Tunable SERS signals of Rhodamine B molecules on Fe3O4@Au nanocomposite substrates controlled by magnetic field

Hao Song; Rui Yang Fang; Ling Li

doi:10.1117/12.2314761

20 February 2018 Tunable SERS signals of Rhodamine B molecules on Fe₃O₄@Au nanocomposite substrates controlled by magnetic field

Hao Song, Rui Yang Fang, Ling Li

Author Affiliations +

Proceedings Volume 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application; 106974U (2018) https://doi.org/10.1117/12.2314761
Event: Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 2017, Nanjing, China

Abstract

In this work, we experimentally synthesized the Fe₃O₄@Au nanocomposites and used them as surface-enhanced Raman scattering (SERS) substrates. The Fe₃O₄@Au nanocomposites retained the metallic plasmon resonant effect and possessed the magnetic field controllable characteristics. The Raman spectra of Rhodamine B (RhB) probe molecules were studied under different external magnetic field. The magnitude of external magnetic field varied from 0 Gs to 700 Gs (1 Gs = 10⁻⁴ T) with intervals of 100 Gs. When the magnetic field magnitude increased, the Raman intensity of RhB probe molecules at 1356 cm^-1 increased linearly. The slope of the linear fitting curves for the Raman intensity and area were 0.118/Gs and 3.700/Gs. The Raman enhancement could raise up to 7 times for RhB probe molecules when the magnetic field magnitude increased to 700 Gs. After removing the external magnetic field, the Raman peaks returned to its original intensity in several minutes. Under the external magnetic field, the Fe₃O₄@Au nanocomposites were concentrated, leading to the increase number of SERS “hot spots” and the surface Au density. The results show that the magnetic field controlled Fe₃O₄@Au nanocomposites can realize the enhanced and controllable SERS effect, which can be used in the reversible optical sensing and bio-medical applications.

Citation Download Citation

Hao Song, Rui Yang Fang, and Ling Li "Tunable SERS signals of Rhodamine B molecules on Fe₃O₄@Au nanocomposite substrates controlled by magnetic field", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 106974U (20 February 2018); https://doi.org/10.1117/12.2314761

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