Group 14 Nanomaterials and Nanoengineered Hybrids - Design, Synthesis, Properties, and Applications.

第 14 组纳米材料和纳米工程杂化材料 - 设计、合成、性能和应用。

• 批准号: RGPIN-2015-03896
• 负责人: Veinot, Jonathan
• 金额: $ 6.48万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=692373
• 关键词: Group; 14; Nanomaterials; Nanoengineered; Hybrids

Semiconductor nanoparticles, or quantum dots (QDs) were first reported approximately thirty years ago. At that time it was difficult to foresee that they would provide the basis for what has become an important cross-disciplinary research area with far reaching impact in energy production and storage, efficient electronic devices, medical diagnostics, among others. To date, the most widely studied QDs are based upon CdSe; the size dependent properties of these materials are largely understood. Despite the obvious societal benefits afforded by their exquisitely tuneable properties and practical applications, the cytotoxicity of cadmium cannot be ignored and governments are moving to restrict their use.***Clearly, the demonstrated utility of QDs and their potential for dramatically impacting many aspects of modern society make them very attractive materials to pursue. In this context, there is a concerted effort to develop non-toxic QDs based upon abundant materials and establish an understanding of the parameters that impact their properties. Silicon (Si) and germanium (Ge) are attractive CdSe alternatives - both are semiconductors and Si is the second most abundant element in the earth's crust. However, their reactivity, electronic structure, and optical response differ substantially from that of CdSe. In fact, it is only recently that convenient methods for preparing SiQDs were developed and preparation of well-defined GeQDs remains elusive. In addition, interfacing these high surface area materials with their surroundings is an important outstanding challenge - the jury is still out on how best to tailor Si and Ge QD surface chemistry. Furthermore, important questions remain related to how and why surface groups influence the properties of these systems. These issues must be addressed if these non-toxic nanomaterials are to realize their full potential and society is to benefit.***The present research program targets the development of methods for preparing and tailoring the surface chemistry of Si and Ge QDs. More importantly, we aim to establish a firm understanding of the factors that influence their material properties which will lead to advances in a variety of impactful practical applications (e.g., solar cells, rechargeable batteries, sensors, thermoelectric devices, and imaging agents). With this new insight in hand, advanced nanoengineered hybrids that marry the properties of quantum dots and polymers will be designed, synthesized, and investigated.**

大约三十年前首次报道了半导体纳米颗粒或量子点 (QD)。 当时很难预见它们将为一个重要的跨学科研究领域提供基础，并对能源生产和存储、高效电子设备、医疗诊断等产生深远影响。迄今为止，研究最广泛的量子点是基于 CdSe 的。这些材料的尺寸依赖性特性已被广泛了解。尽管其精细可调的特性和实际应用带来了明显的社会效益，但镉的细胞毒性不容忽视，各国政府正在采取行动限制其使用。***显然，量子点的实用性及其对许多方面产生巨大影响的潜力现代社会使它们成为非常有吸引力的追求材料。 在此背景下，人们共同努力开发基于丰富材料的无毒量子点，并建立对影响其性能的参数的理解。 硅 (Si) 和锗 (Ge) 是颇具吸引力的 CdSe 替代品 - 两者都是半导体，而硅是地壳中第二丰富的元素。然而，它们的反应性、电子结构和光学响应与 CdSe 有很大不同。事实上，直到最近才开发出制备 SiQD 的便捷方法，而制备明确的 GeQD 仍然难以实现。此外，将这些高表面积材料与其周围环境连接起来是一个重要的、突出的挑战——对于如何最好地定制硅和锗量子点表面化学，目前还没有定论。此外，重要的问题仍然与表面基团如何以及为何影响这些系统的特性有关。如果这些无毒纳米材料要充分发挥其潜力并使社会受益，就必须解决这些问题。***本研究计划的目标是开发用于制备和定制硅和锗量子点表面化学的方法。更重要的是，我们的目标是对影响其材料性能的因素有一个深入的了解，这将促进各种有影响力的实际应用（例如太阳能电池、可充电电池、传感器、热电设备和成像剂）的进步。有了这一新的见解，将设计、合成和研究结合了量子点和聚合物特性的先进纳米工程混合材料。**