Microstructural effects on surface mechanical properties of ion-implanted polymersReportar como inadecuado


Microstructural effects on surface mechanical properties of ion-implanted polymers


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Tefzel, a copolymer of tetrafluoroethylene and ethylene, was implanted simultaneouslywith 400 keV boron, 700 keV nitrogen, and 600 keV carbon to a dose of3 X 10¹⁵ ions-cm² for each ion. The implanted layer was examined using transmissionelectron microscope and compared with the pristine Tefzel for microstructural changes.The microhardness of the implanted and pristine Tefzel was determined using ananoindentation technique. TEM bright-field images of the implanted layer show apatch-type contrast with distinguishable bright and dark regions. Electron energy lossspectroscopy EELS was used to show that the bright regions had a higher carbonconcentration, as compared with the dark regions. The carbon-rich regions had anaverage size of approximately 40 nm. The pristine material showed a fairly featurelesscontrast with occasional local patchy regions. These were determined to be due to localthickness variations. The triple implantation improved the hardness of pristine Tefzelby over 66 times. The structure of the carbon-rich regions appears to be clusters of sp²bonded C atoms with sp³ sites present and hydrogen preferentially bonded in the sp³ Cconfiguration. It was speculated that the carbon-rich regions could be harder than thesurrounding regions, but this could not be resolved due to the small size of the regions.



Center for Nanoscience and Nanotechnology Publications -



Autor: Rao, G. R. - Wang, Z. L. Zhong Lin - Lee, E. H. - -

Fuente: https://smartech.gatech.edu/







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