Open AccessOxidation‐induced three‐dimensional morphological changes in Ni nanoparticles observed by coherent X‐ray diffraction imaging
Author(s) -
Ahn Kangwoo,
Cho In Hwa,
Kim Junhyung,
Lee Su Yong,
Sung Daeho,
Jung Chulho,
Song Changyong,
Kang Hyon Chol,
Noh Do Young
Publication year - 2021
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577520015945
Subject(s) - materials science , nanoparticle , diffraction , porosity , oxide , nanoscopic scale , void (composites) , catalysis , non blocking i/o , substrate (aquarium) , x ray , chemical engineering , nanotechnology , optics , composite material , chemistry , metallurgy , geology , biochemistry , physics , oceanography , engineering
Three‐dimensional structures of Ni nanoparticles undergoing significant morphological changes on oxidation were observed non‐destructively using coherent X‐ray diffraction imaging. The Ni particles were oxidized into Ni 1 O 1 while forming pores of various sizes internally. For each Ni nanoparticle, one large void was identified at a lower corner near the interface with the substrate. The porosity of the internal region of the agglomerated Ni oxide was about 38.4%. Regions of high NiO density were mostly observed at the outer crust of the oxide or at the boundary with the large voids. This research expands our understanding of general catalytic reactions with direct observation of oxidation‐induced nanoscale morphological changes.