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Nanostructured gold layers. III. Functionalization of gold layers obliquely deposited onto polystyrene substrate

I. ZGURA1, T. BEICA1, S. FRUNZA1, L. FRUNZA1,* , C. COTIRLAN-SIMIONIUC1, F. UNGUREANU1, N. GHEORGHE1, O. RASOGA1, T. VELULA1, C. ZAHARIA2

Affiliation

  1. National Institute of Materials Physics
  2. Institute of Virology St. S. Nicolau of the Romanian Academy

Abstract

Hexadecanethiol monolayers were self-assembled onto nanostructured gold layers (10-20 nm) deposited onto glass by using an intermediate polystyrene layers (50 nm). We found that these glass plates with an intermediate PS layer do not peel under overnight immersing in ethanol solution of hexadecanethiol. The thiol and gold layers were characterized by several methods such as X-ray diffraction, X-ray photoelectron spectroscopy, spectroellipsometry (SE) and Raman spectroscopy. The thickness of the thiol layer was estimated from SE measurements to be ca 1 nm, meaning less than the length of the molecule; it was then inferred that the molecule is tilted onto gold, as expected from the behavior of other self assembled monolayers (SAMs) obtained under similar conditions. It is noteworthy that the alignment of a nematic liquid crystal in a cell having the plates deposited with the hexadecanethiol SAMs is still uniform, despite the multilayer structure of the substrate on the glass plates..

Keywords

Nanostructured gold layer, Polystyrene substrate, Alkanethiol SAM, Alignment of liquid crystals.

Submitted at: March 18, 2010
Accepted at: Aug. 12, 2010

Citation

I. ZGURA, T. BEICA, S. FRUNZA, L. FRUNZA, C. COTIRLAN-SIMIONIUC, F. UNGUREANU, N. GHEORGHE, O. RASOGA, T. VELULA, C. ZAHARIA, Nanostructured gold layers. III. Functionalization of gold layers obliquely deposited onto polystyrene substrate, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 8, pp. 1729-1738 (2010)