Synthesis of ultrasmall platinum nanoparticles and structural relaxation

[Display omitted] •A synthetic method for ultrasmall Pt nanoparticles (∼1nm) is developed.•Compared to bulk Pt, structural relaxation is observed in the Pt nanoparticles.•The Pt 4f core level energy shifts positively by +1eV compared with bulk Pt. We report the synthesis of ligand-protected, ultrasm...

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Bibliographic Details
Published in:Journal of colloid and interface science 2014-06, Vol.423 (423), p.123-128
Main Authors: Liu, Chao, Li, Gao, Kauffman, Douglas R., Pang, Guangsheng, Jin, Rongchao
Format: Article
Language:English
Subjects:
8 kDa
Charge transfer
Chemistry
Colloidal state and disperse state
Electronics
Exact sciences and technology
General and physical chemistry
Ionization
Nanoclusters
Nanoparticles
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Platinum
Pt
Synthesis
Thiolate
Ultrasmall nanoparticles
X-ray photoelectron spectroscopy
X-rays
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Summary:[Display omitted] •A synthetic method for ultrasmall Pt nanoparticles (∼1nm) is developed.•Compared to bulk Pt, structural relaxation is observed in the Pt nanoparticles.•The Pt 4f core level energy shifts positively by +1eV compared with bulk Pt. We report the synthesis of ligand-protected, ultrasmall Pt nanoparticles of ∼1nm size via a one-phase wet chemical method. Using matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS), we determined the mass of the nanoparticles to be ∼8kDa. Characterization of the Pt nanoparticles was further carried out by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), optical absorption spectroscopy, and X-ray photoelectron spectroscopy (XPS). Interestingly, we observed a large structural relaxation in the 8kDa nanoparticles (i.e. lattice parameter elongation by +10%) compared to bulk platinum. XPS analysis revealed a positive shift of Pt 4f core level energy by approximately +1eV compared with bulk Pt, indicating charge transfer from Pt to S atom of the thiolate ligand on the particle. Compared to bulk Pt, the 5d band of Pt nanoparticles is narrower and shifts to higher binding energy. Overall, the ∼1nm ultrasmall Pt nanoparticles exhibit quite distinct differences in electronic and structural properties compared to their larger counterparts and bulk Pt.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2014.02.022