Alifatul Azkia Bakhrin, Nugrahani Primary Putri
Eucalyptus oil has varying qualities due to differences in chemical compound content, requiring a simple and sensitive analysis method to distinguish its aroma. Polyaniline (PANI) is a stable conductive polymer that is easy to synthesize and has electrical properties that can be controlled through doping, making it a potential sensor material. In this study, a thin layer of PANI was synthesized on an ITO substrate through electrolysis using cyclic voltammetry. Its conductivity was then tested using a four-point probe method based on voltage changes and further characterized using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The results showed a nanofiber morphology that supports high conductivity and contributes to sensor sensitivity. Testing showed significant voltage changes in response to variations in eucalyptus oil volume, with the highest sensitivity of 6% at a volume of 1.5 mL. In addition, this sensor was able to distinguish between three brands of eucalyptus oil based on differences in voltage response, demonstrating its selectivity. This study proves the potential of PANI as a flexible and effective sensor for analyzing the quality of eucalyptus oil. © 2026, Walailak University. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Surabaya, Surabaya, 60231, Indonesia
