Orderly Stacked Multilayer Carbon Nitride Nanosheets as Membranes for Efficient Hydrogen Separation.

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-09-28 DOI:10.1021/acs.nanolett.5c03423

Yufeng Liu,Dong Luo,Yiduo Wang,Xinyi Ma,Shaohua Shen,Bofeng Bai,Chengzhen Sun

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Abstract

Two-dimensional polymeric carbon nitride (2D PCN) nanosheets with well-defined nanopores are promising for constructing high-performance gas separation membranes. Membranes originated from monolayer nanosheets often suffer from defect formation, low yield, and complex preparation procedures. Multilayer nanosheets offer an alternative to eliminate these defects and enable effective gas separation through intrinsic nanopores; however, disordered stacking during membrane assembly leads to nonselective nanochannels and accordingly reduces separation efficiency. Herein, inspired by the construction of irregular stone walls, we present a novel strategy in which a polymer (poly(vinyl alcohol), PVA) acts as the cement for regulating the ordered stacking of multilayer PCN nanosheets through hydrogen bonding. The resultant PVA/SPCN membrane exhibited an H2 permeability of ∼15,744 Barrer and exceptional selectivity, outperforming the previously reported defect-repaired PCN membrane constructed by monolayer nanosheets and most other 2D membranes. This study provides a scalable and simple approach for constructing 2D membranes via polymer-regulated ordered stacking of multilayer nanosheets.

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有序堆叠多层氮化碳纳米片作为高效氢分离膜。

二维聚合物氮化碳纳米片具有良好的纳米孔，有望用于构建高性能的气体分离膜。由单层纳米片制成的膜通常存在缺陷形成、产率低和制备过程复杂等问题。多层纳米片提供了消除这些缺陷的替代方案，并通过固有的纳米孔实现有效的气体分离；然而，在膜组装过程中，无序堆积导致纳米通道的非选择性，从而降低了分离效率。在此，受不规则石墙结构的启发，我们提出了一种新的策略，即聚合物（聚乙烯醇，PVA）作为水泥，通过氢键调节多层PCN纳米片的有序堆叠。所得的PVA/SPCN膜具有约15,744 Barrer的H2透性和卓越的选择性，优于先前报道的由单层纳米片和大多数其他2D膜构建的缺陷修复PCN膜。该研究提供了一种可扩展且简单的方法，通过聚合物调节多层纳米片的有序堆叠来构建二维膜。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.