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231223s2007 xx ||||| 00| ||eng c |
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|a (DE-627)NLM169326373
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|a (NLM)17397202
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|a DE-627
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Nerambourg, Nicolas
|e verfasserin
|4 aut
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|a Quenching of molecular fluorescence on the surface of monolayer-protected gold nanoparticles investigated using place exchange equilibria
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 27.06.2007
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|a Date Revised 01.05.2007
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The insertion of fluorescently labeled thiols into the protecting self-assembled monolayer on the surface of gold nanoparticles through place exchange reactions and the effects of this insertion on the photophysical properties of the fluorophores are investigated. Analysis of solution-phase fluorescence data using a dynamic equilibrium model yields the equilibrium constant for the place exchange equilibrium, as well as the relative fluorescence brightness of the fluorophores on the particle surface. In all cases we find a significant quenching of the fluorescence, and potential reasons for this quenching are discussed. In the case of these relatively small particles (4.5 nm diameter), the quenching appears to be mainly related to enhanced nonradiative deactivation pathways. The place exchange equilibrium constant reveals a reduced affinity of the fluorescently labeled thiols for insertion into the nonfluorescent alkylthiol monolayer (K(eq) approximately 0.2) compared to unlabeled alkylthiols
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Fluorescent Dyes
|2 NLM
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|a Sulfhydryl Compounds
|2 NLM
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|a Gold
|2 NLM
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|a 7440-57-5
|2 NLM
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| 700 |
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|a Werts, Martinus H V
|e verfasserin
|4 aut
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|a Charlot, Marina
|e verfasserin
|4 aut
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|a Blanchard-Desce, Mireille
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 10 vom: 08. Mai, Seite 5563-70
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:10
|g day:08
|g month:05
|g pages:5563-70
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