Electroless copper plating and properties of superaligned carbon nanotube film
[Introduction]The electromagnetic shielding performance of superaligned carbon nanotube(SA-CNTs)film can be improved by plating with a uniformly distributed copper coating on its surface,laying the foundation for its application to flexible circuit boards,high-speed microprocessors,radar reflectors,and mobile communication devices.[Method]Firstly,the SA-CNTs film was degreased in alkaline solution.Secondly,a polydopamine layer was formed on SA-CNTs film by pre-activation with dopamine,not only providing more active sites for the subsequent activation in AgNO3 solution,but also facilitating the direct formation of silver nanoparticles on SA-CNTs film due to the electron donating ability of polydopamine,and therefore allowing a fast deposition during electroless copper plating.Finally,a uniform and compact copper coating was formed on the surface of SA-CNTs film.The effect of pre-activation with dopamine on electroless copper plating was studied by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),and water contact angle measurement.The electroless copper plating process was optimized through orthogonal test,and the surface morphology,phase structure,and electromagnetic shielding property of the copper coating obtained under the optimal conditions were analyzed.[Results]Pre-activation with dopamine made it possible to induce the electroless deposition of copper effectively and quickly.The plating bath kept stable during the plating process.The obtained copper coating featured a good adhesion and an electromagnetic shielding effectiveness up to 103.07 dB in the frequency range of 4-18 GHz.[Conclusion]It is beneficial to conduct electroless copper plating on the surface of SA-CNTs film by pre-activation with dopamine for improving its electromagnetic shielding performance,which is worthy of wide application in the manufacturing of flexible circuit boards.
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