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Correlation between Chemical Modification and Generated Refractive Index on Ion Implanted PMMA
Published online by Cambridge University Press: 25 February 2011
Abstract
The optical characteristics of polymethylmetacrylate (PMMA) can be changed selectively with the aid of ion implantation. This can be explained by the manner in which the chain molecules are decomposed by the bombardment. New binding states can be identified by means of XPS on the irradiated surface and traced throughout the implantation depth using dynamic SIMS. In order to avoid chemical reactions, inert gas ions, ranging from He to Xe, have been implanted at energies between 100 keV and 380 keV, and fluences from 1 × 1013 /cm2 to 7 × 1015 /cm2. The results indicate a correlation of the refractive index and the surface layer contraction with surface CH- and COH-groups generation (XPS) and with in-depth damage described by the emission of secondary ions with masses 26 and 42 (SIMS), assigned to (CH2)- and (C2OH2)-.
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- Copyright © Materials Research Society 1992