Tanaka Yoshiki, Yu Xi, Terakawa Shusaku, Ishida Takafumi, Saitoh Koh, Zhang Hongwei, Asaka Toru, Itoigawa Fumihiro, Kuwahara Makoto, Ono Shingo
Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan.
Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan.
ACS Omega. 2023 Feb 13;8(8):7932-7939. doi: 10.1021/acsomega.2c07697. eCollection 2023 Feb 28.
Molybdenum carbides (MoC and MoC) are being reported for various applications, for example, catalysts for sustainable energies, nonlinear materials for laser applications, protective coatings for improving tribological performance, and so on. A one-step method for simultaneously fabricating molybdenum monocarbide (MoC) nanoparticles (NPs) and MoC surfaces with a laser-induced periodic surface structure (LIPSS) was developed by using pulsed laser ablation of a molybdenum (Mo) substrate in hexane. Spherical NPs with an average diameter of 61 nm were observed by scanning electron microscopy. The X-ray diffraction pattern and electron diffraction (ED) pattern results indicate that a face-centered cubic MoC was successfully synthesized for the NPs and on the laser-irradiated area. Notably, the ED pattern suggests that the observed NPs are nanosized single crystals, and a carbon shell was observed on the surface of MoC NPs. The X-ray diffraction pattern of both MoC NPs and LIPSS surface indicates the formation of FCC MoC, agreeing with the results of ED. The results of X-ray photoelectron spectroscopy also showed the bonding energy attributed to Mo-C, and the sp-sp transition was confirmed on the LIPSS surface. The results of Raman spectroscopy have also supported the formation of MoC and amorphous carbon structures. This simple synthesis method for MoC may provide new possibilities for preparing Mo C-based devices and nanomaterials, which may contribute to the development of catalytic, photonic, and tribological fields.
碳化钼（MoC 和 Mo₂C）正被报道用于各种应用，例如，可持续能源的催化剂、激光应用的非线性材料、用于改善摩擦学性能的防护涂层等等。通过在己烷中对钼（Mo）衬底进行脉冲激光烧蚀，开发了一种同时制备单碳化钼（MoC）纳米颗粒（NPs）和具有激光诱导周期性表面结构（LIPSS）的 Mo₂C 表面的一步法。通过扫描电子显微镜观察到平均直径为 61 nm 的球形 NPs。X 射线衍射图谱和电子衍射（ED）图谱结果表明，在 NPs 和激光辐照区域成功合成了面心立方 MoC。值得注意的是，ED 图谱表明观察到的 NPs 是纳米尺寸的单晶，并且在 MoC NPs 的表面观察到了碳壳。MoC NPs 和 LIPSS 表面的 X 射线衍射图谱均表明形成了 FCC MoC，与 ED 结果一致。X 射线光电子能谱结果还显示了归因于 Mo-C 的结合能，并且在 LIPSS 表面证实了 sp-sp 跃迁。拉曼光谱结果也支持了 MoC 和非晶碳结构的形成。这种简单的 MoC 合成方法可能为制备基于 MoC 的器件和纳米材料提供新的可能性，这可能有助于催化、光子和摩擦学领域的发展。
