摘要
以具有核-壳结构的Au@Si O2纳米颗粒为基底,用二乙基磷酰乙基三乙氧基硅烷(DPTS)和L-胱氨酸(L-Cystine)对其进行功能化修饰制备得二乙基磷酰乙基三乙氧基硅烷和L-胱氨酸功能化纳米金粒子(L-Cys-Au@Si O2-DPTS),利用羧酸根及磷酸根与铅离子形成金属螯合物后,引起纳米粒子的聚集,导致溶液由酒红色变为蓝色,这种颜色的转变可通过肉眼直接识别,从而建立起一种简单,快速且的可用于现场实时检测Pb2+的可视化比色检测的方法。通过优化p H、底物浓度和反应时间等条件后,相较于Ni2+,Co2+,Mn2+等9种金属离子,L-Cys-Au@Si O2-DPTS对Pb2+显示出了极高的选择性。在最优实验条件下,检测Pb2+时,浓度在10-5~10-4mol/L范围内呈现出良好的线性关系(R2=0.9983),最低检测限为3.43×10-8mol/L。
Au nanoparticles cofunctionalized with diethylphosphatoethyltriethoxysilane( DPTS) and L-cystine was used as selective colorimetric sensors for Pb2 +. The aggregation in the presence of Pb2 +is due to binding with chelating ligands(-COOH and – PO43-),yielding a red-to-bule color change,and could be monitored by naked eyes as well. By optimized the condition of p H,the Pb2 +concentration and reaction time,L-Cys-Au@ Si O2-DPTS showed high selectivity to Pb2 +in comparison with other 9 metal ions( Ni2 +,Cs+,Co2 +,Mn2 +,Cu2 +,Na2 +,Zn2 +,Mg2 +,Pb2 +,Sr2 +). Furthermore the detection limit can be as low as 3. 43 × 10-8mol / L.
出处
《东华理工大学学报（自然科学版）》
CAS
2015年第3期325-330,共6页
Journal of East China University of Technology(Natural Science)
基金
国家自然科学基金项目(21301028)
江西省教育厅科技项目(GJJ14472)
