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Multinanosensors Based on MWCNTs and Biopolymer Matrix - Production and Characterization

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Tomova A., Gentile G., Grozdanov A., Errico M., Paunović P., Avella M., Dimitrov A.
Acta Physica Polonica A
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2017
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vol. 132
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issue 4
1251-1255
EN
This study presents the results of the design and characterization of a gas sensor with PMMA/CNTs chemiresistor as sensing element for detection of organic vapors. Multi wall carbon nanotubes (MWCNTs) produced at our lab (by method of pyrolysis, outer diameter d=10÷40 nm, purity ≈94%) were incorporated into biocompatible polymer matrix. Poly(methyl methacrylate) - PMMA - and nanocomposite films were obtained using casting solution technique. Produced nanocomposite films were investigated with thermogravimetric analysis, differential scanning calorimetry, X-ray analysis, scanning electron microscopy, and Fourier transform infrared, while the sensors activity was determined by the changes in electrical resistance of the nanocomposite films due to acetone and chloroform exposure. The response to these vapors was evaluated and it was shown that PMMA/MWCNTs composites exhibit changes in electroresistivity. Sensitivity was calculated to be in 0.58-54.6 range (30 min exposed to acetone) and 0.53-10.35 (30 min exposed to chloroform). The results presented in this paper show that CNTs are able to improve the overall performances of polymer based sensors.
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Functionalization and Characterization of MWCNT Produced by Different Methods (Acta Physica Polonica A 129, 405 (2016)), ERRATUM

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Tomova A., Gentile G., Grozdanov A., Errico M., Paunović P., Avella M., Dimitrov A.
Acta Physica Polonica A
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2016
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vol. 129
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issue 6
1265
EN
The second affiliation in printed version was wrong, and the error was not spotted in proof reading. (On-line version is correct, this erratum applies to printed version only.)
3
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Functionalization and Characterization of MWCNT Produced by Different Methods

100%
Tomova A., Gentile G., Grozdanov A., Errico M., Paunović P., Avella M., Dimitrov A.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 3
405-408
EN
The subject of this study is chemical functionalization as means of structural modification of multiwalled carbon nanotubes. The main goal of the experiments was to create highest density of carboxyl groups on multiwalled carbon nanotubes surface, necessary for further nanocomposite application. Two different types of multiwalled carbon nanotubes (I: outer diameter d=50÷ 100 nm, purity ≈84%, synthesized by pyrolysis and II: outer diameter d=10÷40 nm, purity ≈94%, synthesized by chemical vapor deposition) were treated by concentrated nitric acid (HNO₃) and by alkaline mixture (NH₄OH+H₂O₂). The alkaline medium as "milder" and less aggressive than nitric acid, was expected to be less destructive and cause minimal structural damage on multiwalled carbon nanotubes surface. Structural changes due to oxidation were observed by the Raman analysis, while the ratio of the intensities of the D and G peak was used to estimate the concentration of defects. Pristine and functionalized multiwalled carbon nanotubes were characterized by thermogravimetric analysis, scanning electron microscopy, ultraviolet-visible spectroscopy and zeta (ζ) spectroscopy. The results showed that functionalization initiates changes in carbon nanotubes structure as well as in their density of states. It also results in carbon nanotubes shortening and exfoliation and decreases their agglomeration tendency. Carbon nanotubes functionalized by both acid and alkaline treatment can successfully replace conventional carbon fibers as fillers in polymer composites for sensing application.
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