Synthesis of Polyhedral ZnSnO₃ Microcrystals with Controlled Exposed Facets and Their Selective Gas‐Sensing Properties

Abstract

A sensitive face: Polyhedral ZnSnO3 microcrystals with controlled exposed facets are selectively synthesized in high yield by a convenient, repeatable, and low‐temperature process (see image). The polyhedral ZnSnO3 particles have good gas‐sensing properties and show high sensitivity to H2S, HCHO, and C2H5OH, as well as good reproducibility and short response/recovery times. Different shapes of ZnSnO3 polyhedra have unique gas sensitivity to the detected gases because of their different active facets.

Metal Oxide Gas Sensors: Sensitivity and Influencing Factors

“…The reactivity and selectivity of a nanocatalyst can be tailored by controlling the shape, as it will determine the crystallographic facets exposed on the surface of a nanocrystal and therefore the number of atoms located at the edges or corners. In [60], uniform octahedral, truncated octahedral, and 14-faceted polyhedral ZnSnO 3 microcrystals was prepared through addition of different amount of sodium dodecylbenzene sulfonate (SDBS) (Figure 9) and gas responses exposure to H 2 S, HCHO and C 2 H 5 OH were tested (Figure 10). The results indicated that the 14-faceted polyhedral ZnSnO 3 has a higher sensitivity than the octahedral, due to a larger active surface area of {100} facets, which can provide more active space for the interaction between ZnSnO 3 and target gases.…”

“…Typical SEM images of the as-prepared ZnSnO 3 products: (a) CTAB = 0.15 M; (b) CTAB = 0.4 M; (c) CTAB = 0.75 M. (d) The corresponding XRD patterns of the as-prepared ZnSnO 3 polyhedra, A: octahedra; B: truncated octahedra; C: 14-faceted polyhedra (adapted from [60]).…”

Synthesis of ZnGa2O4 assisted by high-energy ball milling and its gas-sensing characteristics

“…ZnO [12,13] and Ga 2 O 3 [14,15] have also received a great deal of research interest because of their superior sensing properties. Current research in gas sensor technology has been focused on the development of hybrid sensing materials, such as binary and ternary metal oxides, which offer an important path to combine the different physical and chemical properties of individual components into one system [16][17][18][19].…”

Organometallic synthesis of ZnO nanoparticles for gas sensing: towards selectivity through nanoparticles morphology

“…The modification of the exposed crystalline faces of ZnSnO 3 polyhedral microcrystals has been reported to considerably modify their response to H 2 S, HCHO, and C 2 H 5 OH but without significant change of selectivity (Geng et al 2008). SnO 2 , ZnO, and In 2 O 3 nanostructures have been reported to present different response level to NH 3 gas depending on their shape (i.e., nanorods (NR) or NP) (Rout et al 2007).…”