Template-Free Synthesis of ``Wool-Ball''-Like Hollow CuS Structures Can Effectively Suppress Electromagnetic Radiation: A Mechanistic Insight

Biswas, Sourav and Dutta, Suvanka and Panja, Sujit S and Bose, Suryasarathi (2019) Template-Free Synthesis of ``Wool-Ball''-Like Hollow CuS Structures Can Effectively Suppress Electromagnetic Radiation: A Mechanistic Insight. In: JOURNAL OF PHYSICAL CHEMISTRY C, 123 (28). pp. 17136-17147.

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Abstract

Lightweight and easy to fabricate and integrate microwave absorbers are in great demand both in commercial space as well as in stealth applications given the surge in the use of wireless communication. In the past decade, research on designing polymer nanocomposite based microwave absorbers containing magnetic and conducting nanoparticles has swollen significantly; however, a clear mechanistic insight on the usage of semiconductors is far away. Herein, the potential of ``wool-ball''-like hollow semiconductor (CuS, copper sulfide) structures is explored for microwave absorption, and a mechanistic insight is proposed based on the experimental evidence. The facile synthesis approach, unique morphological structure, and optical properties make this semiconductor (CuS) quite attractive for the proposed application. In addition, the systematic analysis reveals that this material has the potential to replace the conventional conducting or magnetic nanoparticles, due to its favorable skin depth and microwave attenuation capability through dielectric heating and polarization loss. Polyvinylidene fluoride (PVDF) composites containing hollow CuS structures exhibited shielding effectiveness of 44 dB at 18 GHz, of which 86% of the incident radiation was attenuated by absorption. Further, thermal dissipation ability of this composite and its correlation with real-time microwave exposure through time-temperature response have offered new avenues in the design of microwave absorbers.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY C
Publisher:	AMER CHEMICAL SOC
Additional Information:	Copyright of this article belongs to JOURNAL OF PHYSICAL CHEMISTRY C
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	13 Nov 2019 05:45
Last Modified:	13 Nov 2019 05:45
URI:	http://eprints.iisc.ac.in/id/eprint/63418

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