Ni(NO3)2浓度对Ni/还原氧化石墨微观结构及微波吸收性能的影响

doi:10.15541/jim20160046

摘要/Abstract

摘要：

以Ni(NO₃)₂为Ni源, 利用液相浸渍法在氧化石墨层间吸附Ni²⁺, 通过H₂热还原制备出Ni/还原氧化石墨纳米复合材料。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)及网络矢量分析仪等对样品的结构及性能进行分析和表征, 研究了Ni(NO₃)₂浓度对材料微观形貌及电磁性能的影响。结果表明, 所制备材料为纳米级Ni颗粒与RGO的复合体, 具有优良的微波吸收性能; 当Ni(NO₃)₂浓度为1.5 mol/L时, 材料电磁吸收性能最佳, 在2~18 GHz频率范围内, 材料厚度为2 mm时, 反射损耗(RL)小于-5 dB的频率范围可达9 GHz, RL_max可达-40 dB。

关键词: Ni, 氧化石墨, 纳米复合材料, 微波吸收

Abstract:

A technique for obtaining reduced graphite oxide (RGO) with Ni nanoparticle dispersed on the surface via chemical vapor deposition (CVD) method was reported. XRD and SEM observations were carried out to confirm the microstructure of Ni/RGO composite. Magnetic property of Ni/RGO was characterized by vector network analyzer. The influence of Ni(NO₃)₂ concentration on micromorphology and microwave absorbing property were also discussed. As the concentration of Ni(NO₃)₂ is 1.5 mol/L, the range of the reflection loss (RL) less than -5 dB is 9 GHz, of which the max value reaches -40 dB.

Key words: nickel, graphite oxide, nanocomposite material, microwave absorbing

中图分类号:

TB333

祝海, 杨丽, 刘洪波, 陈惠, 夏笑虹. Ni(NO₃)₂浓度对Ni/还原氧化石墨微观结构及微波吸收性能的影响[J]. 无机材料学报, 2016, 31(11): 1223-1229.

ZHU Hai, YANG Li, LIU Hong-Bo, CHEN Hui, XIA Xiao-Hong. Effect of Nickel Nitrate Concentration on Microstructure and Microwave Absorbing Property of Ni/RGO Nanocomposite Material[J]. Journal of Inorganic Materials, 2016, 31(11): 1223-1229.

图/表 7

图1 Ni/RGO-0.5(a)、Ni/RGO-1.0(b) Ni/RGO-1.5(c)与Ni/RGO-2.0 (d)样品的SEM照片及EDS图谱

Fig. 1 SEM images of Ni/RGO-0.5 (a), Ni/RGO-1.0 (b), Ni/RGO-1.5 with EDS pattern in inset (c), and Ni/RGO-2.0 (d)

图2 Ni/RGO-0.5、Ni/RGO-1.0、Ni/RGO-1.5与Ni/RGO-2.0样品的XRD图谱

Fig. 2 XRD patterns of Ni/RGO-0.5, Ni/RGO-1.0, Ni/RGO-1.5, and Ni/RGO-2.0

图3 原始氧化石墨和Ni/RGO-1.0样品的红外光谱图谱

Fig. 3 FTIR spectra of GO and Ni/RGO-1.0

图4 Ni/RGO-0.5、Ni/RGO-1.0、Ni/RGO-1.5和Ni/RGO-2.0样品的电磁参数图谱

Fig. 4 Electromagnetic parameters of Ni/RGO-0.5, Ni/RGO-1.0, Ni/RGO-1.5, and Ni/RGO-2.0

图5 Ni/RGO-0.5(a)、Ni/RGO-1.0(b)、Ni/RGO-1.5(c)和Ni/RGO-2.0(d)样品的tanδε和tanδμ图谱

Fig. 5 tanδε and tanδμ of Ni/RGO-0.5 (a), Ni/RGO-1.0 (b), Ni/RGO-1.5 (c), and Ni/RGO-2.0 (d)

图6 Ni/RGO-0.5(a)、Ni/RGO-1.0(b)、Ni/RGO-1.5(c)和Ni/RGO-2.0(d)样品的理论反射损耗曲线

Fig. 6 Theoretical reflection losses of Ni/RGO-0.5 (a), Ni/RGO-1.0 (b) , Ni/RGO-1.5 (c), and Ni/RGO-2.0 (d)

表1 Ni/RGO-0.5、Ni/RGO-1.0、Ni/RGO-1.5和Ni/RGO-2.0样品的微波吸收性能比较

Table 1 Electromagnetic property of Ni/RGO-0.5, Ni/RGO-1.0, Ni/RGO-1.5, and Ni/RGO-2.0

Sample	Ni/RGO-0.5
Material thickness /mm	1.50	2.0	1.5	2.0	1.5	2.0	1.5	2.0
Absorbing scale lower than -5 dB/GHz	11.5-18.0	8.5-13.2	12.4-18.0	9.0-15.4	13-18	9-18	13-18	9.5-18.0
Absorbing width lower than -5 dB/GHz	6.5	5.3	5.6	6.4	5.0	9.0	5.0	8.5
Max value of RL/dB	-18.5	-17.0	-23.0	-18.0	-44.0	-40.0	-28.8	-25.9
Matching frequence for RL_max /GHz	14.0	10.5	15.5	11.2	17.0	12.2	17.8	12.6

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Ni(NO₃)₂浓度对Ni/还原氧化石墨微观结构及微波吸收性能的影响

Effect of Nickel Nitrate Concentration on Microstructure and Microwave Absorbing Property of Ni/RGO Nanocomposite Material

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