Oxygen Diffusion into Multiwalled Carbon Nanotube Doped Polystrene Latex Films Using Fluorescence Technique


YARGI Ö. , UĞUR Ş., PEKCAN M. Ö.

JOURNAL OF FLUORESCENCE, cilt.23, ss.357-366, 2013 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 23 Konu: 3
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1007/s10895-013-1157-2
  • Dergi Adı: JOURNAL OF FLUORESCENCE
  • Sayfa Sayısı: ss.357-366

Özet

This study examines the oxygen diffusion into polystyrene (PS) latex/multiwalled carbon nanotube (MWNT) nanocomposite films (PS/MWNT) consisting of various amounts of MWNT via steady state fluorescence technique (SSF). PS/MWNT films were prepared from the mixture of MWNT and pyrene (P)-labeled PS latexes at various compositions at room temperature. These films were then annealed at 170 A degrees C above glass transition (T-g) temperature of PS. Fluorescence quenching measurements were performed for each film separately to evaluate the effect of MWNT content on oxygen diffusion. The Stern-Volmer equation for fluorescence quenching is combined with Fick's law for diffusion to derive the mathematical expressions. Diffusion coefficients (D) were produced and found to be increased from 1.1 x 10(-12) to 41 x 10(-12) cm(2)s(-1) with increasing MWNT content. This increase was explained via the existence of large amounts of pores in composite films which facilitate oxygen penetration into the structure.