Pulsed Laser Etching Of Polymers And Their Photoluminescent Properties

Researches on laser ablating polymer started in early 1980s, which has beenwidely used in many ways. For example, Using a UV laser photoablation method for theproduction of miniaturized liquid-handling systems on polymer substrate chips; Peopleetching PI for micropatterns by UV excimer laser, with this method, micropatterns withmicron-scale line-width and sub-micron depth have been successfully fabricated on PI;The surface of polymer (polyimide, polyethlene terephthalate) is modified by theirradiation from a focused excimer laser with wavelength of 248nm with differentenergy densities. These changes of structure can enhance the hydrophility of the surface.So far pulsed laser ablation has been widely applied to the surface modification ofpolymers, but the research about fluorescence performance of PE, PS ablated by pulsedlaser has not been reported in the literature. It has attracted much attention from us, wedecided do some research about it. In this thesis, a 1064nm pulsed laser was used toablate PE, PS using different current density. Compared to unmodified PE, PS on theirfluorescence property.We used a 1064nm pulsed laser to ablate PE, PS using different current density.The ablated PE, PS gave off obvious blue light under UV lamp irradiation. We study onmorphology of modified and unmodified PE, PS by scanning electron microscope,decide which one will be the right sample; The Fluorescence property of modified andunmodified PE, PS were studied by Fluorescence spectroscopy; The structure ofmodified and unmodified PE, PS were studied by IR spectroscopy, Raman spectroscopyand UV spectroscopy. We also used XPS to study the changes between modified andunmodified PS. The results showed that double bonds existed in the ablated PE, PS which resulted in its obvious blue emission and the intensity of the laser had greatinfluence on the physical properties and chemical structure of the PE surface.