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The activity of Zn precursors determines the cation exchange reaction kinetics with Ag2S: Zn-doped Ag2S or Ag2S@ZnS QDs.
- Source :
- Nano Research; Oct2023, Vol. 16 Issue 10, p12315-12322, 8p
- Publication Year :
- 2023
-
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 Ag<subscript>2</subscript>S 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 Ag<subscript>2</subscript>S (Zn:Ag<subscript>2</subscript>S) and Ag<subscript>2</subscript>S@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:Ag<subscript>2</subscript>S 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 Ag<subscript>2</subscript>S@ZnS core–shell QDs. We anticipate that this finding will enrich the regulatory approaches of post-synthesis of colloidal nanocrystals with desirable properties. [ABSTRACT FROM AUTHOR]
- Subjects :
- EXCHANGE reactions
STERIC hindrance
QUANTUM dots
CATIONS
DESOLVATION
Subjects
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 16
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 172806786
- Full Text :
- https://doi.org/10.1007/s12274-023-5952-z