氧化钨量子点的LSPR效应调控及其光热转化行为研究

Localized surface plasma resonance (LSPR) that exists in heavily doped transition-metal composites endows certain semiconductor nanocrystals with strong absorption towards infrared spectrum and the ability of a rapid photo-to-thermal conversion. Such methods and materials show a charming application prospect in laser photothermal therapy, however, relative research work has just been initiated and materials involved are still confined within quite limited species. Tungsten oxide has a vast number of nonstoichiomechic analogues with various degrees of lattice defects, in which much higher free charge density can be maintained through simple doping, and thus becomes an ideal material for the study of LSPR generation and modulation. In this project, we will focus on the fabrication of new types of tungsten oxide quantum dots and the modulation of their infrared absorption. We will explore an effective way for controllable preparation of tungsten infrared quantum dots with modulated lattice defects, and investigate the relationship between free charge carrier density, quantum effect, biocompatible ligands and the behavior of LSPR and photothermal conversion. This study is valuable for promoting deep development of tungsten infrared quantum dot materials, also provides new strategies and new methods for the design and application of LSPR-functionalized semiconductors.

重掺杂过渡金属化合物中的“限域表面等离子共振”（LSPR）效应赋予此类半导体纳米晶强的近红外光谱吸收能力，并具备迅速将光能转化为热能的光热效应，在激光热疗领域展现出诱人的应用前景；然而，相关研究目前仍处于起步阶段，探索和研究的材料体系十分有限。钨系氧化物的最大特点是存在着多种非化学计量比，即具有不同程度晶格缺陷的稳定结构，通过掺杂等方式可以维持很高的自由电荷密度，是产生与调控LSPR效应的理想载体。本项目围绕氧化钨量子点的制备科学与近红外吸收光谱调制，深入研究氧化钨量子点的可控制备与晶格缺陷调制，深入理解材料自由电荷密度、量子尺寸效应和生物兼容型表面配体对LSPR行为以及光热转化效率的作用，为开发高效、安全的氧化钨近红外量子点光热转化材料奠定基础，并为LSPR半导体材料的设计与应用探索提供新的思路和途径。

重掺杂过渡金属化合物中的“限域表面等离子共振”效应（LSPR）赋予此类半导体纳米晶强的近红外光谱吸收能力，并具备迅速将光能转化为热能的光热效应，在激光热疗肿瘤领域展现出诱人的应用前景；然而，相关研究目前仍处于起步阶段，探索和研究的材料体系种类十分有限。钨系氧化物的最大特点是存在着多种非化学计量比，即具有不同程度晶格缺陷的稳定结构，通过掺杂等方式可以维持很高的自由电荷密度，是产生与调控LSPR的理想载体。本项目围绕氧化钨近红外量子点的制备科学与近红外吸收光谱调制，深入研究氧化钨量子点结构的可控制备与晶格缺陷调制，深入理解材料自由电荷密度、量子尺寸效应和生物兼容型表面配体对LSPR行为以及光热转化效率的作用关系，为开发高效、安全的氧化钨近红外量子点光热转化材料奠定基础，并对近红外氧化钨材料的全新光电应用进行了探索。