Lanthanide-doped nanoparticles encountering porphyrin hydrate: Boosting a dual-mode optical nanokit for Cu2+ sensing

作者：Yan, Qing; Chen, Zi-Han; Xue, Shi-Fan; Han, Xin-Yue; Lin, Zi-Yang; Zhang, Shengqiang; Shi, Guoyue; Zhang, Min^*

来源：Sensors and Actuators B: Chemical , 2018, 268: 108-114.

DOI：10.1016/j.snb.2018.04.080

• UCNPs
• Cu2+
• Porphyrin hydrate
• Dual-mode
• Optical nanokit

A facile dual-mode optical nanokit for Cu2+ detection has been developed based on a distinctive synergy between ligand-free lanthanide-doped upconversion nanoparticles (UCNPs) and porphyrin hydrate. Oleic acid (OA)-capped beta-NaYF4: 20%Yb, 0.5%Tm UCNPs were synthesized and then experienced an acid treatment for the preparation water-dispersible ligand-free UCNPs. The resulting UCNPs can readily combine a commercially available porphyrin hydrate (TPPS) to form UCNPs/TPPS complex, showing a green color from TPPS and low upconversion fluorescence of UCNPs quenched by TPPS due to fluorescence resonance energy transfer (FRET). The as-prepared UCNPs/TPPS can further combine Cu2+ into its cavity through the Cu2+-TPPS bonding. Then, a distinctive synergy between UCNPs and TPPS would be generated including the Cu2+-regulated color change of TPPS and its concomitant inhibiting effect on the preceding FRET, thus giving rise to an obvious color change from green to pink and a simultaneous enhancement of the upconversion fluorescence of UCNPs. Because of such distinctive synergy, UCNPs/TPPS has been demonstrated to be a novel dual-mode colorimetric and fluorometric nanokit for Cu2+ monitoring with high sensitivity and selectivity. Moreover, coupled with our proposed colorimetric nanokit, a realtime quantitative sensing has been also presented by using a smartphone with easy-to-access color-scanning APP as the detection platform.

• 出版日期2018-9-1
• 单位华东师范大学; 三明学院