Wang Zhenyu, Ding Haizhen, Liu Xuefeng, Zhao Jing
School of Ocean Science and Technology, Dalian University of Technology, Panjin 124221, China.
School of Life Science and Medicine, Dalian University of Technology, Panjin 124221, China.
Nanomaterials (Basel). 2023 Aug 9;13(16):2289. doi: 10.3390/nano13162289.
Semiconductor oxide gas sensors have important applications in environmental protection, domestic health, and other fields. Research has shown that designing the morphology of sensitive materials can effectively improve the sensing characteristics of sensors. In this paper, by controlling the solvothermal reaction time, a unique hexagonal flower-like structure of InO materials consisting of cuboid nanorods with a side length of 100-300 nm was prepared. The characterization results indicated that with the increase in reaction time, the materials exhibited significant morphological evolution. When the solvent heating time is 5 h, the flower-like structure is basically composed of hexagonal nanosheets with a thickness of several hundred nanometers and a side length of several micrometers. With the increase in reaction time, the apex angles of the nano sheets gradually become obtuse, and, finally, with the Ostwald ripening process, they become cuboid nanorods with side lengths of 100-300 nanometers, forming unique micro-flowers. Among them, the material prepared with a reaction time of 20 h has good sensing performance for NO, exhibiting low operating temperature and detection limit, good selectivity, repeatability, and long-term stability, thus suggesting a good application prospect.
半导体氧化物气体传感器在环境保护、家庭健康等领域有着重要应用。研究表明，设计敏感材料的形貌能够有效改善传感器的传感特性。本文通过控制溶剂热反应时间，制备出了由边长为100 - 300 nm的长方体纳米棒组成的独特的六方花状结构的InO材料。表征结果表明，随着反应时间的增加，材料呈现出显著的形貌演变。当溶剂热反应时间为5 h时，花状结构基本由厚度为几百纳米、边长为几微米的六方纳米片组成。随着反应时间的增加，纳米片的顶角逐渐变钝，最终，随着奥斯特瓦尔德熟化过程，它们变成边长为100 - 300纳米的长方体纳米棒，形成独特的微花结构。其中，反应时间为20 h制备的材料对NO具有良好的传感性能，表现出低工作温度和检测限、良好的选择性、重复性以及长期稳定性，因此具有良好的应用前景。
