Femtosecond pulsed laser synthesis of functional nanomaterials and their applications

MHz频率的飞秒激光合成产生了各种材料的纳米结构，这些材料具有独特的空间结构或稀有的相，这是其他任何方法都难以合成的。这些纳米材料具有独特的性能，在生物传感、纳米医学和能量转换等领域具有很高的应用前景。目前的提案是在这些最新发现的基础上发展起来的，旨在创造新材料并探索可能的应用。该计划将集中在三个方向：***(1)从拉曼休眠材料中创建和开发高拉曼活性纳米结构。不同形式的纳米结构，如纳米尖端、纳米网络和纳米纤维将由各种材料合成，包括玻璃和固体钛。这些非传统的表面增强拉曼光谱（SERS）材料将用作化学/生物传感器，具有更高的灵敏度。***2)纳米材料在癌症治疗中的应用研究。这项研究计划的目标之一是引入“合成纳米结构材料”的概念，用于癌症治疗。我们将研究致命细胞系和合成的纳米结构材料之间的相互作用，在药物和无剂的方法。我课课组报道了飞秒激光烧蚀合成的氧化硅、氧化镍和氧化钛的纳米结构具有独特的形貌、晶体取向和相（有些相以前从未报道过），可以降低癌细胞粘附，促进细胞定向增殖，选择性靶向癌细胞而非健康成纤维细胞。该研究项目将研究这些材料在改变癌细胞骨架行为方面的影响，目的是开发出能够在不使用细胞选择性图例的情况下识别和选择性靶向癌细胞的纳米药物。***3)全光谱光子（阳光）吸收纳米结构的研究与演示。通过飞秒激光合成方法，可以精确控制和剪裁纳米结构材料的吸收特性，以用于太阳能电池的制造。与现有的光伏纳米结构相比，颗粒聚集的3D纳米结构和网状纳米纤维结构的许多材料具有可控的环形尺寸簇和非晶化/氧化硅薄膜，具有竞争性的吸收率。该研究项目将专注于氧化钛纳米颗粒和纳米纤维结构的精确光学调谐，以适应太阳光谱的近红外辐射，并致力于设计和制造新型太阳能电池，在这种纳米材料的集成是可行的。这将有助于找到在现有太阳能设备中实现纳米制造的方法

MHz frequency femtosecond laser synthesis generates a wide range of nanostructures made of various materials with unique spatial structure or rare phases that are hard to synthesize by any other means. These nanomaterials possess unique properties and hold high promise in various fields, including biosensing, nanomedicine and energy conversion. The current proposal is developed on these recent findings and aims at creating new materials and exploring possible applications. This program will concentrate in three directions: ***(1) creation and development of highly Raman active nanostructures from Raman dormant materials. Different forms of nanostructures such as nanotips, nanonetworks and nanofibers will be synthesized from various materials, including glass and Titanium solid. These non-conventional surface enhanced Raman spectroscopy (SERS) materials will be used as chemical/bio sensors with increased sensitivity. ***2) investigation of nanomaterials as medicine for cancer therapy. One of the objectives of this research program is to introduce the concept of “as synthesized nanostructured materials” for cancer therapy. We will investigate interactions between fatal cell lines and as-synthesized nanostructured materials in a medicine and agent free approach. My research group reported that nanostructure of silicon oxides, nickle oxides and titanium oxides synthized via femtosecond laser ablation has unique morphology, crystal orientation and phases (some phases have never been reported before) and they reduced cancer cell adhesion, promoted directional cell proliferation and selectively targeted cancer cells but not healthy fibroblast cells. This research program will investigate the influence of these materials in altering cancer cell cytoskeleton behaviour with an aim to develop nanomedicines able to identify and selectively target cancer cells without the use of cell selective legends.***3) investigation and demonstration of nansotructures for full spectrum photonic (sunlight) absorption. Precise control and tailoring of the absorptive properties of nanostructured materials for potential use in solar cell fabrication is possible through femtosecond laser synthesis method. Particle agglomerated 3D nanostructures and web like nano fibrous structures of numerous materials with controlled ring size clusters and amorphorized/oxidized thin films of silicon have exhibited competitive absorption rates when compared to existing nanostructures for photovoltaics. This research program will focus on the precise optical tuning of titanium oxide based nanoparticles and nanofibrous structures to near infrared radiation of the solar spectrum and aims to work towards the design and fabrication of new solar cells, where the integration of such nanomaterials is viable. This will aid in finding ways to implement nanofabrication in already existing solar devices.**