The Electrical Properties And Microstructure Of An Ion Beam Mixed Metal-Polymer System

Ion beam mixing of the surface of polymers with metal films is done by ion implanting through a thin metal film. The metal layers are evaporated on the polymer substrate surface before ion implementation. A 50keV, nitrogen ion beam with a dose in the range of 10¹⁶ ions/cm² and a dose rate current of 100 and 200 uAmp mixes the metal and polymer at the interface. The polytetrafluorethylene samples (PTFE) mixed with Cr metal layers. The optical properties indicate surface and near-surface structure. SEM pictures show a smooth surface after implantation and cracks in the metal layer. The thermal damage results in gas evolution during implantation. The resistivity is reduced over the resistivity of ion implanted polymers no metal layer. The DC conductivity increases with increasing temperature. The temperature coefficient of resistance decreases with increasing metal layer thickness. Coulomb gap and thermal Hopping theories are used to fit the experiment data. The results show the thin Cr layer samples more like Coulomb gap conducting materials; the thick Cr layer samples more in the Hopping conducting regions. A possible model of ion implanted metal/polymer system is shown at the end of this thesis. The varying metal layer thickness results in the different microstructures. The mixing condition and metal layer thickness directly affects the conducting mechanism.

Name thesis:degree_name

Master of Science in Materials Science

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Physics, Astronomy, and Materials Science

Year

1999

Author dc:creator

• Huang, Runhui

Contributors dc:contributor

• Ryan Giedd

• Materials Science and Engineering

Statement dc:rights

• © Runhui Huang

Repository record dc:identifier

https://bearworks.missouristate.edu/theses/1005

OAI identifier oai:identifier

oai:bearworks.missouristate.edu:theses-2006