Choi Yun-Hyuk
School of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan 38430, Korea.
Materials (Basel). 2022 Mar 16;15(6):2182. doi: 10.3390/ma15062182.
In this study, the advanced chemical vapor transport (CVT) method in combination with the quenching effect is introduced for creating molybdenum oxide nanoparticle arrays, composed of the hierarchical structure of fine nanoparticles (NPs), which are vertically grown with a homogeneous coverage on the individual carbon fibers of carbon fiber paper (CFP) substrates. The obtained molybdenum oxide NPs hold a metastable high-temperature γ-MoO phase along with a stable α-MoO phase by the quenching effect. Furthermore, such a quenching effect forms thinner and smaller nanoparticle aggregates by suppressing the growth and coalescence of primary particles. The molybdenum oxide nanoparticle aggregates are prepared using two different types of precursors: MoO and a 1:1 (mol/mol) mixture of MoO and activated carbon. The results characterized using X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy show that the relative amount of α-MoO to γ-MoO within the prepared NPs is dependent on the precursor type; a lower amount of α-MoO to γ-MoO is obtained in the NPs prepared using the mixed precursor of MoO and carbon. This processing-structure landscape study can serve as the groundwork for the development of high-performance nanomaterials in various electronic and catalytic applications.
在本研究中，引入了先进的化学气相传输（CVT）方法并结合猝灭效应来制备氧化钼纳米颗粒阵列，该阵列由精细纳米颗粒（NPs）的分层结构组成，这些纳米颗粒在碳纤维纸（CFP）基底的单根碳纤维上垂直生长且覆盖均匀。通过猝灭效应，所获得的氧化钼纳米颗粒同时包含亚稳态的高温γ-MoO相和稳定的α-MoO相。此外，这种猝灭效应通过抑制初级颗粒的生长和聚结形成了更薄且更小的纳米颗粒聚集体。氧化钼纳米颗粒聚集体使用两种不同类型的前驱体制备：MoO以及MoO与活性炭的1:1（摩尔/摩尔）混合物。使用X射线衍射、拉曼光谱、X射线光电子能谱和傅里叶变换红外光谱进行表征的结果表明，制备的纳米颗粒中α-MoO与γ-MoO的相对含量取决于前驱体类型；在使用MoO与碳的混合前驱体制备的纳米颗粒中，α-MoO与γ-MoO的含量较低。这种加工-结构关系研究可为各种电子和催化应用中高性能纳米材料的开发奠定基础。
