Role of the surface chemistry of ceria surfaces on silicate adsorption

Jihoon Seo, Jung Woo Lee, Jinok Moon, Wolfgang Sigmund, Ungyu Paik

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Ceria nanoparticles (NPs) have been widely explored as a promising material in various fields. As synthesized under various physicochemical conditions, it exhibits the different surface chemistry. Here, the role of hydroxyl and nitrate group on ceria surface, formed under various physicochemical conditions, for the silicate adsorption was experimentally and theoretically investigated based on the adsorption isotherms and theoretical analyses using density functional theory (DFT) calculation. Experimental results acquired from adsorption isotherms with Freundlich model indicated that the nitrate group shows a much higher affinity with silicate than the hydroxyl groups. These phenomena were demonstrated through the theoretical approaches that exhibit the binding energy of the NO3-ceria (-4.383 eV) on the SiO2 surface being much higher than that of the OH-ceria (-3.813 eV). In good agreement with the experimental and the theoretical results based on adsorption properties, the results of chemical mechanical planarization (CMP) also show that the nitrate groups significantly enhance the removal of SiO2 than the hydroxyl groups. The results investigated in this study will provide researchers, studying the ceria NPs, with guidelines on the importance of exploring the surface chemistry of ceria.

Original languageEnglish
Pages (from-to)7388-7394
Number of pages7
JournalACS Applied Materials and Interfaces
Volume6
Issue number10
DOIs
StatePublished - 2014 May 28

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Silicates
Cerium compounds
Surface chemistry
Adsorption
Hydroxyl Radical
Nitrates
Adsorption isotherms
Nanoparticles
Chemical mechanical polishing
Binding energy
Density functional theory

Keywords

  • CMP
  • DFT
  • adsorption isotherm
  • calculation
  • ceria
  • surface chemistry

Cite this

Seo, Jihoon ; Lee, Jung Woo ; Moon, Jinok ; Sigmund, Wolfgang ; Paik, Ungyu. / Role of the surface chemistry of ceria surfaces on silicate adsorption. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 10. pp. 7388-7394.
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Role of the surface chemistry of ceria surfaces on silicate adsorption. / Seo, Jihoon; Lee, Jung Woo; Moon, Jinok; Sigmund, Wolfgang; Paik, Ungyu.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 10, 28.05.2014, p. 7388-7394.

Research output: Contribution to journalArticle

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