Generatable and Recyclable Oxygen Vacancy-Modified FeO-Decorated WO Nanowires with Super Stability for ppb-Level HS Sensing.

Detecting hydrogen sulfide (HS) odor gas in the environment at parts-per-billion-level concentrations is crucial. However, a significant challenge is the rapid deactivation caused by SO deposition. To address this issue, we developed a sensing material comprising FeO-decorated WO nanowires (FWO) with strong interfacial interaction.

Surface Defect-Induced Specific Catalysis Activates 100% Selective Sensing toward Amine Gases at Room Temperature.

Achieving selective sensing toward target volatile organic compound gases is of vital importance in the fields of air quality assessment, food freshness evaluation, and diagnosis of patients via exhaled breath. However, chemiresistive sensors that exhibit specificity like biological enzymes in a complex environment are rare. Herein, we developed a strategy of optimizing oxygen vacancy structures in tin oxides to induce specific catalysis, activating 100% selective sensing toward amine gases at room temperature.

Mechanism of Interfacial Molecular Interactions Reveals the Intrinsic Factors for the Highly Enhanced Sensing Performance of Ag-Loaded CoO.

The noble metal-loaded strategy can effectively improve the gas-sensing performances of metal oxide sensors. However, the gas-solid interfacial interactions between noble metal-loaded sensing materials and gaseous species remain unclear, posing a significant challenge in correlating the physical and chemical processes during gas sensing. In this study, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and Raman spectroscopy were conducted to collaboratively investigate the interfacial interactions involved in the ethanol gas-sensing processes over CoO and Ag-loaded CoO sensors.

Chemical Discrimination of Benzene Series and Molecular Recognition of the Sensing Process over Ti-Doped CoO.

This work achieved the chemical discrimination of benzene series (toluene, xylene isomers, and ethylbenzene gases) based on the Ti-doped CoO sensor. Benzene series gases presented different gas-response features due to the differences in redox rate on the surface of the Ti-doped CoO sensor, which created an opportunity to discriminate benzene series via the algorithm analysis. Excellent groupings were obtained via the principal component analysis.

Lattice expansion and oxygen vacancy of α-FeO during gas sensing.

Identifying the nature of gas-sensing material under the real-time operating condition is very critical for the research and development of gas sensors. In this work, we implement in situ Raman and XRD to investigate the gas-sensing nature of α-FeO sensing material, which derived from Fe-based metal-organic gel (MOG). The active mode of α-FeO as gas-sensing material originate from the thermally induced lattice expansion and the changes of surface oxygen vacancy of α-FeO could be reflected from the further monitored Raman scattering signals during acetone gas sensing.

Metal-Organic Gel-Derived Multimetal Oxides as Effective Electrocatalysts for the Oxygen Evolution Reaction.

Exploring efficient and durable catalysts derived from earth-abundant and cost-effective materials is a highly desirable route to overcome the sluggish anodic oxygen evolution reaction (OER). A series of multinary metal-organic gels (MOGs) with various and alterable metal element compositions are prepared by straightforward mixing of metal ions with ligand 4,4',4''-[(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)]tribenzoic acid (H TATAB) in solution at room temperature. Spinel-type metal oxides with excellent electrocatalytic OER performance were then obtained through calcination of the as-synthesized MOGs.

Cascade Reaction of Morita-Baylis-Hillman Acetates with 1,1-Enediamines or Heterocyclic Ketene Aminals: Synthesis of Highly Functionalized 2-Aminopyrroles.

A new strategy for the construction of two kinds of fully substituted pyrroles, including 2-aminopyrroles and bicyclic pyrroles from Morita-Baylis-Hillman (MBH) acetates with 1,1-enediamines (EDAMs), or heterocyclic ketene aminals (HKAs) via base-promoted tandem Michael addition, elimination, and aromatization sequence has been developed, affording the expected products in moderate to excellent yields. This methodology is a highly efficient, concise way to access 2-aminopyrroles or bicyclic pyrroles with diversity in molecular structures from accessible building blocks under moderate reaction conditions.