Assembling Exfoliated Layered Double Hydroxide (LDH) Nanosheet/Carbon Nanotube (CNT) Hybrids via Electrostatic Force and Fabricating Nylon Nanocomposites

Abstract

In this paper, Co-Al layered double hydroxide (LDH) and carbon nanotubes (CNT) have been assembled to form exfoliated LDH nanosheet/carbon nanotube hybrids via electrostatic force. The assembling process and nanostructures of exfoliated LDH/CNT hybrids were investigated by zeta potential, Raman spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD). The assembly mechanism of LDH with CNT was also discussed. Furthermore, the unique three-dimensional (3D) hybrids thus prepared were used as reinforcing nanofillers to enhance the performance of polyamide 6 (PA6). It was found that the synergic effect of the CNT and LDH nanoplatelets resulted in homogeneous dispersion of the hybrid nanofillers throughout the PA6 matrix and strong combination with the matrix, thus providing an efficient mechanical improvement for the PA6 nanocomposites.

Layered double hydroxide/carbon nanotubes composite as a high performance anode material for Ni–Zn secondary batteries

“…Recently, the assembly of CNT-based composites or hybrids with the desired nanoscale guests, as an emerging and quickly developing field, has been investigated for enhancing the properties of resulting versatile materials and achieving a broad range of practical applications [25][26][27][28]. Therefore, the hybridization of 1D nanotubes and 2D lamellar flakes leads to 3D composite materials, which are very promising and crucial, as they can enable versatile and tailormade properties with excellent performances far beyond those of the individual materials.…”

Simple fabrication of strongly coupled cobalt ferrite/carbon nanotube composite based on deoxygenation for improving lithium storage

“…Moreover, the MFe 2 O 4 (M = Ni, Co, and Mg) spinel ferrites could be constructed by calcination of tailored layered double hydroxides (LDHs) of the type ½M 2þ 1ÀxÀy Fe 2þ y Fe 3þ x ðOHÞ 2 xþ [A nÀ x=n Á mH 2 O] precursors, in which the molar ratio of M 2+ /(Fe 2+ + Fe 3+ ) was adjusted to the same value as single spinel ferrite [23]. LDHs could be exfoliated as positively charged nanosheets with a molecular thickness [24][25][26], which could be self-assembled onto negatively charged surface of oxidized CNTs by electrostatic interaction [27][28][29]. Furthermore, when an Fe 2+ -containing LDH precursor was employed to generate neat MFe 2 O 4 spinel ferrite, the transformation of Fe 2+ to Fe 3+ may occur causing the reduction of the oxygen-containing groups on the oxidized CNTs surface.…”

Dehydration-rehydration induced structural changes in pristine and composite layered double hydroxides

“…Nanocarbons and layered double hydroxides were intensly investigated recently because of their excellent properties [82,[85][86][87]. The combination of these one-and two-dimensional …”

“…These hierarchical nanostructures can serve as electrodes, sensors as well as electric circuit elements after appropriate modification, and have promising applications as electrocatalysts [89] or in hydrogen storage devices [90]. This kind of composite has mostly been prepared by in situ growth of CNTs on LDH [87,90], co-precipitation method [89] or wet mixing [86].…”

“…Huang et al [86] presented a simple method for preparing exfoliated CNT−LDH hybrids through mixing positively charged LDHs and negatively charged CNTs. They even proposed a model to describe the co-assembling process.…”