title: Au-Loaded Hierarchical MoO3Hollow Spheres with Enhanced Gas-Sensing Performance for the Detection of BTX (Benzene, Toluene, And Xylene) And the Sensing Mechanism.
abstract: Monodisperse, hierarchical α-MoO3hollow spheres were fabricated using a facile template-free solvothermal method combined with subsequent calcination. Various quantities of Au nanoparticles (NPs) were deposited on the α-MoO3hollow spheres to construct hybrid nanomaterials for chemical gas sensors and their BTX sensing properties were investigated. The 2.04 wt % Au-loaded α-MoO3sensor can detect BTX effectively at 250 °C, especially, its responses to 100 ppm toluene and xylene are 17.5 and 22.1, respectively, which are 4.6 and 3.9 times higher than those of pure α-MoO3hollow spheres at 290 °C. Besides, Au loading decreased the response times to toluene and xylene from 19 and 6 s to 1.6 and 2 s, respectively, lowered the working temperature from 290 to 250 °C as compared with those of pure α-MoO3. The surface status of Au/α-MoO3hollow spheres before and after contacting with toluene at 250 °C was analyzed through XPS technique. Possible oxidization product of toluene was confirmed by GC for the first time. The gas-sensing mechanism of the Au/α-MoO3was speculated as the oxidation of toluene to water and carbon dioxide by chemisorbed oxygen and lattice oxygen. The possible reason related with improved gas-sensing properties of the Au-functionalized α-MoO3was discussed.
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.|School of Chemistry and Chemical Engineering, Qiqihar University , Qiqihar 161006, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Sui
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.
authors.forename: Xianfa
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.|School of Chemistry and Chemical Engineering, Qiqihar University , Qiqihar 161006, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.
authors.forename: Yingming
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Gao
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University , Harbin 150080, China.
authors.forename: Lihua
authors.identifier: http://orcid.org/0000-0003-1725-0148
authors.initials: L
authors.lastname: Huo
keywords: Au/α-MoO3 hollow spheres; BTX sensor; hierarchical structure; load; sensing mechanism