Fan Hualin, Yan Wei, Ding Yicheng, Bao Zhihao
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China.
Nanoscale Res Lett. 2020 Nov 23;15(1):218. doi: 10.1186/s11671-020-03450-6.
Flame spray pyrolysis was a process to produce oxide nanoparticles in a self-sustaining flame. When the produced nanoparticles were deposited on a substrate, nanostructured oxide thin films could be obtained. However, the size of the thin film was usually limited by the fixed substrate. Here, we demonstrated that thin film with a large area could be deposited by using the moving substrate, which was precisely controlled by servo motors. As a result, the flame tip could scan over the substrate and deposit the nanoparticles on it line by line, analogues to a printing process called flame-assisted printing (FAP). As an example, nanostructured bismuth-oxide thin films with a size of up to 20 cm × 20 cm were deposited with the FAP process. The bismuth-oxide thin film exhibited a stable electrochromic property with a high modulation of 70.5%. The excellent performance could be ascribed to its porous nanostructure formed in the FAP process. The process can be extended to deposit other various oxides (e.g., tungsten-oxide) thin films with a large size for versatile applications.
火焰喷雾热解是一种在自持火焰中生产氧化物纳米颗粒的过程。当所生产的纳米颗粒沉积在基底上时，可获得纳米结构的氧化物薄膜。然而，薄膜的尺寸通常受固定基底的限制。在此，我们证明了通过使用由伺服电机精确控制的移动基底可以沉积大面积的薄膜。结果，火焰尖端可以扫描基底并逐行将纳米颗粒沉积在其上，类似于一种称为火焰辅助印刷（FAP）的印刷过程。例如，采用FAP工艺沉积了尺寸达20 cm×20 cm的纳米结构氧化铋薄膜。该氧化铋薄膜表现出稳定的电致变色性能，调制率高达70.5%。优异的性能可归因于其在FAP过程中形成的多孔纳米结构。该工艺可扩展用于沉积其他各种大尺寸氧化物（如氧化钨）薄膜，以实现多种应用。
