SERS response from gold nanorods and dumbbells

Boris N. Khlebtsov; Vitaly A. Khanadeev; Andrey M. Burov; Nikolay G. Khlebtsov

doi:10.1117/12.2560454

9 April 2020 SERS response from gold nanorods and dumbbells

Boris N. Khlebtsov, Vitaly A. Khanadeev, Andrey M. Burov, Nikolay G. Khlebtsov

Proceedings Volume 11457, Saratov Fall Meeting 2019: Optical and Nano-Technologies for Biology and Medicine; 114570Y (2020) https://doi.org/10.1117/12.2560454
Event: Saratov Fall Meeting 2019: VII International Symposium on Optics and Biophotonics, 2019, Saratov, Russian Federation

Abstract

It is now believed that the on-resonance excitation of the plasmonic nanoparticle is necessary to increase the Raman signal intensity of nearby molecules. On this basis, researchers try to fabricate rationally designed nanoparticles for surface-enhanced Raman scattering (SERS) applications with plasmon resonance close to wavelength of excitation. However, existing experiments show inconsistent results of measuring the dependence of the enhancement factor as a function of nanopaticle plasmon resonance. To fill the gap, we use the method of controllable etching to prepare set of Au nanorod colloids with the equal concentration, nanorod width, shape and tunable plasmon resonance that incrementally spanned 650-920 nm. Nanorods were functionalized with 4-nitrobenzenethiol and surface-enhanced Raman spectra were measured in colloid under 785 nm laser excitation. As a result we observe weak correlation between nanorod plasmon peak and SERS response. The ratio of SERS signals for on-resonance and of-resonance excitation was below 2. Nanorods were further overgrowth to have dumbbell morphology. This transformation leads to strong increase in SERS enhancement factor. Thus tuning of nanoparticles shape is more important factor towards highest SERS response compared to nanoparticle plasmonic peak.

Citation Download Citation

Boris N. Khlebtsov, Vitaly A. Khanadeev, Andrey M. Burov, and Nikolay G. Khlebtsov "SERS response from gold nanorods and dumbbells", Proc. SPIE 11457, Saratov Fall Meeting 2019: Optical and Nano-Technologies for Biology and Medicine, 114570Y (9 April 2020); https://doi.org/10.1117/12.2560454

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Nanorods

Plasmons

Gold

Nanoparticles

Particles

Raman spectroscopy

Surface enhanced Raman spectroscopy

Show All Keywords

Keywords/Phrases

Search In:

Publication Years