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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1021/la202364c
|2 doi
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|a pubmed24n0701.xml
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|a eng
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| 100 |
1 |
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|a Roy, Shibsekhar
|e verfasserin
|4 aut
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|a Label-free optical characterization methods for detecting amine silanization-driven gold nanoparticle self-assembly
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 29.12.2011
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|a Date Revised 31.08.2011
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2011 American Chemical Society
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|a Fluorescence lifetime correlation spectroscopy (FLCS) is presented as a single-step label-free detection method for probing the amine silanization-driven spontaneous 3D self-assembly of freestanding gold nanoparticles (GNPs) in solution. Unlike the conventional methods of studying self-assembly, for example, UV-vis spectroscopy and electron microscopy, FLCS utilizes the intrinsic gold fluorescence. The significance of this approach is to amalgamate the measurement of optical and hydrodynamic size properties simultaneously to achieve a more coherent description of the self-assembly pathway. GNP self-assembly has two-stage kinetics. Electrostatic interaction drives the initial amine silanization, and this is followed by siloxane bond formation between hydrolyzed ethoxy groups of GNP-attached APTES, resulting in the formation of micrometer-sized superstructures. The self-assembly has resulted in a 5-fold increase in the fluorescence lifetime (FL), and the FLCS study has shown an 8- to 10-fold increase in the diffusion coefficient using the pure diffusion model. This result is consistent with the transmission electron microscopy (TEM) observation, which shows a few hundred fold increase in the diameter due to assembly formation by the GNPs
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Amines
|2 NLM
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|a Silanes
|2 NLM
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|a Gold
|2 NLM
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|a 7440-57-5
|2 NLM
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1 |
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|a Dixit, Chandra K
|e verfasserin
|4 aut
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|a Woolley, Robert
|e verfasserin
|4 aut
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| 700 |
1 |
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|a O'Kennedy, Richard
|e verfasserin
|4 aut
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| 700 |
1 |
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|a McDonagh, Colette
|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 27(2011), 17 vom: 06. Sept., Seite 10421-8
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:27
|g year:2011
|g number:17
|g day:06
|g month:09
|g pages:10421-8
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|u http://dx.doi.org/10.1021/la202364c
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