NDLI: Patterning nanocluster polystyrene brushes grafted from initiator cores on silicon surfaces by lithography processing

Content Provider	Springer Nature Link
Author	Chen, Jem Kun Zhuang, Ai Ling
Copyright Year	2011
Abstract	In this study, we formed grafted polystyrene (PS) brushes possessing nanocluster structures through atom transfer radical polymerization from initiator cores presented on Si surfaces that had been generated using reactive ion etching (RIE). We established the surface grafting polymerization kinetics of the nanoclustered PS chains on the Si surfaces to fit their experimentally determined thickness (ellipsometry) and number-average molecular weight (M n) of “free” PS (gel permeation chromatography). The propagation rate (k p) and active grafting species deactivation rate (k d) were obtained from reactions involving styrene concentrations from 0.2 to 2 M. We also used scanning electron microscopy to observe the morphologies of the PS grafted to the surfaces after various reaction times at various styrene concentrations. The PS brushes grafted onto the Si surfaces under styrene concentrations of 0.2, 0.5, 1, and 2 M exhibited clustered structures having cluster diameters of 12, 28, 42, and 45 nm, respectively; from these observations, we calculated the critical grafting density. In addition, we generated highly dense, well-defined patterns of PS on patterned Si(100) surfaces through the use of a very-large-scale integration process involving electron beam lithography and RIE. We employed the RIE system to generate a high density of reactive species at the bottom of the trenches for graft polymerization. After 21 h of grafting, AFM imaging revealed dense line patterns of nanoclustered PS.
Starting Page	1283
Ending Page	1294
Page Count	12
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	289
Issue Number	11
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanocluster Polystyrene Lithography Characterization and Evaluation of Materials Soft and Granular Matter, Complex Fluids and Microfluidics Food Science Physical Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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