Abstract We developed a rapid and non-toxic method for the preparation of colloidal gold nanoparticles (GNPs) by using tryptophan (Trp)
as reducing/stabilizing agent. We show that the temperature has a major influence on the kinetics of gold ion reduction and
the crystal growth, higher temperatures favoring the synthesis of anisotropic nanoparticles (triangles and hexagons). The
as-synthesized nanostructures were characterized by UV–Vis absorption spectroscopy, transmission electron microscopy (TEM),
X-ray diffraction (XRD), fluorescence, and surface-enhanced Raman scattering (SERS) spectroscopy. The UV–Vis measurements
confirmed that temperature is a critical factor in the synthesis process, having a major effect on the shape of the synthesized
GNPs. Moreover, fluorescence spectroscopy was able to monitor the quenching of the Trp fluorescence during the in situ synthesis
of GNPs. Using Trp as molecular analyte to evaluate the SERS efficiency of as-prepared GNPs at different temperatures, we
demonstrated that the Raman enhancement of the synthesized gold nanoplates is higher than that of the gold spherical nanoparticles.
as reducing/stabilizing agent. We show that the temperature has a major influence on the kinetics of gold ion reduction and
the crystal growth, higher temperatures favoring the synthesis of anisotropic nanoparticles (triangles and hexagons). The
as-synthesized nanostructures were characterized by UV–Vis absorption spectroscopy, transmission electron microscopy (TEM),
X-ray diffraction (XRD), fluorescence, and surface-enhanced Raman scattering (SERS) spectroscopy. The UV–Vis measurements
confirmed that temperature is a critical factor in the synthesis process, having a major effect on the shape of the synthesized
GNPs. Moreover, fluorescence spectroscopy was able to monitor the quenching of the Trp fluorescence during the in situ synthesis
of GNPs. Using Trp as molecular analyte to evaluate the SERS efficiency of as-prepared GNPs at different temperatures, we
demonstrated that the Raman enhancement of the synthesized gold nanoplates is higher than that of the gold spherical nanoparticles.
- Content Type Journal Article
- Category Research Paper
- DOI 10.1007/s11051-010-9869-6
- Authors
- Monica Iosin, Babes-Bolyai University Nanobiophotonics Laboratory, Institute for Interdisciplinary Experimental Research Treboniu Laurian 42 400271 Cluj-Napoca Romania
- Patrice Baldeck, Université Joseph Fourier, CNRS (UMR5588) Laboratoire de Spectrométrie Physique BP 87 38402 Saint Martin d’Hères France
- Simion Astilean, Babes-Bolyai University Nanobiophotonics Laboratory, Institute for Interdisciplinary Experimental Research Treboniu Laurian 42 400271 Cluj-Napoca Romania
- Journal Journal of Nanoparticle Research
- Online ISSN 1572-896X
- Print ISSN 1388-0764
No comments:
Post a Comment