Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 47,
  • Issue 11,
  • pp. 1931-1942
  • (1993)

Surface Analysis of Excimer-Laser-Treated Polyethylene-Terephthalate by Surface-Enhanced Raman Scattering and X-Ray Photoelectron Spectroscopy

Not Accessible

Your library or personal account may give you access

Abstract

Silver and gold island films have been evaporated onto various polymer surfaces; the samples were characterized by surface-enhanced Raman spectroscopy (SERS), UV-visible spectroscopy, and x-ray photoelectron spectroscopy (XPS). Among the series of investigated polymers, the SERS spectra recorded on stretched polyethylene-terephthalate (PET) foils are unique with respect to resolution and intensity; the signal strengths are comparable to those observed in enhanced <i>resonance</i> Raman scattering. This exceptional behavior is attributed to the semicrystalline nature of the investigated material, and to the preferred interaction of the deposited silver with carbonyl groups of the polymer. The formation of a metal/polymer bond was established by the observation of corresponding bands in the XPS spectrum. Upon melting or amorphization of PET, the SERS intensities are reduced; this result is attributed to a decrease in the metal/polymer bond strength, due to changes in orientation of the phenyl rings and of the carbonyl groups on the polymer surface. The PET surfaces have been modified by excimer laser irradiation at the wavelengths of 308 and 248 nm. The characteristic laser-induced structuring of the surface, as revealed by scanning electron microscopy, is related to the biaxial stretching applied during production of the PET foils, and has been studied for various orientations of the samples and different laser fluences. As a consequence of irradiation, a loss of oxygen is detected by a decrease of the C 1<i>s</i> XPS bands assigned to carbon atoms with singly or doubly bound oxygen, and by an overall decrease of the oxygen-to-carbon ratio. The surface polarity is observed to decrease, as accompanied by a red shift of the absorption maximum for silver island films deposited onto the irradiated surfaces. SERS spectra recorded on these samples are weaker in intensity, as compared to those recorded on untreated PET foils. This decrease is interpreted in terms of partial amorphization of the sample accompanied by polymer reorientation, loss of the preferred anchoring sites for nucleation of silver islands, and changes in the surface structure and morphology.

PDF Article
More Like This
Laser-treated substrate with nanoparticles for surface-enhanced Raman scattering

Cheng-Hsiang Lin, Lan Jiang, Jun Zhou, Hai Xiao, Shean-Jen Chen, and Hai-Lung Tsai
Opt. Lett. 35(7) 941-943 (2010)

Noble metal modified ReS2 nanocavity for surface-enhanced Raman spectroscopy (SERS) analysis

Mingrui Shao, Chao Zhang, Jing Yu, Shouzhen Jiang, Xiaofei Zhao, Zhaoxiang Li, Weixi Lu, Baoyuan Man, and Zhen Li
Opt. Express 29(18) 28664-28679 (2021)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved