Single-particle inductively coupled plasma mass spectroscopy analysis of size and number concentration in mixtures of monometallic and bimetallic (core-shell) nanoparticles

双金属片 化学 纳米颗粒 粒径 电感耦合等离子体质谱法 分析化学(期刊) 粒子(生态学) 感应耦合等离子体 光谱学 壳体(结构) 等离子体原子发射光谱 等离子体 质谱法 金属 色谱法 纳米技术 材料科学 物理化学 核物理学 有机化学 地质学 复合材料 物理 海洋学 量子力学
作者
Ruth C. Merrifield,Chady Stephan,Jamie R. Lead
出处
期刊:Talanta [Elsevier BV]
卷期号:162: 130-134 被引量:41
标识
DOI:10.1016/j.talanta.2016.09.070
摘要

It is challenging to separate and measure the physical and chemical properties of monometallic and bimetallic engineered nanoparticles (NPs), especially when mixtures are similar in size and at low concentration. We report that single particle inductively coupled mass spectroscopy (SP-ICP-MS), alongside field flow fractionation (FFF), has allowed for the accurate measurement of size and particle number concentrations of mixed metallic nanoparticles (NPs) containing monometallic NPs of gold (Au) and silver (Ag) and a bimetallic core-shell structured NP (Au@Ag) of equivalent size. Two sets of these NPs were measured. The first contained only 60nm particles, where the Au@Ag NP had a 30nm core and 15nm shell to make a total diameter of 60nm. The second contained only 80nm particles (Au@Ag NP core particle of 50nm with a 15nm shell). FFF separation was used here as a sizing technique rather than a separation technique. It was used to confirm that suspensions containing either individual or mixtures of the Au 60nm, Ag 60nm and AuAg 60nm suspensions eluted together and were of the same size. Similarly, FFF was used to show that suspensions containing individual or mixtures of the equivalent 80nm, eluted together and were of the same size. Although the 60nm and 80nm suspensions did not elute at the same time they were not run together. SP-ICP-MS is then used to identify the size and concentration of the particles within the suspension. Successful separation of the NPs was effected and the limits of the instrument were obtained.
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