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频率飞秒激光合成生成各种纳米结构，该纳米结构由具有独特的空间结构或稀有相的各种材料制成，这些纳米结构难以通过任何其他方式合成。这些纳米材料潜在的独特特性，并在各个领域（包括生物传感，纳米医学和能量转化）保持着很高的希望。当前的提案是根据这些最新发现和旨在创建新材料和探索可能应用的旨在的。该计划将集中在三个方向上： （1）从拉曼休眠材料中创建和开发高度拉曼活性纳米结构。不同形式的纳米结构（例如纳米植物，纳米纤维和纳米纤维）将从各种材料（包括玻璃和钛固体）中合成。这些非惯性表面增强的拉曼光谱（SERS）材料将用作具有提高灵敏度的化学/生物传感器。 2）研究纳米材料作为癌症治疗的医学。该研究计划的目标之一是介绍用于癌症治疗的“合成纳米结构材料”的概念。我们将研究致命细胞系与药物和无药剂方法中的纳米结构材料之间的相互作用。我的研究小组报道说，通过飞秒激光消融合成的氧化氧化硅，氧化物和氧化钛的纳米结构具有独特的形态学，晶体取向和相（某些相（某些阶段）（以前从未报道过），并且它们降低了癌细胞粘附，降低了癌细胞粘附，促进了方向性的靶向细胞，但没有健康的癌细胞，但没有健康的fibrost细胞。该研究计划将研究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地靶向癌细胞而无需使用细胞选择性传说的纳米医学。 3）研究和演示全光谱光子（阳光）抽象的纳米分解。通过飞秒激光合成方法，可以对纳米结构材料的吸收性特性进行精确控制和调整。与现有的光伏现有纳米结构相比，颗粒聚集的3D纳米结构和网络等众多材料的纳米纤维结构和硅的非晶/氧化薄膜具有竞争性抽象率。该研究计划将重点关注基于氧化钛基的纳米颗粒和纳米纤维结构的精确光学调整，以使太阳能光谱的近乎红外辐射进行，并旨在致力于设计和制造新的太阳能电池，其中这种纳米材料的整合是可行的。这将有助于寻找在已经存在的太阳能设备中实施纳米化的方法。