Fabrication of Highly Effective Polyaniline Grafted Carbon Nanotubes To Induce Active Protective Functioning in a Silane Coating

Abstract

Neat silane coatings only provide barrier protection for the substrate subjected to corrosive media; therefore, the inclusion of efficient corrosion inhibitor in silane coating is vital to achieving active protection at defect sites of coatings. Elucidating the role of polyaniline (PANI) as a modifier for functionalized carbon nanotubes (CNTs) in the silane matrix to achieve active protection is the aim of this study. Different methods such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman spectroscopy, zeta potential (ZP), and field emission scanning electron microscopy (FESEM) were employed to examine the structure of functionalized CNTs. FESEM images showed an increase in the diameter of nanotubes after modification proving the good grafting of PANI on the CNTs' surface, which was also confirmed by Raman, FTIR, and XRD measurements. Electrochemical impedance spectroscopy (EIS) was conducted on intact and scratched coatings. Results revealed a dual active-barrier effect of PANI grafted on CNTs in the silane coating protection.

Enhancing Seebeck coefficient and electrical conductivity of polyaniline/carbon nanotube–coated thermoelectric fabric

“…As shown in Figure 3, several spectrum peaks prove the existence of PANI/CNT on the fabric including 1096 cm À1 (C-O-C), 42 1451 cm À1 (C-H), 43 1558 cm À1 (C=C), 44 1722 cm À1 (C=O), 42 2893 cm À1 (C-H), 44 and 3171 cm À1 (O-H). 42 Figure 4 shows the FE-SEM images of the nanocomposite/fabrics. They maintained their outstanding flexibility; capable of being easily rolled, bent, twisted, and tailored into any preferred shape.…”

“…To examine the existence of nanocomposite on the fabric surface, attenuated total reflection (ATR) spectrum was used for the sample with the best power factor (PANI/10wt%CNT). As shown in Figure 3, several spectrum peaks prove the existence of PANI/CNT on the fabric including 1096 cm −1 (C-O-C), 42 1451 cm −1 (C-H), 43 1558 cm −1 (C=C), 44 1722 cm −1 (C=O), 42 2893 cm −1 (C-H), 44 and 3171 cm −1 (O-H). 42

Figure 3.Attenuated total reflection spectrum of fabric coated with PANI/10wt%CNT nanocomposite.

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“…As shown in Figure 3, several spectrum peaks prove the existence of PANI/CNT on the fabric including 1096 cm −1 (C-O-C), 42 1451 cm −1 (C-H), 43 1558 cm −1 (C=C), 44 1722 cm −1 (C=O), 42 2893 cm −1 (C-H), 44 and 3171 cm −1 (O-H). 42

Figure 3.Attenuated total reflection spectrum of fabric coated with PANI/10wt%CNT nanocomposite. Note: PANI: polyaniline; CNT: carbon nanotube.

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Synthesis and application properties ofpolyaniline‐amino‐carbonnanotube antistatic agents

“…The interaction between CNTs and polyaniline in PANI-A-CNT was as follows: (i) π-π stacking between the monomeric units of PANI and CNT; (ii) hydrogen bonds between PANI and the -NH 2 group of CNT; (iii) PANI and CNTs covalent bonds; and (iv) electrostatic attraction between the -NH + group of PANI and the -COO À group of O-CNT. 44 In addition, PANI's quinone and benzene structures could be found in the PANI-A-CNT sample, respectively, as evidenced by peaks at 1567 and 1474 cm À1 . Furthermore, the presence of PANI in its conductive state was confirmed by a peak at 1303 cm À1 associated with the C-N stretching of secondary aromatic amines.…”

“…According to research, the D-band and G-band were attributed to the presence of disorder or curvature in rolled graphene sheets of the CNT lattice (sp 3 form of carbon) and the inplane vibration of the all-carbon materials with sp 2 bonds, respectively. 44 Figure 3 showed the Raman spectra of p-CNT, OCNT, A-CNT, and PANI-A-CNT. All the samples' Raman spectra revealed two peaks at 1323 and 1574 cm À1 , corresponding to the D-band and G-band, respectively.…”