Graphene Oxide Membrane/Conical Nanoporous Polyimide Composites for Regulating Ion Transport

doi:10.1021/acsanm.1c00997

	Graphene Oxide Membrane/Conical Nanoporous Polyimide Composites for Regulating Ion Transport
	Bian, Yubo 1; Dong, Yuhua 2,3,4; Liu, Jiande 2,4; Sun, Youmei 2,3; Duan, Jinglai 2,3,5; Liu, Jie 2,3; Yao, Huijun 2,3,5,6
刊名	ACS APPLIED NANO MATERIALS
	2021-07-23
卷号	4 期号:7 页码:6964-6973
关键词	ionic rectification effect graphene oxide membrane ion irradiation PI membrane ion transport
ISSN号	2574-0970
DOI	10.1021/acsanm.1c00997
通讯作者	Yao, Huijun(yaohuijun@impcas.ac.cn)
英文摘要	The ionic rectification effect, an important phenomenon existing in the solid-state nanopore system, has attracted much attention due to its ability to significantly regulate ion transport in the nanopores. However, current research mainly focuses on the single nanopore systems with low ionic currents, and thus further practical applications are limited. In this work, the conical nanoporous polyimide (CNPI) membrane was prepared by ion irradiation and asymmetric chemical etching to increase the ionic current, and the graphene oxide membrane (GOM) was spin-coated on it to improve the corresponding ionic flux and rectification effect after that. It was found that the ionic rectification ratio (0.05 M KCl at 3 V) increased from 17 (CNPI membrane) to 63 (GOM/CNPI composite) with the ionic current in microamperes. The enhanced rectification effect was ascribed to the increased geometry asymmetry and charge asymmetry, which further increased the difference of ionic conductance at opposite bias. Moreover, the corresponding COMSOL simulation revealed that the enhanced ion depletion and enrichment appeared in the nanochannel, especially at the tip side of conical nanopores after the GOM was spin-coated on the CNPI membrane. Finally, it was also confirmed that the GOM/CNPI composite can exhibit a good rectification effect and chemical durability in a wide acidic condition (pH 1 to 6), which extends the practical applications of the conical nanopore in a nanofluidic system.
资助项目	National Nature Science Foundation of China[11775279] ; National Nature Science Foundation of China[11575261]
WOS关键词	CURRENT RECTIFICATION ; MEMBRANES
WOS研究方向	Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000677582900047
资助机构	National Nature Science Foundation of China
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/136738]
专题	中国科学院近代物理研究所
通讯作者	Yao, Huijun
作者单位	1.Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Lanzhou Univ, Sch Phys Sci & Technol, Key Lab Magnetism & Magnet Mat, Minist Educ, Lanzhou 730000, Peoples R China 5.Adv Energy Sci & Technol Guangdong Lab, Huizhou 516000, Peoples R China 6.Huizhou Res Ctr Ion Sci, Huizhou 516000, Peoples R China
推荐引用方式 GB/T 7714	Bian, Yubo,Dong, Yuhua,Liu, Jiande,et al. Graphene Oxide Membrane/Conical Nanoporous Polyimide Composites for Regulating Ion Transport[J]. ACS APPLIED NANO MATERIALS,2021,4(7):6964-6973.
APA	Bian, Yubo.,Dong, Yuhua.,Liu, Jiande.,Sun, Youmei.,Duan, Jinglai.,...&Yao, Huijun.(2021).Graphene Oxide Membrane/Conical Nanoporous Polyimide Composites for Regulating Ion Transport.ACS APPLIED NANO MATERIALS,4(7),6964-6973.
MLA	Bian, Yubo,et al."Graphene Oxide Membrane/Conical Nanoporous Polyimide Composites for Regulating Ion Transport".ACS APPLIED NANO MATERIALS 4.7(2021):6964-6973.