In Situ X-ray Scattering Guides the Synthesis of Uniform PtSn Nanocrystals

Wu, Liheng; Fournier, Amanda P.; Willis, Joshua J.; Cargnello, Matteo; Tassone, Christopher J.

doi:10.1021/acs.nanolett.8b02024

Title: In Situ X-ray Scattering Guides the Synthesis of Uniform PtSn Nanocrystals

Journal Article · 29 May 2018 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.8b02024 · OSTI ID:1461328

Wu, Liheng ^[1]; Fournier, Amanda P. ^[2]; Willis, Joshua J. ^[3];

^[3]; Tassone, Christopher J. ^[2]

SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., Stanford, CA (United States)

Compared to monometallic nanocrystals (NCs), bimetallic ones often exhibit superior properties due to their wide tunability in structure and composition. A detailed understanding of their synthesis at the atomic scale provides crucial knowledge for their rational design. Here, exploring the Pt-Sn bimetallic system as an example, we study in detail the synthesis of PtSn NCs using in situ synchrotron X-ray scattering. We show that when Pt(II) and Sn(IV) precursors are used, in contrast to a typical simultaneous reduction mechanism, the PtSn NCs are formed through an initial reduction of Pt(II) to form Pt NCs, followed by the chemical transformation from Pt to PtSn. The kinetics derived from the in situ measurements shows fast diffusion of Sn into the Pt lattice accompanied by re-ordering of these atoms into intermetallic PtSn structure within 300 s at the reaction temperature (~280 oC). This crucial mechanistic understanding enables the synthesis of well-defined PtSn NCs with controlled structure and composition via a seed-mediated approach. Furthermore, this type of in situ characterization can be extended to other multicomponent nanostructures to advance their rational synthesis for practical applications.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1461328

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 6 Vol. 18; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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X-ray scattering
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in situ
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Title: In Situ X-ray Scattering Guides the Synthesis of Uniform PtSn Nanocrystals

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