Document Detail

Oxygen attachment on alkanethiolate SAMs induced by low-energy electron irradiation.
MedLine Citation:
PMID:  23537075     Owner:  NLM     Status:  MEDLINE    
Reactions of (18)O2 with self-assembled monolayer (SAM) films of 1-dodecanethiol, 1-octadecanethiol, 1-butanethiol, and benzyl mercaptan chemisorbed on gold were studied by the electron stimulated desorption (ESD) of anionic fragments over the incident electron energy range 2-20 eV. Dosing the SAMs with (18)O2 at 50 K results in the ESD of (18)O(-) and (18)OH(-). Electron irradiation of samples prior to (18)O2 deposition demonstrates that intensity of subsequent (18)O(-) and (18)OH(-) desorption signals increase with electron fluence and that in the absence of electron preirradiation, no (18)O(-) and (18)OH(-) ESD signals are observed, since oxygen is unable to bind to the SAMs. A minimum incident electron energy of 6-7 eV is required to initiate the binding of (18)O2 to the SAMs. O2 binding is proposed to proceed by the formation of CHx-1(•) radicals via resonant dissociative electron attachment and nonresonant C-H dissociation processes. The weaker signals of (18)O(-) and (18)OH(-) from short-chain SAMs are related to the latter's resistance to electron-induced damage, due to the charge-image dipole quenching and electron delocalization. Comparison between the present results and those for DNA oligonucleotides self-assembled on Au (Mirsaleh-Kohan, N. et al. J. Chem. Phys. 2012, 136, 235104) indicates that the oxygen binding mechanism is common to both systems.
Sylvain Massey; Andrew D Bass; Marie Steffenhagen; Léon Sanche
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2013-04-15
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  29     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-05-01     Completed Date:  2013-11-11     Revised Date:  2014-05-07    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5222-9     Citation Subset:  IM    
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MeSH Terms
Alkanes / chemistry*
Oxygen / chemistry*
Sulfhydryl Compounds / chemistry*
Grant Support
81356-2//Canadian Institutes of Health Research; //Canadian Institutes of Health Research
Reg. No./Substance:
0/Alkanes; 0/Sulfhydryl Compounds; S88TT14065/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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