A turn-on fluorescent probe for Hg2+ detection by using gold nanoparticle-based hybrid microgels

作者：Tang, Yecang^*; Ding, Yi; Wu, Ting; Lv, Liying; Yan, Zhicheng

来源：Sensors and Actuators B: Chemical , 2016, 228: 767-773.

DOI：10.1016/j.snb.2016.01.112

• Fluorescence turn-on
• Mercury detection
• Hybrid microgels
• Gold nanoparticle

Hybrid microgels with Au nanoparticles (AuNPs) immobilized in poly(N-isopropylacrylamideco-2-(dimethylamino)ethylmethacrylate) (P(NIPAM-co-DMA)) microgels have been prepared. The as-synthesized hybrid microgels showed excellent thermo- and pH-responsive properties and high stabilities. 1-pyrenebutyric acid (PBA) molecules were then adsorbed on the AuNP surfaces via electrostatic interactions to form PBA-AuNPs/P(NIPAM-co-DMA) composites that were used as probes for the detection of Hg2+. The fluorescence of PBA was effectively quenched through fluorescence resonance energy transfer between AuNPs and PBA molecules. However, the addition of Hg2+ ions caused the fluorescence turn-on dramatically and 16 times fluorescence enhancement was obtained, which is attributed the fact that Hg2+ ions replace the adsorbed PBA molecules.

• 出版日期2016-6-2
• 单位安徽师范大学