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Scanning angle Raman spectroscopy: A nondestructive method for simultaneously determining mixed polymer fractional composition and film thickness
Polymer
  • Jonathan M. Bobbitt, Iowa State University and Ames Laboratory
  • Deyny Mendivelso-Perez, Iowa State University and Ames Laboratory
  • Emily A. Smith, Iowa State University and Ames Laboratory
Document Type
Article
Disciplines
Publication Version
Accepted Manuscript
Publication Date
12-19-2016
DOI
10.1016/j.polymer.2016.10.063
Abstract

A scanning angle (SA) Raman spectroscopy method was developed to simultaneously measure the chemical composition and thickness of waveguide mixed polymer films with varying fractional compositions. In order to test the method, six films of polystyrene-block-poly(methyl methacrylate), some mixed with poly(methyl methacrylate) homopolymer (PS-b-PMMA:PMMA), and two films of poly(2-vinylnapthalene)-block-poly(methyl methacrylate) (P2VN-b-PMMA) were prepared. The film thickness ranged from 495 to 971 nm. The chemical composition and thickness of PS-b-PMMA:PMMA films was varied by the addition of the PMMA homopolymer and annealing the films in acetone. SA Raman peak amplitude ratios (1001 cm−1 for PS, 812 cm−1 for PMMA, and 1388 cm−1 for P2VN) were used to calculate the refractive index of the polymer film, an input parameter in calculations of the sum square electric field (SSEF). The film thickness was determined by SSEF models of the experimental Raman amplitudes versus the incident angle of light. The average film thickness determined by the developed SA Raman spectroscopy method was within 5% of the value determined by optical profilometry. SA Raman spectroscopy will be useful for in situ label-free analyses of mixed polymer waveguide films.

Comments

This is a manuscript of an article published as Bobbitt, Jonathan M., Deyny Mendivelso-Pérez, and Emily A. Smith. "Scanning angle Raman spectroscopy: A nondestructive method for simultaneously determining mixed polymer fractional composition and film thickness." Polymer 107 (2016): 82-88. DOI: 10.1016/j.polymer.2016.10.063. Posted with permission.

Creative Commons License
Creative Commons Attribution-Noncommercial-No Derivative Works 4.0
Copyright Owner
Elsevier Ltd.
Language
en
File Format
application/pdf
Citation Information
Jonathan M. Bobbitt, Deyny Mendivelso-Perez and Emily A. Smith. "Scanning angle Raman spectroscopy: A nondestructive method for simultaneously determining mixed polymer fractional composition and film thickness" Polymer Vol. 107 (2016) p. 82 - 88
Available at: http://works.bepress.com/emily-smith/42/