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Grazing-incidence neutron-induced fluorescence probes density profiles of labeled molecules at solid/liquid interfaces

We report on the use of characteristic prompt γ-fluorescence after neutron capture induced by an evanescent neutron wave to probe densities and depth profiles of labeled molecules at solid/liquid interfaces. In contrast to classical scattering techniques and X-ray fluorescence, this method of “grazi...

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Hauptverfasser: Schneck, Emanuel (VerfasserIn) , Jentschel, Michael (VerfasserIn) , Gege, Christian (VerfasserIn) , Tanaka, Motomu (VerfasserIn) , Demé, Bruno (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: March 5, 2013
In: Langmuir
Year: 2013, Jahrgang: 29, Heft: 12, Pages: 4084-4091
ISSN:1520-5827
DOI:10.1021/la400162y
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/la400162y
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Verfasserangaben:Emanuel Schneck, Michael Jentschel, Christian Gege, Motomu Tanaka, and Bruno Demé

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520 |a We report on the use of characteristic prompt γ-fluorescence after neutron capture induced by an evanescent neutron wave to probe densities and depth profiles of labeled molecules at solid/liquid interfaces. In contrast to classical scattering techniques and X-ray fluorescence, this method of “grazing-incidence neutron-induced fluorescence” combines direct chemical specificity, provided by the label, with sensitivity to the interface, inherent to the evanescent wave. We demonstrate that the formation of a supported lipid membrane can be quantitatively monitored from the characteristic fluorescence of 157Gd3+ ions bound to the headgroup of chelator lipids. Moreover, we were able to localize the 157Gd3+ ions along the surface normal with nanometer precision. This first proof of principle with a well-defined model system suggests that the method has a great potential for biology and soft matter studies where spatial resolution and chemical sensitivity are required. 
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