Journal ArticleDOI
Transport and noise spectroscopy of MWCNT/HDPE composites with different nanotube concentrations
TLDR
In this article, the authors measured the low-frequency noise spectra of multiwall carbon nanotubes in high-density polyethylene matrix in a temperature range between 10 and 300K.Abstract:
Electrical current transport and low-frequency noise spectra of multiwall carbon nanotubes in high-density polyethylene matrix have been measured in a temperature range between 10 and 300K. The dc electrical investigations suggest that these composites can be regarded as a random resistor network, where the resistors are formed by tunnel junctions between carbon nanotubes. A crossover of the conduction from a low-field to a high-field regime is found in current-voltage characteristics. In particular, the high-field regime has a strong dependence on carbon nanotube concentration. Noise measurements reveal a standard 1/f behavior due to resistance fluctuations. However, in samples with different concentration of nanotubes, an unusual temperature dependence of the noise is observed. The samples with higher percentage of nanotubes seem to be the most promising ones for devices application, since their noise level is lower in the whole investigated temperature range.read more
Citations
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Journal ArticleDOI
Unravelling the low-temperature metastable state in perovskite solar cells by noise spectroscopy.
Carlo Barone,Felix Lang,C. Mauro,Giovanni Landi,Jörg Rappich,Norbert H. Nickel,Bernd Rech,Sergio Pagano,Heinrich Christoph Neitzert +8 more
TL;DR: The hybrid perovskite methylammonium lead iodide CH3NH3PbI3 recently revealed its potential for the manufacturing of low-cost and efficient photovoltaic cells and electric noise spectroscopy shows that the dynamics of fluctuations detect the existence of a metastable state in a crossover region between the room-temperature tetragonal and the low-tem temperature orthorhombic phases of the perovkite compound.
Journal ArticleDOI
The effect of the nanotube oxidation on the rheological and electrical properties of CNT/HDPE nanocomposites
Maria Rossella Nobile,O. Valentino,Melanie Morcom,George P. Simon,Giovanni Landi,Heinrich Christoph Neitzert +5 more
TL;DR: In this article, the morphological, rheological and electrical properties of nanocomposites based on multi-walled carbon nanotubes (MWNTs) and high density polyethylene (HDPE), prepared by melt mixing, have been investigated.
Journal ArticleDOI
Universal crossover of the charge carrier fluctuation mechanism in different polymer/carbon nanotubes composites
TL;DR: In this paper, the dc and electrical noise characteristics of different polymer/carbon nanotubes composites have been analyzed from 10 to 300 K. The results suggest that all these systems can be regarded as random resistive networks of tunnel junctions formed by adjacent carbon nanotsubes, and that contributions deriving from other possible mechanisms cannot be separated using dc information alone.
Journal ArticleDOI
Percolation Conduction of Carbon Nanocomposites.
TL;DR: A model description presented of such a behavior based on the quasi-classical approach to the problem of electron tunneling through the barrier formed by the electric field, and the calculation results correspond qualitatively to the available experimental data are considered.
Journal ArticleDOI
What Can Electric Noise Spectroscopy Tell Us on the Physics of Perovskites
Carlo Barone,Sergio Pagano +1 more
TL;DR: In this article, the results from a detailed electrical transport and noise characterizations for each of the above mentioned materials, and they are interpreted in terms of specific physical models, evidencing peculiar properties, such as quantum interference effects and charge density waves.
References
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Dispersion and alignment of carbon nanotubes in polymer matrix: A review
TL;DR: In this article, the authors review recent progress and advances that have been made on: (a) dispersion of CNTs in a polymer matrix, including optimum blending, in situ polymerization and chemical functionalization; and (b) alignment of CNNs in the matrix enhanced by ex situ techniques, force and magnetic fields, electrospinning and liquid crystalline phase-induced methods.