Low cost 3D bio-carbon foams obtained from wheat straw with broadened bandwidth electromagnetic wave absorption performance

被引：89

作者：

Aslam, Muhammad Adnan ^{[1
,2
]}

Ding, Wei ^{[3
,4
]}

Rehman, Sajid Ur ^{[1
]}

Hassan, Ali ^{[1
,2
]}

Bian, Yuecheng ^{[1
,2
]}

Liu, Qiangchun ^{[5
]}

Sheng, Zhigao ^{[1
]}

机构：

[1] Chinese Acad Sci, Hefei Inst Phys Sci, High Magnet Field Lab, Anhui Prov Key Lab Condensed Matter Phys Extreme, Hefei 230031, Peoples R China

[2] Univ Sci & Technol China, Hefei 230026, Peoples R China

[3] Anhui Univ, Inst Phys Sci, Hefei 230601, Peoples R China

[4] Anhui Univ, Inst Informat Technol, Hefei 230601, Peoples R China

[5] Huaibei Normal Univ, Sch Phys & Elect Informat, Huaibei 235000, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2021年 / 543卷

基金：

中国国家自然科学基金;

关键词：

Microwave absorption; Broadband absorption; Lightweight; Low cost; Wheat straw; Agricultural waste; EFFICIENT MICROWAVE-ABSORPTION; POROUS CARBON; HOLLOW MICROSPHERES; HIGH PERMITTIVITY; COMPOSITES; BIOMASS; LIGHTWEIGHT; MORPHOLOGY; SHELL; NANOTUBES;

D O I：

10.1016/j.apsusc.2020.148785

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Bio-derived dielectrics have drawn extensive attention for microwave absorption and shielding because of renewability and environmental friendliness. In this work, foam-like bio-carbon has been obtained from wheat straw waste and its microwave absorption performance has been studied. By controlling the precursor ratio of KOH, the optimized morphology of bio-carbon has been realized. The 3D carbon foam obtained at 600 degrees C with KOH and biomass ratio 1:1 (AC-600 (1:1), presents decent microwave reflection loss. Especially, with a low absorber ratio (10 wt%), the effective absorption bandwidth (RL <-10 dB) can reach 8.8 GHz (7.2-16 GHz) at a matching thickness of 2.5 mm. 3D porous network, interface effect, defects in carbon network, and dipolar relaxation make a good contribution towards broadband and excellent reflection loss. The eco-friendly, lightweight, and low-cost bio-carbon foam has great application prospects of microwave absorption.

引用

页数：8

共 64 条

[1] Investigating the effects of metallic submicron and nanofilms on fiber-reinforced composites for lightning strike protection and EMI shielding [J].