Gas sensing behavior of p-NiO/n-ZnO composite nanofibers depending on varying p-NiO content: Selectivity and humidity-independence for oxidizing and reducing gas molecules

被引：24

作者：

Jin, Changhyun ^{[1
]}

Choi, Myung Sik ^{[1
,2
]}

Lee, Kyu Hyoung ^{[1
]}

Choi, Sun-Woo ^{[3
]}

机构：

[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea

[2] Kyungpook Natl Univ, Sch Nano & Mat Sci & Engn, Gyeongsangbuk Do 37224, South Korea

[3] Kangwon Natl Univ, Dept Mat Sci & Engn, Gangwon Do 25913, South Korea

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2021年 / 349卷

基金：

新加坡国家研究基金会;

关键词：

p-NiO; n-ZnO; Composite nanofibers; Selectivity; Humidity independence; ROOM-TEMPERATURE; ALPHA-FE2O3; NANORODS; METAL-OXIDES; N-JUNCTIONS; ULTRA-THIN; SENSORS; NO2; NANOCOMPOSITES; HOLLOW; PERFORMANCE;

D O I：

10.1016/j.snb.2021.130813

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this work, we fabricated gas sensors based on p-type NiO/n-type ZnO composite nanofibers (NFs), which could selectively detect oxidizing and reducing gas molecules. The p-type NiO/n-type ZnO composite NFs with both hetero- and homojunctions were successfully synthesized, and their sensing performances for oxidizing and reducing gases were systematically investigated with different composition ratios of p-type NiO and n-type ZnO. Interestingly, for oxidizing and reducing gases, the 0.5NiO-0.5ZnO NFs (nominal composition) exhibited an excellent gas response to oxidizing gases such as NO2 and SO2, whereas the 0.8NiO-0.2ZnO NFs (nominal composition) showed good selectivity for reducing gases such as C3H6O, C2H5OH, and NH3. In addition, we also examined the NO2 and CO sensing performance under a humid atmosphere to confirm the role of the NiO component, which possesses high affinity for water molecules, in p-type NiO/n-type ZnO composite NFs. We discussed the correlation between variations in composition and sensing performances with respect to gas sensing behavior, selectivity, and humidity effect for oxidizing and reducing gases. The results reveal that we successfully imparted selectivity for oxidizing and reducing gas molecules to the p-type NiO/n-type ZnO composite NFs by adjusting the composition ratio of NiO/ZnO.

引用

页数：14