Infrared absorption enhancement of p-cyanobenzoic acid on silver island films deposited on oxidized and hydrogen-terminated Si(100) surfaces

T. Wadayama, O. Suzuki, Y. Suzuki, A. Hatta

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Infrared absorption measurements of thin p-cyanobenzoic acid (PCBA) films have been performed in the Kretschmann ATR geometry in which an island film of silver was deposited in vacuum onto an oxidized or hydrogen-terminated silicon(100) prism surface. It is found that in comparison to the normal ATR measurement (without silver) of PCBA on the oxidized Si(100) surface the absorption intensity of the v(C ≡ N) mode is approximately an order of magnitude enhanced by the presence of a silver island film of 5 nm in mass thickness on that surface but a more enhancement by a factor of 1.7 is obtained with the same thickness of silver on the H-terminated Si(100) surface. The different magnitudes of the absorption enhancement are explained on the basis of the FE-SEM micrographs of silver islands prepared on oxidized and H-terminated Si(100) wafers. A more detailed analysis shows that the enhancement occurs not only for ionized PCBA adsorbed via the carboxylate group on surface silver oxide, but for hydrogen-bonded PCBA presumably condensed on the ionized species. This observation is explained in terms of an electromagnetic field enhancement at the metal island surfaces.

Original languageEnglish
Pages (from-to)501-506
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume64
Issue number5
Publication statusPublished - 1997 May

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Infrared absorption enhancement of p-cyanobenzoic acid on silver island films deposited on oxidized and hydrogen-terminated Si(100) surfaces'. Together they form a unique fingerprint.

  • Cite this