Zumeta-Dubé Inti, García Rangel José Manuel, Roque Jorge, Romero-Ibarra Issis Claudette, García Sánchez Mario Fidel
Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaria, CDMX, Legaria 694, Col. Irrigación, 11500, Miguel Hidalgo, Mexico.
Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Instituto Politécnico Nacional, Av. I.P.N. 2580, Gustavo A. Madero, 07340, Mexico, Mexico.
Sci Rep. 2021 Jan 21;11(1):2006. doi: 10.1038/s41598-021-81353-x.
The strong facet-dependent performance of glass-supported CeO thin films in different applications (catalysis, smart windows, etc.) has been the target of diverse fundamental and technological approaches. However, the design of accurate, cost-effective and scalable methods with the potential for large-area coverage that produce highly textured glass-supported CeO thin films remains a technological challenge. In the present work, it is demonstrated that under proper tuning conditions, the ultrasonic spray pyrolysis technique enables one to obtain glass-supported polycrystalline CeO films with noticeable texture along both the (100) and (111) directions, as well as with randomly oriented crystallites (no texture). The influence of flow rates, solution molarity, and substrate temperature on the texture and morphological characteristics, as well as optical absorption and Raman response of the deposited films, is evaluated. The obtained results are discussed on the basis of the combined dependence of the CeO-exposed surfaces on the thermodynamic stability of the corresponding facets and the reaction kinetics, which modulate the crystallite growth direction.
玻璃支撑的CeO薄膜在不同应用（催化、智能窗户等）中表现出强烈的面依赖性能，这一直是各种基础和技术方法的研究目标。然而，设计出准确、经济高效且可扩展的方法，使其有可能大面积覆盖并制备出具有高度织构的玻璃支撑CeO薄膜，仍然是一项技术挑战。在本工作中，结果表明，在适当的调节条件下，超声喷雾热解技术能够使人们获得沿（100）和（111）方向具有明显织构以及具有随机取向微晶（无织构）的玻璃支撑多晶CeO薄膜。评估了流速、溶液摩尔浓度和衬底温度对沉积薄膜的织构和形态特征以及光学吸收和拉曼响应的影响。基于CeO暴露表面对相应晶面热力学稳定性和反应动力学的综合依赖性对所得结果进行了讨论，这两者共同调节微晶的生长方向。
