Large-area, transferable sub-lO nm polymer membranes at the air-water interface  

作　　者：Ya Huang Kai Huang Naveed Hussain Hidetoshi Matsumoto Hui Wu 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing, School of Materials Sdence and Engineering, Tsinghua University, Beijing 100084, China [2]Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Tokyo 152-8552, Japan

出　　处：《Nano Research》2018年第7期3833-3843,共11页纳米研究（英文版）

基　　金：This study was supported by the National Basic Research Program of China （Nos. 2015CB932500 and 2013CB632702） and the National Natural Science Foundation of China （No. 51302141）.

摘　　要：Large-area, pinhole-free, and ultrathin polymer membranes with thicknesses of only a few nanometers have attracted increasing attention for their applications in molecular separation, flexible optoelectronics, and sensors. They can potentially be developed for surface protection as well. In this study, we report an effective way to obtain large-scale polymer coatings with a thickness down to 10 nm, which effectively protects metals from corrosion. We develop a facile and scalable method to fabricate freestanding polymer membranes with thickness below 10 nm by dropping the precursor polymer solution on a water surface. By optimizing the surface tension of the polymer solution, the solution could spontaneously spread on the water surface to form a continuous and uniform solid membrane, collected as a freestanding thin membrane. The obtained polymer membranes could then easily be transferred on a metal substrate as highly flexible and stable anti-corrosion coatings. Electrochemical measurements performed in a 0.1 M Na2SO4 solution demonstrated the excellent anti-corrosion properties of the sub-10 nrn polymer membranes whose corrosion rate was less than 1% of the corrosion rate of the bare metal. We also demonstrate that the polymer membrane exhibits high performance as a protection layer for flexible circuits.Large-area, pinhole-free, and ultrathin polymer membranes with thicknesses of only a few nanometers have attracted increasing attention for their applications in molecular separation, flexible optoelectronics, and sensors. They can potentially be developed for surface protection as well. In this study, we report an effective way to obtain large-scale polymer coatings with a thickness down to 10 nm, which effectively protects metals from corrosion. We develop a facile and scalable method to fabricate freestanding polymer membranes with thickness below 10 nm by dropping the precursor polymer solution on a water surface. By optimizing the surface tension of the polymer solution, the solution could spontaneously spread on the water surface to form a continuous and uniform solid membrane, collected as a freestanding thin membrane. The obtained polymer membranes could then easily be transferred on a metal substrate as highly flexible and stable anti-corrosion coatings. Electrochemical measurements performed in a 0.1 M Na2SO4 solution demonstrated the excellent anti-corrosion properties of the sub-10 nrn polymer membranes whose corrosion rate was less than 1% of the corrosion rate of the bare metal. We also demonstrate that the polymer membrane exhibits high performance as a protection layer for flexible circuits.

关 键 词：ultrathin polymer membrane ANTI-CORROSION FREESTANDING water surface 

分 类 号：TG174.451[金属学及工艺—金属表面处理] TQ028.8[金属学及工艺—金属学]