Colloidally stable germanium nanocrystals for photonic applications
Eric J Henderson1, Makoto Seino, Daniel P Puzzo
1Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.
ACS Nano
|November 11, 2010
Summary
Researchers developed a simple method to create stable germanium nanocrystals. These nanocrystals serve as a solution-processable precursor for fabricating functional thin films, demonstrating their use in creating high refractive index films.
Area of Science:
- Materials Science
- Nanotechnology
- Inorganic Chemistry
Background:
- Germanium nanocrystals are promising for thin film fabrication.
- Solution-processable precursors are essential for bottom-up fabrication techniques.
- Controlling nanocrystal stability and processability is crucial for device applications.
Purpose of the Study:
- To develop a straightforward synthesis for colloidally stable germanium nanocrystals.
- To utilize these germanium nanocrystals as solution-processable precursors for thin film fabrication.
- To demonstrate the fabrication of functional thin films using these nanocrystals.
Main Methods:
- Synthesis of SiO(2)-embedded germanium nanocrystals via reductive thermal processing of sol-gel glasses derived from tetraethoxyorthogermanate (TEOG) and tetraethoxyorthosilicate (TEOS).
- Liberation of free-standing germanium nanocrystals through sequential chemical etching to remove the encapsulating silicon dioxide.
- Fabrication of thin films using the synthesized germanium nanocrystals as a solution-processable precursor.
Main Results:
- Successfully synthesized colloidally stable germanium nanocrystals.
- Demonstrated the effectiveness of sequential chemical etching for obtaining free-standing nanocrystals.
- Fabricated high refractive index thin films, showcasing the material's applicability.
Conclusions:
- A straightforward synthesis for stable germanium nanocrystals has been established.
- These germanium nanocrystals are effective solution-processable precursors for thin film fabrication.
- The developed method enables the creation of functional thin films with high refractive indices.
