KAJIAN SIFAT LISTRIK NANOFIBER POLIANILIN YANG DISINTESIS DENGAN METODE POLIMERISASI INTERFASIAL DAN POTENSINYA SEBAGAI BIOSENSOR BERBASIS SURFACE PLASMON RESONANCE (SPR) STUDY ON THE ELECTRICAL PROPERTIES OF POLYANILINE; NANOFIBERS SYNTHESIZED BY INTERFACIAL POLYMERIZATION METHOD AND THEIR POTENTIAL AS SURFACE PLASMON RESONANCE (SPR) BASED BIOSENSORS

Rajabiah, Nurlaila, Kamsul Abraha

2016 | Disertasi | FMIPA

The electrical properties of polyaniline nanofiber synthesized by interfacial polymerization method have been studied to determine its potential as an biorecognition element in biosensor-based surface plasmon resonance (SPR). The average diameter of the scanning electron microscope (SEM) results on five samples using polyaniline nanofiber doped hydrochloric acid (HCl) with variations in dopant concentration of about 0.6 M, 1.2 M, 1.8 M, 2.4 M, and 3.0 M shows that the higher HCl concentration is used in the synthesis process, the smaller polyaniline nanofiber diameter can be obtained and the fiber results were formed more clearly. The fourier transform infrared spectroscopy (FTIR) result show that there is a shift in the peak vibration characteristics from a standard curve for each HCl concentration used. The result of UV-Visible spectroscopy shows that the higher HCl concentration is used, the smaller values of absorbance is obtained. The measurement result of electrical resistance (Rs) using LCR meter at a frequency of 1-100 kHz show that the higher molarity dopant HCl is used, the resistance value decreases. The higher average value of the electrical conductance (Gs) was obtained after increasing dopant concentration. The polyaniline conductance is affected by the protonation degree of the imine nitrogen on the polyaniline chain. The value of the real (? ' ) and imaginer part (? " ) of dielectric constants in all samples show that the increasing frequency decreases the ? ' and ? " value, but the value tends to independent at the frequency above 10 kHz, it is related to the mechanism of polarization. The addition of polyaniline nanofiber layer of each sample concentration which have the value of ? ' dan? " at the frequency of about 100 kHz showed a shift in the SPR angle. It shows that the electrical properties of polyaniline nanofiber have potential as an biorecognition element in SPR-based biosensors using Kretchmann modified configuration.

Kata Kunci : polyaniline nanofibers; interfacial polymerization; resistance; conductance; dielectric constant; biosensor-based SPR