Metallization of a thiol-terminated organic surface using chemical vapor deposition
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chair:
Rajalingam, K. / Strunskus, T. / Terfort, A. / Fischer, R. / Wöll, Ch. (2008)
- place: Langmuir 24 (2008), 15, 7986-7994
- Date: 2008
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Rajalingam, K. / Strunskus, T. / Terfort, A. / Fischer, R. / Wöll, Ch. (2008): "Metallization of a thiol-terminated organic surface using chemical vapor deposition". In: Langmuir 24 (2008), 15, 7986-7994
Abstract
The deposition and the subsequent decomposition of an organometallic precursor, (?3-allyl)(?5-cyclopentadienyl)palladium [Cp(allyl)Pd], on an organic surface exposed by self-assembled monolayers (SAM) was studied using X-ray photoelectron spectroscopy (XPS) and infrared reflection absorption spectroscopy (IRRAS).
The interfacial chemical reactions of the vapor-deposited metal precursor with the pendant thiol group of the SAMs made from oligophenyldithiols, which are either prepared directly (terphenyldimethyldithiol, TPDMT) or by a deprotection route from SAMs formed by a monoacylated derivative of biphenyldimethyldithiol (dep. BPDMAc-1) have been studied in detail.
When the TPDMT-SAMs were exposed to Cp(allyl)Pd vapor, a Pd2+/allyl-terminated SAM surface was obtained (to a lower extent this was also the case for dep. BPDMAc-1 SAMs), which was stable against exposure to H2 gas. Reduction to Pd0 by H2 was only observed when small amounts of Pd0 were already present, for example, after prolonged exposure to the precursor. The catalytic activity of the small Pd0 particles also caused a decomposition of the SAMs upon exposure to air.
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The interfacial chemical reactions of the vapor-deposited metal precursor with the pendant thiol group of the SAMs made from oligophenyldithiols, which are either prepared directly (terphenyldimethyldithiol, TPDMT) or by a deprotection route from SAMs formed by a monoacylated derivative of biphenyldimethyldithiol (dep. BPDMAc-1) have been studied in detail.
When the TPDMT-SAMs were exposed to Cp(allyl)Pd vapor, a Pd2+/allyl-terminated SAM surface was obtained (to a lower extent this was also the case for dep. BPDMAc-1 SAMs), which was stable against exposure to H2 gas. Reduction to Pd0 by H2 was only observed when small amounts of Pd0 were already present, for example, after prolonged exposure to the precursor. The catalytic activity of the small Pd0 particles also caused a decomposition of the SAMs upon exposure to air.
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