Dresden 2017 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Surface Dynamics: Experiments

O 90.5: Talk

Thursday, March 23, 2017, 11:30–11:45, WIL C107

The effect of chemical pressure on Ag+ cation substitution in CdSe nanocrystals — •Urko Petralanda, Luca De Trizio, Liberato Manna, and Sergey Artyukhin — Istituto Italiano di Tecnologia, Via Morego 30, Genova (Italy)

Cd2+ cations in CdSe nanocrystals experience, at ambient conditions, a fast and total replacement by Ag+ cations when exposed to the latter in an appropriate solvent [1,2]. A promising mechanism proposed to describe the cation exchange (CE) reactions is the so called kick-out mechanism [3,4], where the exchanged ions are considered to diffuse through interstitials. Within this framework, we use a tight binding model based on ab initio calculations to investigate the effect of chemical pressure on the CE reaction energy barrier and discuss the role played by different energy contributions.

[1] E. M. Chan, M. A. Marcus, S. Fakra, M. ElNaggar , R. A. Mathies, A. P. Alivisatos, J. Phys. Chem. A, 111, 12210 (2007). [2] L. De Trizio, L. Manna, Chem. Rev. 116, 10852 (2016). [3] U. Gösele, W. Frank, A. Seeger, Appl. Phys. 23, 361 (1980). [4] F. D. Ott, L. L. Spiegel, D. J. Norris, S. C. Erwin, Phys. Rev. Lett. 113, 156803 (2014).