Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 24, Pages 13413-13420Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp302485g
Keywords
-
Funding
- Natural Sciences and Engineering Research Council of Canada
- Fonds de la recherche sur la nature et les technologies
Ask authors/readers for more resources
Stable PtAu alloy colloids with a wide range of compositions were prepared using pulsed laser ablation on single metal-mixture targets in water. The concentration of Pt in the alloys can be tuned by varying the Pt/Au ratio in the targets, which are made by compression molding a mixture of Pt and Au powders at different ratios. Such fabricated Pt Au alloy nanoparticles (NPs) show a face-centered cubic structure, and their composition basically follows that of their corresponding targets. The effect of aqueous solution pH and ablating laser fluence on the formation and structure of alloy NPs was further investigated. It is found that Pt Au alloy colloids of identical composition can be achieved over a pH range extending from 4.0 to 11.0 and at fluences varying from 4 to 150 J cm(-2) as long as the targets of the same composition are used. This finding suggests that alloy formation is essentially insensitive to both factors in certain ranges, and the method developed herein for the alloy NP formation is quite robust. Moreover, the surface composition, estimated from electrochemical measurements, is identical to the overall composition of the NPs estimated from Vegard's law and X-ray diffraction data, which is a strong indication of the uniform composition on the surface and in the interior of these alloy NPs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available