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Research Article

The activity of Zn precursors determines the cation exchange reaction kinetics with Ag2S: Zn-doped Ag2S or Ag2S@ZnS QDs

Zhiyong Tang1,2, Hongchao Yang1( ), Ziqiang Sun1, Yejun Zhang1( ), Guangcun Chen1,2, Qiangbin Wang1,2( )
CAS Key Laboratory of Nano-Bio Interface, Division of Nanobiomedicine and i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
Nano Science and Technology Institute, University of Science and Technology of China, Hefei 230026, China
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Graphical Abstract

Reasonable control of Zn precursor chemistry needs to be considered when designing of nanocrystals by affecting cation exchange protocols. By applying this method, high-quality Zn-doped Ag2S quantum dots (QDs) and Ag2S@ZnS QDs with a cubic phase ZnS shell were synthesized successfully.

Abstract

Cation exchange (CE) has been emerged as a promising post-synthesis strategy of colloidal nanocrystals. However, it is unclear how the cation precursor affects the CE process and the final colloidal nanocrystals. Herein, we utilized two Zn-B Lewis acid-base adduct complexes (B = oleylamine (OAM) and methanol (MeOH)) as Zn precursors for CE with Ag2S quantum dots (QDs). Our study revealed that the steric hindrance and complexing capabilities of Zn precursor significantly affect the CE kinetics. As a result, the Zn-doped Ag2S (Zn:Ag2S) and Ag2S@ZnS core–shell QDs were successfully obtained with enormous enhancement of their photoluminescence (PL) intensities. Theoretical simulation showed that the Zn-OAM with higher desolvation energy and spatial hindrance tended to form doped Zn:Ag2S QDs due to the inefficient cation exchange. Whereas the Zn-MeOH with lower exchange barrier promoted the conversion of Ag-S to Zn-S, thus forming Ag2S@ZnS core–shell QDs. We anticipate that this finding will enrich the regulatory approaches of post-synthesis of colloidal nanocrystals with desirable properties.

Keywords

cation exchangeAg2S quantum dotsphase structuredesolvationcoordination

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Nano Research
Volume 16 Issue 10,
October 2023
Pages 12315-12322
DOI: 10.1007/s12274-023-5952-z
Cite this article:
Tang Z, Yang H, Sun Z, et al. The activity of Zn precursors determines the cation exchange reaction kinetics with Ag2S: Zn-doped Ag2S or Ag2S@ZnS QDs. Nano Research, 2023, 16(10): 12315-12322. https://doi.org/10.1007/s12274-023-5952-z
Topics:
Semiconductor quantum dots
Part of a topical collection:
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Received: 17 February 2023
Revised: 30 May 2023
Accepted: 23 June 2023
Published: 05 August 2023
© Tsinghua University Press 2023
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