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Morphology-Conserving Non-Kirkendall Anion Exchange of Metal Oxide Nanocrystals

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Title
Morphology-Conserving Non-Kirkendall Anion Exchange of Metal Oxide Nanocrystals
Author(s)
Yongjun Lim; Chang-Hee Lee; Chul-Ho Jun; Kwanpyo Kim; Jinwoo Cheon
Subject
CATION-EXCHANGE, ; DIFFUSION, ; IRON, ; NANOPARTICLES, ; NANOSCALE, ; TRANSFORMATIONS
Publication Date
2020-05
Journal
Journal of the American Chemical Society, v.142, no.20, pp.9130 - 9134
Publisher
AMER CHEMICAL SOC
Abstract
© 2020 American Chemical Society.Nanoscale dynamic processes such as the diffusion of ions within solid-state structures are critical for understanding and tuning material properties in a wide range of areas, such as energy storage and conversion, catalysis, and optoelectronics. In the generation of new types of nanocrystals (NCs), diffusion-mediated ion exchange reactions have also been proposed as one of the most effective transformational strategies. However, retaining the original morphology and crystal structure of metal oxide NCs has been challenging because of Kirkendall void formation, and there has been no success, especially for anion exchange. Here we show that with the aid of an oxygen extracting reagent (OER), anion diffusion is dramatically accelerated and morphology-conserving anion exchange without Kirkendall void formation is possible. In the case of the conversion of Fe3O4 to Fe3S4, oxygen extraction and subsequent formation of the amorphous phase facilitate the migration of incoming sulfur anions by approximately 100-fold, which is close to the level of the outgoing cation diffusivity. We also demonstrate that the working principle of the morphology-conserving non-Kirkendall anion exchange is operative for metal oxide NCs with different shapes and crystal structures
URI
https://pr.ibs.re.kr/handle/8788114/7861
DOI
10.1021/jacs.0c03230
ISSN
0002-7863
Appears in Collections:
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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