Full-Color Tuning of Surface Plasmon Resonance by Compositional Variation of Au@Ag Core鈥揝hell Nanocubes with Sulfides
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- 作者：Garam Park ; Chanhyoung Lee ; Daeha Seo ; Hyunjoon Song
- 刊名：Langmuir
- 出版年：2012
- 出版时间：June 19, 2012
- 年：2012
- 卷：28
- 期：24
- 页码：9003-9009
- 全文大小：405K
- 年卷期：v.28,no.24(June 19, 2012)
- ISSN：1520-5827
文摘
In the present study, we demonstrate the precise tuning of surface plasmon resonance over the full visible range by compositional variation of the nanoparticles. The addition of sulfide ions into the Au@Ag core鈥搒hell nanocubes generates stable Au@Ag/Ag2S core鈥搒hell nanoparticles at room temperature, and the plasmon extinction maximum shifts to the longer wavelength covering the entire visible range of 500鈥?50 nm. Based on the optical property, the Au@Ag core鈥搒hell nanocubes are employed as a colorimetric sensing framework for sulfide detection in water. The detection limit is measured to be 10 ppb by UV鈥搗is spectroscopy and 200 ppb by naked eyes. Such nanoparticles would be useful for decoration and sensing purposes, due to their precise color tunability and high stability.