Citation: Wang Changyao, Li Yuhui, Qiu Pengpeng, Duan Linlin, Bi Wei, Chen Yan, Guo Dingyi, Liu Yupu, Luo Wei, Deng Yonghui. Controllable synthesis of highly crystallized mesoporous TiO₂/WO₃ heterojunctions for acetone gas sensing[J]. Chinese Chemical Letters, ;2020, 31(5): 1119-1123. doi: 10.1016/j.cclet.2019.08.042 shu

Controllable synthesis of highly crystallized mesoporous TiO₂/WO₃ heterojunctions for acetone gas sensing

Wang Changyao ^a,1 ,
Li Yuhui ^a,1 ,
Qiu Pengpeng ^a ,
Duan Linlin ^a ,
Bi Wei ^c,*, ,
Chen Yan ^a ,
Guo Dingyi ^a ,
Liu Yupu ^a ,
Luo Wei ^b,*, ,
Deng Yonghui ^a

a.
Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China
b.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai 201620, China
c.
Department of Stomatology, Zhongshan Hospital, Fudan University, Shanghai 200032, China

bi.wei@zs-hospital.sh.cn

wluo@dhu.edu.cn

Received Date: 10 July 2019
Revised Date: 9 August 2019
Accepted Date: 26 August 2019
Available Online: 26 August 2019

Figures(4)

Mesoporous semiconducting metal oxides (SMOs) heterojunctions are appealing sensors for gas detecting. However, due to the different hydrolysis and condensation mechanism of every metal precursor and the contradiction between high crystallinity and high surface area, the synthesis of mesoporous SMOs heterojunctions with highly ordered mesostructures, highly crystallized frameworks, and high surface area remains a huge challenge. In this work, we develop a novel "acid-base pair" adjusted solvent evaporation induced self-assembly (EISA) strategy to prepare highly crystallized ordered mesoporous TiO₂/WO₃ (OM-TiO₂/WO₃) heterojunctions. The WCl₆ and titanium isopropoxide (TIPO) are used as the precursors, respectively, which function as the "acid-base pair", enabling the coassembly with the structure directing agent (PEO-b-PS) into highly ordered mesostructures. In addition, PEO-b-PS can be converted to rigid carbon which can protect the mesostructures from collapse during the crystallization process. The resultant OM-TiO₂/WO₃ heterojunctions possess primitive cubic mesostructures, large pore size (~21.1 nm), highly crystalline frameworks and surface area (~98 m²/g). As a sensor for acetone, the obtained OM-TiO₂/WO₃ show excellent response/recovery performance (3 s/5 s), good linear dependence, repeatability, selectivity, and long-term stability (35 days).
- Mesoporous materials,
- Acetone gas sensing,
- Heterojunctions,
- TiO₂,
- WO₃
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沈阳化工大学材料科学与工程学院沈阳 110142

Controllable synthesis of highly crystallized mesoporous TiO2/WO3 heterojunctions for acetone gas sensing

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通讯作者: 陈斌, bchen63@163.com

Controllable synthesis of highly crystallized mesoporous TiO₂/WO₃ heterojunctions for acetone gas sensing