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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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
OriginalsprogEngelsk
TidsskriftJournal of Mass Spectrometry
Vol/bind37
Udgave nummer7
Sider (fra-til)699-708
Antal sider10
ISSN1076-5174
DOI
StatusUdgivet - 2002
Udgivet eksterntJa

Citer dette

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. I: Journal of Mass Spectrometry. 2002 ; Bind 37, Nr. 7. s. 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",
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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.

I: Journal of Mass Spectrometry, Bind 37, Nr. 7, 2002, s. 699-708.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer 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

U2 - 10.1002/jms.330

DO - 10.1002/jms.330

M3 - Journal article

VL - 37

SP - 699

EP - 708

JO - Journal of Mass Spectrometry

JF - Journal of Mass Spectrometry

SN - 1076-5174

IS - 7

ER -