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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 | Source: | 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. | Document URI: | http://hdl.handle.net/1942/22021 | ISSN: | 1616-301X | e-ISSN: | 1616-3028 | DOI: | 10.1002/adfm.201504857 | ISI #: | 000379731500010 | Rights: | © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2017 |
Appears in Collections: | Research publications |
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