Investigation of the pore-size dependent microwave absorption properties of honeycomb SnO 2
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Investigation of the pore-size dependent microwave absorption properties of honeycomb SnO2 Ruoming Wang1, Pengwei Bai1, Biao Zhao1,* Rui Zhang1,2,*
, Zhongyi Bai1, Xiaoqin Guo1, and
1
Henan Key Laboratory of Aeronautical Materials and Application Technology, School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450046, China 2 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
Received: 18 June 2020
ABSTRACT
Accepted: 4 September 2020
In this work, the honeycomb-like SnO2 with excellent microwave absorbing (MA) capability was successfully prepared by a template method. Furthermore, honeycomb-like SnO2 configuration with various pore sizes can be prepared by altering the size of polystyrene (PS) nano-sphere. The microstructure, crystallographic structure, elemental chemical state and MA properties of honeycomblike SnO2 were measured by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric-difffferential scanning calorimetry (TGDSC) and Vector network analyzer (VNA), respectively. Interestingly, the microwave absorption properties were determined by their honeycomb configurations. Furthermore, honeycomb SnO2 prepared using 148 nm PS spheres as template, presented a minimal RL of -47.4 dB at 11.1 GHz with the layer thickness of 3.2 mm. Meanwhile, the value of RL less than -10 dB was found in the range of 9.8–15.2 GHz. The combination of interfacial polarization, dielectric loss and cellular structure can inhibit the propagation of electromagnetic waves and dissipate microwave energy through heat or other forms. It is believed that the honeycomb-like structures could be expected to be candidates for a new generation of absorbing materials.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Electromagnetic (EM) waves make our life convenient and comfortable. However, it also produces EM pollution which brings negative role in industry and life [1–4]. Every year, the harms caused by EM pollution on the health of humans and other organisms are exponentially rising. It is named as the fourth
largest physical pollution in the world [5–8]. Therefore, it is urgent to explore high-efficiency and broadband EM wave absorbing materials. For EM absorbing materials, first of all, the impedance matching should be considered, which could make microwaves enter the interior of material as much as possible [9–12]. Second, high dissipation ability of microwave energy is needed. Generally, the
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https://doi.org/10.1007/s10854-020-04429-w
J Mater Sci: Mater Electron
dissipation ability consisted of dielectric loss and magnetic loss mechanism. The microwave energy would convert into heat or other forms energy to dissipate [13–16]. Moreover, the microstructure significantly affects EM absorbing properties. Currently, the hollow porous structure is preferred thanks to the weight decrease and adjustable impedance
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