The effect of the concentration of the stabilizer in the formation of a silver nanoparticle on the phenomenon of Surface Plasmon Resonance (SPR) as an active material for biosensor
Penulis/Author
LUFSYI MAHMUDIN (1); D Darwis (2); Prof. Dr.Eng. Edi Suharyadi, S.Si., M.Eng. (3); Prof. Dr. Kamsul Abraha (4); Prof. Dr. Agung Bambang Setio Utomo, S.U. (5)
Tanggal/Date
2 2021
Kata Kunci/Keyword
Abstrak/Abstract
It has been successfully synthesized silver nanoparticles by chemical reduction
methods. Silver nitrate (AgNO3) is used as a metal precursor and trisodium citrate as a reducing
agent with varying concentrations of the stabilizer PVA. The UV-Vis spectrometer shows that
increasing the mass concentration of the stabilizer can sharpen the surface plasmon maximum
absorption band and there is a shift in the maximum absorption band towards a larger
wavelength. This shift occurred from a wavelength of 428.79 nm at a PVA concentration of 0.85
ppm shifted to a wavelength of 429.01 nm, 430.93 nm and 434.13 nm for each PVA
concentration of 1.70 ppm, 2.55 ppm and 4.25 ppm. The observation results of the SPR
phenomenon showed a shift in the SPR angle when a thin layer of silver as the active ingredient
of the sensor was coated with silver nanoparticles. This addition also sharpens the reflectance
value. The SPR angle shift and the increase in reflectance value are caused by changes in the
surface plasmon wave constant, which becomes a reference that the SPR phenomenon by
modifying the sensing surface using an additional layer of silver nanoparticles can increase its
sensitivity.
