Abstract
Fe3O4/Au composite particles with core/shell structure were prepared by reduction of Au3+ with hydroxylamine in the presence of an excess of Fe3 O4 as seeds. The resultant colloids, with an average diameter of less than 100 nm, were obtained; the remaining non-reacted Fe3O4 seeds can be removed by treatment with diluted HCl solution. The Fe3O4/Au colloids exhibit a characteristic peak of UV-visible spectra, which largely depend on the size of the particle and the suspension medium. The localized surface plasmon resonance peaks red shift and broaden with increased nanoparticle diameter or increased solvent ionic strength. The optical property is very important in the establishment of means for the detection of biomolecules.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Parak, W. J., Pellegrino, T., Micheel, C. M. et al., Conformation of oligonucleotides attached to gold nanocrystals probed by gel electrophoresis, Nano Lett. 2003, 3(1): 33–36.
Jin, R. C., Wu, G. S., Li, Z. et al., What controls the melting properties of DNA-linked gold nanoparticle assemblies? J. Am. Chem. Soc.,2003, 125(6): 1643–1654.
Safarik, I., Ptackova, L., Safarikova, M., Large-scale separation of magnetic bioaffinity adsorbents, Biotechnology Letters, 2001, 23: 1953–1956.
Goodwin, S. C., Bittner, C. A., Peterson, C. L. et al., Single-dose toxicity study of hepatic intra-arterial infusion of doxorubicin coupled to a novel magnetically targeted drug carrier, Toxicologi- cal Sciences, 2001, 60: 177–183.
Graepler, F., Lauer, U., Gregor, M., Magnetic cell sorting for parietal cell purification using a new monoclonal antibody without influence on cell function, Journal of Biochemical and Biophysical Methods, 1998, 36(2-3): 143–155.
Caldarelli-Stefano, R., Vago, L., Bonetto, S. et al., Use of magnetic beads for tissue DNA extraction and IS6110 Mycobacterium tuberculosis PCR, Journal of Clinical Pathology: Molecular Pathology, 1999, 52 (3): 158–160.
Brown, K. R., Natan, M. J., Hydroxylamine seeding of colloidal Au nanoparticles in solution and on surface, Langmuir, 1998, 14: 726–728.
Cui, Y., Hu, D., Fang, Y. et al., Preparation and mechanism of Fe3O4/Au core/shell super-paramagnetic microspheres, Science in China, Ser. B, 2001, 44(4): 404–410.
Cui, Y., Hui, W., Wang, H. et al., Preparation and characterization of Fe3O4/Au composite particles, Science in China, Ser. B, 2004, 47(2): 152–158.
Kreibig, U., Optical absorption of small metallic particles, Surface Science, 1985, 156: 678–700.
Storhoff, J. J., Lazaorides, A. A., Mucic, R. C. et al., What controls the optical properties of DNA-linked gold nanoparticle assemblies? J. Am. Chem. Soc., 2000, 122: 4640–4650.
Mirkin, C. A., Letsinger, R. L., Mucic, R. C. et al., A DNA-based method for rationally assembling nanoparticles into macroscopic materials, Nature, 1996, 382: 607–609.
Taton, T. A., Mirkin, C. A., Letsinger, R. L., Scanometric DNA array detection with nanoparticle probes, Science, 2000, 289: 1757–1760.
Kinoshita, T., Seino, S., Okitsu, K. et al., Magnetic evaluation of nanostructure of gold-iron composite particles synthesized by a reverse micelle method, Journal of Alloys and Compounds, 2003, 359:46–50.
Pham, T., Jackson, J. B., Halas, N. J. et al., Preparation and characterization of gold nano-shells coated with self-assembled monolayers, Langmuir, 2002, 18: 4915–4920.
Lyon, J. L., Fleming, D. A., Stone, M. B. et al., Synthesis of Fe oxide core/Au shell nanoparticles by iterative hydroxylamine seeding, Nano Letters, 2004, 4(4): 719–723.
Author information
Authors and Affiliations
Corresponding authors
Rights and permissions
About this article
Cite this article
Cui, Y., Hui, W., Su, J. et al. Fe3O4/Au composite nano-particles and their optical properties. Sc. China Ser. B-Chem. 48, 273–278 (2005). https://doi.org/10.1360/042004-51
Received:
Issue Date:
DOI: https://doi.org/10.1360/042004-51