Abstract
Au–FexOy 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–FexOy 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–1) 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.
Keywords
Gold nanoparticles; magnetic properties; synthesis; composite materials; plasmon resonance; luminescence; sustainability
Date of this Version
3-15-2017
Recommended Citation
Kadasala, Naveen Reddy; Lin, Lu; Gilpin, Christopher; and Wei, Alexander, "Eco-friendly (green) synthesis of magnetically active gold nanoclusters" (2017). Department of Chemistry Faculty Publications. Paper 28.
https://docs.lib.purdue.edu/chempubs/28
Comments
Kadasala, N. R., Lin, L., Gilpin, C., & Wei, A. (2017). Eco-friendly (green) synthesis of magnetically active gold nanoclusters. Science and Technology of Advanced Materials, 18(1), 210–218. The version of record is available at DOI: 10.1080/14686996.2017.1290492, and is published CC-BY.