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Transition-Metal-Doped NIR-Emitting Silicon Nanocrystals
Sourov Chandra1, Yoshitake Masuda2, Naoto Shirahata1
1WPI International Centre for Nanoarchitectonics (MANA), National Institute for Materials science (NIMS), 1-1 Namiki, Tsukuba, 305-0044, Japan.
Angewandte Chemie (International Ed. in English)
|April 5, 2017
Summary
Transition metal doping of silicon nanocrystals (SiNCs) tunes their light emission properties. This study synthesized doped SiNCs, achieving significant photoluminescence shifts while preserving high quantum yields.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Chemistry
Background:
- Impurity-doping is crucial for tailoring nanocrystal electronic properties and applications.
- Silicon nanocrystals (SiNCs) offer unique optoelectronic characteristics.
- Controlling dopant incorporation in SiNCs is key to unlocking advanced functionalities.
Purpose of the Study:
- To synthesize transition metal (Mn, Ni, Co, Cu)-doped oleophilic silicon nanocrystals.
- To investigate the impact of metal doping on SiNC photoluminescence (PL) properties.
- To develop a method for producing stable, doped SiNCs for potential applications.
Main Methods:
- Hydrolysis/polymerization of triethoxysilane with metal salt solutions.
- Thermal disproportionation of the resulting gel into a doped-Si/SiO2 composite.
- Hydrofluoric acid etching and hydrosilylation with 1-n-octadecene for surface functionalization.
Main Results:
- Successfully synthesized octadecyl-capped doped SiNCs (3-8 nm diameter) with dopant concentrations <0.2 atom %.
- Observed a significant red-shift in SiNC photoluminescence (up to 270 nm) due to metal doping.
- Maintained high photoluminescence quantum yield, with Co-doped SiNCs reaching 26%.
Conclusions:
- Transition metal doping effectively modifies the optoelectronic properties of silicon nanocrystals.
- The developed synthesis route yields high-quality doped SiNCs with tunable photoluminescence.
- These doped SiNCs show promise for advanced optical and electronic applications.