ORALS

SESSION: MoltenThuPM2-R1	Angell International Symposium on Molten Salt, Ionic & Glass-forming Liquids: Processing and Sustainability (7th Intl. Symp. on Molten Salt, Ionic & Glass-forming Liquids: Processing and Sustainability).
Thu Oct, 24 2019 / Room: Ambrosia A (77/RF)
Session Chairs: Georges Kipouros; Giancarlo Jug; Session Monitor: TBA

16:20: [MoltenThuPM210] Keynote
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 Id: 106 [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 H₂O 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