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激光诱导石墨烯的纳米银颗粒原位修饰及其导电性能调控

王文波 宋彦平 李年 王振洋

王文波, 宋彦平, 李年, 等. 激光诱导石墨烯的纳米银颗粒原位修饰及其导电性能调控[J]. 复合材料学报, 2023, 42(0): 1-10.
引用本文: 王文波, 宋彦平, 李年, 等. 激光诱导石墨烯的纳米银颗粒原位修饰及其导电性能调控[J]. 复合材料学报, 2023, 42(0): 1-10.
WANG Wenbo, SONG Yanping, LI Nian, et al. In-situ modification of laser-induced graphene with silver nanoparticles and its electronic conductivity modulation[J]. Acta Materiae Compositae Sinica.
Citation: WANG Wenbo, SONG Yanping, LI Nian, et al. In-situ modification of laser-induced graphene with silver nanoparticles and its electronic conductivity modulation[J]. Acta Materiae Compositae Sinica.

激光诱导石墨烯的纳米银颗粒原位修饰及其导电性能调控

基金项目: 安徽省科技重大专项 (202103a05020013)
详细信息
    通讯作者:

    宋彦平,硕士,在读博士,研究方向为功能石墨烯复合材料 E-mail: 18381307506@163.com

    王振洋,博士,研究员,博士生导师,研究方向为功能石墨烯复合材料 E-mail: zywang@iim.ac.cn

  • 中图分类号: TB332

In-situ modification of laser-induced graphene with silver nanoparticles and its electronic conductivity modulation

Funds: the Major Scientic and Technological Special Project of Anhui Province (202103a05020013)
  • 摘要: 随着高频通信技术的快速发展,由电磁波造成的电磁干扰问题日益严重,亟需开发针对5G频段的电磁屏蔽材料。以两次激光诱导法直接在固体材料上快速制备了银纳米颗粒/多孔石墨烯柔性复合薄膜:首次激光制备的亲水性激光诱导石墨(LIG)能够高效吸附AgNO3溶液,二次激光照射实现了银纳米粒子在多孔石墨烯上的原位生成和均匀负载。进一步研究了不同AgNO3浓度对所制得Ag/LIG材料的微观形貌、结构性质和导电特性的影响。结果表明,当AgNO3浓度为0.5 mol/L时,复合薄膜中银纳米颗粒保持小尺寸的同时分散性最好,其展现出2788 S/m的高电导率;同时,材料屏蔽效能从LIG的18-26 dB增加到复合材料的36-40 dB。在26 GHz频段处,Ag/LIG的屏蔽效能达到38 dB,经200次弯曲循环后效能保有率在90%以上。

     

  • 图  1  (a) Ag/激光诱导石墨(LIG)薄膜制备过程;(b) Ag/LIG复合材料的微观结构和电磁屏蔽机制示意图

    Figure  1.  (a) The preparation process of Ag/ laser-induced graphene (LIG) film; (b) Schematic diagram of microstructure and EMI shielding mechanism of Ag/LIG composite.

    图  2  不同激光聚焦条件下获得LIG的SEM图:(a、b)激光聚焦在样品表面;(c、d)激光虚焦;图c中的插图为截面SEM图

    Figure  2.  SEM images of LIG obtained at different laser focusing conditions: (a, b) Laser focusing on the surface of the sample; (c, d) Laser defocusing;The inset in Fig.2 C is a cross-sectional view.

    图  3  不同激光聚焦条件下获得LIG的接触角:(a)激光聚焦(b)激光虚焦

    Figure  3.  Water contact angles of LIG obtained at different laser conditions: (a) Laser focusing; (b) Laser defocusing

    图  4  不同浓度AgNO3溶液滴加后经激光还原的SEM图:(a、d) 0.2 mol/L;(b、e) 0.2 mol/L;(c、f) 0.8 mol/L

    Figure  4.  SEM images of Ag/LIG with different AgNO3 concentration after laser reduction: (a, d) 0.2 mol/L; (b, e) 0.2 mol/L; (c, f) 0.8 mol/L

    图  5  (a、b)不同LIG、Ag/LIG样品的Raman图谱;(c)不同样品拉曼图谱的D峰与G峰强度比(ID/IG)、2D峰与G峰强度比(I2D/IG)

    Figure  5.  (a, b) Raman spectra of LIG and Ag/LIG samples; (c) The intensity ratio of D peak to G peak (ID/IG) and 2D peak to G peak (I2D/IG) in Raman spectra of different samples.

    图  6  Ag/LIG的TEM形貌:(a)TEM图像;(b)HRTEM图像

    Figure  6.  TEM characterization of Ag/LIG: (a) TEM image; (b) HRTEM image

    图  7  LIG和Ag/LIG材料的XRD图谱

    Figure  7.  XRD patterns of LIG and Ag/LIG

    图  8  Ag/LIG-0.5的XPS表征结果:(a)总谱;(b、c) C 1s和Ag 3D的高分辨XPS图谱

    Figure  8.  XPS spectrum of Ag/LIG-0.5: (a) overview; (b, c) high-resolution XPS spectra of (b) C 1s and (c) Ag 3D

    图  9  LIG和Ag/LIG的面电阻和电导率(图b中插图为LIG和Ag/LIG-0.5的载流子相关测试结果)

    Figure  9.  Sheet resistance and electrical conductivity of LIG and Ag/LIG (The inset in (b) shows the carriers related characterization results for LIG and Ag/LIG-0.5)

    图  10  (a)不同AgNO3浓度制备的Ag/LIG复合材料及商用屏蔽膜的EMI SET;(b) LIG和Ag/LIG-0.5样品的SEA和SER对比;(c、d)不同AgNO3浓度制备的Ag/LIG复合材料在26 GHz频段的SET、SEA和SER(c)以及反射、吸收和透射系数(R、A和T)(d);(e)Ag/LIG-0.5复合薄膜在反复弯曲和超声处理后26 GHz处的屏蔽效能(f)二次激光照射前后LIG和Ag/LIG-0.5的实物图及薄膜的柔性展示(插图为Ag/LIG的水接触角)。

    Figure  10.  (a) EMI SET of Ag/LIG prepared with different AgNO3 concentrations and commercial film; (b) Comparison of SEA and SER of LIG and Ag/LIG-0.5 samples; (c, d) SET, SEA, and SER (c), R, A, and T coefficients (d) of Ag/LIG with different AgNO3 concentrations at the 26 GHz frequency band; (e) EMI SE of Ag/LIG-0.5 composite film at 26 GHz after bending or ultrasound; (f) The digital photograph of LIG and Ag/LIG-0.5 before and after secondary laser irradiation, as well as the flexibility of the film (The inset shows the water contact angle of Ag/LIG).

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出版历程
  • 收稿日期:  2023-10-11
  • 修回日期:  2023-12-05
  • 录用日期:  2023-12-12
  • 网络出版日期:  2024-01-02

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