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Synthetic routes, characterization and photophysical properties of luminescent, surface functionalized nanodiamonds

Day, Adam H., Adams, Samuel J., Gines, Laia ORCID:, Williams, Oliver A., Johnson, Benjamin R. G., Fallis, Ian A. ORCID:, Loveridge, E. Joel, Bahra, Gurmit S., Oyston, Petra C. F., Herrera, Juan Manuel and Pope, Simon J. A. ORCID: 2019. Synthetic routes, characterization and photophysical properties of luminescent, surface functionalized nanodiamonds. Carbon 152 , pp. 335-343. 10.1016/j.carbon.2019.05.081

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The functionalization of small diameter (ca. 50 nm) polycarboxylated nanodiamond particles using amide coupling methodologies in both water and acetonitrile solvent has been investigated. In this manner, the surfaces of nanodiamond particles were adorned with different luminescent moieties, including a green fluorescent 1,8-naphthalimide species (Nap-1), and a red emitting ruthenium(II) tris-bipyridine complex (Ru-1), as well as dual functionalization with both luminophores. Comprehensive characterization of the surface functionalized nanodiamonds has been achieved using a combination of dynamic light scattering, nanoparticle tracking analysis, transmission electron microscopy, X-ray photoelectron spectroscopy, zeta potential measurements, microwave plasma atomic emission spectroscopy and time-resolved photophysics. The tendency of the functionalized nanodiamonds to aggregate reflects the degree of surface substitution, yielding small aggregates with typical particle sizes ca. 150 nm. This is likely to be driven by the reduction of the zeta potential, concomitant with the conversion of surface charged carboxylate groups to neutral amide functions. The results show that luminescent nanodiamond materials can be synthesised with tuneable photophysical properties.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Elsevier
ISSN: 0008-6223
Date of First Compliant Deposit: 18 June 2019
Date of Acceptance: 31 May 2019
Last Modified: 21 Jun 2024 22:40

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