Grafting of high-density poly(ethylene glycol) monolayers on Si(111)

X. Y. Zhu, Yongseok Jun, D. R. Staarup, R. C. Major, S. Danielson, V. Boiadjiev, W. L. Gladfelter, B. C. Bunker, A. Guo

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

A strategy has been developed for the grafting of poly(ethylene glycol) (PEG) monolayers onto the atomically flat Si(111) surface. This process involves the direct interaction of the HO-functional group on PEG with a chlorine-terminated silicon surface. The resulting monolayers show exceptional flatness, with mean roughness on the angstrom scale. Film thickness is determined by ellipsometry, X-ray photoelectron spectroscopy, and atomic force microscopy. Results for different molecular weights reveal that the grafted PEG molecules are in a brushlike configuration at low molecular weight (MW = 200, 300) and a more coil-like configuration at higher molecular weight (MW = 1000, 2000). The surface density of grafted PEG molecules is significantly higher than those reported in the literature and decreases with increasing molecular weight, from 92% at MW = 300 to 35% at MW = 2000. Both the brushlike and the coil-like configurations show excellent properties of protein resistance.

Original languageEnglish
Pages (from-to)7798-7803
Number of pages6
JournalLangmuir
Volume17
Issue number25
DOIs
Publication statusPublished - 2001 Dec 11
Externally publishedYes

Fingerprint

Ethylene Glycol
Polyethylene glycols
glycols
Monolayers
molecular weight
ethylene
Molecular Weight
Molecular weight
coils
configurations
flatness
low molecular weights
Photoelectron Spectroscopy
ellipsometry
chlorine
molecules
Atomic Force Microscopy
Chlorine
Silicon
film thickness

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Zhu, X. Y., Jun, Y., Staarup, D. R., Major, R. C., Danielson, S., Boiadjiev, V., ... Guo, A. (2001). Grafting of high-density poly(ethylene glycol) monolayers on Si(111). Langmuir, 17(25), 7798-7803. https://doi.org/10.1021/la010672i

Grafting of high-density poly(ethylene glycol) monolayers on Si(111). / Zhu, X. Y.; Jun, Yongseok; Staarup, D. R.; Major, R. C.; Danielson, S.; Boiadjiev, V.; Gladfelter, W. L.; Bunker, B. C.; Guo, A.

In: Langmuir, Vol. 17, No. 25, 11.12.2001, p. 7798-7803.

Research output: Contribution to journalArticle

Zhu, XY, Jun, Y, Staarup, DR, Major, RC, Danielson, S, Boiadjiev, V, Gladfelter, WL, Bunker, BC & Guo, A 2001, 'Grafting of high-density poly(ethylene glycol) monolayers on Si(111)', Langmuir, vol. 17, no. 25, pp. 7798-7803. https://doi.org/10.1021/la010672i
Zhu XY, Jun Y, Staarup DR, Major RC, Danielson S, Boiadjiev V et al. Grafting of high-density poly(ethylene glycol) monolayers on Si(111). Langmuir. 2001 Dec 11;17(25):7798-7803. https://doi.org/10.1021/la010672i
Zhu, X. Y. ; Jun, Yongseok ; Staarup, D. R. ; Major, R. C. ; Danielson, S. ; Boiadjiev, V. ; Gladfelter, W. L. ; Bunker, B. C. ; Guo, A. / Grafting of high-density poly(ethylene glycol) monolayers on Si(111). In: Langmuir. 2001 ; Vol. 17, No. 25. pp. 7798-7803.
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