标题：Silver nanoflowers-enhanced Tb(III)/La(III) co-luminescence for the sensitive detection of dopamine
作者：Sun, Chongmei; Shen, Jin; Cui, Rongwei; Yuan, Fangzheng; Zhang, Hui; Wu, Xia
作者机构：[Sun, Chongmei; Shen, Jin; Cui, Rongwei; Yuan, Fangzheng; Zhang, Hui; Wu, Xia] Shandong Univ, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, 更多
通讯作者：Wu, Xia;Wu, X
通讯作者地址：[Wu, X]Shandong Univ, Sch Chem & Chem Engn, Key Lab Colloid & Interface Chem, Minist Educ, Jinan 250100, Shandong, Peoples R China.
来源：ANALYTICAL AND BIOANALYTICAL CHEMISTRY
关键词：Silver nanoflowers; Anisotropic nanoparticles; Surface-enhanced; fluorescence; Rare earth elements; Co-luminescence; Dopamine
摘要：A sensitive fluorescent analytical method for the detection of dopamine (DA) was developed based on surface-enhanced Tb(III)/La(III) co-luminescence using silver nanoflowers (AgNFs). Anisotropic AgNFs show strong surface-enhanced fluorescence effect owing to the abundant sharp tips. Tb(III)/La(III)-DA complexes mainly bind to the sharp tips of AgNFs and thus shorten the distance between the complexes. The shortened distance gives rise to obvious surface-enhanced Tb(III)/La(III) co-luminescence effect. In this work, AgNFs offer many superior properties, such as enhanced intrinsic green fluorescence of Tb(III) ((ex)/(em)=310/546nm), increased fluorescence lifetime, and improved energy transfer efficiency. Under the optimum conditions, the fluorescence intensity is linearly correlated with the concentration of DA in the range of 0.80-10nM (R-2=0.9970), and the detection limit is 0.34nM (S/N=3). The fluorescent nanoprobe was successfully applied to the determination of DA in human serum samples with recoveries ranging from 99.1 to 102.6%.