Trimethylphosphine-Assisted Surface Fingerprinting of Metal Oxide Nanoparticle by 31P Solid-State NMR : A Zinc Oxide Case Study

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lin Ye
  • Jin Qu
  • Li Zhang
  • Yingyi Fu
  • Ivo F. Teixeira
  • Ian James McPherson
  • Heyong He
  • Shik Chi Edman Tsang

Detail(s)

Original languageEnglish
Pages (from-to)2225-2234
Journal / PublicationJournal of the American Chemical Society
Volume138
Issue number7
Online published26 Jan 2016
Publication statusPublished - 24 Feb 2016
Externally publishedYes

Abstract

Nano metal oxides are becoming widely used in industrial, commercial and personal products (semiconductors, optics, solar cells, catalysts, paints, cosmetics, sun-cream lotions, etc.). However, the relationship of surface features (exposed planes, defects and chemical functionalities) with physiochemical properties is not well studied primarily due to lack of a simple technique for their characterization. In this study, solid state 31P MAS NMR is used to map surfaces on various ZnO samples with the assistance of trimethylphosphine (TMP) as a chemical probe. As similar to XRD giving structural information on a crystal, it is demonstrated that this new surface-fingerprint technique not only provides qualitative (chemical shift) but also quantitative (peak intensity) information on the concentration and distribution of cations and anions, oxygen vacancies and hydroxyl groups on various facets from a single deconvoluted 31P NMR spectrum. On the basis of this technique, a new mechanism for photocatalytic OH radical generation from direct surface-OH oxidation is revealed, which has important implications regarding the safety of using nano oxides in personal care products.

Citation Format(s)

Trimethylphosphine-Assisted Surface Fingerprinting of Metal Oxide Nanoparticle by 31P Solid-State NMR : A Zinc Oxide Case Study. / Peng, Yung-Kang; Ye, Lin; Qu, Jin et al.

In: Journal of the American Chemical Society, Vol. 138, No. 7, 24.02.2016, p. 2225-2234.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review