Adsorption reactions of alkali-halide nanocrystals: Identification of an important surface defect

Margie L. Homer, Frank E. Livingston, Robert L. Whetten

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The adsorption reactions of alkali-halide clusters have been investigated on a size-selected basis using flow-reactor methods. The reactivity of larger sodium-fluoride clusters [NanFn-1]+ toward polar molecules NH3 and H2O shows a distinctive pattern as a function of n at ambient temperature. Comparison with computed structures shows that aparticular kind of defect greatly facilitates the initial adsorption process. This defect can be formed by removal of an ion-pair from the face of an otherwise perfect nanocrystal, to create a basket-like opening for the adsorbed molecule. It is shown that this kind of defect occurs as a most stable low-temperature structure only to a certain size, after which a less reactive defect takes its place. The implications of these findings for the adsorption reactivity of the surfaces of ionic solids are briefly discussed.

Original languageEnglish (US)
Pages (from-to)201-203
Number of pages3
JournalEuropean Physical Journal D
Volume26
Issue number1
DOIs
StatePublished - Mar 1993
Externally publishedYes

Keywords

  • 36.40.+d

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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