Document Detail


Oxygen attachment on alkanethiolate SAMs induced by low-energy electron irradiation.
MedLine Citation:
PMID:  23537075     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Sylvain Massey; Andrew D Bass; Marie Steffenhagen; Léon Sanche
Related Documents :
24002025 - A corrole-azafullerene dyad: synthesis, characterization, electronic interactions and p...
22964845 - Ultrafast exciton dynamics in type ii znte-znse colloidal quantum dots.
23685765 - An electron-rich free-standing carbon@au core-shell nanofiber network as a highly activ...
24222735 - Wet chemical controllable synthesis of hematite ellipsoids with structurally enhanced v...
18043185 - Corneal lamellar dissection by using suture threads in porcine eyes.
17181325 - Infrared vibrational autodetachment spectroscopy of microsolvated benzonitrile radical ...
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    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Alkanes / chemistry*
Electrons*
Oxygen / chemistry*
Sulfhydryl Compounds / chemistry*
Grant Support
ID/Acronym/Agency:
81356-2//Canadian Institutes of Health Research; //Canadian Institutes of Health Research
Chemical
Reg. No./Substance:
0/Alkanes; 0/Sulfhydryl Compounds; S88TT14065/Oxygen
Comments/Corrections

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


Previous Document:  Adverse events associated with botulinum toxin injection: A multidepartment, retrospective study of ...
Next Document:  Red blood cell distribution and survival in patients with chronic obstructive pulmonary disease.