Preparation and microwave absorbing property of silver-coated graphite nanosheet NanoG with Pyrrole |
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Authors: | Yongqing Yang Shuhua QiXinxin Zhang Yunchuan Qin |
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Affiliation: | Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072, PR China |
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Abstract: | Microwave absorbing material PPy/Ag/NanoG was prepared by in situ polymerization of Pyrrole on the surface of silver-coated conductive graphite nanosheet (Ag/NanoG). The morphologies and nanostructures of PPy, Ag/NanoG and PPy/Ag/NanoG were characterized by scanning electron microscope (SEM), energy dispersive spectroscopy analysis (EDS) and X-ray diffraction analysis (XRD) respectively. Results show that Ag/NanoG has layered structure with high aspect ratio (width-to-thickness) and most of Ag/NanoG nanoparticles are encapsulated by PPy. Measurement of electromagnetic parameters shows that the complex permittivity (ε* = ε′-jε″), complex permeability (μ* = μ′-jμ″), dielectric loss tanδe = ε″/ε′ and magnetic loss tanδm = μ″/μ′ of PPy/Ag/NanoG are superior to those of PPy. The reflection loss of PPy/Ag/NanoG is below −15 dB at the X band from 8.2 GHz to 12.4 GHz and the minimum loss value is − 18.21 dB at 9.86 GHz. |
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Keywords: | Nanocomposites Microstructure Dielectric loss Electromagnetic parameters Microwave absorbing properties |
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