Journal
CHINESE CHEMICAL LETTERS
Volume 30, Issue 12, Pages 2003-2008Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2019.01.019
Keywords
Block copolymer; Co-assembly; Metal oxides; Mesoporous; Gas sensing
Categories
Funding
- NSF of China [51372041, 51422202, 21673048, 21875044, 51822202, 51772050]
- Key Basic Research Program of Science and Technology Commission of Shanghai Municipality [17JC1400100]
- Shanghai Rising-Star Program [18QA1400100]
- Fundamental Research Funds for the Central Universities
- Youth Top-notch Talent Support Program of China
- Youth Top-notch Talent Support Program of Shanghai
- DHU distinguished Young Professor Program
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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, THE 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 Fe-doped 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 (similar to 74.8 m(2)/g) and large pore value (similar to 0.167 cm(3)/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. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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