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In Situ Time-Resolved XAFS Studies on Laser-Induced Particle Formation of Platinum Groups Metal Ions in a H$$_{2}$$O / EtOH Solution

Saeki, Morihisa*; Matsumura, Daiju  ; Yomogida, Takumi  ; Taguchi, Tomitsugu*; Tsuji, Takuya ; Saito, Hiroyuki*; Nakanishi, Ryuzo*; Oba, Hironori*

When nanosecond pulsed UV laser is irradiated into a H$$_{2}$$O / EtOH solution of platinum group metal (PGM) ions, PGM particles with sub-micron size are formed. We investigated laser induced particle formation of Pd$$^{2+}$$ in the H$$_{2}$$O / EtOH solution by in situ time-resolved XAFS spectroscopy and showed dependence of the reaction rate of laser-induced particle formation on the laser fluence. The dependence on the laser fluence elucidated that the photons contribute not only to the reduction of the Pd$$^{2+}$$, but also to the autocatalytic growth of the Pd particles.



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