New Fluorescent Metal-Ion Detection Using a Paper-Based Sensor Strip Containing Tethered Rhodamine Carbon Nanodots
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- 作者：Yujun Kim ; Geunseok Jang ; Taek Seung Lee
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：July 22, 2015
- 年：2015
- 卷：7
- 期：28
- 页码：15649-15657
- 全文大小：558K
- ISSN：1944-8252
文摘
A strip of tethered rhodamine carbon nanodots (C-dots) was designed for selective detection of Al3+ ion using a F枚rster resonance energy transfer (FRET)-based ratiometric sensing mechanism. The probe consisted of rhodamine B moieties immobilized on the surface of water-soluble C-dots. Upon exposure to Al3+, the rhodamine moieties showed a much enhanced emission intensity via energy transfer from the C-dots under excitation at their absorption wavelength. The detection mechanism was related to the Al3+-induced ring-opening of rhodamine on C-dots through the chelation of the rhodamine 6G moiety with Al3+, leading to a spectral overlap of the absorption of C-dots (donor) and the emission of ring-opened rhodamine (acceptor). In addition, a paper-based sensor strip containing the tethered rhodamine C-dots was prepared for practical, versatile applications of Al3+ sensing. The paper-based sensor could detect Al3+ over other metal ions efficiently, even from a mixture of metal ions, with increased emission intensity at long-wavelength emission via FRET. Sensing based on FRET of C-dots is color-tunable, can be recognized with a naked eye, and may provide a new platform for specific metal-ion sensing.