Revealing Cation-Exchange-Induced Phase Transformations in Multielemental Chalcogenide Nanoparticles

Joel M.R. Tan, Mary C. Scott, Wei Hao, Tom Baikie, Christopher T. Nelson, Srikanth Pedireddy, Runzhe Tao, Xingyi Ling, Shlomo Magdassi, Timothy White, Shuzhou Li, Andrew M. Minor, Haimei Zheng, Lydia H. Wong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

To control the process of cation exchange (CE) in a multielemental system, a detailed understanding of structural changes at the microscopic level is imperative. However, the synthesis of a multielemental system has so far relied on the CE phenomenon of a binary system, which does not necessarily extend to the higher-order systems. Here, direct experimental evidence supported by theoretical calculations reveals a growth model of binary Cu-S to ternary Cu-Sn-S to quaternary Cu-Zn-Sn-S, which shows that cations preferentially diffuse along a specific lattice plane with the preservation of sulfuric anionic framework. In addition, we also discover that, unlike the commonly accepted structure (P63mc), the metastable crystal structure of Cu-Zn-Sn-S phase possesses fixed Sn occupancy sites. By revealing the preferential nature of cations diffusion and growth mechanism, our work provides insight into controlling the stoichiometry and phase purity of novel multielemental materials.

Original languageAmerican English
Pages (from-to)9192-9199
Number of pages8
JournalChemistry of Materials
Volume29
Issue number21
DOIs
StatePublished - 14 Nov 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

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