Exposed facets induced enhanced acetone selective sensing property of nanostructured tungsten oxide

Ag Nanoparticle-Sensitized WO3 Hollow Nanosphere for Localized Surface Plasmon Enhanced Gas Sensors

“…1 Tungsten oxide (WO 3 ), a popular n-type semiconductor with a relatively wide band gap of 2.6 eV, for its sensitive dependence of electrical resistance on exposed atmosphere, is found to be an excellent chemical sensor material. [2][3][4][5][6][7][8][9][10][11][12][13][14] In fact, it has exhibited an excellent response to a variety of poisonous, explosive and volatile organic compounds (VOCs) including NO x , 2-4 H 2 S, 5-6 CO, 7 H 2 , 8 ethanol, [9][10][11] acetone, [12][13][14] etc. Consider the assembly of 0D nanoparticle, WO 3 hollow nanospheres provide high surface area for chemical reaction and porous structure for effective gas diffusion and therefore exhibit better sensor performance than the bulk WO 3 .…”

Humidity‐Sensing Properties of Ag0 Nanoparticles Supported on WO3‐SiO2 with Super Rapid Response and Excellent Stability

“…[28] Similarly, Jia et al synthesized and evaluated the acetone-sensing properties of WO 3 nanorods. [29] The interaction of water molecules with the surface of a material determines its RH-sensing response and this has stimulated research on increasing the intrinsic surface area by the customization of microstructure and morphology of WO 3 nanostructures to enhance the sensitivity, response/recovery time, selectivity, and stability of WO 3 -based RH sensors. With the aim of improving the sensing response of WO 3 nanomaterials, numerous investigative and innovative endeavors have been made by modifying the materials with noble-metal nanoparticles such as Au, Ag, and Pt.…”

Exploring SnxTi1−xO2 Solid Solutions Grown onto Graphene Oxide (GO) as Selective Toluene Gas Sensors

“…Indeed, most MOS-based gas sensors and, especially those based on the conductivity change upon interaction with gases, are non-specific and, above all, they are usually active at temperatures above 200 • C [19,20]. For instance, small polar molecules are better detected than volatile hydrocarbons, and similar VOCs still give identical responses [21,22]. However, the latter issue can be partially solved by adopting different approaches, such as (i) the synthesis of 3-dimensional hierarchical, mesoporous or hollow networks with enhanced surface activity [23][24][25]; (ii) the engineering of nano-heterojunctions that prompt significant changes in the potential barrier height upon exposure to different analytes [26][27][28]; (iii) the doping or decoration with noble metal nanoparticles having a diverse catalytic effect towards a specific VOC molecule; and (iv) the statistical elaboration of data obtained by multiple sensor arrays [29,30].…”