MOF-derived bow-like Ga-doped Co3O4 hierarchical architectures for enhanced triethylamine sensing performance

被引:43
|
作者
Sun, Heming [1 ]
Tang, Xiaonian [1 ]
Zhang, Jiarui [2 ]
Li, Shuo [1 ]
Li Liu [1 ]
机构
[1] Jilin Univ, Coll Phys, Changchun 130012, Peoples R China
[2] Anhui Univ, Coll Chem & Chem Engn, Hefei 230601, Peoples R China
关键词
MOF; Doping; Co3O4; TEA sensor; High responses; HETEROJUNCTION; NANOSHEETS; SENSOR; MICROFLOWERS; FORMALDEHYDE;
D O I
10.1016/j.snb.2021.130546
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Metal-organic frameworks (MOF)-derived semiconductor materials are widely employed in the field of gas sensor because of their unique structural advantages. In this work, hierarchical bow-like Ga-doped Co3O4 architectures assembled by ultrathin and porous nanosheets have been synthesized by the assistance of Co-MOFs. The obtained Ga-doped Co3O4 samples (the molar ratio of Ga/Co = 0, 1%, 2% and 5%) are analyzed using XRD, TEM, FESEM, XPS, BET and PL. The gas sensing performance of the samples is investigated systematically. The results show that 2 at% Ga-doped Co3O4 sensor possesses excellent sensing performance, which is far superior to that of pure Co(3)O(4)sensor. Specifically, 2 at% Ga-doped Co(3)O(4 )sensor shows high responses (108) to 50 ppm triethylamine (TEA) at a low working temperature of 180 degrees C, which are about 30 times than that of pure Co3O4 (3.5). Furthermore, it exhibits rapid response/recovery speed (3 s/15 s), low detection limit (0.1 ppm), excellent selectivity, repeatability and long-term stability. The enhanced gas sensing mechanism and possible selectivity mechanism are discussed in detail.
引用
收藏
页数:11
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