Laser ablation of poly(ethylene terephthalate)

Abstract

Laser ablation of a poly(ethylene terephthalate) (PET) film with an excimer laser beam, 248 nm, was analyzed by various analysis methods, and the mechanism was studied. The ablation was carried out in an argon gas atmosphere at room temperature. Produced gases and some fragments were collected and analyzed by GC-MS. The photochemical fragmentation of PET through the Norrish type I reaction was dominant, but above the threshold fluence, ca. 30 mJ/cm 2 , thermal reactions such as cyclic oligomerization occurred and photochemical fragmentation was accelerated by the thermal energy.

Laser interference lithography as a new and efficient technique for micropatterning of biopolymer surface

“…With increase of laser fluence, the O content decreases while the C content increases. This is in agreement with the results obtained by Lazare and Srinivasan (193 nm) [22] and by Watanabe and Yamamoto using KrF eximer laser (248 nm) [23]. The relative weight of C species is shown in Fig.…”

“…This suggests that the decomposition took place mainly in ester group. Watanabe and Yamamoto [23] analyzed the emitted substances using an excimer laser (248 nm) and GC-MS in detail. At low fluence (10-30 mJ/cm 2 ), the substance consists of CH 2 =CH 2 , CO and CO 2 , while at higher fluence (50 mJ/cm 2 ) C 6 H 6 appear.…”

Effects of XeCl excimer laser treatment of Vectran® fibers and their adhesion to epoxy resin

“…As a result, this process reduces the O/C ratio on the fiber surface. This process has been confirmed by Watanabe and Yamamoto [30] who used GC-MS to analyze the gases and fragments produced through laser ablation of the PET film. The second process is the free radicals generated by photochemical and photothermal degradations resulting from the laser-PET interaction, which should be similar to laser-Vectran ® interaction in this study, because of the chemical similarities [31].…”

Preparation and characterization of multi-walled carbon nanotube (MWCNTs)-supported Pt-Ru catalyst for methanol electrooxidation

“…The method of preparation was similar to what was described by Watanabe et al [12]. Firstly, the Pt sulfite and Ru sulfite complexes was synthesized in aqueous solution, and then it was oxidative decomposed by the addition of hydrogen peroxide and simultaneously adsorbed onto activated MWCNTs or XC-72 suspended in the solution.…”

“…Finally, the origin of the feature is unclear, but may be indicative of loosely bound C O. Carbon monoxide fragmentation has been known to produce CO fragments at characteristic BE = 536.4 eV [12]. The origin of the fourth peak may be the result of fragmentation of the tethered COO groups.…”