A simple one-step procedure to synthesise gold nanostars in concentrated aqueous surfactant solutions
- Due to the enhanced electromagnetic field at the tips of metal nanoparticles, the spiked structure of gold nanostars (AuNSs) is promising for surface-enhanced Raman scattering (SERS). Therefore, the challenge is the synthesis of well designed particles with sharp tips. The influence of different surfactants, i.e., dioctyl sodium sulfosuccinate (AOT), sodium dodecyl sulfate (SDS), and benzylhexadecyldimethylammonium chloride (BDAC), as well as the combination of surfactant mixtures on the formation of nanostars in the presence of Ag⁺ ions and ascorbic acid was investigated. By varying the amount of BDAC in mixed micelles the core/spike-shell morphology of the resulting AuNSs can be tuned from small cores to large ones with sharp and large spikes. The concomitant red-shift in the absorption toward the NIR region without losing the SERS enhancement enables their use for biological applications and for time-resolved spectroscopic studies of chemical reactions, which require a permanent supply with a fresh and homogeneous solution. HRTEMDue to the enhanced electromagnetic field at the tips of metal nanoparticles, the spiked structure of gold nanostars (AuNSs) is promising for surface-enhanced Raman scattering (SERS). Therefore, the challenge is the synthesis of well designed particles with sharp tips. The influence of different surfactants, i.e., dioctyl sodium sulfosuccinate (AOT), sodium dodecyl sulfate (SDS), and benzylhexadecyldimethylammonium chloride (BDAC), as well as the combination of surfactant mixtures on the formation of nanostars in the presence of Ag⁺ ions and ascorbic acid was investigated. By varying the amount of BDAC in mixed micelles the core/spike-shell morphology of the resulting AuNSs can be tuned from small cores to large ones with sharp and large spikes. The concomitant red-shift in the absorption toward the NIR region without losing the SERS enhancement enables their use for biological applications and for time-resolved spectroscopic studies of chemical reactions, which require a permanent supply with a fresh and homogeneous solution. HRTEM micrographs and energy-dispersive X-ray (EDX) experiments allow us to verify the mechanism of nanostar formation according to the silver underpotential deposition on the spike surface in combination with micelle adsorption.…
Verfasserangaben: | Ferenc LiebigGND, Ricky Henning, Radwan Mohamed SarhanORCiDGND, Claudia Christina PrietzelGND, Clemens Nikolaus Zeno SchmittORCiDGND, Matias BargheerORCiDGND, Joachim KoetzORCiDGND |
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URN: | urn:nbn:de:kobv:517-opus4-438743 |
DOI: | https://doi.org/10.25932/publishup-43874 |
ISSN: | 1866-8372 |
Titel des übergeordneten Werks (Englisch): | Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe |
Schriftenreihe (Bandnummer): | Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (769) |
Publikationstyp: | Postprint |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 21.11.2019 |
Erscheinungsjahr: | 2019 |
Veröffentlichende Institution: | Universität Potsdam |
Datum der Freischaltung: | 21.11.2019 |
Freies Schlagwort / Tag: | nanoflowers; nanoparticles; nanotriangles; optical-properties; sers; size; ultrafast; wavelength |
Ausgabe: | 769 |
Seitenanzahl: | 9 |
Erste Seite: | 23633 |
Letzte Seite: | 23641 |
Quelle: | RSC Advances 9 (2019), S. 23633–23641 DOI: 10.1039/C9RA02384D |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
Peer Review: | Referiert |
Publikationsweg: | Open Access |
Lizenz (Deutsch): | Creative Commons - Namensnennung, 3.0 Deutschland |
Externe Anmerkung: | Bibliographieeintrag der Originalveröffentlichung/Quelle |