Zamani, Reza; Ibanez Sabate, MariaIST Austria ; Luysberg, Martina; García Castelló, Nuria; Houben, Lothar; Prades, Joan; Grillo, Vincenzo; Dunin Borkowski, Rafal; Morante, Joan; Cabot, Andreu; Arbiol, Jordi
An appropriate way of realizing property nanoengineering in complex quaternary chalcogenide nanocrystals is presented for Cu2Cd xSnSey(CCTSe) polypods. The pivotal role of the polarity in determining morphology, growth, and the polytypic branching mechanism is demonstrated. Polarity is considered to be responsible for the formation of an initial seed that takes the form of a tetrahedron with four cation-polar facets. Size and shape confinement of the intermediate pentatetrahedral seed is also attributed to polarity, as their external facets are anion-polar. The final polypod extensions also branch out as a result of a cation-polarity-driven mechanism. Aberration-corrected scanning transmission electron microscopy is used to identify stannite cation ordering, while ab initio studies are used to show the influence of cation ordering/distortion, stoichiometry, and polytypic structural change on the electronic band structure.
The research leading to these results has received funding from the European Union Seventh Framework Programme under grant agreement 312483-ESTEEM2 (Integrated Infrastructure InitiativeI3) for using advance electron microscopes at ER-C Jülich. J.A. acknowledges the funding from the Spanish MICINN project MAT2010-15138 (COPEON) and Generalitat de Catalunya 2009 SGR 770. R.R.Z. acknowledges the former. The authors would also like to thank the TEM facilities in Serveis Cientificotecnics from Universitat de Barcelona. N.G.-C. acknowledges the Spanish MECD for her Ph.D. grant in the FPU program. JR and RZ acknowledge funding from MULTICAT and NANOENESTO projects.
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Zamani R, Ibáñez M, Luysberg M, et al. Polarity-driven polytypic branching in Cu-based quaternary chalcogenide nanostructures. ACS Nano. 2014;8(3):2290-2301. doi:10.1021/nn405747h
Zamani, R., Ibáñez, M., Luysberg, M., García Castelló, N., Houben, L., Prades, J., … Arbiol, J. (2014). Polarity-driven polytypic branching in Cu-based quaternary chalcogenide nanostructures. ACS Nano. American Chemical Society. https://doi.org/10.1021/nn405747h
Zamani, Reza, Maria Ibáñez, Martina Luysberg, Nuria García Castelló, Lothar Houben, Joan Prades, Vincenzo Grillo, et al. “Polarity-Driven Polytypic Branching in Cu-Based Quaternary Chalcogenide Nanostructures.” ACS Nano. American Chemical Society, 2014. https://doi.org/10.1021/nn405747h.
R. Zamani et al., “Polarity-driven polytypic branching in Cu-based quaternary chalcogenide nanostructures,” ACS Nano, vol. 8, no. 3. American Chemical Society, pp. 2290–2301, 2014.
Zamani R, Ibáñez M, Luysberg M, García Castelló N, Houben L, Prades J, Grillo V, Dunin Borkowski R, Morante J, Cabot A, Arbiol J. 2014. Polarity-driven polytypic branching in Cu-based quaternary chalcogenide nanostructures. ACS Nano. 8(3), 2290–2301.
Zamani, Reza, et al. “Polarity-Driven Polytypic Branching in Cu-Based Quaternary Chalcogenide Nanostructures.” ACS Nano, vol. 8, no. 3, American Chemical Society, 2014, pp. 2290–301, doi:10.1021/nn405747h.