Issue 2, 2015

Surface-enhanced Raman spectroscopy using a coffee-ring-type three-dimensional silver nanostructure

Abstract

We demonstrated surface-enhanced Raman spectroscopy using a coffee-ring-type three-dimensional silver nanostructure (Ag3D). Ag3D has high activity for surface-enhanced Raman scattering (SERS). We fabricated Ag3D using convective self-assembly to form a ‘coffee-ring’ structure that consisted of a mixed solution of silver particles and polystyrene latex beads. The mechanism of the formation of Ag3D is described by the competition among a radial flow, a Marangoni recirculating flow, DVLO interactions and sedimentation. Using Ag3D, measurements of a trace amount of 4,4′-bipyridine (4bpy) in aqueous solution were performed, and typical spectra of 4bpy were observed within 1 min of dropping 4bpy. By optimizing the Ag3D preparation conditions, we could observe the characteristic enhanced Raman spectrum of 1 nM 4bpy solution. In addition, we succeeded in observing chloride activation, which increased the intensity of the Raman spectra by a factor of two to three on addition of sodium chloride to Ag3D. SERS measurements using Ag3D were stable even with passing time, whereas the peak intensity drastically dropped within a few minutes in the case with silver nanoparticles only.

Graphical abstract: Surface-enhanced Raman spectroscopy using a coffee-ring-type three-dimensional silver nanostructure

Article information

Article type
Paper
Submitted
26 Там. 2014
Accepted
26 Қар. 2014
First published
27 Қар. 2014

RSC Adv., 2015,5, 1378-1384

Surface-enhanced Raman spectroscopy using a coffee-ring-type three-dimensional silver nanostructure

R. Hara, T. Fukuoka, R. Takahashi, Y. Utsumi and A. Yamaguchi, RSC Adv., 2015, 5, 1378 DOI: 10.1039/C4RA09309G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements