Kim Kyung-Hwan, Lee Do Kyung, Choi Yun-Hyuk
School of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan 38430, Gyeongbuk, Korea.
Materials (Basel). 2021 Apr 30;14(9):2338. doi: 10.3390/ma14092338.
Here, single-phase MnO and MnO films are successfully fabricated by a facile solution process based on metal-organic decomposition (MOD), for the first time. A formulated manganese 2-ethylhexanoate solution was used as an MOD precursor for the preparation of manganese oxide films. The difference in thermal decomposition behavior of precursor solution in air and inert atmospheres was observed, indicating that the calcination atmosphere is the main factor for controlling the valence of manganese oxide films. Significantly, the solution-coated films on substrates are found to be transformed into single-phase MnO and MnO films when they are calcinated under air and inert atmosphere, respectively. The film crystallinity was improved with increasing calcination temperature for both MnO and MnO films. In particular, it is noted that the grains of MnO film were somewhat linearly grown in air, while those of MnO film exhibited the drastic growth in Ar with an increase of calcination temperature.
在此，首次通过基于金属有机分解（MOD）的简便溶液法成功制备了单相MnO和MnO薄膜。一种配制好的2-乙基己酸锰溶液被用作制备氧化锰薄膜的MOD前驱体。观察到前驱体溶液在空气和惰性气氛中的热分解行为存在差异，这表明煅烧气氛是控制氧化锰薄膜价态的主要因素。值得注意的是，发现当在空气和惰性气氛中分别煅烧时，基板上溶液涂覆的薄膜会转变为单相MnO和MnO薄膜。对于MnO和MnO薄膜，随着煅烧温度的升高，薄膜结晶度均得到改善。特别要指出的是，MnO薄膜的晶粒在空气中呈一定程度的线性生长，而MnO薄膜的晶粒在氩气中随着煅烧温度的升高呈现出急剧生长。
