摘要液相激光烧蚀（Laser Ablation in Liquid，LAL）是一种简单、绿色的技术，通常只需在水中或有机液相条件下进行。近年来，LAL已被用于制备一系列具有特殊形貌、微观结构、物相的纳米材料，以及在探索新的，在光学、显示、探测、生物等领域的性能和应用中，实现了功能化纳米材料的一步制备。由于LAL的特殊性质，所得到的纳米结构的应用和前景都引起了广泛关注。

作为过渡金属氧化物，钼氧化物材料拥有独特的吸引力，其丰富的化学价态使其应用领域十分广泛。氧化钼在电池电极材料、催化剂、传感器、电致变色等方面都具有广泛的应用前景。纳米级氧化钼因其优异的特性和广泛的用途，更是吸引了众多科研工作者的兴趣与关注，成为材料研究的热点。87813

本文结合了液相激光烧蚀与水热合成法，成功制备了氧化钼纳米材料。并且通过延长烧蚀时间，实现了氧化钼产物的相结构从六方相MoO2到正交相MoO3，形貌从球形到纳米片的调控。通过增加液相介质中H2O2的含量，实现了氧化钼产物的相结构从六方相MoO2到单斜相MoO2，形貌从球形到胶囊状的调控。并且在所制备的MoO2纳米颗粒的吸收光谱中观察到了近红外范围内的吸收峰。通过改变分散液的折射率，证实了二氧化钼纳米颗粒具有近红外波段的局域表面等离子体共振（LSPRs）特性，这一发现具有重大意义。

毕业论文关键词：液相激光烧蚀，纳米材料，氧化钼，局域表面等离子体共振

毕业设计说明书外文摘要

Title  Fabrication of Low-dimensional Molybdenum Oxide  Nanomaterials via Laser Ablation in Liquid                   

Abstract Laser ablation in liquid (LAL) is a simple and green technique that generally operates in water or organic liquids under ambient conditions。 In recent years, the LAL has been developed to prepare a series of nanomaterials with special morphologies, structures and phases, and to achieve one-step formation of various functionalized nanostructures in the pursuit of novel properties and applications in optics, display, detection, and biological fields。 The applications and prospects of as-prepared nanostructures have attracted extensive attention due to the special properties of LAL。 

As a transition metal oxide, molybdenum oxide materials have a unique appeal and very extensive application fields attributed to its rich chemical valence。 Molybdenum oxide materials have wide application prospects in many fields including battery electrode materials, catalysts, sensors and electrochromic devices。 Nanosized molybdenum oxide materials, which possess excellent properties and wide applications, further attract many researchers’ interests and attentions, have become a hot spot of material research。

Here, a combination of laser ablation in liquid and hydrothermal synthesis method was adopted to prepare the molybdenum oxide nanomaterials。 By extending the ablation time, the phase structures of obtained molybdenum oxide products can be tuned from hexagonal MoO2 to orthorhombic MoO3, and the morphologies from spheres to nanosheets。 By increasing the volume of H2O2 in the liquid medium, the phase structures of obtained molybdenum oxide products can be tuned from hexagonal MoO2 to monoclinic MoO2, and the morphologies from spheres to capsules。 And an absorption peak in the near-infrared range was observed in the absorption spectra of prepared molybdenum dioxide nanoparticles。 By changing the refractive index of dispersing agents, confirmed that the prepared molybdenum dioxide nanoparticles can exhibit localized surface plasmon resonances (LSPRs) in the near-infrared range, this finding is of great significance。

Keywords：laser ablation in liquid（LAL）, nanomaterials, molybdenum oxide, localized surface plasmon resonance（LSPR）