Facile Fabrication of ZnO-ZnFe2O4 Hollow Nanostructure by a One-Needle Syringe Electrospinning Method for a High-Selective H2S Gas Sensor

Materials

Ryun Na Kim¹  Yoseb Song²  Jinhyeong Kwon³  Kee-Ryung Park³  Hyeunseok Choi³ 

[1] Department of Energy Engineering, Dankook University, 119, Dandae-ro, Dongnam-gu, Chungcheongnam-do, Cheonan-si 31116, Korea;Korea Institute for Rare Metals, Korea Institute of Industrial Technology (KITECH), 156 Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea;Smart Manufacturing System R&D Department, Korea Institute of Industrial Technology (KITECH), 89 Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Chungchengnam-do, Cheonan 31056, Korea;

关键词: ZnO;    ZnFe₂O₄;    hollow nanostructure;    electrospinning;    H₂S;    gas sensor;   

DOI  :  10.3390/ma15020399

来源: DOAJ

【 摘 要 】

Herein, a facile fabrication process of ZnO-ZnFe₂O₄ hollow nanofibers through one-needle syringe electrospinning and the following calcination process is presented. The various compositions of the ZnO-ZnFe₂O₄ nanofibers are simply created by controlling the metal precursor ratios of Zn and Fe. Moreover, the different diffusion rates of the metal oxides and metal precursors generate a hollow nanostructure during calcination. The hollow structure of the ZnO-ZnFe₂O₄ enables an enlarged surface area and increased gas sensing sites. In addition, the interface of ZnO and ZnFe₂O₄ forms a p-n junction to improve gas response and to lower operation temperature. The optimized ZnO-ZnFe₂O₄ has shown good H₂S gas sensing properties of 84.5 (S = R_a/R_g) at 10 ppm at 250 °C with excellent selectivity. This study shows the good potential of p-n junction ZnO-ZnFe₂O₄ on H₂S detection and affords a promising sensor design for a high-performance gas sensor.

【 授权许可】

Unknown