Surfactant-induced postsynthetic modulation of Pd nanoparticle crystallinity.
- Materials Science Division
Modulation of Pd nanoparticle (NP) crystallinity is achieved by switching the surfactants of different binding strengths. Pd NPs synthesized in the presence of weak binding surfactants such as oleylamine possess polyhedral shapes and a polycrystalline nature. When oleylamine is substituted by trioctylphosphine, a much stronger binding surfactant, the particles become spherical and their crystallinity decreases significantly. Moreover, the Pd NPs reconvert their polycrystalline structure when the surfactant is switched back to oleylamine. Through control experiments and molecular dynamics simulation, we propose that this unusual nanocrystallinity transition induced by surfactant exchange was resulted from a counterbalance between the surfactant binding energy and the nanocrystal adhesive energy. The findings represent a novel postsynthetic approach to tailoring the structure and corresponding functional performance of nanomaterials.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; Exxon Mobil; Chinese Academy of Sciences
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1018909
- Report Number(s):
- ANL/MSD/JA-70054
- Journal Information:
- Nano Lett., Journal Name: Nano Lett. Journal Issue: Feb. 2011 Vol. 11; ISSN 1530-6984
- Country of Publication:
- United States
- Language:
- ENGLISH
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