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Advanced Coating Materials || Anodic Oxide Nanostructures: Theories of Anodic Nanostructure Self-Organization
摘要： This chapter reviews the morphologies, growth kinetics, and theories of growth kinetics of anodic oxide films. Experimentally, it is possible to control the growth conditions of these films to yield several distinct morphologies, including orderly arranged nanoporous and nanotubular films. Fundamental processes that lead to self-ordering of nanoscale features, including interfacial reactions, ionic transport, stress generation, and space charge accumulation, are discussed. Various theories are included to explain the growth mechanism of oxide film.
关键词： barrier film,Anodic oxide film,porous film,EIS,anodization
更新于2025-09-23 15:23:52
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Preparation of Highly Oriented Porous LiCoO2 Crystal Films via Li-Vapor Crystal Growth Method
摘要： To construct better Li-ion-based batteries, highly oriented porous LiCoO2 crystal film is urgently needed for an active positive electrode. In this study, we prepared such a crystal film via the Li-vapor crystal growth method, which involves a simple reaction between the CoO substrate and Li-vapor. Highly crystalline LiCoO2 particles 2–3 μm in size were grown on the CoO substrate surface with strong relation of their orientation. The <110> and <018>-oriented LiCoO2 particles, which are preferable for Li-ion conduction, were generated on the CoO(110) substrate. On the CoO(111) substrate, LiCoO2 particles were grown with not only the <003> orientation but also the <012> orientation, suggesting that the crystal growth should follow the three-dimensional structure of the CoO and LiCoO2 lattice. Both the prepared LiCoO2 films from the CoO(110) and CoO(111) substrates exhibited stable and superior electrochemical properties for Li-ion battery cycling, indicating that the films will be useful for high-performance Li-ion-based batteries.
关键词： highly oriented porous film,LiCoO2 electrode,Li-vapor crystal growth,Li-ion batteries
更新于2025-09-23 15:21:01
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Oxygen Vacancies Enabled Porous SnO <sub/>2</sub> Thin Films for Highly Sensitive Detection of Triethylamine at Room Temperature
摘要： Detection of volatile organic compounds (VOCs) at room temperature (RT) currently remains a challenge for metal oxide semiconductor (MOS) gas sensors. Herein, we for the first time report on the utilization of porous SnO2 thin films for RT detection of VOCs by defect engineering of oxygen vacancies. The oxygen vacancies in the three-dimensional ordered SnO2 thin films, prepared by a colloidal template method, can be readily manipulated by thermal annealing at different temperatures. It is found that oxygen vacancies play an important role in the RT sensing performances, which successfully enables the sensor to respond to triethylamine (TEA) with an ultrahigh response, e.g. 150.5 to 10 ppm TEA in a highly selective manner. In addition, the sensor based on oxygen vacancy-rich SnO2 thin films delivers a fast response and recovery speed (53 and 120 s), which can be further shortened to 10 and 36 s by elevating the working temperature to 120 oC. Notably, a low detection limit of 110 ppb has been obtained under RT. The overall performances surpass most previous reports on TEA detection at RT. The outstanding sensing properties can be attributed to the porous structure with abundant oxygen vacancies, which can improve the adsorption of molecules. The oxygen vacancy engineering strategy and the on-chip fabrication of porous MOS thin film sensing layers deliver a great potential for create high-performance RT sensors.
关键词： Oxygen vacancy,Porous film,Gas sensor,Tin dioxide,Room temperature
更新于2025-09-23 15:19:57
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Preparation of Ni(OH)2/TiO2 porous film with novel structure and electrochromic property
摘要： Ni(OH)2/TiO2 nanorod composite porous film with a novel structure and remarkable electrochromic (EC) behavior was prepared on a fluorine doped tin oxide (F:SnO2; FTO) coated glass substrate by hydrothermal and solvothermal techniques. A pure Ni(OH)2 porous film was also prepared on another FTO substrate by the solvothermal technique for comparison. The growth process of Ni(OH)2 on the surface of TiO2 nanorod layer was investigated carefully. The component, morphology and microstructure of the films, as well as their EC performances including transmittance, cyclic voltammetry (CV), cycle life and response time were characterized. Compared with those of the pure Ni(OH)2 film, the EC performances of Ni(OH)2/TiO2 composite film have exhibited obvious enhancement owing to the good interface bonding, Ni(OH)2 porous structure, TiO2 nanorod layer and interpenetrating structure. Furthermore, it is noteworthy that the transmittance contrast in near infrared light area was distinctly improved, and even exceeded 95% after the 100th cycle, promising the Ni(OH)2/TiO2 nanorod composite porous film a potential EC application in near infrared light area in the future.
关键词： Composite porous film,Electrochromic property,Ni(OH)2/TiO2 nanorods,Solvothermal,Preparation
更新于2025-09-10 09:29:36