| Luminescent and photocatalytically active carbon nitride nanocrystals dissolved in polar liquids Paul F Mcmillan1; Adam Clancy2; Christopher Howard2; Martin Wilding3; 1UNIVERSITY COLLEGE LONDON, London, United Kingdom; 2UCL, London, United Kingdom; 3UNIV MANCHESTER, Didcot, United Kingdom; PAPER: 106/Molten/Keynote (Oral) SCHEDULED: 16:20/Thu. 24 Oct. 2019/Ambrosia A (77/RF) ABSTRACT: Layered carbon nitrides based on a polytriazine imide (PTI) sheet structure crystallize as 50-100 nm particles with hexagonal columnar morphology following synthesis from precursors such as dicyandiamide (DCDA) in molten salt (LiCl/KCl or LiBr/KBr eutectic) solutions [1,2]. When the crystals are exposed to aprotic polar liquids including DMSO, DMF and NMP as well as H<sub>2</sub>O they dissolve spontaneously forming few-layered crystalline 2D nanosheets in solution. The solutions are photoluminescent and photocatalytically active [3,4]. Following solvent evaporation the layered nanomaterials re-stack in a crystalline arrangement giving rise to a broad range of emission wavelengths extending throughout the visible range [3,5]. We will present new results for the dissolution process and the 2D nanoparticles in solution using high energy X-ray and neutron scattering techniques. We also discuss the glass forming ability of the solutions to provide few-layered crystalline nanoparticles with tunable photoluminescence properties held in a solid matrix. References: [1] M.J. Bojdys et al, Chem Eur J 14 (2008) 8177 [2] E. Wirnhier et al, Chem Eur J 17 (2011) 3213 [3] T.S. Miller et al, Nano Letts 17 (2017) 5891 [4] K. Schwinghammer et al J Am Chem Soc 136 (2014) 1730 [5] T.M. Suter et al, Chem Sci 10 (2019) 2519 |
