The humidity dependence of the gas sensing characteristics metal oxide semiconductors has been one greatest obstacles for sensor applications during last five decades because ambient dynamically changes with environmental conditions. Herein, a new and novel strategy is reported to eliminate chemiresistors via dynamic self‐refreshing surface affected by water vapor chemisorption. resistance response pure In 2 O 3 hollow spheres significantly change deteriorate in humid atmospheres. contrast,...

Ultraselective and sensitive detection of xylene toluene with minimum interferences other indoor air pollutants such as benzene, ethanol, formaldehyde is achieved using NiO hierarchical nanostructures doped Cr. Pure 1.15–2.56 at% Cr-doped flower-like assembled from nanosheets are prepared by a simple solvothermal reaction their gas sensing characteristics toward o-xylene gases investigated. The 1.15 show high responses to 5 ppm (ratio resistance = 11.61 7.81, respectively) negligible...

Highly selective and sensitive H₂S sensor was designed using Au@NiO yolk–shell nanoreactors, its gas sensing mechanism suggested.

Formaldehyde, a probable carcinogen, is ubiquitous indoor pollutant, but its highly selective detection has been long-standing challenge. Herein, chemiresistive sensor that can detect ppb-level formaldehyde in an exclusive manner at room temperature designed. The TiO2 exhibits under UV illumination of and ethanol with negligible cross-responses to other pollutants. coating mixed matrix membrane (MMM) composed zeolitic imidazole framework (ZIF-7) nanoparticles polymers on sensing films...

The use of composite materials and polynary compounds is a promising strategy to promote conductometric sensor performances. perovskite oxides provide various compositional combinations between different for tuning gas-sensing reaction endowing rich oxygen deficiencies preferable gas adsorption. Herein, sacrificial colloidal template approach exploited fabricate crystalline ternary LaFeO3 porous thin films, by transferring La3+–Fe3+ hybrid solution-dipped onto substrate sequent heat...

Xylene is a hazardous volatile organic compound, which should be measured precisely for monitoring of indoor air quality. The selective detection ppm-level xylene using oxide semiconductor chemiresistors, however, remains challenging issue. In this study, NiO/NiMoO4 nanocomposite hierarchical spheres assembled from nanosheets were prepared by hydrothermal reaction, and the potential sensors composed these nanocomposites to selectively detect gas was investigated. based on exhibited high...

Ultra-selective and sensitive detection of benzene was achieved using Pd-loaded SnO₂ yolk–shell micro-reactor sensing films coated with a catalytic Co₃O₄ overlayer.

In this work, the role of Pd NPs in gas sensing behavior In₂O₃ Pd@In₂O₃ yolk–shell has been investigated.

Sn-doped NiO multiroom spheres with unique microreactor morphology were prepared by facile ultrasonic spray pyrolysis of a solution containing tin oxalate, nickel nitrate, and dextrin subsequent heat treatment. The structure was formed phase segregation between the molten metal source liquidlike sequent decomposition during pyrolysis, which played dual roles enhancing gas response selectivity. (resistance ratio) to 1 ppm p-xylene as high 65.4 at 300 °C, 50.3 9.0 times higher than those pure...

Abstract A continuous, single‐step, and large‐scale preparation of Pd‐catalyst‐loaded SnO 2 yolk–shell spheres is demonstrated. These nanostructures show an unusually high response selectivity to methyl benzenes, such as xylene toluene, with very low cross‐responses various interfering gases, making them suitable for precise monitoring indoor air quality.

Pure and 0.18–13.2 at.% Fe-doped NiO nanofibers were prepared by electrospinning their gas sensing characteristics microstructural evolution investigated. The responses ((Rg − Ra)/Ra, where Rg is the resistance in Ra air) to 5 ppm C2H5OH, toluene, benzene, p-xylene, HCHO, CO, H2, NH3 at 350–500 ° C significantly enhanced Fe doping of nanofibers, while pure all analyte gases very low Ra)/Ra = 0.07–0.78). In particular, response 100 C2H5OH was up 217.86 times with 3.04 Fe. variation closely...

The rapid and effective transfer of chemical reactants to solid surfaces through porous structures is essential for enhancing the performance nanomaterials various energy environmental applications. In this paper, we report a facile one-pot spray pyrolysis method preparing highly reactant-accessible SnO2 spheres, which have three-dimensionally interconnected size-tunable trimodal (microscale, mesoscale macroscale) pores. For synthetic method, macroscale polystyrene spheres...

Catalyst-loaded hollow spheres are effective at detecting ethanol with high chemical reactivity. However, this has limited the widespread use of catalyst-loaded in designing highly selective gas sensors to less-reactive gases such as aromatics (e.g., xylene). Herein, we report preparation xylene-selective Au-SnO2 nanoreactors by loading Au nanoclusters on inner surface SnO2 shells using layer-by-layer assembly technique. The results revealed that sensor based loaded exhibited unprecedentedly...

The highly selective detection of trace gases using transparent sensors at room temperature remains challenging. Herein, nanopatterned chemiresistors composed aligned 1D Au-SnO2 nanofibers, which can detect toxic NO2 gas under visible light illumination is reported. Ten straight nanofibers are patterned on a glass substrate with electrodes assisted by direct-write, near-field electrospinning, whose extremely low coverage sensing materials (≈0.3%) lead to the high transparency (≈93%) sensor....

Abstract The precise and reversible detection of hydrogen sulfide (H 2 S) at high humidity condition, a malodorous harmful volatile sulfur compound, is essential for the self‐assessment oral diseases, halitosis, asthma. However, selective trace concentrations H S (≈0.1 ppm) in conditions (exhaled breath) challenging because irreversible adsorption/desorption surface chemiresistors. study reports synthesis Fe‐doped CuO hollow spheres as gas‐sensing materials via spray pyrolysis. 4 at.%...

Highly selective, sensitive, and reversible H₂S sensors were designed using Ag-loaded SnO₂ yolk–shell nanostructures prepared by one-pot ultrasonic spray pyrolysis.