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以聚甲基丙烯酸单层保护的金纳米粒子(GNPs)作为传感器,实现了水溶液中Pb2+的选择性循环检测.先采用柠檬酸钠还原法获得尺寸均匀的GNPs,再通过具有硫醇端基的聚甲基丙烯酸与金的强耦合作用,获得了聚甲基丙烯酸单层保护的金纳米粒子(PMAA-@-GNPs).动态光散射、紫外-可见吸收光谱及透射电子显微镜表征证实了其单层结构.在Pb2+的诱导下,PMAA-@-GNPs溶液颜色从酒红色变为紫色并可肉眼识别.透射电子显微镜结果证实,这种变化是由于Pb2+交联羧基使聚合物发生收缩,并诱导GNPs的聚集所致.对比Pb2+与Hg2+,Mg2+,Cu2+,Zn2+,Na+,Ni2+,Fe3+,Cd2+,K+和Fe2+溶液颜色的变化,证实此体系具有一定的选择性.用EDTA可夺取交联的Pb2+,使PMAA-@-GNPs的吸收峰恢复并可用于循环检测Pb2+.
Using gold nanoparticles (GNPs) protected by poly (methacrylic acid) monolayer as sensor, the selective cycling detection of Pb2 + in aqueous solution was achieved.Non-size GNPs were first obtained by sodium citrate reduction method, (PMAA - @ - GNPs) protected by polymethacrylic acid monolayer were obtained by the strong coupling between polymethacrylic acid and gold.It was confirmed by dynamic light scattering, UV-Vis absorption spectra and transmission electron microscopy Layer structure.The color of PMAA - @ - GNPs solution changed from burgundy to purple under the inducement of Pb2 +, and was identified by the naked eye.Transmission electron microscopy confirmed that the change was due to the contraction of the polymer by Pb2 + GNPs in the solution.The change of the color of Pb2 + and Hg2 +, Mg2 +, Cu2 +, Zn2 +, Na +, Ni2 +, Fe3 +, Cd2 +, K + and Fe2 + solutions confirmed that this system has a certain selectivity.Using EDTA can capture the cross-linked Pb2 + , Which restored the absorption peak of PMAA - @ - GNPs and could be used for the cycle detection of Pb2 +.