- 标题
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- 实验方案
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Preparation of Rod-like Aluminum Doped Zinc Oxide Powders by Sol-gel Technique Using Metal Chlorides and Acetylacetone Precursors
摘要： Al-doped ZnO (AZO) powders were prepared by using metal chloride precursors and the sol-gel technique. IR peaks observed at 1590 cm-1 and 1620 cm-1 indicated the formation of metal chelate as a consequence of the addition of acetylacetone to the metal chloride solution. TG-DSC analysis of the AZO gels confirmed the formation of metal chelate as evidenced by the development of several weight loss peaks accompanied by the introduction of new endothermic peaks. The resulting AZO gels were annealed at 500, 600, and 800 ℃ to study the effect of annealing temperature. XRD and SEM results showed that crystallization of AZO gels takes place around 600 ℃. Hexagonal wurtzite structure was identified as the main phase for all the samples. In addition, small shift of the XRD (002) peak coupled with XPS results from the AZO powders confirmed the successful doping of the ZnO powders. Micron sized rod-like AZO powders were uniform in dimension and morphology and remained stable even at 800 ℃.
关键词： rod-like,aluminum doped ZnO,sol gel,metal chloride,acetylacetone
更新于2025-09-23 15:23:52
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The study of Fe-doped CdS nanoparticle-assisted photocatalytic degradation of organic dye in wastewater
摘要： Size-tunable nanoparticles (NPs) for pristine cadmium sulfide (CdS) and iron (Fe)-doped (5, 10 and 15%) CdS were synthesized using facile chemical co-precipitation. Size-controlled NPs were prepared with thioglycolic acid (TGA) as the capping agent and their structural, optical, morphological and physiochemical evaluations were performed using X-ray diffraction (XRD), UV–visible spectroscopy, Raman spectroscopy, field emission scanning electron microscopy (FESEM) and Fourier transform infrared (FTIR). XRD revealed single cubic phase of CdS and later broader peaks upon mixing of Fe, and intensive absorption was recorded in the visible regime upon doping with redshift. FESEM confirmed spherical nanoparticles of Fe–CdS, and Cd–S linkage along with other functional groups was recognized by FTIR. Cd1?xFexS (x = 0, 0.05, 0.10 and 0.15) powder was used as the photocatalyst for methylene blue (MB) degradation in visible light and catalyst in NaBH4’s presence. The control CdS bleached MB faster than doped but doped CdS showed higher catalytic degradation. The Fe-doped CdS NPs showed superior catalytic potential compared to undoped CdS which suggests their use in dye industries, especially leather and tanneries. Additionally, NPs not only show superior catalytic characteristics but also help in cost reduction and complete removal of dyes for wastewater management.
关键词： Metal oxide,Photocatalytic activity,XRD,Graphene,Sol–gel
更新于2025-09-23 15:23:52
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Characterization of atypical polyaniline nano-structures prepared via advanced techniques
摘要： Conductive polymers had been the topic of a vast number of investigations during the last decades, so, the synthesis of conducting polymers and study of their physical properties has been of prime importance. One of these conductive polymers is polyaniline. The current work is to prepare polyaniline (PANI) nanostructured material via four different preparation techniques which were sol-gel, rapid mixing, sonochemical and supercritical carbon dioxide (SC-CO2) assisted polymerization. The morphology of the prepared PANI samples was determined using Transmission electron microscopy (TEM) and Scanning Electron Microscope (SEM). The molecular structure of prepared PANI samples was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The electrical conductivity of the synthesized samples was assessed by using the four-probe method at room temperature. The surface area of the prepared samples was determined using Brunauer Emmett Teller (BET). The characterization results of the prepared PANI con?rm that the morphology, chemical composition, crystallinity, conductivity and surface area were altered signi?cantly as a consequence of its synthesis via atypical techniques.
