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Proceedings Paper

Vaporization and deposition of an intact polyimide precursor by resonant infrared pulsed laser ablation
Author(s): N. L. Dygert; K. E. Schriver; R. F. Haglund Jr.
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Paper Abstract

Poly(amic acid) (PAA), a precursor to polyimide, was successfully deposited on substrates without reaching curing temperature, by resonant infrared pulsed laser ablation. The PAA was prepared by dissolving pyromellitic dianhydride and 4, 4' oxidianiline in the polar solvent N-methyl pyrrolidinone (NMP). RIR-PLD transferred material showed two distinct geometries, droplets and string-like moieties. The unaltered nature of the deposited PAA was confirmed by Fourier transform infrared spectroscopy (FTIR). Thermal curing was achieved by heating for one hour on a 250°C hotplate, and the transformation to polyimide was demonstrated from changes in the FTIR spectrum following curing. Plume shadowgraphy showed very clear contrasts in the ablation mechanism between ablation of the solvent alone and the ablation of the PAA, with additional contrast shown between the various resonant frequencies used.

Paper Details

Date Published: 23 February 2006
PDF: 9 pages
Proc. SPIE 6107, Laser-based Micropackaging, 61070N (23 February 2006); doi: 10.1117/12.646906
Show Author Affiliations
N. L. Dygert, Vanderbilt Univ. (United States)
K. E. Schriver, Vanderbilt Univ. (United States)
R. F. Haglund Jr., Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 6107:
Laser-based Micropackaging
Friedrich G. Bachmann; Willem Hoving; Yongfeng Lu; Kunihiko Washio, Editor(s)

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