Seeded Growth Synthesis of Gold Nanotriangles: Size Control, SAXS Analysis, and SERS Performance
Kuttner C, Mayer M, Dulle M, Moscoso A, Lopez-Romero JM, Foerster S, Fery A, Perez-Juste J, Contreras-Caceres R (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 10
Pages Range: 11152-11163
Journal Issue: 13
Abstract
We studied the controlled growth of triangular prismatic Au nanoparticles with different beveled sides for surface-enhanced Raman spectroscopy (SERS) applications. First, in a seedless synthesis using 3-butenoic acid (3BA) and benzyldimethylammonium chloride (BDAC), gold nanotriangles (AuNTs) were synthesized in a mixture with gold nanooctahedra (AuNOCs) and separated by depletion-induced flocculation. Here, the influence of temperature, pH, and reducing agent on the reaction kinetics was initially investigated by UV-vis and correlated to the size and yield of AuNT seeds. In a second step, the AuNT size was increased by seed-mediated overgrowth with Au. We show for the first time that preformed 3BA-synthesized AuNT seeds can be overgrown up to a final edge length of 175 nm and a thickness of 80 nm while maintaining their triangular shape and tip sharpness. The NT morphology, including edge length, thickness, and tip rounding, was precisely characterized in dispersion by small-angle X-ray scattering and in dry state by transmission electron microscopy and field-emission scanning electron microscopy. For sensor purposes, we studied the size-dependent SERS performance of AuNTs yielding analytical enhancement factors between 0.9 × 104 and 5.6 × 104 and nanomolar limit of detection (10-8-10-9 M) for 4-mercaptobenzoic acid and BDAC. These results confirm that the 3BA approach allows the fabrication of AuNTs in a whole range of sizes maintaining the NT morphology. This enables tailoring of localized surface plasmon resonances between 590 and 740 nm, even in the near-infrared window of a biological tissue, for use as colloidal SERS sensing agents or for optoelectronic applications.
Involved external institutions
Leibniz-Institut für Polymerforschung Dresden e. V.
Germany (DE)
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
Universidad de Málaga / University of Malaga
Spain (ES)
University of Vigo / Universidade de Vigo
Spain (ES)
Germany (DE)
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
Universidad de Málaga / University of Malaga
Spain (ES)
University of Vigo / Universidade de Vigo
Spain (ES)
How to cite
APA:
Kuttner, C., Mayer, M., Dulle, M., Moscoso, A., Lopez-Romero, J.M., Foerster, S.,... Contreras-Caceres, R. (2018). Seeded Growth Synthesis of Gold Nanotriangles: Size Control, SAXS Analysis, and SERS Performance. ACS Applied Materials and Interfaces, 10(13), 11152-11163. https://doi.org/10.1021/acsami.7b19081
MLA:
Kuttner, Christian, et al. "Seeded Growth Synthesis of Gold Nanotriangles: Size Control, SAXS Analysis, and SERS Performance." ACS Applied Materials and Interfaces 10.13 (2018): 11152-11163.
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