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- Title
Copper Acetate Etching of Colloidal CdSe Nanocrystals.
- Authors
Yang, Boping; Zhang, Huichao; Zhang, Jiayu
- Abstract
Colloidal CdSe nanocrystals (NCs) were etched after Se/TBP and Zinc stearate/ODE were injected into the mixture of as-prepared CdSe NCs and Copper (II) acetate in ODE solvent. Spectroscopic and structural investigations demonstrate the etching process. Along with the etching time, both the absorption and photoluminescence (PL) spectra of etched NCs showed blue-shift while the transmission electron microscopy (TEM) images indicated that the size of the NCs became from 5.6nm to 2.6nm. X-ray diffraction (XRD) patterns suggested that no other clusters or core/shell NCs were formed in the etching process and inductively coupled plasma (ICP) data demonstrated that only selenium and cadmium comprised the etched NCs. Electronic paramagnetic resonance (EPR) spectra indicated the deoxidization of Cu ions and suggested the etching mechanism through cation exchange process. A maneuverable method for etching colloidal CdSe NCs was demonstrated. The NCs were etched for 40 min, decreased to ~46% of their original size, and maintained effective emissive properties and a favorable structure. No new clusters were formed and no other elements were interfused into the CdSe NCs during etching. The etching mechanism was speculated through the EPR spectra of the samples, before and after reaction.
- Subjects
COPPER compounds; ETCHING reagents; COLLOIDS; NANOCRYSTALS; SOLVENT analysis; SPECTROMETRY
- Publication
NANO, 2016, Vol 11, Issue 2, p-1
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292016500211