Abstract
ZnSe/ZnS nanocrystals were synthesized using the TOP/TOPO mild chemistry approach. Shell thickness was varied by changing the shell precursor concentration. Corresponding structural variation was investigated monitoring X-ray diffraction peak shifts. High-resolution transmission electron microscopy images revealed that ZnSe/ZnS nanocrystals with thick shell have crystalline imperfections such as stacking faults due to the heavy compressive strain by ZnS shell. The red- and blue-shifts in photoluminescence (PL) spectra according to the shell thickness were identified to originate from the extension of electron wave function of ZnSe to the shell and the compressive strain of the core, respectively. The PL spectra also showed increase and decrease in the peak intensity with shell thickness due to the surface passivation effect and stacking faults, respectively.
| Original language | English |
|---|---|
| Article number | 1036 |
| Journal | Journal of Nanoparticle Research |
| Volume | 14 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2012 Aug |
Bibliographical note
Funding Information:Acknowledgments This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korean Government (2011-0002789; 2011-0011205) and by the International Collaborative R&D Program (2011-BS-101002-002) funded by Ministry of Knowledge Economy, Korea (MKE, Korea) in 2011. Also, this work was supported by Korea University grants (2010) (Y.-M. Sung). This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korean Government (MEST) (2011-0028769) (T. G. Kim).
Keywords
- Core/shell
- Nanocrystals
- Photoluminescence (PL)
- Shell thickness
- ZnSe/ZnS
ASJC Scopus subject areas
- Bioengineering
- General Chemistry
- Atomic and Molecular Physics, and Optics
- Modelling and Simulation
- General Materials Science
- Condensed Matter Physics