CN-121985523-A - Cobalt-containing heterogeneous composite material and preparation method and application thereof

CN121985523ACN 121985523 ACN121985523 ACN 121985523ACN-121985523-A

Abstract

The invention discloses a cobalt-containing heterogeneous composite material, a preparation method and application thereof, wherein the cobalt-containing heterogeneous composite material is composed of at least two nanoparticles of Co, coO and CoN, heterogeneous interfaces are formed among the Co, coO and CoN nanoparticles, the defects of the prior art are overcome, a nonlinear gradient barrier heterostructure of Co/CoO, co/CoN and CoO/CoN is constructed through adjusting the concentration ratio of metal ions and high electronegativity atoms in a gradient thermal field reaction system, and the contribution of different polarizations and conductivities to the electromagnetic performance of the composite material is separated by utilizing the unique charge behaviors of different contact interfaces, so that the electromagnetic wave absorption performance of the heterostructure in the composite material is optimized.

Inventors

GAO SHENGTAO
WU HONGJING
LI ZIJING
ZHANG YUANCHUN

Assignees

安徽理工大学
江苏波纳电子科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (8)

1. A cobalt-containing heterogeneous composite material, characterized by being composed of at least two nanoparticles of Co, coO and CoN, and forming a heterogeneous interface between the Co, coO and CoN nanoparticles.
2. The method for preparing the cobalt-containing heterogeneous composite material according to claim 1 is characterized in that cobalt source and urea powder are mixed according to different proportions, the mixed powder is ground and uniformly mixed in air, then the mixture is dried to obtain a reaction raw material, the reaction raw material is heated to 800-900 ℃ in a nitrogen atmosphere, and the temperature is kept for 2-3 h, and the cobalt-containing heterogeneous composite material is obtained after cooling.
3. The method for preparing a heterogeneous composite material containing cobalt according to claim 2, wherein the drying temperature is 60 ℃ to 80 ℃ and the drying time is not less than 6 hours.
4. The method of preparing a heterogeneous composite material containing cobalt according to claim 2, wherein the cobalt source is cobalt chloride.
5. A method for the preparation of a cobalt-containing heterogeneous composite according to claim 2 or 3, characterized in that the ratio of the amounts of substances of the cobalt source and urea is 1:0.5-3.5.
6. A method of preparing a cobalt-containing heterogeneous composite according to claim 2 or 3, wherein the ratio of the amounts of the substances of the cobalt source and urea is 1:0.5-1.4.
7. A method for the preparation of a cobalt-containing heterogeneous composite according to claim 2 or 3, characterized in that the ratio of the amounts of substances of the cobalt source and urea is 1:1.8-3.5.
8. The cobalt-containing heterogeneous composite according to claim 1, characterized by its application in the field of electromagnetic wave absorption.

Description

Cobalt-containing heterogeneous composite material and preparation method and application thereof Technical Field The invention relates to the technical field of preparation of electromagnetic wave composite materials, and in particular relates to a cobalt-containing heterogeneous composite material, and a preparation method and application thereof. Background The development of wireless communication technology and intelligent technology makes the electromagnetic radiation flux exceed 10 18 times in natural state, and in order to cope with the increasing electromagnetic radiation and the increasingly complex electromagnetic environment, the electromagnetic wave absorbing material (EWM) is faced with the technical innovation of broadband and accurate design. However, current EWM designs often employ empirical combinatorial designs and adjust the electromagnetic properties of the material through trial-and-error experiments. Theoretically, the electromagnetic performance of EWM is mainly due to interaction of microscopic factors such as internal dipoles, interface charges, and carriers with electromagnetic waves. However, due to the difference in dipole relaxation behavior, the difference in interface barrier height and the difference in carrier transport state lead to intricate EWM dielectric polarization behavior, and it is difficult to effectively divide contributions of different polarization behaviors through artificial experiments. Therefore, a set of generalized micro-macro physical model cannot be formed to guide the directional and broad-band design of the EWM. The dilemma requires that a proper basic physical unit is selected, the motion behavior is used as a reference and mapped to different dielectric behaviors through a special function tool, and then a statistical model is used for inverting macroscopic performance parameters from bottom to top, so that a semi-quantitative model which relates microscopic factors to macroscopic characteristics is constructed. Disclosure of Invention The invention aims to provide a nonlinear heterogeneous contact material with multiple charge transmission modes based on cobalt-based nitride and oxide, which utilizes the extremely wide energy band range of a Co system and the weak lattice anisotropy of the cobalt-based nitride and oxide, so that the electron aggregation state can be influenced and the carrier transmission efficiency can be controlled through the difference (delta Wf) of the work function of a crystal face between phases and the difference (delta E) of the band gap between the crystal faces, and the defects in the prior art are overcome. In order to solve the problems, the technical scheme adopted by the invention is as follows: a heterogeneous composite material containing cobalt is composed of at least two nanoparticles of Co, coO and CoN, and a heterogeneous interface is formed between the Co, coO and CoN nanoparticles. The preparation method of the cobalt-containing heterogeneous composite material comprises the steps of mixing a cobalt source and urea powder according to different proportions, grinding and uniformly mixing the mixed powder in air, then drying to obtain a reaction raw material, heating the reaction raw material to 800-900 ℃ in a nitrogen atmosphere, preserving heat for 2-3h, and cooling to obtain the cobalt-containing heterogeneous composite material. Wherein the drying temperature is 60-80 ℃ and the drying time is not less than 6 hours. Wherein the cobalt source is cobalt chloride. Wherein the ratio of the amounts of substances of the cobalt source and urea is 1:0.5-3.5. Wherein the ratio of the amounts of substances of the cobalt source and urea is 1:0.5-1.4. Wherein the ratio of the amounts of substances of the cobalt source and urea is 1:0.6. Wherein the ratio of the amounts of substances of the cobalt source and urea is 3:4. Wherein the ratio of the amounts of substances of the cobalt source and urea is 1:1.8-3.5. Wherein the ratio of the amounts of substances of the cobalt source and urea is 1:3. Finally, the cobalt-containing heterogeneous composite material is applied to the field of electromagnetic wave absorption. Compared with the prior art, the invention has the following implementation effects: 1) The invention constructs a nonlinear gradient barrier heterostructure of Co/CoO, co/CoN and CoO/CoN by regulating the concentration ratio of metal ions and high electronegativity atoms in a gradient thermal field reaction system by regulating the type and phase structure of a contact interface and utilizing the difference of charge occupation states on the orbit splitting energy level of Co 2+/Co3+; 2) The carrier behavior at the interface is obviously limited by the potential barrier due to the difference of crystal face work functions of the Co system, the high work function area shows a weaker dipole layer due to the uniform distribution of electron clouds, electrons are in a tight state and are difficult to escape, th