A General and Straightforward Route to Noble Metal‐Decorated Mesoporous Transition‐Metal Oxides with Enhanced Gas Sensing Performance

Abstract

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201904240. the gas sensor based on Au/WO 3 materials possess enhanced ethanol sensing performance with a good response (R air /R gas = 36-50 ppm of ethanol), high selectivity, and excellent low-concentration detection capability (down to 50 ppb) at low working temperature (200 °C). www.advancedsciencenews.com

Pd-Decorated PdO Hollow Shells: A H2-Sensing System in Which Catalyst Nanoparticle and Semiconductor Support are Interconvertible

“…In this hybrid sensing system, the resistance of SMO support is monitored in real time with the variation in H 2 concentration while Pd NPs act as catalysts that promote the interaction between the SMO support and H 2 . − Among various SMO supports, n-type semiconductors such as SnO 2 , TiO 2 , ZnO, and WO 3 are commonly selected because of their intrinsic high sensing response and readily controllable morphology . However, the decoration of Pd NPs on these kinds of SMO supports always involves cumbersome multistep processes, such as the preparation of Pd NPs, prefunctionalization of SMO support, and the combination of these two parts. − Apparently, a hybrid sensing system that can be synthesized by a one-step process is more attractive for its convenience, time savings, and low consumption. , …”

Controllable Multicomponent Co‐Assembly Approach to Ordered Mesoporous Zirconia Supported with Well‐Dispersed Tungsten Oxide Clusters as High‐Performance Catalysts

“…Taking meso-0.10WO x / ZrO 2 as an example, the Zr 3d XPS spectrum shows two well-resolved peaks at 182.6 and 185.0 eV (Figure 5A), which are assigned to Zr 4 + 3d 5/2 and Zr 4 + 3d 7/2 , [64] respectively. In addition, valence states of W species in meso-0.10WO x /ZrO 2 are analyzed by the W 4 f XPS spectrum (Figure 5B), where peaks at 38.0 and 35.9 eV are assigned to W 6 + 4f 5/2 and W 6 + 4f 7/2 respectively, [57] demonstrating the existence of hexavalent tungsten in polytungstates of WO x clusters that perform as acid sites in catalytic reactions. The results further indicate that introduction of W species in mesoporous skeletons does not affect the valence states of Zr species.…”

“…[47] In past decade, using the labmade amphiphilic diblock copolymer of poly(ethylene oxide)-bpolystyrene (PEO-b-PS) with rich sp 2 carbon and high glass transition temperature as template, our group has developed a facile and universal strategy for the synthesis of several highly ordered mesoporous metal oxides with single or multiple components. [54][55][56][57][58][59][60][61][62] However, until now no work has been reported about the synthesis of ordered mesoporous solid acids based on composite metal oxides. [19] Herein, by using a high molecular weight amphiphilic diblock copolymer (PEO 114 -b-PS 221 ) as the soft template, a controllable multicomponent co-assembly strategy was adopted to directly synthesize ordered mesoporous WO x /ZrO 2 solid acids (OMWZr) with tunable W contents and acid amounts.…”

Electrospun ZnSnO₃/ZnO Composite Nanofibers and Its Air-Sensitive Properties

“…In recent years, with the increasing demand for the detection of toxic gases, volatile organic compounds and clinical gas analysis, gas sensor research has become more and more extensive. High sensitivity, fast response, excellent selectivity and long-term stability are the basic parameters of a highly sensitive gas sensor [1]. Semiconductor metal oxide gas sensors have attracted much attention because of their advantages such as fast response, low cost, simple structure and good compatibility.…”