skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Reduced graphene oxide as a filament material for thermal ionization mass spectrometry

Abstract

Isotopic information can be informative as to the intended use and/or production history of special nuclear material. For uranium and plutonium samples, thermal ionization mass spectrometry (TIMS) is the benchmark technique for determining isotope ratio data. Sample utilization in thermal ionization, however, is low with typical ionization efficiencies between 0.1% and 0.5% - i.e., only 0.1% to 0.5% of the sample contributes to the detected signal. One barrier to improving the ionization efficiency is thermodynamic limits related to the work function of the ionization filament. Graphene oxide, having a tunable work function, has the potential to greatly improve ionization efficiencies over Re or W-based filaments. The bulk work function of graphene can be tuned through doping or incorporating metal particulates in the graphene oxide matrix. In the first year of this LDRD project reduced graphene oxide (RGO) filaments were constructed using 3D printing techniques and mated to commercial filament posts. The second year of this LDRD produced ultra-low U background RGO filaments and RGO-composite filaments that are more robust than Re filaments at high temperatures and high vacuum conditions. Preliminary results using a commercial TIMS instrument demonstrate a 500 % ionization enhancement for Uranium when using Re-RGO composite-based filaments overmore » traditional Re filaments when direct loading sample solutions onto filaments.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Savannah River National Lab (SRNL), Aiken, SC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1475282
Report Number(s):
SRNL-STI-2018-00549
TRN: US1902616
DOE Contract Number:  
AC09-08SR22470
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Mannion, J. M., Achey, R. M., Hewitt, J. H., Shick, Jr., C. R., and Siegfried, M. J. Reduced graphene oxide as a filament material for thermal ionization mass spectrometry. United States: N. p., 2018. Web. doi:10.2172/1475282.
Mannion, J. M., Achey, R. M., Hewitt, J. H., Shick, Jr., C. R., & Siegfried, M. J. Reduced graphene oxide as a filament material for thermal ionization mass spectrometry. United States. doi:10.2172/1475282.
Mannion, J. M., Achey, R. M., Hewitt, J. H., Shick, Jr., C. R., and Siegfried, M. J. Fri . "Reduced graphene oxide as a filament material for thermal ionization mass spectrometry". United States. doi:10.2172/1475282. https://www.osti.gov/servlets/purl/1475282.
@article{osti_1475282,
title = {Reduced graphene oxide as a filament material for thermal ionization mass spectrometry},
author = {Mannion, J. M. and Achey, R. M. and Hewitt, J. H. and Shick, Jr., C. R. and Siegfried, M. J.},
abstractNote = {Isotopic information can be informative as to the intended use and/or production history of special nuclear material. For uranium and plutonium samples, thermal ionization mass spectrometry (TIMS) is the benchmark technique for determining isotope ratio data. Sample utilization in thermal ionization, however, is low with typical ionization efficiencies between 0.1% and 0.5% - i.e., only 0.1% to 0.5% of the sample contributes to the detected signal. One barrier to improving the ionization efficiency is thermodynamic limits related to the work function of the ionization filament. Graphene oxide, having a tunable work function, has the potential to greatly improve ionization efficiencies over Re or W-based filaments. The bulk work function of graphene can be tuned through doping or incorporating metal particulates in the graphene oxide matrix. In the first year of this LDRD project reduced graphene oxide (RGO) filaments were constructed using 3D printing techniques and mated to commercial filament posts. The second year of this LDRD produced ultra-low U background RGO filaments and RGO-composite filaments that are more robust than Re filaments at high temperatures and high vacuum conditions. Preliminary results using a commercial TIMS instrument demonstrate a 500 % ionization enhancement for Uranium when using Re-RGO composite-based filaments over traditional Re filaments when direct loading sample solutions onto filaments.},
doi = {10.2172/1475282},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {9}
}

Technical Report:

Save / Share: