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Single-walled Carbon nanotubes as a Microwave absorbing Material

Updated: Apr 25, 2022

Microwave absorbing material (MAM) are the type of material which absorbs the electromagnetic waves and converts them into thermal energy

1. The MAM is used in military applications also used in EMI reduction, radio detection, antenna pattern shaping, microwave technology and radar cross reduction, etc.,

2 Nanomaterials showcase a high potential in MAM due to their lightweight, ability to absorb the broadband spectrum. Carbon nanotubes (CNT) are one of the important MAM. They offer high strength and toughness when it’s used in composites.

3 The studies have showcased that the single-walled carbon nanotubes (SWCNT) can be used as the MAM due to their small diameter which offers a high aspect ratio compared to the multi-walled carbon nanotubes. SWCNT based nanocomposites showcased good microwave absorbing properties. The increase of SWCNT content increased the microwave absorbing property. The study shows that by adjusting the nanotubes concentration the absorption peak can be easily tuned.

4. A group of researchers have investigated the microwave absorption property of HiPCO® SWCNT and the influence of catalyst particles used to produce it. They indicated that the microwave loss due to Fe particles is not around 2.45GHz. The microwave absorption enhancement has been showcased with unpurified HiPCO® SWCNT compared to pure SWCNT. So the microwave absorption property is partially affected by the Fe particles and does not play a dominant role

5. NoPo Nanotechnology offers a small diameter of 0.6 to 1 nm HiPCO® single-walled carbon nanotubes (SWCNT) and has incredibly good control over production. The process can be modified to control the amount of catalyst present in the material. The process can be tuned to achieve from 10% – to 50% of catalyst particles in the as-produced nanotubes.

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1. Zhao, X. et al. Excellent microwave absorption property of Graphene-coated Fe nanocomposites. Sci. Rep. 3, 3421 (2013).

2. EMI_MicroAbsorb_Cat.pdf.

3. Sun, X.-G., Gao, M., Li, C. & Wu, Y. Microwave Absorption Characteristics of Carbon Nanotubes. Carbon Nanotub. – Synth. Charact. Appl. (2011) doi:10.5772/16514.

4. Liu, Z. et al. Microwave Absorption of Single-Walled Carbon Nanotubes/Soluble Cross-Linked Polyurethane Composites. J. Phys. Chem. C 111, 13696–13700 (2007).

5. Zhihua, P., Jingcui, P., Yanfeng, P., Yangyu, O. & Yantao, N. Investigation of the microwave absorbing mechanisms of HiPco carbon nanotubes. Phys. E Low-Dimens. Syst. Nanostructures 40, 2400–2405 (2008).

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