New Method Fabricates Hybrid Carbon Aerogels with High Microwave Absorption

An article published in the journal Industrial & Engineering Chemistry Research proposes a new method for designing and producing extremely efficient magnetic porous hybrid carbon aerogels for microwave absorption (MA) applications.

New Method Fabricates Hybrid Carbon Aerogels with High Microwave Absorption

Study: Co Nanoparticles Encapsulated in Carbon Nanotubes Decorated Carbon Aerogels Toward Excellent Microwave Absorption. Image Credit: ioat/Shutterstock.com

Microwave Absorption Materials

Substantial efforts have been made over the last few decades to develop cost-effective procedures for synthesizing improved microwave absorption lightweight components with broad absorption and excellent absorbing power.

Carbon aerogels are widely known for their advantageous material properties, for instance, higher specific area of contact, significant porosity and moderate density. In particular, incorporating three-dimensional (3D) carbon aerogels with magnetic metals can boost synergistic effects between the separate components, allowing hybrid carbon aerogels to meet MA criteria.

As a result, they have been widely used in various fields, such as electronic safety, human healthcare equipment, and the defense-stealth business.

The use of nanoparticles with magnetic properties to decorate graphene is considered a promising strategy to attain impedance matching and in obtaining strengthened MA characteristics. Furthermore, nanostructures made of porous aerogels can have a lot of internal free space, which increases the number of microwave reflections through the confined three-dimensional formation of cell walls.

As such, 3-D aerogels are considered an excellent fit for building components for microwave absorption. 

Heterogeneous Composition and Diverse Structure

On the contrary, combining heterogeneous materials into lucid carbonaceous structures as absorbers for microwaves provides high polarization and good magnetism, which is especially beneficial for conductivity and microwave exhaustion.

Metal organic frameworks (MOFs), which are structured by combining metal clusters/nodes with organic ligands, are receiving a lot of interest because of their heterogeneous composition and structure.

Complex specimens generated from MOFs have proved to be of use in the areas of microwave absorption due to their anti-corrosion properties, low density, large surface areas, programmable nanostructures and regulated porosity.

More specifically, the transformation of such ligands in the MOF stages can result in the production of on-site structuring of carbon species containing metal nanoparticles (NPs) with magnetic characteristics. Co nanoparticles covered with carbon shells have been explored as microwave absorbers.

To date, achieving MOF derivatives having both a significant level of visualization as well as strong metal NP dispensability for electromagnetic (EM) wave diminishing has been a difficult task.

Synthesizing metal NPs contained in carbon nanotubes (CNTs) generated from pyrolysis of MOFs under reductive environments has been proposed as a viable solution to the problem.

This prevents metal nanoparticles from agglomerating and restacking at higher temperatures. In addition to this, it also changes their electronic formation to increase interfacial polarization and conductivity.

The developed multilayer interface comprises enriched flaws and a high specific area, which are successful techniques to maximize electromagnetic wave loss capacity, thanks to 3D aerogels with 1D CNTs implanted on their exterior.

Porous Hybrid Aerogel

This study discusses the fabrication of a porous hybrid aerogel made of N-doped carbon nanotubes embedded with cobalt on 3D-linked carbon nanosheets.

The blended carbon aerogel possesses a structure with significant pores allowing various dispersing, along with three-dimensional uninterrupted networks that allow for structured electronic conductivity. Such a tailored aerogel demonstrates good MA performance with effective absorption bandwidth at a particularly lower thickness, owing to shared effects between cobalt NPs and N-doped CNTs.

The optimized aerogel's filling ratio is particularly low, and its comparative reflection loss is better than that of different aerogels.

Important Findings

The hybrid carbon aerogel, CNS/Co@ NCNTs, was prepared via intermixing, directional freezing, carbonization, and freeze-drying. This study aimed to demonstrate how to make three-dimensional hybrid carbon aerogels featuring cobalt nanoparticles enclosed in N-doped CNTs synthesized on carbon nanosheets.

Researchers found that the hybrid carbon aerogel exhibits superior MA performance. The study offers new insights into the fabrication of materials suitable for microwave absorption using structural engineering, which is important for enhanced sensors, energy storage, and wearable electronic equipment.

Continue reading: Quantum Microwaves for Communication and Sensing

Reference

Fei, Y., Wang, X., Yuan, M., Liang, M., Chen, Y., & Zou, H. (2022). Carbon Aerogels Decorated With Co Nanoparticles Encapsulated in Carbon Nanotubes For Excellent Microwave Absorption. Industrial & Engineering Chemistry Research. Available at: https://pubs.acs.org/doi/10.1021/acs.iecr.1c03585

Disclaimer: The views expressed here are those of the author expressed in their private capacity and do not necessarily represent the views of AZoM.com Limited T/A AZoNetwork the owner and operator of this website. This disclaimer forms part of the Terms and conditions of use of this website.

Shaheer Rehan

Written by

Shaheer Rehan

Shaheer is a graduate of Aerospace Engineering from the Institute of Space Technology, Islamabad. He has carried out research on a wide range of subjects including Aerospace Instruments and Sensors, Computational Dynamics, Aerospace Structures and Materials, Optimization Techniques, Robotics, and Clean Energy. He has been working as a freelance consultant in Aerospace Engineering for the past year. Technical Writing has always been a strong suit of Shaheer's. He has excelled at whatever he has attempted, from winning accolades on the international stage in match competitions to winning local writing competitions. Shaheer loves cars. From following Formula 1 and reading up on automotive journalism to racing in go-karts himself, his life revolves around cars. He is passionate about his sports and makes sure to always spare time for them. Squash, football, cricket, tennis, and racing are the hobbies he loves to spend his time in.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Rehan, Shaheer. (2022, January 24). New Method Fabricates Hybrid Carbon Aerogels with High Microwave Absorption. AZoNano. Retrieved on December 01, 2024 from https://www.azonano.com/news.aspx?newsID=38570.

  • MLA

    Rehan, Shaheer. "New Method Fabricates Hybrid Carbon Aerogels with High Microwave Absorption". AZoNano. 01 December 2024. <https://www.azonano.com/news.aspx?newsID=38570>.

  • Chicago

    Rehan, Shaheer. "New Method Fabricates Hybrid Carbon Aerogels with High Microwave Absorption". AZoNano. https://www.azonano.com/news.aspx?newsID=38570. (accessed December 01, 2024).

  • Harvard

    Rehan, Shaheer. 2022. New Method Fabricates Hybrid Carbon Aerogels with High Microwave Absorption. AZoNano, viewed 01 December 2024, https://www.azonano.com/news.aspx?newsID=38570.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.