关键词： Supercritical carbon dioxide assisted polymerization,Nanoparticles,Sonochemical,Polyaniline nano-structures,Nano?bers,Polyaniline characterization,Nanorods,Sol gel,Rapid mixing polymerization
更新于2025-09-23 15:23:52
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Double-function SiO2-DMS coating with antireflection and superhydrophobic surface
摘要： A double-function SiO2 coating with antireflection and superhydrophobic properties was fabricated through a cost-effective and time-efficient sol-gel method. Tetraethoxysilane was used as a precursor to obtain SiO2 with an antireflection property. Hexamethyldisilazane was used as a modifier to produce SiO2-DMS with a superhydrophobic behaviour. The SiO2-DMS coating had a water contact angle of 153° and a water slide angle of <10°. The optimised SiO2-DMS coating had an average transmittance of 96.07% at a wavelength of 300-800 nm. The entire process could be completed in a short time.
关键词： nanoparticle,sol-gel method,superhydrophobic,antireflection
更新于2025-09-23 15:23:52
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Mg dependent Sunlight photocatalytic performance of Nickel ferrite synthesized by a green sol-gel route
摘要： We report an environmentally friendly synthetic strategy to synthesize new nickel ferrite and Mg doped nickel ferrite photocatalysts under modified green sol-gel route in which Aloe Vera gel acts as a natural template. The crystalline phase, surface morphology and size of the prepared photocatalysts were characterized by PXRD, SEM, TEM and HRTEM analysis. The energy band gap of the nanoparticles (NPs) can be tuned in the range of 2.55–2.34 eV by varying the dopant concentration. The photoluminescence analysis indicates that the present NPs are an effective white component in display applications. These synthesized NPs were used for photocatalytic decomposition of recalcitrant pollutants in aqueous media under Sunlight irradiation. When compared to pure, NiFe2O4: Mg2+ (5 mol %), the NiFe2O4: Mg2+ (1mol %) exhibits the highest photocatalytic efficiency for the decomposition of recalcitrant pollutants than that of commercial P25.This enhancement in photocatalytic performance can be mainly attributed to the balance between the parameters, crystallanity,band gap, morphology, crystallite size, defects, dopant amount and combined facets of photocatalysis It opens new window to use this simple greener route to synthesize bi-functional character NPs in the area of photocatalysis particularly waste water treatment and display applications.
关键词： Photo-Fenton catalytic performance,Photoluminescence,Green Sol-gel route,NiFe2O4:Mg2+NPs
更新于2025-09-23 15:23:52
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Spherical LiZnBO3: Structural, Optical and Electrochemical Properties
摘要： Spherical – LiZnBO3 material is synthesized by sol-gel technique and the structural, optical, and electrochemical properties of LiZnBO3 are analyzed. X-ray diffraction result reveals the formation of α-LiZnBO3. Scanning electron microscope and transmission electron microscope image shows spherical morphology and the size of particle is approximetly 80 nm. Absorbance spectra reveal the characteristics band edge of LiZnBO3 is noticed around 210 nm and the band gap is found to be 5.57 eV. Defect-induced intrinsic luminescence is observed in the LiZnBO3 material. The calculated electrical conductivity of LiZnBO3 is 9.52 x 10-9 S/cm. Charge–discharge measurement indicates that the sol-gel synthesized LiZnBO3 delivers a first charge-capacity of 78.82 mAh g-1 at C/10 rate and yields the discharge capacity of 7 mAh g-1 at the 10th cycle. An improved capacity is expected to be reached by further reduction in particle size, doping and conductive carbon coating.
关键词： Sol-gel,Spherical,Optical and electrochemical properties,LiZnBO3
更新于2025-09-23 15:23:52
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Acetic anhydride as oxygen donor in the non-hydrolytic sol-gel synthesis of mesoporous TiO2 with high electrochemical lithium storage performances
摘要： An original, halide-free non-hydrolytic sol-gel route to mesoporous anatase TiO2 with hierarchical porosity and high specific surface area is reported. This route is based on the reaction at 200 °C of titanium (IV) isopropoxide with acetic anhydride, in the absence of a catalyst or of a solvent. NMR studies indicated that this method provides an efficient, truly non-hydrolytic and aprotic route to TiO2. Formation of the oxide involves acetoxylation and condensation successive reactions, both with ester elimination. The resulting TiO2 materials were nanocrystalline, even before calcination. Small (≈10 nm) anatase nanocrystals spontaneously aggregated to form mesoporous micron sized particles with high specific surface area (260 m2 g-1 before calcination). Evaluation of the lithium storage performances showed a high reversible specific capacity, particularly for the non-calcined sample with the highest specific surface area favoring pseudo-capacitive storage: 253 mAh g-1 at 0.1C and 218 mAh g-1 at 1C (C = 336 mA g-1). This sample also showed good cyclability (>92% retention after 200 cycles at 336 mA g-1) with a high coulombic efficiency (99.8 %). Synthesis in the presence of a solvent (toluene or squalane) offers the possibility to tune the morphology and texture of the TiO2 nanomaterials.
