| β-MnO2纳米棒的电磁特性和多极化驰豫损耗(英文) |
| Electromagnetic Characteristics and Multiple Dielectric Relaxations of β-Manganese Dioxide Nanorods |
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| 摘要: 采用低温水热合成法，以(NH4)2S2O8作氧化剂，以MnSO4·H2O为锰源，在高压反应釜中加热120 ℃并保压48 h制备了β-MnO2纳米棒。利XRD，SEM，TEM和振动样品磁强计(VSM)对产物进行表征，并就产物的电磁特性和多极化损耗机制进行研究。结果表明，纳米粉体产物是直径为50～70 nm，长度约为几个微米并具有四方晶体结构的β-MnO2纳米棒，同时产物表现出超顺磁性特征。β-MnO2纳米棒具有优异的电磁波损耗特性，厚度为1 mm的试样其最大反射损耗在18 GHz能达到-8.1 dB，优于-5 dB的有效吸收带处于15.7～18 GHz宽频段内；2 mm厚的试样在9.8 GHz其反射损耗达到-25 dB，并且优于-5 dB的有效吸收带处于8～12.8 GHz。 |
| 关键词: 二氧化锰 纳米棒 介电损耗 磁性能 吸波性能 |
| 基金项目: |
| Abstract: β-MnO2 was prepared via a low-temperature hydrothermal method using manganese sulfate(MnSO4·H2O) and ammonium persulfate((NH4)2S2O8) as raw materials in stainless-steel autoclave at 120 ℃ and for 48 h. The products were characterized by XRD, SEM, TEM and vibrating sample magnetometer(VSM). The results show that the nano-structured materials were exactly β-manganese dioxides with tetragonal crystal structures and consisted of straight and smooth nanorods with diameters in the range of 50～70 nm and lengths up to several micrometers, and the β-MnO2 displays also superparamagnetism characteristics. The as-prepared β-MnO2 has excellent microwave absorption capability. The maximum reflection loss of the samples with 1 mm thickness reaches only -8.1 dB at 18 GHz and the effective absorption band under -5 dB is from 15.7 to 18 GHz. The 2 mm thickness sample shows the maximum reflection loss of -25 dB at 9.8 GHz and the absorption range below -5 dB from 8 to 12.8 GHz. |
| Keywords: manganese dioxide nanorods dielectric propeties magnetic properties microwave absorption |
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| 摘要点击次数: 1981 |
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| 段玉平,马 贺,张 佳,李晓钢,刘顺华.β-MnO2纳米棒的电磁特性和多极化驰豫损耗(英文)[J].无机化学学报,2009,25(9):1635-1641. |
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