Atmospheric pressure ionization mass spectroscopy for the study of permeation in polymeric tubing

Ce Ma, Asad M. Haider, Farhang Shadman

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Polymeric tubes are used in the semiconductor manufacturing industry to provide mechanical flexibility and electrical insulation. Since polymeric tubing has higher permeation rate compared to metal tubing, it can easily become a source of contamination in ultrapure gas distribution and delivery systems. In this study, an Atmospheric Pressure Ionization Mass Spectrometer (APIMS) is used to determine the permeation coefficients for two widely used polymeric tubing, PFA and Kel-F (PCTFE), at 25°C and 75°C. In the experiments, an ultra-high purity N2 gas flow was maintained through the test tubing. The net impurity uptake by nitrogen due to the permeation of O2, CO2, H2O, and CH4 from surrounding air into the polymeric tubing was measured by APIMS with sub-ppb sensitivities. CH4 had the highest and O2 had the lowest permeation coefficients. Results showed that Kel-F was a superior barrier material for all impurities studied. The permeation coefficients for these polymers increased with temperature but did not change significantly with the permeant partial pressure. Permeability of PFA showed a stronger temperature dependence than that of Kel-F.

Original languageEnglish (US)
Pages (from-to)361-366
Number of pages6
JournalIEEE Transactions on Semiconductor Manufacturing
Volume6
Issue number4
DOIs
StatePublished - Nov 1993

Fingerprint

Tubing
Permeation
Atmospheric pressure
Ionization
atmospheric pressure
mass spectroscopy
Spectroscopy
ionization
Mass spectrometers
mass spectrometers
coefficients
Impurities
electrical insulation
impurities
insulation
Partial pressure
gas flow
partial pressure
Flow of gases
Insulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering
  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics

Cite this

Atmospheric pressure ionization mass spectroscopy for the study of permeation in polymeric tubing. / Ma, Ce; Haider, Asad M.; Shadman, Farhang.

In: IEEE Transactions on Semiconductor Manufacturing, Vol. 6, No. 4, 11.1993, p. 361-366.

Research output: Contribution to journalArticle

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