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Luminescent mesoporous films containing europium III complex
摘要： Mesoporous materials have large speci?c area and pore volume, low density, and high mechanical and thermal stability. These materials can be applied as catalysts, shape-selective adsorbents, chemical sensors, and capsules for controlled release of therapeutic agents; they can also be employed in microelectronics, electro-optics, and other emerging nanotechnologies. In this study, we used the sol–gel process to obtain mesoporous silica ?lms by dip coating. A trispyrazolyl borate, or scorpionate (Tp), complex containing europium III was incorporated into a mesoporous silica ?lm via wet impregnation. The silica precursor solution was prepared by homogenizing tetraethylorthosilicate, deionized water, ethanol, and cetyltrimethylammonium bromide. The ?lms were obtained by the dip-coating technique (between one and two depositions) at a deposition rate of 300 mm/min; borosilicate glasses were used as substrates. The ?lms were characterized by X-ray di?raction, infrared spectroscopy, transmittance, and europium III photoluminescence analyses. X-ray di?raction showed that mesoporous silica was present in the substrate. Silica without thermal treatment and silica treated at 200 °C presented pore diameters of 3.75 and 3.45 nm, respectively. Thermal treatment eliminated the surfactant. The excitation and emission spectra con?rmed that the luminescent europium III complex was incorporated into the mesoporous silica ?lm, which can be employed as sensor.
关键词： Mesoporous ?lm,Luminescent sensor,Sol–gel,Dip coating
更新于2025-09-04 15:30:14
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Bandgap Tailored TiO2 Thin Films by Addition of SiO2 for Enhanced Photocatalytic Activity against Congo Red under Visible Light Illumination
摘要： Colloidal solutions of SiO2-TiO2 mixed oxides having different SiO2 contents were synthesized by sol-gel technique and thin films were deposited over glass slides by using dip coating technique. The films were subjected to high temperature at 400 °C for growing TiO2 crystals. Energy dispersive X-ray spectroscopy was used to indicate the elements in the films. X-ray diffraction analysis indicated that SiO2-TiO2 films contain only anatase phase. Scanning electron microscopy was used to study the films surface morphology. The SiO2-TiO2 films that were contacted with congo red (5 ppm) and irradiated with visible light showed a high photocatalytic activity. UV spectrophotometry technique was used to monitor the degradation of congo red by the reduction of main absorbance peak at 497 nm. Complete degradation was achieved after 2 h for 3 mol % SiO2-TiO2 thin film.
关键词： Congo red,SiO2,Dip coating,TiO2,Photocatalytic activity
更新于2025-09-04 15:30:14
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Angle dependence of synthesized BiOI prepared by dip coating and its effect on the photovoltaic performance
摘要： A study about the angle effect on the synthesis of BiOI films via modified successive ionic layer adsorption and reaction (SILAR) and its application as p-type semiconductor in solar cell construction have been carried out. By involving the angle inclination on the BiOI synthesis process in this work, it showed the impact on the BiOI film thickness. We found the thicker films contained larger flaky morphology which was displayed by the FESEM image. Also, it exhibited an increase of the Bi-I internal stretching mode (Eg) in the Raman spectra, BiOI peak absorbance in the visible region, and its crystal intensity in the XRD pattern along with the decreasing angle from 90° to 50° while SILAR process was running. Although our BiOI films performed better Jsc compared to previous studies, their photovoltaic parameters decreased slightly upon the reducing angle, which induced larger BiOI growth in the larger flaky cluster.
关键词： angle dependence,dip coating,photovoltaic performance,BiOI,SILAR
更新于2025-09-04 15:30:14
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Improved Hydrophobicity of Polydimethylsiloxane (PDMS) Coating with ZnO Nanostructures
摘要： In this present work, an environmentally safe hydrophobic cotton surface comprising of PDMS and different morphology of Zinc oxide (ZnO) nanostructures via simple dip coating method was developed. ZnO nanosphere and ZnO nanoflakes were synthesized via sol gel method while ZnO nanorods were synthesized via solution precipitation method. The precursors used to prepared ZnO nanospheres, nanoflakes and nanorods are zinc acetate dehydrate, zinc chloride and zinc nitrate tetrahydrate respectively. ZnO nanostructures were analysed using FESEM and XRD. The hydrophobic cotton surface was characterized via FT-IR and WCA analysis. A WCA of 144.15° was achieved when coating the cotton with ZnO nanoflakes (ZnO-NF:PDMS).
关键词： ZnO nanostructures,Polydimethylsiloxane,Solution precipitation method,Hydrophobicity,Sol gel method,Dip coating
更新于2025-09-04 15:30:14
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Electro-photocatalytic Fenton Decolorization of Orange G Using Mesoporous TiO2/stainless Steel Mesh Photo-Electrode Prepared by the Sol-Gel Dip-Coating Method
摘要： A photo-electrochemical process is a powerful and eco-friendly method for treating industrial wastewater. Electro-photocatalytic Fenton (EPF) was employed for orange G decolorization using two kinds of photo-electrodes with TiO2 film-coated stainless steel (SS) mesh. These photo-electrodes are prepared by a dip-coating method from the sol-gel-derived TiO2 sols incorporating with various amounts of P25+TiO2 powders (SGDC method). The single dip-coated electrode with the TiO2 sol containing 50 g/L P25 powders possesses similar crystallinity and decolorization performance to the four repetitive dip-coated electrodes with pure TiO2 sol. The kinetics of orange G decolorization using P25+TiO2 film electrode in photocatalytic (PC), electro-Fenton (EF) and EPF processes followed pseudo first-order kinetics model, and the EPF has the highest reaction rate. The efficiency of orange G decolorization achieves 78% via the EPF reaction for 3 h. The SGDC method using the TiO2 sol containing P25 powders not only enhances the TiO2 coating on the SS substrate, but also produces microcracks in the film, that facilitates the in-situ generation of ferrous ions and further induces the EPF reaction for an effective degradation of organic matter in wastewater.
关键词： mesoporous film,P25 TiO2,Sol-gel dip-coating (SGDC),electro-photocatalytic Fenton (EPF)
更新于2025-09-04 15:30:14