Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability

doi:10.1016/j.jmst.2020.04.007

Abstract

Abstract:

Electromagnetic interference (EMI) shielding at Terahertz (THz) frequency range attracts increasing attention due to the rapid development of THz science and technologies. EMI shielding materials with small thickness, high shielding effectiveness (SE), good flexibility and stability are highly desirable. Herein, an ultrathin flexible copper/graphene (Cu/Gr) nanolayered composite are prepared, which can reach the average EMI SE of 60.95 dB at 0.1-1.0 THz with a thickness of only 160 nm, indicating that more than 99.9999% of the THz wave power can be shielded. Furthermore, the Cu/Gr nanolayered composite also exhibits excellent oxidation resistance, with a 93.09% maintenance rate for EMI SE value after heating at 120 °C for 3 h in air, far higher than that of the bare Cu film (62.15%). Besides, the Cu/Gr nanolayered composite exhibits good mechanical flexibility and flexural fatigue resistance. The EMI SE value of the Cu/Gr nanolayered composite shows a maintenance rate of 98.87% even after 1500 times bending cycles, obviously higher than that of multilayer Cu film (93.07%). These results demonstrate that the ultrathin flexible Cu/Gr nanolayered composites with excellent shielding performance and good stability have a broad application prospect in THz shielding for wearable devices and next generation mobile communication equipment.

Key words: Terahertz shielding, Ultrathin flexible Cu/grapheme nano composites, High stability

Shengyue Hou, Wenle Ma, Guanghao Li, Yi Zhang, Yunyun Ji, Fei Fan, Yi Huang. Excellent Terahertz shielding performance of ultrathin flexible Cu/graphene nanolayered composites with high stability[J]. J. Mater. Sci. Technol., 2020, 52: 136-144.

Figures/Tables 6

Fig. 1. Schematic of the fabrication process of Cu/Gr nanolayered composites.

Fig. 2. Cross-sectional SEM images of (a, c) 4Cu4Gr sample with layered structure and (b) 4Cu sample without clear layered interface. Top-view SEM images of (d) the areaof the Cu layer covered by the graphene layer completely and (e, f) the area of the Cu layer covered with the graphene layer partially. The boundary of the graphene layertransferred onto the Cu layer was marked with a white dotted line.

Fig. 3. Raman spectra of (a) Cu foil after the growth of graphene and (b) Cu/Gr nanolayered composites with different layer numbers (Cu background subtracted for all spectra), (c) XRD pattern of the 4Cu4Gr sample and (d) photographs of the 4Cu4Gr sample bended by a tweezer and released naturally.

Fig. 4. (a) Schematic diagram of the terahertz time-domain spectroscopy system used for terahertz shielding measurements, (b) sheet resistance and conductivity of Cu/Gr nanolayered composites with different layer numbers, (c) EMI SE curves of Cu/Gr nanolayered composites with different layer numbers at 0.1-1.0 THz and (d) comparison of EMI SE versus thickness among previous reports and this work.

Fig. 5. (a) Cu 2p spectra and (b) Cu LMM spectra of the 1Cu1Gr and 1Cu samples before and after heating. EDS analysis results of (c) the 1Cu1Gr sample and (d) the 1Cu sample before and after heating. EMI SE curves of (e) the Gr/Cu/Gr sample and (f) the Cu film at 0.1-1.0 THz before and after heating. The heating process was conducted at 120 °C for 3 h in air.

Fig. 6. (a) Photographs of the recurrent bending cycles process and (b) EMI SE curves of the 4Cu4Gr and 4Cu samples at 0.1-1.0 THz before and after 1500 bending cycles.

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