Deteksi Formalin Menggunakan Surface Plasmon Resonance (SPR) Berbasis Nanopartikel Perak sebagai Pengembangan Awal Teknologi Food Safety

Abstract

<span>The phenomena of surface plasmon resonance (SPR) has been observed. SPR is reflectance <span>curve as a function of incident angle in Kretschmann configuration. Surface plasmon is elec<span>tromagnetic waves propagation in the interface area between metal and dielectric that can be <span>excited by using attenuated total reflection (ATR) method. The result of experiment explains <span>that the SPR angle on the thin film system of the prism/silver 1 and the prism/silver 2 is (42.8<br /><span>± 0,05)º with the reflectance value 0.32 and 0.44 respectively. On the prism/silver/silver <span>nanoparticle system, it is obtained that SPR angle value is (4,29 ± 0,05) with the reflectance <span>value 0.29 for the silver 1 and 0.31 for the silver 2. After the thin film system is added with <span>40% of formalin, SPR angle becomes (43,0 ± 0,05)º with the reflectance value 0.44. Then, af<span>ter the thin film system is added with 100% of formalin, SPR angle becomes (43,2 ± 0,05)º<br /><span>with the reflectance value 0.4. The shifting SPR angle shows that SPR have capability as <span>formalin sensor.</span></span></span></span></span></span></span></span></span></span></span><br /></span>