Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.3: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Zig-zag silver nanorods with high density hotspots for surface enhanced Raman scattering — •Samir Kumar and J P Singh — Department of Physics, Indian Institute of Technology Delhi

In recent years, silver nanorod (AgNR) arrays fabricated by GLAD have attracted significant attention due to their high surface enhanced Raman spectroscopy (SERS) performance. For SERS, the major enhancement mechanism is due to the enhancement of localized electric field generated by metallic nanostructures. The SERS performance significantly depends upon the number of hotspots. On folding a nanorod into zig-zag structure can generate corners or bends and hence it enhances the SERS performance. Among the different types of hotspots nanogaps can tremendously enhance the SERS intensity. In this work, we investigated that the SERS intensity increases with number of hotspots. For this, different arms silver zig-zag nanostructures have been fabricated. Their SERS spectra revealed that the SERS performance can be improved on increasing the number of arms. Further, the role of nanogaps in silver zig-zag nanostructures has been studied. It is observed that the SERS intensity from nanogap zig-zag silver nanorods array is higher than from silver zig-zag nanostructures i.e. nanogaps contributed more in SERS enhancement. The SERS signals was investigated by using Raman probe molecule trans-1,2-bis(4-pyridyl)ethane (BPE). Our observations showed that the Ag zig-zag plasmonic structures with nanogaps between their arms produced extremely high SERS signal. This can be explained due to the plasmon coupling interaction between the Ag nanorods.