关键词： anatase,mesoporous,acetic anhydride route,non-hydrolytic sol-gel,Li-ion batteries
更新于2025-09-23 15:23:52
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Improvement of nickel nanocomposite coatings by combining zinc-doped TiO2 nanoparticles
摘要： Pure nickel and compound of nickel coatings (Ni-TiO2 and Ni-Zn/TiO2) were coated on the steel material using Watts bath with the electrodeposition conditions. Effect of the nanoparticle type and current density on the coating structure, surface morphology of the coating, hardness of the coating, and the corrosion properties of the coatings are presented. Phase and elemental analysis of the coatings were carried out by XRD and EDS techniques, respectively. SEM was used to investigate the surface morphology of the coatings, and Vickers microhardness values were measured to determine the hardness variation of the coatings. NaCl solution (3.5 wt%) was used to evaluate the corrosion properties of the coatings by the potentiodynamic polarization tests. Corrosion current density of 2.890 μA/cm2 for pure nickel coating was improved to 0.379 μA/cm2 by the coating of Zn-doped TiO2 nanoparticles at the 7A/dm2 current density. Microhardness of the Zn-doped TiO2 coating was improved compared to the pure Ni coating.
关键词： Sol-gel processes,Metal matrix composites,Nanoparticles,Composite coatings
更新于2025-09-23 15:23:52
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Preparation of 3D flower-like Fe-Bi2O3 nanocomposite and its photocatalytic performance under visible light irradiation
摘要： The objective followed by this research is the synthesis of 3D ?ower-like Fe-Bi2O3 and the study of its capability for the degradation of Rhodamine B (RhB) under visible light irradiation (λ > 400 nm). Samples were obtained by a simple sol–gel method at room temperature. The as-prepared Fe-Bi2O3 exhibited excellent photocatalytic performance under the visible light due to its relatively narrow band gap energy (2.83 eV). The photocatalytic activity was carefully evaluated with respect to RhB photodegradation in di?erent conditions such as light source and reaction time. The experimental results showed that the degradation rate of 3D ?ower-like Fe-Bi2O3 is up to 82% under visible light irradiation, when EtOH/H2O volume ratio and Bi/Fe molar ratio are 7:3 and 20:1, respectively.
关键词： Nanocomposites,Fe-Bi2O3,Sol-gel,Photocatalytic activity
更新于2025-09-23 15:23:52
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Magnetization and magnetic resonance in sol-gel derived polycrystalline BiFeO3 film
摘要： The structure and magnetic properties of polycrystalline BiFeO3 films grown on glass substrate using Sol-Gel technique have been investigated. X-ray diffraction (XRD) analysis revealed the average grain size of about 21 nm. The root mean square (RMS) surface roughness of about 50 nm has been obtained for the film by using scanning electron microscope (SEM) technique. Ferromagnetic resonance (FMR) studies showed the presence of macroscopic ferromagnetic magnetization and uniaxial out-of-plane magnetic anisotropy. The temperature dependences of the magnetization of BiFeO3 films registered in zero field cooling (ZFC) and field cooling (FC) regimes revealed a spin glass state. The average magnetic crystallite sizes obtained from the magnetizations studies coincide with the values revealed from the structural studies.
关键词： sol-gel technique,magnetic properties,magnetic materials,multiferroics
更新于2025-09-23 15:23:52