Characterization of core-shell MOF particles by depth profiling experiments using on-line single particle mass spectrometry

TitleCharacterization of core-shell MOF particles by depth profiling experiments using on-line single particle mass spectrometry
Publication TypeJournal Article
Year of Publication2015
AuthorsCahill JF, Fei H., Cohen SM, Prather KA
JournalAnalyst
Volume140
Pagination1510-1515
Date Published2015/03
Type of ArticleArticle
ISBN Number0003-2654
Accession NumberWOS:000349837200018
Keywordsammonium; coordination polymer crystals; desorption/ionization; fabrication; functionalization; ligand; metal-organic frameworks; morphology; nanoparticles; nanoscale; postsynthetic
Abstract

Materials with core-shell structures have distinct properties that lend themselves to a variety of potential applications. Characterization of small particle core-shell materials presents a unique analytical challenge. Herein, single particles of solid-state materials with core-shell structures were measured using on-line aerosol time-of-flight mass spectrometry (ATOFMS). Laser 'depth profiling' experiments verified the core-shell nature of two known core-shell particle configurations (< 2 mu m diameter) that possessed inverted, complimentary core-shell compositions (ZrO2@SiO2 versus SiO2@ZrO2). The average peak area ratios of Si and Zr ions were calculated to definitively show their core-shell composition. These ratio curves acted as a calibrant for an uncharacterized sample - a metal-organic framework (MOF) material surround by silica (UiO-66(Zr)@SiO2; UiO = University of Oslo). ATOFMS depth profiling was used to show that these particles did indeed exhibit a core-shell architecture. The results presented here show that ATOFMS can provide unique insights into core-shell solid-state materials with particle diameters between 0.2-3 mu m.

DOI10.1039/c4an01913j
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