No abstract

No abstract

No abstract

No abstract

A study on the electrical behavior of polymer composites based on multi-walled carbon nanotubes (MWCNT) under the application of hydrostatic pressure up to 9 GPa and at room temperature is reported. A higher resistance, with values of order of kΩ, is demonstrated for MWCNT with an aspect ratio R9GPa/Rint ≈7. Our observations also show that pressure induced a structural change of the MWCNT to an ellipsoid shape at P ∼ 1–1.5 GPa—a measurement that correlates rather well with theoretical predictions. By direct and reverse high-pressure measurements of resistance, as well as current-voltage characteristics, we have identified the reversibility of electrophysical properties. Our observations suggest that the polymer composite based on MWCNT is a promising material for pressure sensing devices.

No abstract

The temperature dependences of the intensity and spectral characteristics of the steady‐state photoluminescence in vitreous and monocrystalline As2Se3 are studied over the range 4 to 150 °K. The interpretation of the experimental data is based on the idea about the existence of a band of deep levels in the gap of both the glass and the crystal which are responsible for the radiation. It is concluded that the disorder leads to the disappearance of the centres which are capable of taking part in the nonradiative recombination at low temperatures.

No abstract