Procedure for the Transfer of Polymer Films Onto Porous Substrates with Minimized Defects [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 500.51 Natural sciences and mathematics

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2019

Mô tả vật lý: Size: Article No. e59554 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 256182

The fabrication of devices containing thin film structures necessitate the transfer of these films onto the surfaces of arbitrary support substrates. Accomplishing this transfer in a highly controlled, mechanized, and reproducible manner would eliminate the creation of macroscale defect structures (e.g. tears, cracks, and wrinkles) within the thin film that would otherwise have a negative impact on ultimate device performance. In this work, we describe a general protocol for the highly controlled and mechanized transfer of a polymeric thin film onto an arbitrary porous support substrate for eventual use as a water filtration membrane device. Specifically, we fabricate a block copolymer (BCP) thin film on top of a sacrificial, water-soluble poly(acrylic acid) (PAA) layer and silicon wafer substrate. We then utilize a custom-designed, 3D-printed transfer tool and drain chamber system to deposit, lift-off, and transfer the BCP thin film onto the center of a porous anodized aluminum oxide (AAO) support disc. The transferred BCP thin film is shown to be consistently placed onto the center of the support surface due to the guidance of the meniscus. Additionally, we compare our mechanized transfer-processed thin films to those that have been transferred by other commonly used techniques, such as by hand with the use of tweezers. Optical inspection and image analysis of the transferred thin films from the mechanized process confirm that little-to-no macroscale inhomogeneities or plastic deformations are produced, as compared to the multitude of tears and wrinkles produced from manual transfer by hand. Our findings indicate that the proposed strategy for thin film transfer can reduce defects when compared to other methods across many systems and applications.
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