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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1107/S1600577518008184
|2 doi
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|a pubmed24n0960.xml
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Wu, Tai Sing
|e verfasserin
|4 aut
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| 245 |
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|a Defect engineering by synchrotron radiation X-rays in CeO2 nanocrystals
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 06.09.2018
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|a Date Revised 06.09.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a This work reports an unconventional defect engineering approach using synchrotron-radiation-based X-rays on ceria nanocrystal catalysts of particle sizes 4.4-10.6 nm. The generation of a large number of oxygen-vacancy defects (OVDs), and therefore an effective reduction of cations, has been found in CeO2 catalytic materials bombarded by high-intensity synchrotron X-ray beams of beam size 1.5 mm × 0.5 mm, photon energies of 5.5-7.8 keV and photon fluxes up to 1.53 × 1012 photons s-1. The experimentally observed cation reduction was theoretically explained by a first-principles formation-energy calculation for oxygen vacancy defects. The results clearly indicate that OVD formation is mainly a result of X-ray-excited core holes that give rise to valence holes through electron down conversion in the material. Thermal annealing and subvalent Y-doping were also employed to modulate the efficiency of oxygen escape, providing extra control on the X-ray-induced OVD generating process. Both the core-hole-dominated bond breaking and oxygen escape mechanisms play pivotal roles for efficient OVD formation. This X-ray irradiation approach, as an alternative defect engineering method, can be applied to a wide variety of nanostructured materials for physical-property modification
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|a Journal Article
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|a DFT
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|a X-ray irradiation
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|a XANES
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|a defect engineering
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1 |
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|a Syu, Leng You
|e verfasserin
|4 aut
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1 |
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|a Weng, Shih Chang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jeng, Horng Tay
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chang, Shih Lin
|e verfasserin
|4 aut
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|a Soo, Yun Liang
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1994
|g 25(2018), Pt 5 vom: 01. Sept., Seite 1395-1399
|w (DE-627)NLM09824129X
|x 1600-5775
|7 nnns
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| 773 |
1 |
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|g volume:25
|g year:2018
|g number:Pt 5
|g day:01
|g month:09
|g pages:1395-1399
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|u http://dx.doi.org/10.1107/S1600577518008184
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