Atom-economical synthesis of ZnO@ZIF-8 core-shell heterostructure by dry gel conversion (DGC) method for enhanced H2 sensing selectivity

被引：43

作者：

Ji, Peng ^{[1
,2
]}

Hu, Xuefeng ^{[3
,4
]}

Tian, Renbing ^{[1
]}

Zheng, Hua ^{[1
]}

Sun, Jinghua ^{[1
]}

Zhang, Wei ^{[3
,4
]}

Peng, Junbiao ^{[2
]}

机构：

[1] Dongguan Univ Technol, Sch Elect Engn & Intelligentizat, 1 Daxue Rd, Dongguan 523808, Peoples R China

[2] South China Univ Technol, State Key Lab Luminescent Mat & Devices, 381 Wushan Rd, Guangzhou 510640, Peoples R China

[3] Hefei Univ Technol, Res Ctr Sensor Sci & Technol, Sch Instrument Sci & Optoelect Engn, 193 Tunxi Rd, Hefei 230009, Peoples R China

[4] Hefei Univ Technol, Special Display & Imaging Technol Innovat Ctr Anh, 193 Tunxi Rd, Hefei 230009, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2020年 / 8卷 / 08期

关键词：

GAS SENSOR; ZNO NANORODS; ZIF-8; MICROSPHERES; IMPROVEMENT; FRAMEWORKS; STABILITY;

D O I：

10.1039/c9tc06530j

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The biggest challenge for metal oxide-based hydrogen gas sensors is to eliminate the interference of other gases. Zeolitic imidazolate frameworks, such as ZIF-8, are ideal filters for large molecules because of their fixed pore size. In this paper, the green and economic synthesis method of dry gel conversion (DGC) was first utilized to convert the surface of ZnO into ZIF-8 with 2-methylimidazole (MeIM) as ligand, and a ZnO@ZIF-8 core-shell structure was successfully constructed. TEM et al. characterizations indicated that the thickness of ZIF-8 shell was effectively controlled by the initial MeIM/ZnO molar ratio. The synthesized ZnO@ZIF-8 showed an excellent selective response for H-2 (2.4 to 100 ppm and 0.9 to 50 ppm) over toluene (2.6 to 10 ppm and 0.3 to 1 ppm) at an optimal heating voltage of 5 V as the initial MeIM/ZnO ratio was 0.2, which confirmed that ZnO@ZIF-8 prepared by DGC method showed excellent promise for a practical application as a selective H-2 detector.

引用

页码：2927 / 2936

页数：10

共 40 条

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