期刊
ADVANCED OPTICAL MATERIALS
卷 6, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201701324
关键词
gold nanoparticles; luminescence; pH; surface plasmon absorption; ultrasmall size
资金
- National Science Foundation of China [21573078]
- 1000 Young Talent Program
- Guangdong Natural Science Funds for Distinguished Young Scholars [2016A030306024]
- Fundamental Research Funds for the Central Universities
Luminescent gold nanoparticles (AuNPs) with ultrasmall sizes (2-3 nm) and few free electrons have attracted fundamental science and application research interests due to their robust emission properties, but discoveries on their fantastic plasmonic properties are limited. Herein, controllable surface plasmon resonance (SPR) absorption (>520 nm) is reported from ultrasmall luminescent AuNPs (approximate to 2.0 nm) coated with a small thiolate surface ligand, mercaptoimidazole (MIZ), through pH regulation. The 690 nm emitting MIZ-AuNPs show SPR absorption and emission with a reversibly pH-dependent response, i.e., a strong emission with no SPR band at high pH values (e.g., pH 5.0) and strong SPR absorption (570 nm) with weak emission at low pH values (e.g., pH 2.0). The MIZ surface coating, which has a low steric hindrance and high tendency to form intermolecular hydrogen bonds, is shown to play an important role in the creation of strong plasmon coupling and the emergence of plasmonic properties from ultrasmall MIZ-AuNPs with 44% Au(I) species. The discovery of a plasmonic property in semiconducting luminescent MIZ-AuNPs opens a new pathway for further understanding the optical properties of AuNPs and designing a new generation of optical AuNPs for various future applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据