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

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of California, La Jolla, CA (United States)
  3. Univ. of California, La Jolla, CA (United States); Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Analyst
Additional Journal Information:
Journal Volume: 140; Journal Issue: 5; Journal ID: ISSN 0003-2654
Publisher:
Royal Society of Chemistry
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1347311

Cahill, J. F., Fei, H., Cohen, S. M., and Prather, K. A.. Characterization of core–shell MOF particles by depth profiling experiments using on-line single particle mass spectrometry. United States: N. p., Web. doi:10.1039/C4AN01913J.
Cahill, J. F., Fei, H., Cohen, S. M., & Prather, K. A.. Characterization of core–shell MOF particles by depth profiling experiments using on-line single particle mass spectrometry. United States. doi:10.1039/C4AN01913J.
Cahill, J. F., Fei, H., Cohen, S. M., and Prather, K. A.. 2015. "Characterization of core–shell MOF particles by depth profiling experiments using on-line single particle mass spectrometry". United States. doi:10.1039/C4AN01913J. https://www.osti.gov/servlets/purl/1347311.
@article{osti_1347311,
title = {Characterization of core–shell MOF particles by depth profiling experiments using on-line single particle mass spectrometry},
author = {Cahill, J. F. and Fei, H. and Cohen, S. M. and Prather, K. A.},
abstractNote = {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.},
doi = {10.1039/C4AN01913J},
journal = {Analyst},
number = 5,
volume = 140,
place = {United States},
year = {2015},
month = {1}
}

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