Rationalization of the X-ray photoelectron spectroscopy of aluminium phosphates synthesized from different precursors

Victoria Bemmer, Michael Bowker, James H. Carter, Philip R. Davies*, Lee E. Edwards, Kenneth D.M. Harris, Colan E. Hughes, Fiona Robinson, David J. Morgan, Matthew G. Thomas

*Corresponding author for this work

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Abstract

The aim of this paper is to clarify the assignments of X-ray photoelectron spectra of aluminium phosphate materials prepared from the reaction of phosphoric acid with three different aluminium precursors [Al(OH)3, Al(NO3)3 and AlCl3] at different annealing temperatures. The materials prepared have been studied by X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), infrared spectroscopy and high-resolution solid-state 31P NMR spectroscopy. A progressive polymerization from orthophosphate to metaphosphates is observed by XRD, ATR-FTIR and solid state 31P NMR, and on this basis the oxygen states observed in the XP spectra at 532.3 eV and 533.7 eV are assigned to P-O-Al and P-O-P environments, respectively. The presence of cyclic polyphosphates at the surface of the samples is also evident.

Original languageEnglish
Pages (from-to)8444-8452
Number of pages9
JournalRSC Advances
Volume10
Issue number14
DOIs
Publication statusPublished - 26 Feb 2020
Externally publishedYes

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