Kadasala Naveen Reddy, Lin Lu, Gilpin Christopher, Wei Alexander
Department of Chemistry, Purdue University, West Lafayette, IN, USA.
Sci Technol Adv Mater. 2017 Mar 15;18(1):210-218. doi: 10.1080/14686996.2017.1290492. eCollection 2017.
Au-FeO composite nanoparticles (NPs) are of great technological interest due to their combined optical and magnetic properties. However, typical syntheses are neither simple nor ecologically friendly, creating a challenging situation for process scale-up. Here we describe conditions for preparing Au-FeO NPs in aqueous solutions and at ambient temperatures, without resorting to solvents or amphiphilic surfactants with poor sustainability profiles. These magnetic gold nanoclusters (MGNCs) are prepared in practical yields with average sizes slightly below 100 nm, and surface plasmon resonances that extend to near-infrared wavelengths, and sufficient magnetic moment (up to 6 emu g) to permit collection within minutes by handheld magnets. The MGNCs also produce significant photoluminescence when excited at 488 nm. Energy dispersive X-ray (EDX) analysis indicates a relatively even distribution of Fe within the MGNCs, as opposed to a central magnetic core.
金-氧化铁复合纳米颗粒（NPs）因其兼具光学和磁性特性而具有重大的技术应用价值。然而，传统的合成方法既不简单也不环保，这给工艺放大带来了挑战。在此，我们描述了在水溶液中及室温下制备金-氧化铁纳米颗粒的条件，无需使用可持续性差的溶剂或两亲性表面活性剂。这些磁性金纳米团簇（MGNCs）的制备产率可观，平均尺寸略低于100纳米，表面等离子体共振延伸至近红外波长，并且具有足够的磁矩（高达6 emu g），可在几分钟内通过手持磁铁收集。当在488纳米处激发时，MGNCs还会产生显著的光致发光。能量色散X射线（EDX）分析表明，铁在MGNCs中分布相对均匀，而非集中在磁性核心处。
