Investigation on Trimethylamine Sensing Performance of PdO‐Decorated ZnO Flower‐Like Structures Synthesized by One‐ Step Hydrothermal Method

Abstract

ZnO and PdO‐decorated ZnO flower‐like structures have been synthesized using a facile one‐step hydrothermal method followed by subsequent calcination. Then, their structural information and trimethylamine (TMA) sensing performance were investigated. The results exhibited that the diameter of these ZnO flower‐like structures was in the range of 3–7 μm. Its morphology was maintained after introducing PdO nanoparticales. By comparing the sensing properties, it is found that sensors based on PdO‐decorated ZnO flower‐like structures showed higher TMA response than that of pure one. Especially, the sensor fabricated by 1 mol% PdO‐decorated ZnO flower‐like structures displayed superior gas sensing performances including high response, rapid response/recover characteristics, good stability, and high selectivity. Such a superior sensing performance is mainly due to the chemical and electrical sensitization of PdO nanoparticles. This simple synthesis strategy and a desirable TMA sensing performance could be broadly developed other metallic doped metal oxide flower‐like structures as high performance sensing materials.

Synergistic Effect of Au–PdO Modified Cu-Doped K2W4O13 Nanowires for Dual Selectivity High Performance Gas Sensing

“…Figure e shows the Pd 3d peaks were fitted into four spin–orbit doublets. The obtained XPS peaks of 343.5, 338.2, 341.4, and 336.4 eV match with XPS peaks identified as Pd 2+ (PdO), Pd 4+ (PdO 2 ), and PdCl 2 complex, respectively. ,− The metallic Pd 0 peak at 335.7 eV was not observed in any of our specimens. The small contribution of the Pd 4+ is indicative of traces of the unstable oxide PdO 2 or PdCl 2 complex which could be stabilized through the interaction with the Cu-doped K 2 W 4 O 13 in the high vacuum environment .…”

Defect-Engineered WO3–x Architectures Coupled with Random Forest Algorithm Enables Real-Time Seafood Quality Assessment

“…Where the sensor-fixed cap is quickly swapped onto the reagent bottle containing the halibut, the volatilized TEA from decayed halibut is adsorbed onto the sensor, generating sensor signals. The mechanism can be explained by the change in electrical resistance due to adsorption and desorption of gas molecules on the metal oxide surface, 62 as illustrated in Figure 5a. When vacuum-annealed WO 2.91 is exposed to air, oxygen molecules in the air are adsorbed on the WO 2.91 surface, trapping free electrons in the conduction band of WO 2.91 and forming adsorbed oxygen ions (mainly in the form of O − ).…”