Insights into Nucleation and Growth of Colloidal Quaternary Nanocrystals by Multimodal X-ray Analysis.
Insights into Nucleation and Growth of Colloidal Quaternary Nanocrystals by Multimodal X-ray Analysis.
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DOI：
10.1021/acsnano.0c08617
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发表时间：
2021-04-27
期刊：
影响因子：
17.1
通讯作者：
Ryan KM
中科院分区：
文献类型：
--
作者：
Just J;Coughlan C;Singh S;Ren H;Müller O;Becker P;Unold T;Ryan KM
铜硫属化物纳米晶体在光伏油墨、生物标签和热电材料中有应用。我们揭示了在各向异性Cu2ZnSnS4纳米晶体的合成过程中的成核和生长的见解，同时进行原位X射线吸收光谱（XAS）和小角X射线散射（SAXS）。实时XAFS显示，在将硫醇注入反应烧瓶中时，在几秒内形成关键的硫醇铜中间体物质，其在狭窄的温度和时间窗口内进一步分解以形成硫化铜纳米晶体。这些纳米晶体通过依次掺入Sn和Zn转化为Cu2ZnSnS4纳米棒。等分试样的实时SAXS和非原位TEM证实了这些发现。我们的工作演示了如何结合原位X射线吸收和小角X射线散射，使胶体的形成机制的途径的理解。
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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影响因子：
15
作者：
Guo, Qijie;Ford, Grayson M.;Agrawal, Rakesh
通讯作者：
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影响因子：
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