Fine-tuning the crystal structure of CdSe quantum dots by varying the dynamic characteristics of primary alkylamine ligands
| Autor: | Li Wang, Wen-Sheng Lu, Enze Xu, Fengyi Wu, Zhongping Zhang, Yang Jiang, Zhifeng Zhu, Mingling Li, Chen Min |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Absorption spectroscopy technology industry and agriculture chemistry.chemical_element 02 engineering and technology General Chemistry Crystal structure Zinc equipment and supplies 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material 0104 chemical sciences Crystallography chemistry Quantum dot Phase (matter) General Materials Science 0210 nano-technology High-resolution transmission electron microscopy Wurtzite crystal structure |
| Zdroj: | CrystEngComm. 20:4492-4498 |
| ISSN: | 1466-8033 |
| DOI: | 10.1039/c8ce00414e |
| Popis: | Primary alkylamines are generally used as ligands for the synthesis of colloidal II–VI group quantum dots (QDs). However, knowledge of the effects of these ligands on the nanocrystalline structure in the literature is scarce and often contradictory. Herein, the structural evolution of CdSe QDs synthesized with primary alkylamines of different chain lengths and concentrations and at various reaction temperatures has been investigated. Absorption spectroscopy, XRD, HRTEM and Fourier transform imaging were applied to characterize the structure of the CdSe QDs. The results demonstrate that CdSe QDs preferentially form the wurtzite structure with shorter-chain and higher-concentration primary alkylamines at higher reaction temperatures. In contrast, the zinc blende structure is formed in the presence of longer-chain and lower-concentration primary alkylamines at lower reaction temperatures. By precisely controlling the experimental conditions, CdSe QDs with a pure zinc blende phase have been successfully achieved. |
| Databáze: | OpenAIRE |
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