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This study examined the effect of Zn 2+  ion substitution on Zn x Mn (1-x)  Fe 2 O 4  nanoparticles (x = 0.2, 0.4, 0.6, 0.8) towards signal Surface Plasmon Resonance (SPR). The co-precipitation method synthesised the nanoparticles at a temperature of 90°C. The X-Ray Diffraction (XRD) results showed a polycrystalline structure with a crystallite size varied from 19.05 nm to 19.77 nm. In addition, as the Zn element increased in the Zn x Mn (1-x) Fe 2 O 4  nanoparticles, the degree of crystallinity increased by 21.72%, respectively. The optical properties of the nanoparticles Zn x Mn (1-x)  Fe 2 O 4  indicate absorbance at wavelengths of 330.36–331.74 nm. The absorbance level increased as the Zn element decreased, resulting a direct optical gap of 3.47 eV and an indirect optical gap of 3.23 eV. The Attenuated Total Reflection (ATR) curve in the SPR biosensor indicated a shift in the reflective angle of the Prism/Au/Air configuration, which is 47.78° on Prisma/Au/nanoparticle of Zn 0.8 Mn 0.2 Fe 2 O 4 /air by 50.75°, and the prism/Au/nanoparticle of Zn 0.2 Mn 0.8 Fe 2  O 4 /air by 51.04°. The substitution of Zn ions in the compound Zn x Mn (1-x) Fe 2 O 4  affects the resulting ATR curve. The shift in the SPR angle is caused by changes in the refractive index in each layer which is influenced by the concentration of each material which has an impact on the absorbance ability and photon reflectance. This research has the potential to continue with the testing of dielectric and magnetic properties, as well as special testing for biological analytes compatible with Zn x Mn (1-x) Fe 2 O 4  nanoparticles.

materials research innovations

The effect of Zn 2+  ion substitution on nanoparticles of Zn x Mn (1-X)  Fe 2 O 4  (X = 0.2, 0.4, 0.6, 0.8) towards signal surface plasmon resonance (SPR)