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SnSe nanocrystals: synthesis, structure, optical properties, and surface chemistry
William J Baumgardner1, Joshua J Choi, Yee-Fun Lim
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA. wjb87@cornell.edu
Journal of the American Chemical Society
|June 29, 2010
Summary
Colloidal synthesis of tin(II) selenide (SnSe) nanoparticles allows tunable sizes from 4-10 nm. This study explores quantum confinement, growth dynamics, surface chemistry, and electronic properties of these SnSe nanomaterials.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Chemistry
Background:
- Tin(II) selenide (SnSe) is a promising thermoelectric material.
- Controlling nanoparticle size and morphology is crucial for optimizing material properties.
Purpose of the Study:
- To develop a colloidal synthesis method for SnSe nanoparticles.
- To investigate the relationship between SnSe nanoparticle size and their electronic properties.
- To explore surface chemistry and anisotropic growth of SnSe nanocrystals.
Main Methods:
- Colloidal synthesis via precursor injection into a hot phosphine:selenium solution with oleylamine.
- Tuning nanoparticle size by controlling reaction temperature.
- Characterization using UV-vis-NIR spectroscopy.
- Ligand exchange experiments.
- Transient current-voltage measurements.
Main Results:
- Reliable synthesis of SnSe nanoparticles with tunable diameters (4-10 nm).
- Demonstrated quantum confinement effects by correlating particle size with band gap.
- Illuminated growth dynamics through spectroscopic analysis.
- Showcased successful ligand exchanges and pathways for anisotropic growth.
- Examined the optoelectronic properties of SnSe nanocrystal films.
Conclusions:
- Established a versatile colloidal synthesis for size-tunable SnSe nanoparticles.
- Provided insights into quantum confinement and growth mechanisms.
- Opened avenues for surface functionalization and controlled morphology.
- Characterized the fundamental electronic behavior of SnSe nanocrystal films.
