Simultaneous Manipulation of Interfacial and Defects Polarization toward Zn/Co Phase and Ion Hybrids for Electromagnetic Wave Absorption

http://www.cell.com/article/S2405844023038082/pdf

Review on magnetic spinel ferrite (MFe2O4) nanoparticles: From synthesis to application

Triethylamine (TEA), a clear and colorless liquid with strong ammonia odor, has great danger to human health and environment. We synthesize the NiO/BiVO4 p-n heterojunction microspheres using hydrothermal method for TEA detection. To characterize the as-prepared samples, XRD, XPS, SEM, UV–vis, and EIS are used. Among the pure NiO, BiVO4, 5%NiO-BiVO4 and 30%NiO-BiVO4, the 10%NiO-BiVO4 sensor exhibits excellent gas sensing properties, including fast response/recovery times, high humidity resistance, and low detection limit of 3.42 ppb toward TEA. Moreover, the enhanced mechanism of NiO/BiVO4 p-n heterojunction microsphere is also proposed. Consequently, NiO coupled with BiVO4 to form NiO-BiVO4 can be an effective strategy for improving TEA gas sensors. 

NiO/BiVO4 p-n heterojunction microspheres for conductometric triethylamine gas sensors

Selective detection of Triethylamine (TEA) is of great significance for environmental monitoring and daily life. In this work, ZnO/MoO3 heterostructures with ultra-sensitive and rapid response-recovery for TEA gas were prepared by a facile hydrothermal method. The ZnO/MoO3 sensor exhibits remarkable reproducibility and long-term stability. Notably, the ZnO/MoO3 sensor achieves a response of 519 for 100 ppm TEA gas at 180 ºC with a detection limit as low as 10 ppb. The superb sensing performance of the ZnO/MoO3 sensor is mainly attributed to the synergistic effect of ZnO and MoO3, and the enhanced electron transfer rate of the heterostructures. In addition, the density functional theory (DFT) calculations were used to explore the sensing mechanism in detail, further confirming the experimental conclusion. Therefore, ZnO/MoO3 sensor has potential application in practical TEA-detection, thus establishing a feasible strategy for promoting gas-sensing properties of metal oxide sensors. 

Ultra-sensitive triethylamine gas sensor based on ZnO/MoO3 heterostructures with ppb level detection

A multi-platform sensor for selective and sensitive H2S monitoring: Three-dimensional macroporous ZnO encapsulated by MOFs with small Pt nanoparticles

New sensing platform of PdO-ZnO-In2O3 nanofibers were prepared by a distinctive catalyst loading method (Pd@ZIF-8) The results of TEM show that Pd nanoparticles is about 2 nm in Pd@ZIF-8 and XPS results demonstrate that it finally exists in the form of ultra-small PdO nanoparticles in composite nanofibers Pure In2O3 and ZnO-In2O3 nanofibers were subjected to comparative gas-sensing investigation to verify the superiority of the PdO-ZnO-In2O3 nanofibers The results suggest that sensors fabricated on PdO-ZnO-In2O3 nanofibers show enhanced triethylamine response (Ra/Rg = 386 to 100 ppm triethylamine), great selectivity and excellent response/recover speed (1 s/740 s) at 250℃ Furthermore, the loading amount of PdO is 02 mol% which is lower than that of the traditional method The distinguished triethylamine gas sensing performance of PdO-ZnO-In2O3 nanofibers could be mainly due to the maximizing the depletion effects of ultra-small PdO catalysts, and the heterojunctions between PdO (ZnO) and In2O3 This work not only proves that PdO-ZnO-In2O3 nanofibers have great potential for triethylamine detection, but also indicates that using ZIF-8 template to design high-performance sensitive materials is an effective method

Sensing platform of PdO-ZnO-In2O3 nanofibers using MOF templated catalysts for triethylamine detection

A facile solvothermal method was employed to synthesize hollow urchin-like core-shell spinel structured ZnO/ZnFe2O4 composite and pure ZnFe2O4 sensing material. As the ratios of Zn to Fe in the precursor are different the final components of the products were also different. Many techniques were used to characterize the crystalline, component and morphology of the as-prepared product. The results revealed that when the ratio of Zn to Fe is 1:2, ZnFe2O4 is the only product, however, when the ratio of Zn to Fe is 1:1 and 2:3, the product was ZnO/ZnFe2O4. SEM and TEM showed that the morphology of the as synthesized product possess unique core-shell hierarchical structure. Gas sensors based on the three sensing material were fabricated and the sensing results displayed that all of the three gas sensors have high gas response to toluene, with operating temperature of 275 (1:1), 275 (2:3), and 250 ℃ (1:2). The sensor based on pure ZnFe2O4 demonstrated a lower operating temperature and a higher gas response of 79–100 ppm toluene. Moreover, the detection limit of pure ZnFe2O4 was as low as 0.2 ppm. In addition, the sensing mechanism was detailed analyzed combined with BET and XPS results.

Highly efficient toluene gas sensor based on spinel structured hollow urchin-like core-shell ZnFe2O4 spheres

Sensors based on Pd/PdO@ZnO-ZnO nanorods (NRs) were fabricated for selective detection of triethylamine (TEA). ZnO NRs were obtained by simple hydrothermal method. The Pd/PdO functionalization was sensitized on ZnO NRs by using metal-organic framework (MOF) templated catalysts (Pd@ZIF-8). Eventually, Pd supported on ZnO nanocubes was about 3 nm and PdO nanoparticles with ~10 nm were loaded on the surface of the ZnO NRs. Gas sensing properties showed that the Pd/PdO@ZnO-ZnO NRs exhibited enhanced response to TEA at 275 ℃ (Rair/RTEA = 258–50 ppm), which was 12.3 folds that of pure ZnO NRs. In addition, the detection limit and working temperature of the sensor were also improved. Importantly, sensors based on Pd/PdO@ZnO-ZnO NRs showed better TEA sensing performance compared to Pd/PdO functionalized samples by the traditional impregnation method. These results could be mainly due to the modulation of sensor base resistance and the catalytic and the spillover effect of PdO and the ultra-small Pd. This work confirms that MOF templated catalyst loading for high performance gas sensors is an effective route to realize the detection of triethylamine gas.

Preparation of Pd/PdO@ZnO-ZnO nanorods by using metal organic framework templated catalysts for selective detection of triethylamine

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Sensing platform of PdO-ZnO-In2O3 nanofibers using MOF templated catalysts for triethylamine detection

Highly efficient toluene gas sensor based on spinel structured hollow urchin-like core-shell ZnFe2O4 spheres

Preparation of Pd/PdO@ZnO-ZnO nanorods by using metal organic framework templated catalysts for selective detection of triethylamine