dc.creator | Johnson, Stephen Lee | |
dc.date.accessioned | 2020-08-22T20:45:01Z | |
dc.date.available | 2010-08-11 | |
dc.date.issued | 2008-08-11 | |
dc.identifier.uri | https://etd.library.vanderbilt.edu/etd-08082008-140048 | |
dc.identifier.uri | http://hdl.handle.net/1803/13854 | |
dc.description.abstract | Resonant infrared (RIR) laser ablation of two model polymer systems is studied.
A tunable free-electron laser (FEL) operating in the mid-infrared is used to resonantly excite vibrational modes of polystyrene and poly(ethylene glycol) to initiate
ablation. Time-resolved shadowgraph images, coupled with etch-depth measurements
and temperature-rise calculations indicate that ablation begins after a superheated
surface layer reaches a temperature of ~1000 C and undergoes spinodal decomposition. The majority of the ablated material is then expelled by way of recoil-induced ejection as the pressure of the expanding vapor plume compresses a laser-melted area. For the first time, a consistent argument is presented to describe RIR polymer
ablation from beginning to end.
Applications of RIR ablation are also emonstrated through thin-film growth of
electronic and optoelectronic polymers. Conductive coatings of a commercially available thiophene polymer are made through a vapor-phase growth process, and polymer light-emitting diodes (PLEDs) are made by laser-transfer of a poly(phenylene vinylene) light-emitting polymer in vacuum. The functionality of the deposited films indicates that the RIR laser ablation process does not entirely decompose the con-
jugation of the polymers. The mechanisms derived from ablation studies on model polymer systems are used to explain various observations relating to film quality and device performance. | |
dc.format.mimetype | application/pdf | |
dc.subject | laser ablation | |
dc.subject | polymers | |
dc.subject | laser | |
dc.subject | infrared laser ablation | |
dc.subject | pulsed-laser deposition | |
dc.subject | polymer thin-films | |
dc.title | Resonant-infrared laser ablation of polymers: mechanisms and applications | |
dc.type | dissertation | |
dc.contributor.committeeMember | Ronald Schrimpf | |
dc.contributor.committeeMember | Eva Harth | |
dc.contributor.committeeMember | Kenneth Schriver | |
dc.contributor.committeeMember | Shane Hutson | |
dc.type.material | text | |
thesis.degree.name | PHD | |
thesis.degree.level | dissertation | |
thesis.degree.discipline | Physics | |
thesis.degree.grantor | Vanderbilt University | |
local.embargo.terms | 2010-08-11 | |
local.embargo.lift | 2010-08-11 | |
dc.contributor.committeeChair | Richard F. Haglund, Jr. | |