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

Abstract

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.

Designing New Material Based on Functionalized Multi-Walled Carbon Nanotubes and Cu(OH)2–Cu2O/Polypyrrole Catalyst for Ethanol Oxidation in Alkaline Medium

“…The peaks at 666, 1018, and 2908 cm −1 corresponded to C-H vibration bands of the aromatic ring and C-H stretching vibration of PPy. The peaks observed at 1450 cm −1 , 3422 cm −1 , and 1504 cm −1 were attributed to C-N, N-H, and C C, respectively, confirming the effective polymerization of the polypyrrole film on the electrode (Brachetti-Sibaja et al, 2021;Rizi et al, 2021). The peak at 1365 cm −1 was attributed to the C-C(-N-Cu) stretching vibration indicating the deposition of copper hydroxide/ copper oxide on the surface of the PPy film (Guo et al, 2018;Peshoria and Narula, 2018).…”

Fabrication of PANI/MWCNT supercapacitors based on a chitosan binder and aqueous electrolyte for enhanced energy storage

“…49 The final decomposition stage is above 640°. 50 All stages are also seen in composite structures. In the end, the TGA curves of PANI/ MWCNT (5 : 1), PANI/MWCNT (10 : 1), and PANI/MWCNT (30 : 1) show increasing weight loss with the PANI content of 49.5%, 53.5%, and 57.2%, respectively, while the pristine PANI has a weight loss of 55.4%, which is lower than that of the PANI/MWCNT (30 : 1) sample.…”

Polyaniline Synthesized by Different Dopants for Fluorene Detection via Photoluminescence Spectroscopy

“…PANI is a singular conducting polymer compound with unique electrical and optical properties [ 10 ] and has the advantages of simple synthesis, environmental stability, affordability and flexible control of electrical features with charge-transfer doping and protonation [ 10 , 12 , 13 ]. Owing to its extraordinary properties, this compound can be used in various fields, such as electrochromic glasses [ 14 ], solar cells [ 15 ], electroluminescent machines [ 10 ], sensors [ 16 ], biosensors [ 17 ], supercapacitors [ 18 ], neural prosthesis/biotic–abiotic interfaces [ 10 ], scaffolding [ 19 ], delivery systems [ 20 ], anti-corrosion materials [ 21 ], membrane gas separation [ 8 ] and solar cells [ 22 ].…”