title: Grain-Size-Tuned Highly H2-Selective Chemiresistive Sensors Based on ZnO-SnO2 Composite Nanofibers.
abstract: We investigated the effect of grain size on the H2-sensing behavior of SnO2-ZnO composite nanofibers. The 0.9SnO2-0.1ZnO composite nanofibers were calcined at 700 °C for various times to control the size of nanograins. A bifunctional sensing mechanism, which is related not only to the SnO2-SnO2 nanograins, but also to the ZnO-SnO2 nanograins with surface metallization effect, is responsible for the grain-oriented H2-sensing properties and the selective improvement in sensing behavior to H2 gas compared to other gases. Smaller grains are much more favorable for superior H2 sensing in SnO2-ZnO composite nanofibers, which will be an important guideline for their use in H2 sensors. The one-dimensional nanofiber-based structures in the present study will be efficient in maximizing the sensing capabilities by providing a larger amount of junctions.
authors.affiliation: Department of Materials Science and Engineering, Inha University , Incheon 402-751, Republic of Korea.
authors.forename: Akash
authors.initials: A
authors.lastname: Katoch
authors.affiliation: Department of Materials Science and Engineering, Inha University , Incheon 402-751, Republic of Korea.
authors.forename: Zain
authors.initials: Z
authors.lastname: Ul Abideen
authors.affiliation: Division of Materials Science and Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
authors.forename: Hyoun Woo
authors.initials: HW
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Inha University , Incheon 402-751, Republic of Korea.
authors.forename: Sang Sub
authors.initials: SS
authors.lastname: Kim
keywords: SnO2; ZnO; hydrogen; nanofibers; oxide; sensors