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Ki, Ho Sung
나노물질 및 화학반응 연구단
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Gold nanoparticle formation via x-ray radiolysis investigated with time-resolved x-ray liquidography

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Title
Gold nanoparticle formation via x-ray radiolysis investigated with time-resolved x-ray liquidography
Author(s)
Hosung Ki; Sungjun Park; Seunghwan Eom; Jain Gu; Siin Kim; Changwon Kim; Chi Woo Ahn; Minseo Choi; Sena Ahn; Doo-Sik Ahn; Jungkweon Choi; Mu-Hyun Baik; Hyotcherl Ihee
Subject
Gold nanoparticle, ; Laser ablation, ; Time-resolved X-ray liquidography, ; X-ray radiolysis
Publication Date
2020-10
Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, v.21, no.19, pp.7125
Publisher
MDPI AG
Abstract
© 2020 by the authors. We report the generation of gold nanoparticles (AuNPs) from the aqueous solution of chloro(2,2′,2′′-terpyridine)gold(III) ion ([Au(tpy)Cl]2+ ) through X-ray radiolysis and optical excitation at a synchrotron. The original purpose of the experiment was to investigate the photoinduced structural changes of [Au(tpy)Cl]2+ upon 400 nm excitation using time-resolved X-ray liquidography (TRXL). Initially, the TRXL data did not show any signal that would suggest structural changes of the solute molecule, but after an induction time, the TRXL data started to show sharp peaks and valleys. In the early phase, AuNPs with two types of morphology, dendrites, and spheres, were formed by the reducing action of hydrated electrons generated by the X-ray radiolysis of water, thereby allowing the detection of TRXL data due to the laser-induced lattice expansion and relaxation of AuNPs. Along with the lattice expansion, the dendritic and spherical AuNPs were transformed into smaller, raspberry-shaped AuNPs of a relatively uniform size via ablation by the optical femtosecond laser pulse used for the TRXL experiment. Density functional theory calculations confirm that the reduction potential of the metal complex relative to the hydration potential of X-ray-generated electrons determines the facile AuNP formation observed for [Au(tpy)Cl]2+
URI
https://pr.ibs.re.kr/handle/8788114/7596
DOI
10.3390/ijms21197125
ISSN
1661-6596
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
Center for Catalytic Hydrocarbon Functionalizations(분자활성 촉매반응 연구단) > 1. Journal Papers (저널논문)
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