Chelation-assisted soft-template synthesis of ordered mesoporous zinc oxides for low concentration gas sensing

Xinran Zhou, Zhu Yongheng, Wei Luo, Yuan Ren, Pengcheng Xu, Ahmed A. Elzatahry, Xiaowei Cheng, Abdulaziz Alghamdi, Yonghui Deng, Dongyuan Zhao

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53 Citations (Scopus)

Abstract

Semiconductor zinc oxides with a high surface area and porosity offer great potential for their widespread applications, particularly in the areas of optoelectronic devices and solid-state gas sensors owing to their size-dependent physical and chemical properties. Herein, ordered mesoporous ZnO with uniform large mesopores and a crystalline framework is successfully synthesized through a citric acid assisted soft-template strategy using lab-made amphiphilic diblock copolymer poly(ethylene oxide)-b-polystyrene (PEO-b-PS) as a structure directing agent. A gradient calcination treatment is employed to transform the as-made zinc complex/template composites into hierarchically mesoporous crystalline zinc oxides via decomposition of copolymer templates and the intermediate of zinc carbonate, while preserving the highly ordered mesostructure. Owing to its well-connected bimodal mesopores, high surface area and crystalline ZnO framework, the obtained mesoporous ZnO exhibits excellent ethanol sensing performance with a fast response (6 s) and recovery (7 s), and high sensitivity and selectivity.

Original languageEnglish
Pages (from-to)15064-15071
Number of pages8
JournalJournal of Materials Chemistry A
Volume4
Issue number39
DOIs
Publication statusPublished - 21 Oct 2016
Externally publishedYes

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