4He+ ion beam irradiation induced modification of poly(dimethylsiloxane). Characterization by infrared spectroscopy and ion beam analytical techniques

R. Huszánk, D. Szikra, A. Simon, S. Z. Szilasi, I. P. Nagy

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

In this study we investigated the chemical and surface wettability changes of poly(dimethylsiloxane) (PDMS) induced by a 2.0 MeV He+ beam irradiation. The chemical changes created in PDMS were characterized by universal attenuated total reflectance infrared (UATR-FTIR) spectroscopy, while the changes of the wettability were determined by contact angle measurements. In a separate analysis, hydrogen depletion was also investigated with a 1.6 MeV He+ beam by applying the elastic recoil detection analysis (ERDA) and Rutherford backscattering spectrometry techniques simultaneously. The ERDA results showed that the hydrogen content of PDMS decreased irreversibly, which means that volatile products were formed under radiolysis, such as hydrogen or methane. The results were completed with UATR-FTIR measurements. We propose a complete reaction mechanism for the processes taking place in PDMS. These ion beam induced processes, such as chain scissions, cross-linking, and depletion of small molecular weight fragments, lead to the formation of a silica-like final product (SiOx). The significant chemical changes at the surface influence the wettability of PDMS, making it considerably more hydrophilic. The penetration depth of the 2.0 MeV He+ ions is significantly higher compared to that of other surface modification techniques, which makes the modified layer thick and homogeneous; on the other hand, it is easily controllable by the energy of the incident ions.

Original languageEnglish
Pages (from-to)3842-3848
Number of pages7
JournalLangmuir
Volume27
Issue number7
DOIs
Publication statusPublished - Apr 5 2011

Fingerprint

Polydimethylsiloxane
wettability
Ion beams
Infrared spectroscopy
infrared spectroscopy
ion beams
Irradiation
irradiation
depletion
hydrogen
Wetting
Hydrogen
reflectance
products
radiolysis
cleavage
molecular weight
Ions
backscattering
ions

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

4He+ ion beam irradiation induced modification of poly(dimethylsiloxane). Characterization by infrared spectroscopy and ion beam analytical techniques. / Huszánk, R.; Szikra, D.; Simon, A.; Szilasi, S. Z.; Nagy, I. P.

In: Langmuir, Vol. 27, No. 7, 05.04.2011, p. 3842-3848.

Research output: Contribution to journalArticle

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