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Rational design of sensitivity enhanced and stability improved TEA gas sensor assembled with Pd nanoparticles-functionalized In2O3 composites
摘要： In this work, special triethylamine (TEA) gas sensors based on Pd nanoparticles (NPs)-decorated In2O3 microstructures with different Pd amount have been successfully fabricated. The optimal sensor based on 3 wt% Pd-loaded In2O3 shows higher gas response compared with other content of Pd wt% and exhibits the highest response of 47.56 when exposed to 50 ppm TEA gas. Furthermore, 3 wt% Pd NPs-In2O3 sensor not only possesses superior response and recovery properties of 4 s and 17 s under 50 ppm TEA gas, respectively, but also displays outstanding selectivity to TEA gas at the existence of other interfering gases. Based on the model of depletion layer, the possible gas sensing mechanism are studied and the results show that, the synergistic effect between the sensitization exerted by Pd nanoparticles and structural defects may be responsible for the remarkably enhanced TEA sensing performance. Considering the superiority including low cost, simple structure, and facile fabrication, 3 wt% Pd NPs-In2O3 microstructures are promising for high-performance TEA sensing applications.
关键词： Triethylamine,In2O3,Gas sensors
更新于2025-11-14 17:04:02
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Synthesis of Chalcogenides and Metal Complex of 2-Phenylbenzo[ 1,3,2]dioxophosphinin-4-one
摘要： The chalcogenides and the metal complexes of 2-phenyl-benzo[1,3,2]dioxophosphinin-4-one are prepared by single step reaction of 2-phenyl-benzo[1,3,2]dioxophosphinin-4-one (1) with DMSO, elemental S, Se and W(CO)5CH3CN.
关键词： P-heterocycles,Salicylic acid,Phosphorous-chalcogenides,Triethylamine
更新于2025-09-23 15:21:01
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Hydrogen bonding between ethynyl aromates and triethylamine: IR spectroscopic and computational study
摘要： Ethynylpyridines (EPs) and ethynylbenzene (EB) are multifunctional systems able to participate in hydrogen-bonded complexes as both donors and acceptors of the H-atom. Their structures and stabilities are mainly a function of the hydrogen-bonding properties of the partner in the complex and the surroundings in which the complexation occurs. In this paper, IR spectroscopy and quantum chemical calculations are employed to characterize hydrogen-bonded complexes of 2- and 3-EP and EB with triethylamine (TEA) in tetrachloroethene (C2Cl4) solution. The formation of ≡C?H···N hydrogen bonds is experimentally confirmed by the appearance of TEA concentration-dependent signals in the IR spectra of the EPs and EB. Along with the signals due to unassociated ≡C?H and C≡C oscillators (2-EP: 3308 cm–1 and 2120 cm–1; 3-EP: 3308 cm–1 and 2116 cm–1; EB: 3313 cm–1 and 2113 cm–1) weak, red-shifted signals arise at ~3215 ± 5 cm–1 and ~2105 ± 5 cm–1 which are assigned to the stretching vibrations of hydrogen-bonded ≡C?H··· and C≡C··· oscillators, respectively. This result is at variance with those of previous investigations of EB and TEA in the gas phase. In the 2-EP···TEA complex these bands remain at the same position with increasing TEA concentration. However, in the 3-EP···TEA and EB···TEA complexes the ≡C?H··· stretching band demonstrates a slightly reduced red-shift as the TEA concentration increases, whereas the C≡C··· stretching band absorbs at the same wavenumber in the investigated TEA concentration range. The results of B3LYP-D3 calculations indicate that complexes with more or less linear ≡C?H···N intermolecular hydrogen bonds are more stable than other, dispersion-driven complexes. Complexes with the Cs symmetrical TEA conformer are predicted to have larger binding energy than those formed with the C3 and C1 symmetrical conformers. The predicted IR spectral shifts are slightly different for complexes with the three different TEA conformers. Association constants of hydrogen-bonded complexes at 26 °C are estimated to be ~0.1 mol–1 dm3.
关键词： triethylamine,hydrogen bonding,ethynyl aromates,IR spectroscopy,B3LYP-D3 calculations
更新于2025-09-23 15:21:01
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One-pot synthesis of cubic ZnSnO3/ZnO heterostructure composite and enhanced gas-sensing performance
摘要： In this work, we have successfully prepared cubic ZnSnO3/ZnO heterostructure composite (CZS/ZO) by a one-pot hydrothermal method. This composite easily forms a hollow structure through an alkali etching process while keeping its shape unchanged. The possible growth mechanisms have been studied and the material proves to have excellent gas sensing properties. The response of hollow cubic ZnSnO3/ZnO NPs (HZS/ZO) is up to 101 in 50 ppm triethylamine (TEA) gas at a working temperature of 160 (cid:1)C; the lower limit of detection is 1 ppm. Moreover, the materials exhibit high selectivity and good stability. The role of ZnSnO3/ZnO n-n heterojunction in enhancing gas sensitivity is discussed.
关键词： Heterostructure composite,Triethylamine,Hollow cubic ZnSnO3/ZnO,Gas-sensor
更新于2025-09-10 09:29:36