Interfacial Catalysis Enabled Acetone Sensors Based on Rationally Designed Mesoporous Metal Oxides with Erbium‐Doped WO₃ Framework

Abstract

The emerging combination of Internet of Things requires the development of intelligent gas sensor, and semiconductor gas sensors based on metal oxides have been widely applied in industrial production, environmental monitoring, and food safety. Although versatile nanomaterials have been exploited as gas sensitive materials, restricted gas sensing performance including sensitivity, selectivity and stability, is still the fatal problem of practical applications. Herein, inspired by heteratomic doping engineering, unique rare earth erbium (Er)‐doped mesoporous tungsten oxide (Er/mWO3) has been synthesized via one‐step collaborative coassembly strategy, and Er ion‐doped mWO3 exhibited peculiarly hexagonal mesostructure (P63/mmc), tunable specific surface area (58.1–78.3 m2 g–1), uniform mesoporous size and highly crystallized framework with heteroatomic pore wall doping. The introduction of Er can significantly adjust the micro/nano structure and band characteristics, and 1.5 wt% Er‐doped mWO3 displays superior acetone sensing performance, including high response values (107 for 50 ppm), rapid response–recovery dynamics (9/56 s), prominent acetone selectivity, low concentration detection (125 ppb), anti‐humidity property and excellent long‐term stability. Such an excellent sensing performance is mainly attributed to unique interfaces catalytic sites induced by heteroatom interstitial doping. This finding opens a door for the design of smart gas sensors for environmental monitoring and industrial safety.

Ordered Mesoporous Crystalline Frameworks Toward Promising Energy Applications

“…The number of metallic elements capable of forming MCFs does not exceed 30, with a majority of these elements relying on aggregation mechanisms to construct mesostructures; while, the categories that can be assembled into well-defined MCFs with templates comprise only a limited portion of the overall composition (Figure 5). [16,106,[136][137][138][139][140][141][142][143] Currently, the reported MCFs include metallic metals and alloys, metal oxides, sulfides, phosphates, and other metal-based compounds (e. g. MOFs). A detailed introduction of these representative categories will be illustrated in the following sections.…”

Ultrasensitive and Exclusive Chemiresistors with a ZIF-67-Derived Oxide Cage/Nanofiber Co3O4/In2O3 Heterostructure for Acetone Detection

“…To date, various chemiresistive gas sensors, including metal oxide semiconductors (MOSs), ,,, metal dichalcogenides, , transition metal carbides or carbonitrides (Mxenes), , and carbonaceous materials, have attracted considerable attention. Among them, MOSs, such as In 2 O 3 , ,, ZnO, ,, SnO 2 , , WO 3 , CeO 2 , , Co 3 O 4 , and CuO, owing to their low cost, fast response time, simple fabrication, excellent stability, and rich active sites, have been widely used for detecting VOCs. In 2 O 3 , a typical n-type semiconductor with a wide band gap of 2.6 eV, has good electrical and chemical stability.…”

Revealing Disparities in Porous Networks Between Yttria Aerogel Assemblies with Nanosheets and Nanoparticles and Their Ultrathermal Insulation and Optical Properties

“…Yttria (Y 2 O 3 ) possesses a special electronic structure and properties that have enlightened the applications of Y 2 O 3 aerogel in the field of lasers, fluorescence, active catalysts, gas sensors, and thermal insulation . Despite the high symmetrical cubic crystal structure exhibited by solid Y 2 O 3 , anisotropic nanosheets can be obtained through multiple strategies. , A study conducted by Pierre et al.…”