Au@NBT@Ag tags with different thickness of the metallic shell: synthesis and SERS properties

Andrey M. Burov; Boris N. Khlebtsov; Nikolay G. Khlebtsov

doi:10.1117/12.2560632

9 April 2020 Au@NBT@Ag tags with different thickness of the metallic shell: synthesis and SERS properties

Andrey M. Burov, Boris N. Khlebtsov, Nikolay G. Khlebtsov

Proceedings Volume 11457, Saratov Fall Meeting 2019: Optical and Nano-Technologies for Biology and Medicine; 1145710 (2020) https://doi.org/10.1117/12.2560632
Event: Saratov Fall Meeting 2019: VII International Symposium on Optics and Biophotonics, 2019, Saratov, Russian Federation

Abstract

Bimetallic Au-Ag SERS tags with aromatic Raman reporters embedded between layers have emerged as new type of nanoparticles with high potential for application in various fields of biochemistry and biomedicine. Particular interest is based on their high SERS enhancement factor under non-resonant laser irradiation. The thickness and shape of the outer silver layer is one of the factors determining the SERS properties of bimetallic nanoprobes. Here we studied eight types of AuNR core@embedded Raman reporter (4-nitrobenzenthiol)@Ag shell nanoparticles with various shell thicknesses from 2 to 40 nm. The SERS enhancement factor for our samples varied in the range of 2.35-6.68×10⁵; the maximum value was observed for particles with an outer shell thickness of 3 nm along the long nanorod axis of the rod and 16 nm along the short one. Simulation of the electromagnetic field by the FDTD method showed the presence of socalled “hot spots” at the boundary of the metal layers in a series of samples with high SERS EF.

Citation Download Citation

Andrey M. Burov, Boris N. Khlebtsov, and Nikolay G. Khlebtsov "Au@NBT@Ag tags with different thickness of the metallic shell: synthesis and SERS properties", Proc. SPIE 11457, Saratov Fall Meeting 2019: Optical and Nano-Technologies for Biology and Medicine, 1145710 (9 April 2020); https://doi.org/10.1117/12.2560632

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