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Monodispersed ZnSe colloidal microspheres: preparation, characterization, and their 2D arrays
Haizheng Zhong1, Zhixiang Wei, Mingfu Ye
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100080, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 14, 2007
Summary
Uniform zinc selenide (ZnSe) microspheres were synthesized using a hot injection method. Their size was controlled by precursor concentration, showing potential for photonic band gap crystals.
Area of Science:
- Materials Science
- Nanotechnology
- Colloid Chemistry
Background:
- Colloidal semiconductor microspheres are crucial for advanced optical applications.
- Developing methods for size-controlled synthesis of uniform microspheres is essential.
- Zinc Selenide (ZnSe) exhibits unique optical properties suitable for photonic devices.
Purpose of the Study:
- To synthesize uniform and monodispersed ZnSe colloidal microspheres.
- To investigate the influence of precursor concentration on microsphere size.
- To explore the potential of these microspheres as building blocks for photonic crystals.
Main Methods:
- Hot injection synthesis using trioctylamine as a solvent.
- Tuning microsphere size by varying precursor concentrations (0.05–0.10 kg/L).
- Characterization using SEM, TEM, HRTEM, EDS, UV-vis, and PL techniques.
Main Results:
- Uniform and monodispersed ZnSe colloidal microspheres with sizes ranging from 138 to 629 nm were successfully prepared.
- Microsphere size showed a linear correlation with Zinc Oleate concentration.
- Characterization confirmed microspheres formed from aggregated ZnSe nanoparticles.
- 2D ordered assembly of microspheres was achieved via vertical precipitation.
Conclusions:
- The hot injection method provides effective control over ZnSe microsphere size and uniformity.
- The synthesized ZnSe microspheres are promising building blocks for photonic band gap crystals due to their optical properties.
- Further development could lead to novel functional devices utilizing these colloidal microspheres.
