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On formation mechanism of Pd–Ir bimetallic nanoparticles through thermal decomposition of [Pd(NH3)4][IrCl6]

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Abstract

The formation mechanism of Pd–Ir nanoparticles during thermal decomposition of double complex salt [Pd(NH3)4][IrCl6] has been studied by in situ X-ray absorption (XAFS) and photoelectron (XPS) spectroscopies. The changes in the structure of the Pd and Ir closest to the surroundings and chemical states of Pd, Ir, Cl, and N atoms were traced in the range from room temperature to 420 °C in inert atmosphere. It was established that the thermal decomposition process is carried out in 5 steps. The Pd–Ir nanoparticles are formed in pyramidal/rounded Pd-rich (10–200 nm) and dendrite Ir-rich (10–50 nm) solid solutions. A d charge depletion at Ir site and a gain at Pd, as well as the intra-atomic charge redistribution between the outer d and s and p electrons of both Ir and Pd in Pd–Ir nanoparticles, were found to occur.

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Acknowledgments

The authors would like to thank the Russian Foundation for Basic Research, Grant No. 12-02-00354-a, for financial support and A. Shchukarev for XPS measurements.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry SB RAS, 630090, Novosibirsk, Russia

    Tatyana I. Asanova, Igor P. Asanov, Andrey V. Zadesenets, Pavel E. Plyusnin & Sergey V. Korenev

  2. Beamline Research Division, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Min-Gyu Kim

  3. Boreskov Institute of Catalysis SB RAS, Novosibirsk, 630090, Russia

    Evgeny Yu. Gerasimov

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  1. Tatyana I. Asanova
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  2. Igor P. Asanov
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  3. Min-Gyu Kim
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  4. Evgeny Yu. Gerasimov
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Correspondence to Tatyana I. Asanova.

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Asanova, T.I., Asanov, I.P., Kim, MG. et al. On formation mechanism of Pd–Ir bimetallic nanoparticles through thermal decomposition of [Pd(NH3)4][IrCl6]. J Nanopart Res 15, 1994 (2013). https://doi.org/10.1007/s11051-013-1994-6

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