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Synthesis and characterization of silver vanadates thin films for photocatalytic applications
Catalysis Today ( IF 5.3 ) Pub Date : 2017-09-06 , DOI: 10.1016/j.cattod.2017.09.007
F. Gonzalez-Zavala , L. Escobar-Alarcón , D.A. Solís-Casados , M. Espinosa-Pesqueira , E. Haro-Poniatowski , E. Rodríguez-Castellón , E. Rodríguez-Aguado

Silver vanadates thin films were deposited by a hybrid deposition system combining laser ablation and thermal evaporation. A high purity vanadium target was ablated using the third harmonic of a Nd:YAG laser whereas high purity silver pellets were evaporated. The as-deposited thin films were subjected to thermal treatments at 400 °C to obtain crystalline films. For films without Ag amorphous V2O5 thin films were deposited and as the Ag is incorporated in the material different silver vanadates were obtained. The effect of the silver load on the composition, structure, optical properties, surface morphology and photocatalytic response of the deposited films was studied. The film composition, determined by X-ray photoelectron spectroscopy, reveals Ag contents from 5.5 to 18.9 at.%. The crystalline phases formed were identified by micro-Raman Spectroscopy; the results indicate the formation of three silver vanadates depending on the silver content. The morphology was observed using scanning electron microscopy, the filḿs surface changes from a smooth surface to belts covering the surface and finally Ag nanoparticles are observed at the higher Ag contens. Optical properties determined from UV–vis reveal the presence of the surface plasmon signal in films containing silver. The films were tested in the photocatalytic degradation of Malachite Green dye reaching maximum degradations degrees close to 53% under solar irradiation. Reactive species trapping experiments suggest that O2 produced by the O2 reduction via the photogenerated electrons drives the photodegradation mechanism.



中文翻译:

用于光催化的钒酸银薄膜的合成与表征

钒酸银薄膜是通过结合激光烧蚀和热蒸发的混合沉积系统沉积的。使用Nd:YAG激光的三次谐波烧蚀高纯度钒靶,同时蒸发高纯度银粒。将沉积的薄膜在400℃下进行热处理以获得结晶膜。用于无Ag非晶态V 2 O 5的薄膜沉积薄膜,并且当将Ag掺入材料中时,获得了不同的钒酸银。研究了银载量对沉积膜的组成,结构,光学性质,表面形态和光催化响应的影响。通过X射线光电子能谱测定的膜组成表明Ag含量为5.5-18.9at。%。通过显微拉曼光谱法鉴定所形成的结晶相。结果表明,取决于银含量,会形成三种钒酸银。使用扫描电子显微镜观察形态,纤维表面从光滑的表面变为覆盖表面的带,最后在较高的Ag含量下观察到Ag纳米颗粒。由紫外可见光谱测定的光学性质揭示了含银薄膜中存在表面等离子体激元信号。在日光照射下,对孔雀石绿染料的光催化降解达到接近53%的最大降解度进行了测试。反应性物种捕获实验表明,O2 -由O产生2经由光生电子驱动器减少光降解机制。

更新日期:2017-09-06
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