Hwang Eunseo, Park Yoonsu, Kim Jongbae, Paik Taejong, Ha Don-Hyung
School of Integrative Engineering, Chung-Ang University, Seoul 06974, Korea.
Nanomaterials (Basel). 2021 Sep 6;11(9):2317. doi: 10.3390/nano11092317.
The sulfurization reaction was investigated as a promising fabrication method for preparing metal sulfide nanomaterials. Traditional sulfurization processes generally require high vacuum systems, high reaction temperatures, and toxic chemicals, utilizing complicated procedures with poor composition and morphology controllability. Herein, a facile method is reported for synthesizing nanostructured copper sulfide using a sulfurization reaction with NaS at room temperature under non-vacuum conditions. Moreover, we demonstrate that the morphology, composition, and optical properties of nanostructured copper sulfides could be controlled by the NaS solution concentration and the reaction time. Nanostructured copper sulfides were synthesized in nanospheres, nanoplates, and nanoplate-based complex morphologies with various oxidation states. Furthermore, by comparing the optical properties of nanostructured copper sulfides with different oxidation states, we determined that reflectivity in the near infrared (NIR) region decreases with increasing oxidation states. These results reveal that the NaS solution concentration and reaction time are key factors for designing nanostructured copper sulfides, providing new insights for synthesis methods of metal sulfide nanomaterials.
硫化反应作为一种制备金属硫化物纳米材料的有前景的制造方法而被研究。传统的硫化过程通常需要高真空系统、高反应温度和有毒化学物质，采用的程序复杂，且成分和形态可控性差。在此，报道了一种在非真空条件下于室温使用硫化钠进行硫化反应合成纳米结构硫化铜的简便方法。此外，我们证明了纳米结构硫化铜的形态、成分和光学性质可通过硫化钠溶液浓度和反应时间来控制。纳米结构硫化铜以纳米球、纳米片以及具有各种氧化态的基于纳米片的复杂形态合成。此外，通过比较不同氧化态的纳米结构硫化铜的光学性质，我们确定近红外（NIR）区域的反射率随氧化态增加而降低。这些结果表明，硫化钠溶液浓度和反应时间是设计纳米结构硫化铜的关键因素，为金属硫化物纳米材料的合成方法提供了新的见解。
