Journal of Radiation Research and Radiation Proces ›› 2016, Vol. 34 ›› Issue (4): 40301-040301.doi: 10.11889/j.1000-3436.2016.rrj.34.040301

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Low temperature plasma graft polymerization of acrylic acid on polytetrafluoroethylene film for Pd-free electroless copper deposition

HE Xinzhong1,2, LI Rong1, GAO Qianhong1,2, WU Guozhong1,3   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China
  • Received:2016-04-19 Revised:2016-05-13 Online:2016-08-20 Published:2016-06-20
  • Supported by:

    Supported by the National Natural Science Foundation of China (11275252)

Abstract:

Acrylic acid (AAc) was grafted onto the surface of polytetrafluoroethylene (PTFE) film by low temperature plasma pretreatment. Subsequently, a thin copper layer was coated on the surface of the modified PTFE film (PTFE-g-PAAc) by palladium-free electroless copper deposition. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy showed that acrylic acid was successfully grafted onto the surface of the PTFE film. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) showed that a thin copper layer was uniformly deposited on the surface of the PTFE film. 3M taping method assessment according to ASTM D3359 indicated that the copper layer was tightly bonded on the film so that 3M tape could not tear down the copper layer from the surface of PTFE film. Electrical performance showed that the surface resistance (Rs) and resistivity of PTFE-g-PAAc-Cu decreased to 1.27×10-2Ω/sq and 50.1 μΩ·cm, respectively. The conductivity was improved from an insulator to a conductor (1~103 μΩ·cm), which could be potentially used as the flexible copper clad.

Key words: Polytetrafluoroethylene film, Low temperature plasma, Grafting modification, Acrylic acid, Electroless copper depo-sition

CLC Number: 

  • TL13