KAJIAN PENGARUH LAPISAN NANOPARTIKEL COBALT FERRITE (CoFe2O4) TERHADAP PERGESERAN SUDUT SURFACE PLASMON RESONANCE (SPR) MENGGUNAKAN KONFIGURASI KRETSCHMANN-PERAK TERMODIFIKASI DI BAWAH PENGARUH MEDAN MAGNET LUAR; THE STUDY OF THE EFFECT OF COBALT FERRITE (CoFe2O4) NANOPARTICLES LAYER ON THE SHIFT OF SURFACE PLASMON RESONANCE (SPR) ANGLE USING MODIFIED SILVER-KRETSCHMANN CONFIGURATION UNDER EXTERNAL MAGNETIC FIELD

Mayasari, Rina Dewi, Kamsul Abraha

2015 | Disertasi | FMIPA

The shift of surface plasmon resonance (SPR) angle at the silver-Kretschmann configuration deposited by cobalt ferrite (CoFe2O4) nanoparticles has been studied experimentally under external magnetic field. Three samples of CoFe2O4 nanoparticles with different size, i.e. 1,68 nm for sample A; 1,95 nm for sample B; dan 5,87 for sample C, were synthesized by co-precipitation method. Based on X-Ray Diffraction (XRD) result, the samples formed CoFe2O4 phase with cubic inverse spinel structure. The scanning electron microscope-energy dispersive spectroscopy (SEM-EDAX) results show that the samples may have nanoscale size and contain impurities from the residual material substances. The vibrating sample magnetometer (VSM) results give information that the magnetic hysteresis loop of the samples get exchange bias phenomenon. The deposition of three samples shift the reference of SPR angle (prism/Ag) with different values, i.e. 0,10°; 0,10°; and 0,30°, with the uncertainty each of about ±0,05° for sample A, B, and C respectively. The SPR angles of sample A, B, and C shift of about 0,30°; 0,30°; dan 0,50°, with the uncertainty each of about ±0,05° respectively after the configuration system of prism/Ag/np-CoFe2O4 was applied by external magnetic field. In addition, the two different magnetic field directions which was applied to sample B confirmed that the SPR shift has different value, i.e. (0,30°±0,05°) dan (0,60°±0,05°). The respond of CoFe2O4 nanoparticles to the shift of SPR angle gives the potential as smart materials at SPR system.

Kata Kunci : surface plasmon resonance (SPR); Kretschmann configuration; CoFe2O4 nanoparticles; co-precipitation; external magnetic field