Resumé
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Journal of Mass Spectrometry |
| Vol/bind | 37 |
| Udgave nummer | 7 |
| Sider (fra-til) | 699-708 |
| Antal sider | 10 |
| ISSN | 1076-5174 |
| DOI | |
| Status | Udgivet - 2002 |
| Udgivet eksternt | Ja |
Citer dette
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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 tidsskrift › Tidsskriftartikel › Forskning › peer 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 -