文章基本信息

标题：Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry
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作者：Zehai Xu ; Yufan Zhang ; Xu Zhang 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2021
卷号：24
期号：6
页码：1-15
DOI：10.1016/j.isci.2021.102576
语种：English
出版社：Elsevier
摘要：SummaryGraphene oxide (GO) nanosheets with unique structure have received much attention in providing opportunity for high-performance membranes in separation. However, the rational design of ultrathin graphene membranes with controlled structures remains a big challenge. Here, we report a methodology to synthesize dual metal-coordinated ultrathin nanoporous graphene nanofilms by tailoring well-aligned nanocrystals as building blocks on heteroatom-doped GO nanosheets with tunable architectures. Manipulation of metal nitrate as bifunctional dopants realizes N-doping of graphene oxide and preferential growth of α-Mn2O3nanocrystals. Generation of Mn-O-C bond during cross-linking greatly strengthens the stability of membranes for long-term steady operation. Meanwhile, because of spatial confinement effects and high binding energy, N-doped reduced GO nanosheets are desirable supports to construct numerous Mn-N-C bonds, thus generating artificial nanopores to significantly increase nanochannels for ultrafast mass transport. Moreover, the size-selective permeability of ultrathin nanoporous GO-based nanofilms can be optimized by managing the types of metal source for target coordination.Graphical abstractDisplay OmittedHighlights•Dual metal-coordinated GO-based nanofilms are achieved by a general and facile method•Mn-N-C bonds are constructed in rGO nanosheets with N-containing coordinated links•Artificial nanopores are used to increase nanochannels for ultrafast mass transport•Generation of Mn-O-C bond greatly strengthens the stability of nanofilms in separationChemistry; Chemical engineering; Organic chemistry