Preparation And Study The Structural And Optical Properties Of Polyethylene Glycol Thin Films Doped With Rhodamine 6g Dye.

Abstract

To prepare polymeric films with optical properties that can be applied in optical sensors and other electro-optical devices, thin films of polyethylene glycol polymer were prepared by spin-coating on glass substrates and then doped with different percentages of rhodamine 6G dye (2 and 4 wt.%). FE-Scanning electron microscope images it was shown that the prepared films have homogeneous and regular surfaces and contain some minor defects, and that the addition of rhodamine dye does not affect the morphology of the prepared films. The X-ray diffraction patterns showed that all samples had a polycrystalline structure and that the crystalline state improved after doping with rhodamine dye. Diagnosis of optical properties was performed using a UV-Vis spectrophotometer. Absorption, transmittance, absorption coefficient, and optical gap energy were measured and studied, in addition to the optical constants represented by the extinction coefficient and refractive index at the wavelength range from 300 to 650 nm. The clear effect of doping with rhodamine dye on these optical parameters was demonstrated. The effect of doping with rhodamine dye and the behavior of the refractive index with the energy of the incident photon indicate the possibilities of applying these thin films in routers and optical sensors.