Post-synthesis phase and shape evolution of CsPbBr 3 colloidal nanocrystals: The role of ligands. Fanizza, E.; Cascella, F.; Altamura, D.; Giannini, C.; Panniello, A.; Triggiani, L.; Panzarea, F.; Depalo, N.; Grisorio, R.; Suranna, G.; Agostiano, A.; Curri, M.; and Striccoli, M. Nano Research, Tsinghua University Press, 2019. cited By 7
Post-synthesis phase and shape evolution of CsPbBr 3 colloidal nanocrystals: The role of ligands [link]Paper  doi  abstract   bibtex   
The surface chemistry of colloidal cesium lead bromide (CsPbBr 3 ) nanocrystals is decisive in determining the stability and the final morphology of this class of materials, characterized by ionic structure and a high defect tolerance factor. Here, the high sensitivity of purified colloidal nanocubes of CsPbBr 3 to diverse environmental condition (solvent dilution, ageing, ligands post synthetic treatment) in ambient atmosphere is investigated by means of a comprehensive morphological (electron microscopy), structural (θ/2θ X-ray diffraction (XRD) and grazing incidence wide angle scattering (GIWAXS)), and spectroscopic chemical ( 1 H nuclear magnetic resonance (NMR), nuclear Overhauser effect spectroscopy (NOESY), absorption and emission spectroscopy) characterization. The aging and solvent dilution contribute to modify the nanocrystal morphology, due to a modification of the ligand dynamic. Moreover, we establish the ability of aliphatic carboxylic acids and alkyl amines ligands to induce, even in a post preparative process at room temperature, structural, morphological and spectroscopic variations. Upon post synthesis alkyl amine addition, in particular of oleyl amine and octyl amine, the highly green emitting CsPbBr 3 nanocubes effectively turn into one-dimensional (1D) thin tetragonal nanowires or lead halide deficient rhombohedral zero-dimensional (0D) Cs 4 PbBr 6 structures with a complete loss of fluorescence. The addition of an alkyl carboxylic acid, as oleic and nonanoic acid, produces the transformation of nanocubes into still emitting orthorombic two-dimensional (2D) nanoplates. The acid/base equilibrium between the native and added ligands, the adsorbed/free ligands dynamic in solution and the ligand solubility in non-polar solvent contribute to render CsPbBr 3 particularly sensitive to environmental and processing conditions and, therefore prone to undergo to structural, morphological and, hence spectroscopic, transformations.[Figure not available: see fulltext.]. © 2019, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
@ARTICLE{Fanizza2019,
author={Fanizza, E. and Cascella, F. and Altamura, D. and Giannini, C. and Panniello, A. and Triggiani, L. and Panzarea, F. and Depalo, N. and Grisorio, R. and Suranna, G.P. and Agostiano, A. and Curri, M.L. and Striccoli, M.},
title={Post-synthesis phase and shape evolution of CsPbBr 3 colloidal nanocrystals: The role of ligands},
journal={Nano Research},
year={2019},
doi={10.1007/s12274-019-2371-2},
note={cited By 7},
url={https://www.scopus.com/inward/record.uri?eid=2-s2.0-85064205902&doi=10.1007%2fs12274-019-2371-2&partnerID=40&md5=a24bbab6343af25cf68202850b452659},
abstract={The surface chemistry of colloidal cesium lead bromide (CsPbBr 3 ) nanocrystals is decisive in determining the stability and the final morphology of this class of materials, characterized by ionic structure and a high defect tolerance factor. Here, the high sensitivity of purified colloidal nanocubes of CsPbBr 3 to diverse environmental condition (solvent dilution, ageing, ligands post synthetic treatment) in ambient atmosphere is investigated by means of a comprehensive morphological (electron microscopy), structural (θ/2θ X-ray diffraction (XRD) and grazing incidence wide angle scattering (GIWAXS)), and spectroscopic chemical ( 1 H nuclear magnetic resonance (NMR), nuclear Overhauser effect spectroscopy (NOESY), absorption and emission spectroscopy) characterization. The aging and solvent dilution contribute to modify the nanocrystal morphology, due to a modification of the ligand dynamic. Moreover, we establish the ability of aliphatic carboxylic acids and alkyl amines ligands to induce, even in a post preparative process at room temperature, structural, morphological and spectroscopic variations. Upon post synthesis alkyl amine addition, in particular of oleyl amine and octyl amine, the highly green emitting CsPbBr 3 nanocubes effectively turn into one-dimensional (1D) thin tetragonal nanowires or lead halide deficient rhombohedral zero-dimensional (0D) Cs 4 PbBr 6 structures with a complete loss of fluorescence. The addition of an alkyl carboxylic acid, as oleic and nonanoic acid, produces the transformation of nanocubes into still emitting orthorombic two-dimensional (2D) nanoplates. The acid/base equilibrium between the native and added ligands, the adsorbed/free ligands dynamic in solution and the ligand solubility in non-polar solvent contribute to render CsPbBr 3 particularly sensitive to environmental and processing conditions and, therefore prone to undergo to structural, morphological and, hence spectroscopic, transformations.[Figure not available: see fulltext.]. © 2019, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.},
publisher={Tsinghua University Press},
issn={19980124},
document_type={Article},
source={Scopus},
}
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