Abstract
Gold nanoparticles in aqueous dispersion were prepared using the trisodium citrate reduction method to control the size of particles by changing the concentration of HAuCl4. The average particle size measured by DLS is higher than that obtained by TEM at a zeta potential of -40 mV. When trisodium citrate concentration is kept constant, the particle size increases with gold concentration. The kinetics of growth was studied and apparent kinetic rate constants were determined at various gold/citrate ratios. Gold nanoparticles were attached to silanized glass surfaces; Au rods were grown (ca. 200 nm) by adding more precursors and the rods’ growth rate was monitored by UV-Vis spectroscopy as well as by AFM. Surface functionalization of gold surface was influenced by cysteine. The surface modification by cysteine at pH=6.0 results in aggregation and the red shift of absorption maximum is nearly 200 nm. When glutathione molecules are bound onto the cysteinelinked Au rods on the glass surface, the spectral shift reaches only an amount of 5–10 nm, because the surface attachment hinders the tendency to aggregate.
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Imre Dékány is full professor of chemistry, Head of Department of Colloid Chemistry on University of Szeged. Member of Hungarian Academy of Sciences 2007. Teaching and research interest: colloid and surface chemistry, interfacial phenomena, nanostructured materials. Member of the editorial board: Colloids and Surfaces A, Advances in Colloid and Interface Science, Regional editor of Colloid and Polymer Science.
Andrea Majzik is a Research Fellow at Supramolecular and Nanostructured Materials Research Group of the Hungarian Academy of Sciences. She received her Ph.D. degree in environmental sciences at the University of Szeged this year. Currently her research interests focus on the preparation and characterization of gold and silver nanoparticles and investigations of the interaction between metal nanoparticles and amino acids and protein molecules.
Viktória Hornok is currently a Research Assistant at the Supramolecular and Nanostructured Materials Research Group in the Colloid Chemistry Department. Her research activities focus on the preparation, charachterization and application of Layer-by-Layer thin films (from nanoparticles, polyelectrolytes and proteins). Her research interest includes the near atomic-scale image and thickness determination of thin films by Atomic Force Microscope.
Rita Patakfalvi graduated in chemistry at the University of Attila József, Szeged, Hungary and started to work in the Nanostructured Research Group of the Hungarian Academy of Sciences. She received her Ph.D. degree in environmental sciences at the University of Szeged, Hungary in 2004. Her main research interest is the preparation and characterization of noble metal nanoparticles. Currently she is research scientist at “Centro Universitario de los Lagos”, at the University of Guadalajara, Mexico.
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Majzik, A., Patakfalvi, R., Hornok, V. et al. Growing and stability of gold nanoparticles and their functionalization by cysteine. Gold Bull 42, 113–123 (2009). https://doi.org/10.1007/BF03214921
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DOI: https://doi.org/10.1007/BF03214921