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Surface-Enhanced Raman Spectroscopy as a Method for Determining Surface Structures

Mary L. Lewis, Keith T. Carron

Open publisher page 8 citations

Abstract

We report the results and interpretation of a surface-enhanced Raman spectroscopic (SERS) study of benzimidazole, benzotriazole, and benzimidazole-2-thione on copper surfaces in aggressive media. We have found that SERS is an excellent tool for the study of corrosion inhibition on copper. SERS has enabled us to carry out in situ chemical analysis, isotopic substitution, and orientation determination for the inhibitors on copper. The results indicate an important role of the bridgehead heteroatom in imidazole compounds. We found that the progression of corrosion inhibition is benzimidazole < benzotriazole < benzimidazole-2-thione. Our orientation study of benzimidazole indicates that it is predominantly flat on copper surfaces.

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What this paper is about

We report the results and interpretation of a surface-enhanced Raman spectroscopic (SERS) study of benzimidazole, benzotriazole, and benzimidazole-2-thione on copper surfaces in aggressive media. We have found that SERS is an excellent tool for the study of corrosion inhibition on copper. SERS has enabled us to carry out in situ chemical analysis, isotopic substitution, and orientation determination for the inhibitors on copper. The results indicate an important role of the bridgehead heteroatom in imidazole compounds. We found that the progression of corrosion inhibition is benzimidazole < benzotriazole < benzimidazole-2-thione. Our orientation study of benzimidazole indicates that it is predominantly flat on copper surfaces.

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Available abstract

We report the results and interpretation of a surface-enhanced Raman spectroscopic (SERS) study of benzimidazole, benzotriazole, and benzimidazole-2-thione on copper surfaces in aggressive media. We have found that SERS is an excellent tool for the study of corrosion inhibition on copper. SERS has enabled us to carry out in situ chemical analysis, isotopic substitution, and orientation determination for the inhibitors on copper. The results indicate an important role of the bridgehead heteroatom in imidazole compounds. We found that the progression of corrosion inhibition is benzimidazole < benzotriazole < benzimidazole-2-thione. Our orientation study of benzimidazole indicates that it is predominantly flat on copper surfaces.

Key concepts: Benzotriazole, Benzimidazole, Imidazole, Raman spectroscopy, Copper, Heteroatom, Surface-enhanced Raman spectroscopy, Materials science

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