氧化钨纳米晶的等离子电致变色研究

Electrochromic technology has attracted considerable interest in recent times because of many important applications in energy-efficient buildings, display devices, aerospace, and so on. The coloration mechanism of conventional electrochromic materials is driven by Faradaic processes, that is, the double injection/extraction of electrons and ions upon reduction/oxidation, these materials typically show slow switching kinetics and limited cycle life. In this project, we will explore a novel coloration mechanism for electrochromic technology: Plasmonic Electrochromism. This mechanism is based on the modulation of localized surface plasmon resonance (LSPR) absorption in tungsten oxide nanocrystals by electrochemical charging or doping of nanocrystal films. The plasmonic nanocrystal electrochromic devices could confer NIR-selective operation, inherently rapid switching, and greatly enhanced durability. The study provides a new route to design novel electrochromic devices, and bring new vigor and vitality to the development of next-generation electrochromic technology.

电致变色技术在建筑节能、新型显示、航空航天等领域具有重要的应用前景。传统的电致变色技术的变色原理是基于法拉第过程，即通过氧化还原反应来实现电子和离子的注入与抽出，基于这一过程的电致变色材料的响应时间一般较慢，且离子的反复嵌入/脱出会加剧性能的衰减和失效。本项目拟借助于电子的电化学注入或抽出来动态地调节氧化钨纳米晶的表面等离子共振峰的位置和强度，从而实现纳米晶光吸收率或反射率的变化。这种基于非法拉第过程的新的电致变色模式不仅能赋予电致变色材料快速响应的特性和优异的循环稳定性，而且理论上能实现电致变色器件的多频、多波段选择性调制。该项研究对于下一代电致变色技术的设计及应用探索提供了一种全新的思路和途径。

电致变色技术在建筑节能、新型显示、航空航天等领域具有重要的应用前景，而纳米材料在电致变色领域的应用将为其发展带来新的机遇。本项目围绕氧化钨纳米晶及相关材料的电致变色性能开展研究，利用高温熔盐法、溶剂热法、磁控溅射法等方法制备出超细纳米线、纳米片、法布里-珀罗谐振腔等氧化钨纳米结构；发现氧化钨材料中层间结构水分子的存在能促进其近红外电致变色性能；通过法布里-珀罗谐振腔结构设计极大丰富氧化钨材料色彩，创制出多彩和双面神等多种新型氧化钨基电致变色器件，发展出原创性、标志性的无机多彩电致变色新技术。该项研究对于下一代电致变色技术的设计及应用探索提供了一种全新的思路和途径。