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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/22021

Title: Benchtop Fluorination of Fluorescent Nanodiamonds on a Preparative Scale: Toward Unusually Hydrophilic Bright Particles
Authors: Havlik, Jan
Raabova, Helena
Gulka, Michal
Petrakova, Vladimira
Krecmarova, Marie
Masek, Vlastimil
Lousa, Petr
Stursa, Jan
Boyen, Hans-Gerd
Nesladek, Milos
Cigler, Petr
Issue Date: 2016
Citation: ADVANCED FUNCTIONAL MATERIALS, 26(23), p. 4134-4142
Abstract: Fluorination of diamonds modulates their optical and electromagnetic proper- ties and creates surfaces with increased hydrophobicity. In addition, fluorina- tion of diamonds and nanodiamonds has been recently shown to stabilize fluorescent nitrogen-vacancy centers, which can serve as extremely sensitive single atomic defects in a vast range of sensing applications from quantum physics to high-resolution biological imaging. Traditionally, fluorination of carbon nanomaterials has been achieved using harsh and complex experi- mental conditions, creating hydrophobic interfaces with difficult dispersibility in aqueous environments. Here, a mild benchtop approach to nanodiamond fluorination is described using selective Ag+-catalyzed radical substitution of surface carboxyls for fluorine. In contrast to other approaches, this high- yielding procedure does not etch diamond carbons and produces a highly hydrophilic interface with mixed C−F and C−OH termination. This dual func- tionalization of nanodiamonds suppresses detrimental hydrophobic interac- tions that would lead to colloidal destabilization of nanodiamonds. It is also demonstrated that even a relatively low surface density of fluorine contributes to stabilization of negatively charged nitrogen-vacancy centers and boosts their fluorescence. The simultaneous control of the surface hydrophilicity and the fluorescence of nitrogen-vacancy centers is an important issue enabling direct application of fluorescent nanodiamonds as nanosensors for quantum optical and magnetometry measurements operated in biological environment.
URI: http://hdl.handle.net/1942/22021
DOI: 10.1002/adfm.201504857
ISI #: 000379731500010
ISSN: 1616-301X
Category: A1
Type: Journal Contribution
Validation: ecoom, 2017
Appears in Collections: Research publications

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