Quantification of grafted poly(ethylene glycol)​-​silanes on silicon by time-​of-​flight secondary ion mass spectrometry

Fadhil S. Kamounah, K. Norrman , A Papra, N. Gadegaard, N.B. Larsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Silicon grafted monodisperse poly(ethylene glycol) (PEG) silanes with various PEG chain lengths and mixtures of these were systematically analyzed with static time-of-flight secondary ion mass spectrometry (TOF-SIMS). The mass spectra show differences in the various relative signal intensities, an observation that was used to elucidate important aspects of the grafting process. The relationship between PEG-silane fragment ion abundances and Si+ ion abundances were used to (i) qualitatively describe layer thicknesses of grafted mixtures of PEG-silanes on silicon, (ii) construct a calibration curve from which PEG chain length (or molecular mass) can be determined and (iii) quantitatively determine surface mixture compositions of grafted monodisperse PEG-silanes of different chain lengths (3, 7 and 11 PEG units). The results suggest that discrimination does take place in the adsorption process. The PEG-silane with the shorter PEG chain is discriminated for mixtures containing PEG3-silane, whereas the PEG-silane with the longer PEG chain is discriminated in PEG7/PEG11-silane mixtures. The origin of this difference in adsorption behavior is not well understood. Aspects of the grafting process and the TOF-SIMS analyses are discussed
Original languageEnglish
JournalJournal of Mass Spectrometry
Volume37
Issue number7
Pages (from-to)699-708
Number of pages10
ISSN1076-5174
DOIs
Publication statusPublished - 2002
Externally publishedYes

Cite this

Kamounah, Fadhil S. ; Norrman , K. ; Papra, A ; Gadegaard, N. ; Larsen, N.B. / Quantification of grafted poly(ethylene glycol)​-​silanes on silicon by time-​of-​flight secondary ion mass spectrometry. In: Journal of Mass Spectrometry. 2002 ; Vol. 37, No. 7. pp. 699-708.
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title = "Quantification of grafted poly(ethylene glycol)​-​silanes on silicon by time-​of-​flight secondary ion mass spectrometry",
abstract = "Silicon grafted monodisperse poly(ethylene glycol) (PEG) silanes with various PEG chain lengths and mixtures of these were systematically analyzed with static time-of-flight secondary ion mass spectrometry (TOF-SIMS). The mass spectra show differences in the various relative signal intensities, an observation that was used to elucidate important aspects of the grafting process. The relationship between PEG-silane fragment ion abundances and Si+ ion abundances were used to (i) qualitatively describe layer thicknesses of grafted mixtures of PEG-silanes on silicon, (ii) construct a calibration curve from which PEG chain length (or molecular mass) can be determined and (iii) quantitatively determine surface mixture compositions of grafted monodisperse PEG-silanes of different chain lengths (3, 7 and 11 PEG units). The results suggest that discrimination does take place in the adsorption process. The PEG-silane with the shorter PEG chain is discriminated for mixtures containing PEG3-silane, whereas the PEG-silane with the longer PEG chain is discriminated in PEG7/PEG11-silane mixtures. The origin of this difference in adsorption behavior is not well understood. Aspects of the grafting process and the TOF-SIMS analyses are discussed",
author = "Kamounah, {Fadhil S.} and K. Norrman and A Papra and N. Gadegaard and N.B. Larsen",
year = "2002",
doi = "10.1002/jms.330",
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journal = "Journal of Mass Spectrometry",
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Quantification of grafted poly(ethylene glycol)​-​silanes on silicon by time-​of-​flight secondary ion mass spectrometry. / Kamounah, Fadhil S.; Norrman , K.; Papra, A; Gadegaard, N.; Larsen, N.B.

In: Journal of Mass Spectrometry, Vol. 37, No. 7, 2002, p. 699-708.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Quantification of grafted poly(ethylene glycol)​-​silanes on silicon by time-​of-​flight secondary ion mass spectrometry

AU - Kamounah, Fadhil S.

AU - Norrman , K.

AU - Papra, A

AU - Gadegaard, N.

AU - Larsen, N.B.

PY - 2002

Y1 - 2002

N2 - Silicon grafted monodisperse poly(ethylene glycol) (PEG) silanes with various PEG chain lengths and mixtures of these were systematically analyzed with static time-of-flight secondary ion mass spectrometry (TOF-SIMS). The mass spectra show differences in the various relative signal intensities, an observation that was used to elucidate important aspects of the grafting process. The relationship between PEG-silane fragment ion abundances and Si+ ion abundances were used to (i) qualitatively describe layer thicknesses of grafted mixtures of PEG-silanes on silicon, (ii) construct a calibration curve from which PEG chain length (or molecular mass) can be determined and (iii) quantitatively determine surface mixture compositions of grafted monodisperse PEG-silanes of different chain lengths (3, 7 and 11 PEG units). The results suggest that discrimination does take place in the adsorption process. The PEG-silane with the shorter PEG chain is discriminated for mixtures containing PEG3-silane, whereas the PEG-silane with the longer PEG chain is discriminated in PEG7/PEG11-silane mixtures. The origin of this difference in adsorption behavior is not well understood. Aspects of the grafting process and the TOF-SIMS analyses are discussed

AB - Silicon grafted monodisperse poly(ethylene glycol) (PEG) silanes with various PEG chain lengths and mixtures of these were systematically analyzed with static time-of-flight secondary ion mass spectrometry (TOF-SIMS). The mass spectra show differences in the various relative signal intensities, an observation that was used to elucidate important aspects of the grafting process. The relationship between PEG-silane fragment ion abundances and Si+ ion abundances were used to (i) qualitatively describe layer thicknesses of grafted mixtures of PEG-silanes on silicon, (ii) construct a calibration curve from which PEG chain length (or molecular mass) can be determined and (iii) quantitatively determine surface mixture compositions of grafted monodisperse PEG-silanes of different chain lengths (3, 7 and 11 PEG units). The results suggest that discrimination does take place in the adsorption process. The PEG-silane with the shorter PEG chain is discriminated for mixtures containing PEG3-silane, whereas the PEG-silane with the longer PEG chain is discriminated in PEG7/PEG11-silane mixtures. The origin of this difference in adsorption behavior is not well understood. Aspects of the grafting process and the TOF-SIMS analyses are discussed

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