4.8 Article

Chemical Patterns from Surface Grafted Resists for Directed Assembly of Block Copolymers

期刊

ACS NANO
卷 6, 期 2, 页码 1823-1829

出版社

AMER CHEMICAL SOC
DOI: 10.1021/nn204995z

关键词

block copolymer; brush; directed assembly; preferential surface; e-beam patterning

资金

  1. Center for Nanotechnology
  2. Synchrotron Radiation Center at the University of Wisconsin (National Science Foundation) [DMR-0537588]
  3. National Science Foundation-Nanoscale Science and Engineering Center at the University of Wisconsin-Madison [DMR-0832760]
  4. Division Of Materials Research
  5. Direct For Mathematical & Physical Scien [832760] Funding Source: National Science Foundation

向作者/读者索取更多资源

We demonstrate a direct e-beam patternable one-component block copolymer (BC?) resist to fabricate a chemical pattern for the directed assembly of a symmetric block copolymer. The resist consists of a low molecular weight poly(styrene-block-methyl methacrylate) with a hydroxyl group at the PMMA chain end (PS-b-PMMA-OH), which anchors the chains to the surface. This short-tethered PMMA block provided sufficient sensitivity to allow scission by e-beam. The length of the untethered PS block was fine-tuned to impart the required contrast between the patterned and the unpatterned region for 1:1 assembly of an overlying Be blend. Two BC? resists with a PS fraction of 025 (16SM) and 034 (18SM), with a total molecular weight less than 20K, were synthesized, and the assembly of a ternary BCP blend was studied. 16SM- and 18SM-anchored substrates showed nonpreferential and PS preferential surfaces, respectively. Both 18SM and 16SM could be patterned by e-beam to fabricate a 1:1 chemical pattern with a line pitch of 70 nm for the assembly of a BCP ternary blend. 18SM gave fewer defects than 16SM due to an increased contrast in interfacial energies between adjacent stripes in the chemical surface pattern. Two additional PS-b-PMMA-OH polymers with a molecular weight of 39K (F-PS = 0.76) and 69K (F-PS = 0.83) were synthesized to study the effect of PS cross-linking upon exposure to e-beam. As the PS fraction increases, the line pattern becomes blurred and ultimately ineffective in guiding the BC? assembly. The blurring is attributed to cross-linking of adjacent PS chains.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据