Silver Nanowire on Paper as a Low-Cost Sers Substrate for Methylene Blue Detection
Laureen Ida M. Ballesteros1, Horace Andrew F. Husay2, Wilfredo Bisquera1, Debinya B. Buenafe1, Renebeth B. Payod2*, Elmer S. Estacio2, Arnel A. Salvador2, Armando S. Somintac2
1Materials Science and Engineering Program, University of the Philippines - Diliman, Quezon City, Metro Manila, Philippines
2National Institute of Physics, University of the Philippines - Diliman, Quezon City, Metro Manila, Philippines
* presenting author:Renebeth Payod,
A simple and cost-effective surface-enhanced Raman scattering (SERS) substrate which can be used to characterize low concentrations of methylene blue (MB) in water is presented. Silver nanowire (Ag NW) suspension dispersed on paper (KimWipes®) was utilized as SERS platform. A drop (0.5 μL) of MB solution (8.0 ppm) was subjected to Raman spectroscopy using both an ordinary paper and paper with Ag NW. The samples were allowed to dry in air before characterization. Characteristic Raman peaks of MB at 482 and 1626 cm-1 were observed and were attributed to the C-C stretching and C-N-C skeletal vibrational modes, respectively. The obtained results reveal a more intense Raman spectra compared to the normal (non-SERS) counterpart. Moreover, photodegraded MB dye was tested for proof-of-concept demonstration and to show the SERS capability of the Ag NW substrate to detect trace amounts of the dye. In addition to the observed enhancement of Raman shift, additional peaks were also seen in the photodegraded MB spectra. A 5.77 enhancement factor can be attributed to chemical effect. These results suggest that the Ag NW on paper has a potential application as SERS substrate for trace detection of MB in water.

Keywords: Surface-enhanced Raman scattering, Methylene blue dye, Ag nanowires, Dye photodegradation