Journal
ACS NANO
Volume 16, Issue 3, Pages 3934-3942Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c09319
Keywords
graphene oxide; membranes; ultrafast macroscopic assembly; strength; superhydrophilic aisle
Categories
Funding
- National Natural Science Foundation of China [51672204]
- Fundamental Research Funds for the Central Universities [WUT: 2020IB005]
- 2018 National Key R&D Program of China [257]
- Foundation of National Key Laboratory on Electromagnetic Environment Effects [614220504030617]
- ComFuturo Program second Edition-Fundacion General CSIC
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By implanting superhydrophilic cobalt-based metal-organic framework nanosheets into the interlaminar space of graphene oxide (GO) sheets, a high-strength macroscopic membrane with tunable thickness can be prepared quickly. The interlayered hydrophilicity plays a decisive role in the assembly of GO membranes.
A macroscopic-assembled graphene oxide (GO) membrane with sustainable high strength presents a bright future for its applications in ionic and molecular filtration for water purification or fast force response for sensors. Traditionally, the bottom-up macroscopic assembly of GO sheets is optimized by widening the interlaminar space for expediting water passage, frequently leading to a compromise in strength, assembly time, and ensemble thickness. Herein, we rationalize this strategy by implanting a superhydrophilic bridge of cobalt-based metal-organic framework nanosheets (NMOF-Co) as an additional water aisle into the interlaminar space of GO sheets (GO/NMOF-Co), resulting in a high-strength macroscopic membrane ensemble with tunable thickness from the nanometer scale to the centimeter scale. The GO/NMOF-Co membrane assembly time is only 18 s, 30800 times faster than that of pure GO (154 h). More importantly, the obtained membrane attains a strength of 124.4 MPa, which is more than 3 times higher than that of the GO membrane prepared through filtration. The effect of hydrophilicity on membrane assembly is also investigated by introducing different intercalants, suggesting that, except for the interlamellar spacing, the interlayered hydrophilicity plays a more decisive role in the macroscopic assembly of GO membranes. Our results give a fundamental implication for fast macroscopic assembly of high-strength 2D materials.
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