New Fluorescent Metal-Ion Detection Using a Paper-Based Sensor Strip Containing Tethered Rhodamine Carbon Nanodots
New Fluorescent Metal-Ion Detection Using a Paper-Based Sensor Strip Containing Tethered Rhodamine Carbon Nanodots
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DOI：
10.1021/acsami.5b04724
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发表时间：
2015-07-22
影响因子：
9.5
通讯作者：
Lee, Taek Seung
中科院分区：
文献类型：
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作者：
Kim, Yujun;Jang, Geunseok;Lee, Taek Seung
采用基于福斯特共振能量转移（FRET）的比例传感机制，设计了拴系罗丹明碳纳米点条带（C-dots），用于选择性检测Al3+离子。探针由固定在水溶性c点表面的罗丹明B组成。暴露于Al3+后，罗丹明部分在其吸收波长的激发下通过c点的能量转移显示出大大增强的发射强度。检测机制与Al3+通过罗丹明6G片段与Al3+的螯合作用诱导C-dots上罗丹明开环，导致C-dots（供体）的吸收和罗丹明（受体）开环的发射光谱重叠有关。此外，还制备了含有拴系罗丹明c点的纸基传感器条，用于Al3+传感的实际、通用应用。基于纸张的传感器可以有效地检测Al3+，甚至从金属离子的混合物中，通过FRET在长波发射时增加发射强度。基于c点FRET的传感具有颜色可调、肉眼可识别的特点，为特定金属离子的传感提供了新的平台。
A strip of tethered rhodamine carbon nanodots (C-dots) was designed for selective detection of Al3+ ion using a Forster 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.