Advances on the performance and fabrication of low-background PTFE based electronic substrates by surface modification

Abstract

The weak signal from rare event is readily submerged in the background and thus results in substantial challenges in its detection, which spurs researchers to decrease the surroundings background of detectors as low as possible. To this end, a low-background non-adhesive polytetrafluoroethylene (PTFE) flexible copper-clad laminate (PTFE-FCCL) was prepared by surface treatment. Specifically, the PTFE substrate was processed by ion implantation and the transition layer deposition; the adhesion between PTFE and copper of PTFE-FCCL is found to remain stable after barely immersing in liquid nitrogen. Furthermore, the surface morphology and the dielectric properties of the substrate were characterized and tested. The results presented herein offer a novel method to fabricate electronic substrates that can facilitate rare event detection.