Facile Synthesis of Sn/Reduced Graphene Oxide Composites With Tunable Dielectric Performance Toward Enhanced Microwave Absorption

Tian Tian Li,Xiao Tian,Bo Zhong,Xiao Xiao Huang,Long Xia,Guangwu Wen,Jianghao Dai,Tao Zhang

doi:10.3389/fmats.2020.00108

Abstract

Electromagnetic (EM) wave absorbing materials are strongly desired for the reason that EM pollution has become a serious problem with the rapid development of modern technology, which brings harm to the environment and human health. Herein, nanocomposites of Sn/reduced graphene oxide (Sn/rGO) as a novel type of EM absorbing materials were synthesized via a facile and efficient strategy. Nanoscale SnO2 microspheres were synthesized by sol-gel method, and the Sn/rGO composites were obtained after hydrothermal process with GO. Samples with different Sn content were fabricated (Sn:rGO = 30:1, 20:1, 10:1, mass ratio), and their EM wave absorption performance were analyzed. By changing the mass ratio of Sn and rGO, dielectric constant of the composites can be adjusted, and better impedance matching can be achieved. The unique capacitive structure and conductive network enable the material to have strong dielectric loss and excellent absorption performance. This research offers a new route for designing and fabricating high-frequency EM wave absorbing materials.

Highlights

It is clear that rGO has a broad weak characteristic peak at around 2θ = 22.3◦, which can be assigned to the (002) crystal planes (Quan et al, 2017a; Xu et al, 2018)
The characteristic peak of Sn can be found in A1, A2, and A3, located at 2θ = 30.644, 32.018, 43.871, 44.902, 55.330, 62.538, 64.576, 72.414, and 79.470 corresponding to the (200), (101), (220), (211), (301), (112), (321), (420), and (312) planes, respectively
There is a slight shift in the position of the diffraction peaks, indicating that Sn is successfully anchored onto the rGO sheet and forms some interactions (Wang Z.Q. et al, 2018)

Summary

Introduction

With the rapid development of technology, electromagnetic (EM) interference has become a serious problem (Cao et al, 2018; Jia et al, 2018; Wei et al, 2018b; Wu G. et al, 2018; Lu S. et al, 2019), which causes damage to the operation of electronic devices, and has a remarkable negative effect on human health (Liang et al, 2016, 2018; Oraizi et al, 2016; Smitha et al, 2016; Tian et al, 2017; Meng et al, 2018). A large number of researches and Composites With Tunable Dielectric Performance theories have been focused on designing dielectric materials with thin thickness, lightweight, wide absorption frequency range and strong absorption property (Liu et al, 2016; Liu P. et al, 2016; Song L. et al, 2017; Liu J. et al, 2018; Samadi et al, 2018; Wu F. et al, 2018; Xie et al, 2018; Liu et al, 2020) Dielectric materials, such as carbon fibers (Shah et al, 2015), carbon coils (Hu et al, 2018), carbon nanotubes (Makarova et al, 2016), carbon black (Al-Ghamdi et al, 2016), are mainly carbon materials due to low density, high dielectric loss and adjustable surface properties (Guan et al, 2017; Xu et al, 2017; Wang S.S. et al, 2018; Wei et al, 2018a; Zhang L. et al, 2018; Wu et al, 2019), and a lot of researches have been conducted on them. Carbon materials have good absorbing performance, light weight and wide effective frequency band at low frequency, they cannot meet the application requirement in harsh thermal environment

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Conclusion