Surface-Enhanced Infrared Absorption Using Individual Cross Antennas Tailored to Chemical Moieties
Surface-Enhanced Infrared Absorption Using Individual Cross Antennas Tailored to Chemical Moieties
复制标题
DOI：
10.1021/ja312694g
复制
发表时间：
2013-03-06
影响因子：
15
通讯作者：
Halas, Naomi J.
中科院分区：
文献类型：
--
作者：
Brown, Lisa V.;Zhao, Ke;Halas, Naomi J.
表面增强红外吸收光谱(SEIRA)天线结构的发展是将红外光谱扩展到零摩尔量并最终扩展到单分子水平的一个强烈和日益感兴趣的话题。在这里，我们表明，使用传统的红外光谱源，单个金纳米天线可以获得强烈的红外光谱增强。天线的结构尺寸可以调节，以增强特定化学部分的红外模式。对天线结区电场强度的模拟表明，最大Seira增强因子大于12000。这些发现为利用广泛可获得的光源分析极少量分子的红外振动开辟了新的机会。
The development of antenna structures for surface enhanced infrared absorption spectroscopy (SEIRA) is a topic of intense and growing interest for extending IR spectroscopy to zeptomolar quantities and ultimately to the single-molecule level. Here we show that strong infrared spectroscopic enhancements can be obtained from individual gold nanoantennas using conventional IR spectrometric sources. The antenna structure dimensions can be tuned to enhance the IR modes of specific chemical moieties. Simulations of the electric field intensity in the antenna junction region reveal a maximum SEIRA enhancement factor of more than 12 000. These findings open new opportunities for analyzing IR vibrations of exceptionally small quantities of molecules using widely accessible light sources.