期刊
ACS NANO
卷 15, 期 4, 页码 6439-6447出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c08617
关键词
colloidal nanocrystals; wurtzite; CZTS; nucleation and growth; quick-EXAFS; in situ EXAFS/XANES/SAXS
类别
资金
- Science Foundation Ireland (SFI) [16/IA/4629]
- SFI Centers
- MaREI
- AMBER [12/RC/2302_P2, 12/RC/2278_P2, 16/RC/3918]
- Irish Research Council (IRC) [IRCLA/2017/285]
The study reveals the formation process of Cu2ZnSnS4 nanocrystals through in situ X-ray absorption and small-angle X-ray scattering, uncovering the transformation pathway of key copper sulfide nanocrystal intermediate species.
Copper chalcogenide nanocrystals find applications in photovoltaic inks, bio labels, and thermoelectric materials. We reveal insights in the nucleation and growth during synthesis of anisotropic Cu2ZnSnS4 nanocrystals by simultaneously performing in situ X-ray absorption spectroscopy (XAS) and small-angle X-ray scattering (SAXS). Real-time XAFS reveals that upon thiol injection into the reaction flask, a key copper thiolate intermediate species is formed within fractions of seconds, which decomposes further within a narrow temperature and time window to form copper sulfide nanocrystals. These nanocrystals convert into Cu2ZnSnS4 nanorods by sequentially incorporating Sn and Zn. Real-time SAXS and ex situ TEM of aliquots corroborate these findings. Our work demonstrates how combined in situ X-ray absorption and small-angle X-ray scattering enables the understanding of mechanistic pathways in colloidal nanocrystal formation.
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