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Binary composites WO3/g-C3N4 in porous morphology: Facile construction, characterization, and reinforced visible light photocatalytic activity
摘要： Various WO3/g-C3N4 binary composites were constructed by a facile one-step calcination procedure and then systematically analyzed for chemophysical properties. Interestingly, these resultant composites showed porous morphology in combination with some tubular structures, where both components were closely contacted to generate heterojunction structures. Accordingly, these composites possessed reinforced visible-light absorption capability and enlarged specific surface areas in texture. These microstructural, morphological, and electronic merits ensured the strengthened photocatalytic performance toward degradation of rhodamine B (RhB) and methylene blue (MB) under visible light irradiation. In addition, on base of reactive species entrapping experiments and analytical results, a probable photocatalysis mechanism was speculated as a “Z-scheme” manner instead of conventional Type II path.
关键词： WO3,Photocatalytic degradation,Mechanism,Porous morphology,Binary composites,g-C3N4
更新于2025-11-14 17:04:02
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Development of Pd/TiO2 Porous Layers by Pulsed Laser Deposition for Surface Acoustic Wave H2 Gas Sensor
摘要： The influence of sensitive porous films obtained by pulsed laser deposition (PLD) on the response of surface acoustic wave (SAW) sensors on hydrogen at room temperature (RT) was studied. Monolayer films of TiO2 and bilayer films of Pd/TiO2 were deposited on the quartz substrates of SAW sensors. By varying the oxygen and argon pressure in the PLD deposition chamber, different morphologies of the sensitive films were obtained, which were analyzed based on scanning electron microscopy (SEM) images. SAW sensors were realized with different porosity degrees, and these were tested at different hydrogen concentrations. It has been confirmed that the high porosity of the film and the bilayer structure leads to a higher frequency shift and allow the possibility to make tests at lower concentrations. Thus, the best sensor, Pd-1500/TiO2-600, with the deposition pressure of 600 mTorr for TiO2 and 1500 mTorr for Pd, had a frequency shift of 1.8 kHz at 2% hydrogen concentration, a sensitivity of 0.10 Hz/ppm and a limit of detection (LOD) of 1210 ppm. SAW sensors based on such porous films allow the detection of hydrogen but also of other gases at RT, and by PLD method such sensitive porous and nanostructured films can be easily developed.
关键词： bilayer films,pulsed laser deposition (PLD),palladium,hydrogen sensor,surface acoustic wave (SAW),Pd/TiO2,porous morphology,titanium dioxide
更新于2025-09-23 15:19:57