take into account the van der Waals attraction between the substrate and the MWNT and the opposing elastic bending force. With reasonable parameters for the competing forces we obtain an agreement between the model and the experimental data for the critical distance between two adjacent lines when the van der Waals attraction can no longer prevent elastic forces from straightening the tube to a suspended position between the lines. However, for the smallest nanotubes a simple classical model is clearly insufficient.

Negative Differential Resistance in Carbon Nanotube Field-Effect Transistors with Patterned Gate Oxide

“…The total thickness of this oxide stack is measured with AFM to be ∼0.5 nm. The heights of the ALD islands are smaller than the radius of the studied tubes which makes it unlikely to induce any suspended section in the CNTs. − Precursors used were titanium tetrachloride (TiCl 4 ) and water for TiO 2 growth and tetrakis(ethylmethylamino)hafnium (TEMA-Hf) and water for HfO 2 growth, both done at a deposition temperature of 100 °C. These ALD grown oxides were chosen due to the specific charge trapping within the oxide stack, ease of patterning of the oxides, and high control of the properties of the oxides with the ALD process. , …”

Determination of Hamaker constant for CNT and AFM probe configuration inside SEM

“…The Hamaker constants for CNT and Au‐coated configuration, from three other research groups [18–20], are given in Table 2, which is used to compare with the Hamaker constant value determined by our AFM–SEM‐based nanoscale robotic manipulator method. However, due to the great influence of environmental factors [21] including the temperature and vacuum of SEM, the Hamaker constants measured by experiments are quite different.…”

Nanoassembly of Nanostructures by Cutting, Bending and Soldering of Carbon Nanotubes with Electron Beam

“…[32][33][34][35]. Based on these the bending of CNTs is assumed to have three typical configurations: rippling, 36 bulking 37 and pentagon-heptagon mode.…”