Synthesis and Microwave Absorption Properties of Core‐Shell Structured Co₃O₄‐PANI Nanocomposites

Abstract

The core-shell structured Co3O4-PANI nanocomposites have been successfully prepared using an in situ polymerization method, while the core Co3O4 nanoparticles were synthesized by carbon-assisted method using degreasing cotton as a template. The obtained samples were characterized by XRD, TEM, FTIR, and XPS. The results indicated that the amorphous PANI was well covered on the surface of the spinel Co3O4 and the Co3O4-PANI with core-shell structure was formed with particle size of about 100 nm. The interfacial interaction of the core-shell nanocomposite greatly enhances the microwave absorption properties. The maximum reflection loss of Co3O4-PANI is up to −45.8 dB at 11.7 GHz with a thickness of 2.5 mm and the adsorption bandwidth with the reflection loss below −10 dB reaches 14.1 GHz ranging from 3.9 to 18 GHz when the thickness is between 2 and 5.5 mm. Therefore, the facilely synthesized and low-cost Co3O4-PANI nanocomposite with superior microwave absorption properties can be a promising nanomaterial for high efficient microwave absorption.

Effect of Pr, Sm, and Tb Doping on the Morphology, Crystallite Size, and N2O Decomposition Activity of Co3O4 Nanorods

“…Figure 2 shows the XRD patterns of the calcined cobalt oxalate and its RE-containing mixtures. XRD pattern for the undoped Co 3 O 4 catalyst (Figure 2(a)) reveals that the presence of reflections matches well with those of the cubic Co 3 O 4 spinel oxide (space group Fd3m; JCPDS card number 42-1467) [18,[20][21][22][23][24][25][26]. No other peaks assignable to Co 2 O 3 , CoO, and Co were detected indicating that the decomposition of cobalt oxalate in air proceeds with the formation of Co 3 O 4 spinel oxide as a pure phase.…”

Assessment of Melamine in Different Water Samples with ZnO‐doped Co3O4Nanoparticles on a Glassy Carbon Electrode by Differential Pulse Voltammetry

“…In addition, the crystalline phases of Co 3 O 4 as (004), (220), (311), (422), (440), and (533) are closely matched with JCPDS no. 0042–1467 and prior authors [34,35] . The crystallographic dimension of the synthesized ZnO‐doped Co 3 O 4 NPs can evaluate applying Scherrer Equation as in below. …”

Enabling methanol oxidation by an interacting hybrid nanosystem of spinel Co3O4 nanoparticle decorated MXenes

“…S2b †), the spinel structure can be confirmed by the absorption peaks at 563 and 661 cm −1 attributed to the OB 3 and ABO vibrations, respectively (with B representing Co 3+ in the octahedral site and A representing Co 2+ occupying the tetrahedral site). 46 The peak at 1383 cm −1 arises due to the stretching vibrations of NO 3 − ions 46 and the absorption at 1642 and 3465 cm −1 corresponds to the bending and stretching of H 2 O molecules adsorbed on the surface. In the nanocomposite TC (Fig.…”