Hybrid Oleate-Iodide Ligand Shell for Air-Stable PbSe Nanocrystals and Superstructures
J L Peters1, J C van der Bok1, J P Hofmann2
1Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands.
Chemistry of Materials : a Publication of the American Chemical Society
|August 20, 2019
Summary
A novel postsynthetic treatment enhances the air stability of lead selenide (PbSe) nanocrystals using a hybrid ligand shell of Pb(oleate)2 and iodide. This passivation strategy maintains optical properties for days under ambient conditions.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Lead selenide (PbSe) nanocrystals (NCs) are promising for optoelectronic applications.
- Their practical use is limited by poor air stability.
- Developing effective passivation strategies is crucial for their integration.
Purpose of the Study:
- To develop a postsynthetic treatment to enhance the air stability of PbSe NCs and superstructures.
- To investigate the formation of a hybrid ligand shell for improved passivation.
- To analyze the impact of the treatment on the surface chemistry and optical properties.
Main Methods:
- Postsynthetic treatment using a combination of Pb(oleate)2 and iodide ligands.
- Air stability assessment via in-situ absorption spectroscopy under ambient conditions.
- Surface chemistry analysis using Fourier transform infrared (FTIR) spectroscopy.
Main Results:
- The hybrid ligand shell significantly improves air stability, maintaining unchanged absorption spectra for several days.
- Fourier transform infrared spectroscopy revealed a shift from mixed chelating bidentate + bridging to almost exclusive chelating bidentate coordination of oleate ligands.
- The oleate hydrocarbon layer exhibited a more liquid-like state, suggesting adjacent oleate and iodide ligand placement.
Conclusions:
- A postsynthetic hybrid ligand treatment effectively passivates PbSe nanocrystals against air degradation.
- The chemical modification of surface ligands enhances stability without compromising optical properties.
- This method offers a viable route for improving the durability of PbSe-based nanomaterials.
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