Self-assembled layers of alkanethiols on copper for protection against corrosion
- Keio Univ., Yokohama (Japan)
Self-assembled monolayers of alkanethiols C[sub n]H[sub 2n+1]SH(n = 6 [approximately] 18) adsorbed on the surface of a polycrystalline bulk cu were constructed and characterized by x-ray photoelectron (XPS) and surface-enhanced Raman scattering (SERS) spectroscopy and contact angle and impedance measurements. The protection ability of the alkanethiol monolayers against Cu corrosion in an aerated 0.5 M Na[sub 2]SO[sub 4] solution was examined by impedance and polarization techniques. Results of XPS, SERS, and contact angle measurements showed that alkanethiols were chemisorbed on the Cu surface by the formation of strong bonds between Cu and S atoms following cleavage of a S-H bond and formed densely packed, water-repellent monolayers on the surface. The advancing contact angle of these monolayer films was comparable to that of alkanethiolate monolayers adsorbed at a vapor-deposited Cu on a Si wafer. However, sufficiently high protection abilities of the films against Cu corrosion were not obtained in 0.5 M Na[sub 2]SO[sub 4]. A preliminary experiment demonstrated the formation of a promising protective film which was prepared on the Cu surface by modification of self-assembled 11-mercapto-1undecanol monolayer with octyltrichlorosilane to form cross-linkages between the thiol molecules with siloxane bonds.
- OSTI ID:
- 6449173
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:2; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ADSORPTION
ALKALI METAL COMPOUNDS
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
CORROSION PROTECTION
CORROSION RESISTANCE
CRYSTALS
DATA
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LASER SPECTROSCOPY
LAYERS
MATERIALS TESTING
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
POLYCRYSTALS
RAMAN SPECTROSCOPY
SEPARATION PROCESSES
SODIUM COMPOUNDS
SODIUM SULFATES
SORPTION
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS
TESTING
THIOLS
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY