NDLI: Spatial Dependence of the Dipolar Interaction between Quantum Dots and Organic Molecules Probed by Two-Color Sum-Frequency Generation Spectroscopy

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Spatial Dependence of the Dipolar Interaction between Quantum Dots and Organic Molecules Probed by Two-Color Sum-Frequency Generation Spectroscopy

Content Provider	MDPI
Author	Noblet, Thomas Dreesen, Laurent Tadjeddine, Abderrahmane Humbert, Christophe
Copyright Year	2021
Description	Given the tunability of their optical properties over the UV–Visible–Near IR spectral range, ligand-capped quantum dots (QDs) are employed for the design of optical biosensors with low detection threshold. Thanks to non-linear optical spectroscopies, the absorption properties of QDs are indeed used to selectively enhance the local vibrational response of molecules located in their vicinity. Previous studies led to assume the existence of a vibroelectronic QD–molecule coupling based on dipolar interaction. However, no systematic study on the strength of this coupling has been performed to date. In order to address this issue, we use non-linear optical Two-Color Sum-Frequency Generation (2C-SFG) spectroscopy to probe thick QD layers deposited on calcium fluoride (CaF $2$ ) prisms previously functionalized by a self-assembled monolayer of phenyltriethoxysilane (PhTES) molecules. Here, 2C-SFG is performed in Attenuated Total Reflection (ATR) configuration. By comparing the molecular vibrational enhancement measured for QD–ligand coupling and QD–PhTES coupling, we show that the spatial dependence of the QD–molecule interactions (∼1/r $3$ , with r the QD–molecule distance) is in agreement with the hypothesis of a dipole–dipole interaction.
Starting Page	294
e-ISSN	20738994
DOI	10.3390/sym13020294
Journal	Symmetry
Issue Number	2
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2021-02-09
Access Restriction	Open
Subject Keyword	Symmetry Atomic, Molecular and Chemical Physics Quantum Dots Phenyl Derivative Uv–visible Spectroscopy Non-linear Optics Sum-frequency Generation Spectroscopy Centrosymmetry Dipole–dipole Interaction
Content Type	Text
Resource Type	Article

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