title: Porous Ga-In Bimetallic Oxide Nanofibers with Controllable Structures for Ultrasensitive and Selective Detection of Formaldehyde.
abstract: The design of appropriate composite materials with unique surface structures is an important strategy to achieve ideal chemical gas sensing. In this paper, efficient and selective detection of formaldehyde vapor has been realized by a gas sensor based on porous GaxIn2-xO3nanofibers assembled by small building blocks. By tuning the Ga/In atomic ratios in the materials, crystallite phase, nanostructure, and band gap of as-obtained GaxIn2-xO3nanofibers can be rationally altered. This further offers a good opportunity to optimize the gas sensing performances. In particular, the sensor based on porous Ga0.6In1.4O3nanofibers assembled by small nanoparticles (∼4.6 nm) exhibits best sensing performances. Toward 100 ppm formaldehyde, its highest response (Ra/Rg= 52.4, at 150 °C) is ∼4 times higher than that of the pure In2O3(Ra/Rg= 13.0, at 200 °C). Meanwhile, it has superior ability to selectively detect formaldehyde against other interfering volatile organic compound gases. The significantly improved sensing performance makes the Ga0.6In1.4O3sensor very promising for selective detection of formaldehyde.
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China.|State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China.
authors.forename: Jiabo
authors.initials: J
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China.
authors.forename: Guo-Dong
authors.initials: GD
authors.lastname: Li
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China.
authors.forename: Cundi
authors.initials: C
authors.lastname: Wei
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China.
authors.forename: Xiaoxin
authors.identifier: http://orcid.org/0000-0003-4143-9274
authors.initials: X
authors.lastname: Zou
keywords: Ga2O3; In2O3; formaldehyde; gas sensor; porous nanofibers