PTFE films are films of the polymer polytetrafluoroethane. Polytetrafluoroethylene is one of the most important high insulating organic polymer electret materials, which have been applied in many fields such as sensors, generators and motors, dose-meters, and air-filters at high temperature.

PTFE films are ultimate in durability, low stretch, high strength, high temperature, non-stick protection for lamination lay ups and roll end wraps. PTFE have several advantages related to both orienting properties and processibility. They are easy to prepare, chemically inert, thermally stable, optically transparent and of low cost.

Preparation of the PTFE Film
Thin films of PTFE are prepared by pulsed laser deposition from bulk PTFE targets using 157 nm F2-laser radiation. The Teflon films are analyzed by means of optical polymerization microscopy, stylus profilometry, XPS, XRD, FTIR spectroscopy and by capacitance measurements. The effect of substrate temperature on the morphology and crystallinity is studied. Films treated at sufficiently high temperature consist mainly of spherulite like crystallites. Films with a thickness of more than about 155 nm are continuous, pinhole free, well adherent to the substrate and have a composition which is similar to that of the target material. The minimum film thickness and deposition rates are much lower than achieved with pressed PTFE powder targets using 248 nm KrF- laser ablation. This is related to different deposition mechanisms. Correspondingly, the morphology, crystallinity, and the optical and dielectric properties of films significantly differ from each other.