摘要
以氯金酸(HAuCl_4)为前驱体,酪氨酸(Tyr)为还原剂和保护剂,通过"一步合成法"合成了具有较强荧光且离散性良好的金纳米簇(Tyr-AuNCs)。优化并确定了制备Tyr-AuNCs的最佳工艺条件:80℃下反应20 min,Tyr质量浓度为0. 4 mg/m L,HAuCl_4浓度为2. 0×10-3mol/L,pH=5的乙酸(CH_3COOH)缓冲溶液。通过研究Tyr-AuNCs与Fe^(3+)的作用机理发现,Fe^(3+)可导致Tyr-AuNCs荧光探针猝灭,Tyr-AuNCs的荧光强弱与Fe^(3+)的浓度(1. 0～50μmol/L)呈良好的线性关系,据此构建了水样中Fe^(3+)的定量检测方法,该方法检出限为2. 0×10-7mol/L,可用于实际水样中Fe^(3+)的分析检测。
Tyr-AuNCs,a kind of gold nanoclusters with strong fluorescence and excellent dispersivity,is synthesized by using one-step synthesis method,with chloroauric acid ( HAuCl4) as a precursor,and tyrosine ( Tyr) as a reducing agent and protective agent.The preparation method of Tyr-AuNCs is optimized and the optimum conditions are determined as follows: 20 min at 80℃,0. 4 mg·m L-1 for Tyr concentration,2. 0× 10-3 mol·L-1 for HAuCl4 concentration and acetic acid buffer solution with a pH value of 5.The mechanism of action between Tyr-AuNCs and Fe3+ is studied and it is found that Fe3+ can cause the fluorescence probe of Tyr-AuNCs to quench,and the fluorescence intensity of Tyr-AuNCs shows a good linear relationship with the concentration of Fe3+ ( 1. 0-50 μmol·L-1).Hence,a quantitative detection method for Fe3+ in water sample is built up,with a detection limit of 2. 0×10-7 mol·L-1,which can be used for the analysis of Fe3+ in actual water samples.
作者
吴晗
蔡会武
荀露露
郭瑜
WU Han;CAI Hui-wu;XUN Lu-lu;GUO Yu(College of Chemistry and Chemical Engineering,Xi'an University of Science and Technology,Xi'an 710054 China)
出处
《现代化工》
CAS
CSCD
北大核心
2019年第3期161-165,167,共6页
Modern Chemical Industry
关键词
金纳米簇
酪氨酸
荧光猝灭
铁离子
离子检测
gold nanocluster
tyrosine
fluorescence quenching
iron ion
ion detection
