Citation: Ren Yuan, Yang Xuanyu, Zhou Xinran, Luo Wei, Zhang Yi, Cheng Xiaowei, Deng Yonghui. Amphiphilic block copolymers directed synthesis of mesoporous nickel-based oxides with bimodal mesopores and nanocrystal-assembled walls[J]. Chinese Chemical Letters, ;2019, 30(12): 2003-2008. doi: 10.1016/j.cclet.2019.01.019 shu

Amphiphilic block copolymers directed synthesis of mesoporous nickel-based oxides with bimodal mesopores and nanocrystal-assembled walls

Ren Yuan ^a ,
Yang Xuanyu ^a ,
Zhou Xinran ^a ,
Luo Wei ^b ,
Zhang Yi ^c,*, ,
Cheng Xiaowei ^a ,
Deng Yonghui ^a,*,

a.
Department of Chemistry, State Key Laboratory of Molecular Engineering of Polymers, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iChEM, Fudan University, Shanghai 200433, China
b.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
c.
School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China

wluo@dhu.edu.cn

imzhy@fosu.edu.cn

yhdeng@fudan.edu.cn

Received Date: 23 December 2018
Revised Date: 18 January 2019
Accepted Date: 22 January 2019
Available Online: 22 December 2019

Figures(5)

Mesoporous late-transition metal oxides have great potential in applications of energy, catalysis and chemical sensing due to their unique physical and chemical properties. However, their synthesis via the flexible and scalable soft-template method remain a great challenge, due to the weak organic-inorganic interaction between the frequently used surfactants (e.g., Pluronic-type block copolymers) and metal oxide precursors, and the low crystallization temperature of metal oxides. In this study, ordered mesoporous NiO with dual mesopores, high surface area and well-interconnected crystalline porous frameworks have been successfully synthesized via the facile solvent evaporation-induced co-assembly (EICA) method, by using lab-made amphiphilic diblock copolymer polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) as both the structure-directing agent (the soft template) and macromolecular chelating agents for nickel species, THF as the solvent, and nickel acetylacetonate (Ni(acac)₂) as inorganic precursor. Similarly, by using Ni(acac)₂ and Fe(acac)₃ as the binary precursors, ordered mesoporous Fedoped NiO materials can be obtained, which have bimodal mesopores of large mesopores (32.5 nm) and secondary mesopores (4.0-11.5 nm) in the nanocrystal-assembled walls, high specific surface areas (~74.8 m²/g) and large pore value (~0.167 cm³/g). The obtained mesoporous Fe-doped NiO based gas sensor showed superior ethanol sensing performances with good sensitivity, high selectivity and fast response-recovery dynamics.
- Block copolymer,
- Co-assembly,
- Metal oxides,
- Mesoporous,
- Gas sensing
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