Effect of irradiation conditions by swift heavy ions on the microstructure and composition of PMMA

摘要

Our research is devoted to the shrinkage and swelling of PMMA film after micro-structuring with ion beam lithography. 10 MeV O4+ ions were used in the experiment. Parallel lines of 1 mm in length and 10 mu m in thickness were created. The number of scan cycles and ion fluence were varied. The influence of the irradiation regime on PMMA elemental composition in micro-structured parts and microstructure morphology were studied. It was shown that microstructures created in PMMA film undergo both shrinkage and swelling processes depending on both the scan speed and the fluence. For the same fluence, shrinkage appears at fast scan speeds and swelling at slow ones. The same phenomenon was found in relation to the fluence for the same scan speed. It was observed that PMMA film rupture caused by irradiation occurred prior to the start of the carbonization of the irradiated area.