Journal ArticleDOI
Microdomain orientation control of PS-b-PMMA films enabled by wettability relay of graphene
Mei-Ling Wu,Dong Wang +1 more
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TLDR
In this article, the orientation control of block copolymer (BCP) microdomains in thin thin films is addressed by using monolayer graphene to physically separate a neutral random copolymers layer and a BCP film, and relay the wettability of the neutral interface to achieve a perpendicularly oriented control of self-assembly of PS-b-PMMA microdomain.Abstract:
Orientation control of block copolymer (BCP) microdomains in thin films is an important step for robust pattern transfer in BCP-based nanolithography. The established orientation control of BCP films relies on neutral surface modification using a random copolymer brush covalently bonded to substrates with proper anchoring groups, which is limited to specific substrates. Herein, we reported the utilization of monolayer graphene to physically separate a neutral random copolymer layer and a BCP film, and at the same time, relay the wettability of the neutral interface to achieve a perpendicularly oriented control of self-assembly of PS-b-PMMA microdomains. We demonstrate that the method is widely applicable to achieve the orientation control of the BCP film on various substrates.read more
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Large area fabrication of graphene nanoribbons by wetting transparency-assisted block copolymer lithography
Reika Katsumata,Maruthi N. Yogeesh,Helen Wong,Sunshine X. Zhou,Stephen M. Sirard,Tao Huang,Richard D. Piner,Zilong Wu,Wei Li,Alvin L. Lee,Matthew C. Carlson,Michael J. Maher,Deji Akinwande,Christopher J. Ellison +13 more
TL;DR: In this article, a GNR fabrication method using block copolymer (BCP) lithography that takes advantage of the wetting transparency of graphene was developed, where the self-assembled domains of the polystyrene-block -poly(methyl methacrylate) BCP are oriented perpendicularly directly on top of the graphene where they can later serve as an etch mask.
References
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Journal ArticleDOI
Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
Journal ArticleDOI
Large-scale pattern growth of graphene films for stretchable transparent electrodes
Keun Soo Kim,Yue Zhao,Houk Jang,Sang Yoon Lee,Jong Min Kim,Kwang S. Kim,Jong Hyun Ahn,Philip Kim,Philip Kim,Jae-Young Choi,Byung Hee Hong +10 more
TL;DR: The direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers is reported, and two different methods of patterning the films and transferring them to arbitrary substrates are presented, implying that the quality of graphene grown by chemical vapours is as high as mechanically cleaved graphene.
Journal ArticleDOI
Block copolymer lithography: Periodic arrays of ~1011 holes in 1 square centimeter
TL;DR: In this paper, dense periodic arrays of holes and dots have been fabricated in a silicon nitride-coated silicon wafer and transferred directly to the underlying silicon oxide layer by two complementary techniques.
Journal ArticleDOI
Controlling Polymer-Surface Interactions with Random Copolymer Brushes
TL;DR: In this article, a simple technique for precisely controlling the interfacial energies and wetting behavior of polymers in contact with solid surfaces is described, where end-functionalized statistical random copolymers of styrene and methylmethacrylate are synthesized, with the styrene fraction f varying from 0 to 1, and were end-grafted onto silicon substrates to create random polymers about 5 nanometers thick.
Journal ArticleDOI
Wetting transparency of graphene
J. Rafiee,Xi Mi,Hemtej Gullapalli,Abhay V. Thomas,Fazel Yavari,Yunfeng Shi,Pulickel M. Ajayan,Nikhil Koratkar +7 more
TL;DR: It is reported that graphene coatings do not significantly disrupt the intrinsic wetting behaviour of surfaces for which surface-water interactions are dominated by van der Waals forces, and contact angle measurements indicate that a graphene monolayer is wetting-transparent to copper, gold or silicon, but not glass, for which the wettability is dominated by short-range chemical bonding.