Issue 2, 2015

Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy

Abstract

The potential of a nanoporous Ag microstructure (np-AgMs) for use as a single particle for surface-enhanced Raman scattering spectroscopy (SERS), with the added advantages of being easy to manipulate and reusable, was successfully demonstrated. The np-AgMs with interconnected pore and controllable pore size were fabricated from symmetric hexapod AgCl via a galvanic replacement reaction in NaCl solution with zinc (Zn) as the sacrificed metal. The clean surface of np-AgMs enables rapid surface functionalization with easy handling and sample preparation as no particle aggregation occurs. The SERS acquisition spots on the np-AgMs can be visually selected using a normal Raman microscope. SERS spectra of p-aminothiophenol (PATP) with a concentration range of 10−8–10−3 M can be achieved. The position-dependent enhancement of np-AgMs was expendably evaluated. The signal-position correlation was confirmed by electric filed enhancement obtained from Finite-difference time-domain (FDTD) calculation. In addition, the highly stable substrate showed insignificant loss of the enhanced Raman signal after several cycles of chemical re-generation. Finally, the potential application of np-AgMs in label-free detection of biomolecules including hemoprotein, protein without chromophore and DNA strains at low concentration of 500 μg mL−1 was demonstrated.

Graphical abstract: Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy

Supplementary files

Article information

Article type
Paper
Submitted
07 okt. 2014
Accepted
18 nóv. 2014
First published
19 nóv. 2014

RSC Adv., 2015,5, 1391-1397

Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe and Y. Ozaki, RSC Adv., 2015, 5, 1391 DOI: 10.1039/C4RA11890A

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