XPS Characterization of Porphyrin Based Self-Assembled Monolayers on Gold

Autor:	Wen Cai Wang, Guang Yan Liu
Rok vydání:	2012
Předmět:	chemistry.chemical_compound Crystallography chemistry X-ray photoelectron spectroscopy Chemisorption Tetraphenylporphyrin Inorganic chemistry Monolayer General Engineering Molecule Self-assembled monolayer Cyclic voltammetry Porphyrin
Zdroj:	Advanced Materials Research. 548:234-238
ISSN:	1662-8985
DOI:	10.4028/www.scientific.net/amr.548.234
Popis:	XPS characterization of self-assembled monolayers (SAMs) of tetraphenylporphyrin bearing a rigid tripodal linker by chemisorption of the thiol-derivatized terminal groups on gold substrate is described. The surface structure of the SAMs bearing tripodal linker were analyzed by X-ray photoelectron spectroscopy (XPS), and electrochemical cyclic voltammetry (CV) measurements. XPS confirms the formation of porphyrin SAMs on Au surface and identified bonding configurations of porphyrin molecules in the chemisorption of SAMs. The film thickness values (36 Å) obtained by XPS agree well with the estimated value by assuming the vertical orientation of the molecules on the gold surface. Using the Au4f7/2 as an internal standard, a lower binding energies shift (1.8 eV) of S2p in the SAMs reveals that the porphyrins were chemisorbed onto the surface via sulfurgold bonds. Electrochemical CV measurements suggest near monolayer coverage of the tripodal porphyrins with good stability of the redox SAMs, which have promising application in the development of molecular based electronic device and memory architectures.
Databáze:	OpenAIRE
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