Highly sensitive NH3 gas sensor based on the porous Ce0.94Zr0.06O2 nano-sheets with ppb level detection limit

JOURNAL OF ALLOYS AND COMPOUNDS

卷:742

Article

Li, Zhijie¹  Wang, Junqiang¹  Zhang, Sa¹  Yan, Shengnan¹  Cao, Baobao²  Shen, Wenzhong³  Wang, Zhiguo¹  Fu, Yong Qing⁴ 

[1] Univ Elect Sci & Technol China, Sch Phys Elect, Chengdu 610054, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China

[3] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China

[4] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

关键词: CeO2;    Nano-sheets;    Porous;    Sol-hydrothermal;    Gas sensor;   

DOI  :  10.1016/j.jallcom.2018.01.327

来源: Elsevier

【 摘 要 】

Porous Ce0.94Zr0.06O2 nano-sheets sensing material was synthesized using a facile sol-hydrothermal process. The average thickness of the Ce0.94Zr0.06O2 nano-sheets was about 8 nm, and the nano-sheets were found to have a mesoporous structure with an average pore size around 2.1 nm. The mesoporous structure of Ce0.94Zr0.06O2 nano-sheets resulted in larger specific surface areas of 185.4 m(2)/g and more pore volumes of 0.51 cm(3)/g than those of CeO2, which was beneficial to the absorption of target gas. Due to the special mesoporous structures in the nano-sheets and the plenty of hydroxyl groups on the surface, the NH3 sensors made of the porous Ce0.94Zr0.06O2 nano-sheets showed a higher sensitivity (87 -100 ppm NH3) and a lower detection limit (100 ppb) at room temperature than the sensors made of pure CeO2 nano-sheets prepared using the similar process. And they exhibited good selectivity, reproducibility and long-term stability to NH3 detection at room temperature. (c) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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