TY - JOUR
T1 - The effect of CNT functionalization on electrical and relaxation phenomena in MWCNT/chitosan composites
AU - Zarate-Triviño, D. G.
AU - Prokhorov, E.
AU - Luna-Bárcenas, G.
AU - Mendez-Nonell, J.
AU - González-Campos, J. B.
AU - Elizalde-Peña, E.
AU - Mota-Morales, Josué D.
AU - Santiago-Jacinto, P.
AU - Terrones, M.
AU - Gómez-Salazar, S.
AU - Nuño-Donlucas, S. M.
AU - Sanchez, I. C.
N1 - Funding Information:
This work was partially supported by CONACYT of Mexico. The authors are grateful to J.A. Muñoz-Salas for technical assistance in electrical measurements, A. Mauricio for assistance in FTIR measurements. The authors also thank to Dr. Vicente Garibay for TEM facilities and Dr. Guadalupe Zavala for her technical assistance in the sample preparation process.
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - The effect of the type of CNT (functionalized and non-functionalized) on the dielectric relaxation phenomena and conductivity of MWCNT/chitosan (MWCNT/CS) was investigated. Composites were prepared by the solvent cast method by homogeneously dispersing CNT into a CS matrix. FTIR analysis suggests the formation of hydrogen bonding in functionalized-MWCNT/CS whereas the CS remains unaffected in non-functionalized films. In the low conductivity region, the α-relaxation process associated with a glass transition in CS is affected by the MWCNT; the Vogel temperature increases due to a decrease of the water content. The σ-relaxation exhibits a typical Arrhenius-type temperature dependence that is independent on the moisture content. Strong interfacial interactions of functionalized-MWCNT with the CS matrix are responsible for high values of the contact resistance Rc between individual CNT. Conversely, non-functionalized MWCNTs exhibit a typical 3D percolation threshold at ca. 4 wt %.
AB - The effect of the type of CNT (functionalized and non-functionalized) on the dielectric relaxation phenomena and conductivity of MWCNT/chitosan (MWCNT/CS) was investigated. Composites were prepared by the solvent cast method by homogeneously dispersing CNT into a CS matrix. FTIR analysis suggests the formation of hydrogen bonding in functionalized-MWCNT/CS whereas the CS remains unaffected in non-functionalized films. In the low conductivity region, the α-relaxation process associated with a glass transition in CS is affected by the MWCNT; the Vogel temperature increases due to a decrease of the water content. The σ-relaxation exhibits a typical Arrhenius-type temperature dependence that is independent on the moisture content. Strong interfacial interactions of functionalized-MWCNT with the CS matrix are responsible for high values of the contact resistance Rc between individual CNT. Conversely, non-functionalized MWCNTs exhibit a typical 3D percolation threshold at ca. 4 wt %.
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U2 - 10.1016/j.matchemphys.2015.02.041
DO - 10.1016/j.matchemphys.2015.02.041
M3 - Article
AN - SCOPUS:84924626391
SN - 0254-0584
VL - 155
SP - 252
EP - 261
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
ER -