Surface Topographical Engineering of Chiral Au Nanocrystals with Chiral Hot Spots for Plasmon-Enhanced Chiral Discrimination.
Surface Topographical Engineering of Chiral Au Nanocrystals with Chiral Hot Spots for Plasmon-Enhanced Chiral Discrimination.
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DOI：
10.1021/acs.nanolett.3c02385
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发表时间：
2023-08
期刊：
影响因子：
10.8
通讯作者：
Fengxia Wu;Fenghua Li;Yu Tian;Xiali Lv;Xiaoxi Luan;G. Xu;Wenxin Niu
中科院分区：
文献类型：
--
作者：
Fengxia Wu;Fenghua Li;Yu Tian;Xiali Lv;Xiaoxi Luan;G. Xu;Wenxin Niu
手性等离子体纳米结构的表面粗糙度产生不对称的局部电磁场，这在手性识别、手性光谱传感和对映选择性手性识别中具有很大的应用前景。在这项研究中，我们开发了一种表面形貌工程的方法来精确地操纵手性Au纳米晶体的表面结构。通过在生长过程中仔细控制L-或D-胱氨酸（Cys）和种子溶液的量，我们成功地合成了具有高度无序、有序和较少有序褶皱表面的手性Au纳米晶体。一个基本的原则，表面粗糙度之间的关系，有序性，和手性响应也提出了。更重要的是，纳米晶表面的手性有序褶皱产生了强度增强的非对称局域电场，从而实现了对青霉胺（Pen）对映体的优异等离子体增强手性识别能力。这项工作为操纵手性纳米晶体的表面结构和设计具有手性热点的高灵敏度等离子体增强对映选择性传感器提供了令人兴奋的前景。
Surface roughness in chiral plasmonic nanostructures generates asymmetrical localized electromagnetic fields, which hold great promise for applications in chiral recognition, chiroptical spectroscopic sensing, and enantioselective photocatalysis. In this study, we develop a surface topographical engineering approach to precisely manipulate the surface structures of chiral Au nanocrystals. Through carefully controlling the amounts of l- or d-cystine (Cys) and the seed solution in the growth process, we successfully synthesize chiral Au nanocrystals with highly disordered, ordered, and less ordered wrinkled surfaces. An underlying principle governing the relationship between surface roughness, orderliness, and chiroptical response is also proposed. More importantly, the chiral ordered wrinkles on the surfaces of the nanocrystals generate asymmetrical localized electronic fields with enhanced intensity, which achieve excellent plasmon-enhanced chiral discrimination ability for penicillamine (Pen) enantiomers. This work offers exciting prospects for manipulating the surface structures of chiral nanocrystals and designing highly sensitive plasmon-enhanced enantioselective sensors with chiral hot spots.