Femtosecond pulsed laser synthesis of functional nanomaterials and their applications

飞秒脉冲激光合成功能纳米材料及其应用

• 批准号: RGPIN-2016-05744
• 负责人: Tan, Bo
• 金额: $ 2.77万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=615879
• 关键词: Femtosecond; pulsed; laser; synthesis; functional

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.

MHz频率的飞秒激光合成产生了各种各样的纳米结构，这些纳米结构由各种具有独特空间结构或稀有相的材料制成，这些材料是任何其他方法都难以合成的。这些纳米材料具有独特的性质，在生物传感、纳米医学和能源转换等领域具有很高的应用前景。目前的提案是根据这些最新发现制定的，旨在创造新材料并探索可能的应用。这项计划将集中在三个方向： (1)利用拉曼休眠材料制备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，将从不同的材料中合成，包括玻璃和固体钛。这些非常规的表面增强拉曼光谱(SERS)材料将被用作灵敏度更高的化学/生物传感器。 2)纳米材料作为药物治疗癌症的研究。该研究项目的目标之一是介绍用于癌症治疗的“作为合成纳米结构材料”的概念。我们将以药物和无试剂的方法研究致命细胞系和合成的纳米结构材料之间的相互作用。我的研究小组报告说，通过飞秒激光烧蚀合成的二氧化硅、氧化镍和氧化钛的纳米结构具有独特的形貌、晶体取向和物相(有些相以前从未报道过)，它们减少了癌细胞的黏附，促进了细胞的定向增殖，并选择性地靶向癌细胞，而不是健康的成纤维细胞。这项研究计划将调查这些材料在改变癌细胞细胞骨架行为方面的影响，目的是开发能够识别和选择性靶向癌细胞的纳米药物，而不使用细胞选择传说。 3)全光谱光子(太阳光)吸收纳米结构的研究和演示。通过飞秒激光合成方法，可以精确控制和定制用于太阳能电池制造的纳米结构材料的吸收性能。与现有的光伏纳米结构相比，具有可控环尺寸的团簇和非晶化/氧化的硅薄膜的许多材料的颗粒团聚的3D纳米结构和网状纳米纤维结构具有竞争的吸收速率。这项研究计划将重点放在基于二氧化钛的纳米颗粒和纳米纤维结构对太阳光谱的近红外辐射的精确光学调节上，并致力于设计和制造新的太阳能电池，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上实施纳米制造的方法。