X-Ray-Absorption Fine-Structure Spectroscopy Study of the Interactions between Contaminant Tetrahedral Anions and Self-Assembled Monolayers on Mesoporous Supports

2001 ◽  
Vol 105 (27) ◽  
pp. 6337-6346 ◽  
Author(s):  
S. D. Kelly ◽  
K. M. Kemner ◽  
G. E. Fryxell ◽  
J. Liu ◽  
S. V. Mattigod ◽  
...  
Keyword(s):  
Fine Structure ◽  
Self Assembled Monolayers ◽  
Spectroscopy Study ◽  
X Ray ◽  
Absorption Fine ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Mesoporous Supports ◽  
X Ray Absorption

CHARACTERISATION OF INTERFACIAL BONDING AND PHOTOCHEMISTRY IN SELF-ASSEMBLED THIOL MONOLAYERS ON GOLD USING NEXAFS AND ARUPS

1994 ◽  
Vol 01 (04) ◽  
pp. 701-704 ◽  
Author(s):  
H. RIELEY ◽  
N.J. PRICE ◽  
R.G. WHITE ◽  
R.I.R. BLYTH ◽  
L. HÅKANSSON ◽  
...  
Keyword(s):  
Fine Structure ◽  
Oxidation State ◽  
Interfacial Bonding ◽  
Ex Situ ◽  
Self Assembled Monolayers ◽  
X Ray ◽  
Thiol Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
X Ray Absorption

S K-edge near-edge X-ray absorption fine structure (NEXAFS) has been used to establish the oxidation state of S in self-assembled monolayers (SAMs) of heptane and octane thiols, RSH [ R=CH 3( CH 2)n, n=6, 7] and the analogous halo-alkane disulphides, [(X RS )2, X= Cl , Br ] derivatised ex situ on Au foil. We find that the initially prepared surface thiolate species (RS–) is photo-oxidised by X-radiation, in the presence of coadsorbed oxygen, to sulphonate [Formula: see text]. Angle-resolved UV photoemission (ARUPS) has been used to further characterise the nature of the S-Au interaction in these SAMs following their preparation in UHV on Au(111). The ARUPS results suggest the involvement of the Au d-bands in the S-Au bond.

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