CVD Conditions for MWCNTs Production and Their Effects on the Optical and Electrical Properties of PPy/MWCNTs, PANI/MWCNTs Nanocomposites by In Situ Electropolymerization

Polymers

Esther Ramírez-Meneses¹  HéctorJavier Dorantes-Rosales²  SilviaBeatriz Brachetti-Sibaja³  AidéMinerva Torres-Huerta³  MiguelAntonio Domínguez-Crespo³  AdelaEugenia Rodríguez-Salazar⁴  Diana Palma-Ramírez⁵ 

[1] Departamento de Ingeniería y Ciencias Químicas, Universidad Iberoamericana, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, México City 01219, Mexico;Departamento de Metalurgia, Instituto Politécnico Nacional, ESIQIE, México City 07300, Mexico;Instituto Politécnico Nacional, CICATA-Altamira, Carretera Tampico-Puerto Industrial, km 14.5, Altamira 89600, Mexico;Instituto Politécnico Nacional, CICATA-Querétaro, Cerro Blanco 141, Col. Colinas del Cimatario, Santiago de Querétaro City 76090, Mexico;Instituto Politécnico Nacional, CMPL, Av. Acueducto S/N, La Laguna Ticomán, México City 07340, Mexico;

关键词: chemical vapor deposition;    MWCNTs;    conducting polymers;    hybrid composites;    stability;    electrical properties;   

DOI  :  10.3390/polym13030351

来源: DOAJ

【 摘 要 】

In this work, the optimal conditions of synthesizing and purifying carbon nanotubes (CNTs) from ferrocene were selected at the first stage, where decomposition time, argon fluxes, precursor amounts, decomposition temperature (at 1023 K and 1123 K), and purification process (HNO₃ + H₂SO₄ or HCl + H₂O₂), were modulated through chemical vapor deposition (CVD) and compared to commercial CNTs. The processing temperature at 1123 K and the treatment with HCl + H₂O₂ were key parameters influencing the purity, crystallinity, stability, and optical/electrical properties of bamboo-like morphology CNTs. Selected multiwalled CNTs (MWCNTs), from 1 to 20 wt%, were electropolymerized through in-situ polarization with conductive polymers (CPs), poly(aniline) (PANI) and poly(pyrrole) (PPy), for obtaining composites. In terms of structural stability and electrical properties, MWCNTs obtained by CVD were found to be better than commercial ones for producing CPs composites. The CNTs addition in both polymeric matrixes was of 6.5 wt%. In both systems, crystallinity degree, related to the alignment of PC chains on MWCNTs surface, was improved. Electrical conductivity, in terms of the carrier density and mobility, was adequately enhanced with CVD CNTs, which were even better than the evaluated commercial CNTs. The findings of this study demonstrate that synergistic effects among the hydrogen bonds, stability, and conductivity are better in PANI/MWCNTs than in PPy/MWCNTs composites, which open a promissory route to prepare materials for different technological applications.

【 授权许可】

Unknown