摘要
红外吸收光谱是探测和鉴定分子的有效工具,然而其应用受到分子低红外吸收截面的限制.金属或高掺杂半导体纳米材料的局域表面等离激元能够产生极大的局域电磁场增强.当分子红外振动与局域表面等离激元发生耦合共振时,分子的振动信号会被极大增强,可实现对目标分子的微量甚至痕量检测.由于其在化学、生物和医药等方面的巨大应用前景,近年来局域表面等离激元增强红外吸收引起了人们的广泛关注.本文首先介绍了表面等离激元增强红外吸收效应的产生机理和理论模型,在此基础上重点讨论了几类不同结构和组分的可实现表面等离激元增强红外吸收的纳米材料的制备方法和增强效果,最后总结了该效应在光谱成像、生物分子检测、环境污染物监测和气体检测等诸多方面的重要应用.
Infrared spectroscopy is a powerful tool for the detection and identification of molecules.However,its application is limited by the low infrared absorption cross-sections of molecules.Localized surface plasmon resonances in metal and highly-doped semiconductor nanomaterials can produce large localized electromagnetic field enhancements.When molecular vibrations are in resonance with localized surface plasmon resonances,molecular vibrations are able to be largely amplified.The detection of minute amounts of target molecules can be realized in this way.Surface-enhanced infrared absorption(SEIRA)spectroscopy has recently attracted extensive attention owing to its enormous potential in molecular detection in chemistry,biology and medicine.In this review article,the enhancement mechanism and theoretical models of SEIRA are first introduced.The preparation methods and enhancement effects of various infraredresponsive nanomaterials are then discussed.The applications of SEIRA in diverse areas,such as hyperspectral infrared chemical imaging,detection of biomolecules,monitoring of pollutants in the environment,and on-chip gas sensing,are finally summarized.
作者
李楠楠
章瀚
王建方
LI NanNan;ZHANG Han;WANG JianFang(Department of Physics,The Chinese University of Hong Kong,Hong Kong 999077,China)
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2019年第12期26-39,共14页
Scientia Sinica Physica,Mechanica & Astronomica
基金
香港研究资助局优配研究基金(编号:14306817)资助项目
关键词
金属纳米颗粒
局域表面等离激元
表面增强红外吸收
等离激元-振动耦合
metal nanomaterials
localized surface plasmon resonance
surface-enhanced infrared absorption
plasmonvibration coupling
