Issue 12, 2014
From the journal:

Journal of Materials Chemistry A

MnO2 decorated graphene nanoribbons with superior permittivity and excellent microwave shielding properties†

Tejendra K. Gupta,a   Bhanu P. Singh,*a   Vidya Nand Singh,b   Satish Teotia,a   Avanish Pratap Singh,c   Indu Elizabeth,a   Sanjay R. Dhakate,a   S. K. Dhawanc  and  R. B. Mathura  

* Corresponding authors

a Physics and Engineering of Carbon, Division of Materials Physics and Engineering, CSIR-National Physical Laboratory, New Delhi, India
E-mail: bps@mail.nplindia.org
Fax: +91-11-45609310
Tel: +91-11-45608460

b Electron and Ion Microscopy Section, CSIR-National Physical Laboratory, New Delhi, India

c Polymeric and Soft Materials Section, CSIR-National Physical Laboratory, New Delhi, India

Abstract

Microwave shielding properties of chemically synthesized MnO2 decorated graphene nanoribbons (GNRs) are reported for the first time. The nature of MnO2 decoration on the GNRs has been investigated using scanning electron microscopy, X-ray diffraction, Raman spectroscopy and high resolution transmission electron microscopy. The electromagnetic interference (EMI) shielding effectiveness of this material was investigated in the microwave region (Ku-band, 12.4–18 GHz). The presence of MnO2 on GNR enhances the interfacial polarization, multiple scattering, natural resonances and the effective anisotropy energy, which leads to absorption dominated high shielding effectiveness of −57 dB (blocking >99.9999% radiation) by a 3 mm thick sample. Dielectric attributes (ε′ and ε′′) were evaluated to understand the mechanism of the excellent shielding effectiveness. The material will be an excellent choice for radar absorbing applications.

Graphical abstract: MnO2 decorated graphene nanoribbons with superior permittivity and excellent microwave shielding properties

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Article information

DOI
https://doi.org/10.1039/C3TA14854H
Article type
Paper
Submitted
23 Nov 2013
Accepted
19 Dec 2013
First published
20 Dec 2013

J. Mater. Chem. A, 2014,2, 4256-4263

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MnO2 decorated graphene nanoribbons with superior permittivity and excellent microwave shielding properties

T. K. Gupta, B. P. Singh, V. N. Singh, S. Teotia, A. P. Singh, I. Elizabeth, S. R. Dhakate, S. K. Dhawan and R. B. Mathur, J. Mater. Chem. A, 2014, 2, 4256 DOI: 10.1039/C3TA14854H

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