PENGARUH VARIASI SCAN RATE POTENSIOSTAT TERHADAP NILAI IMPEDANSI, TOPOGRAFI DAN MORFOLOGI LAPISAN TIPIS POLIANILIN

THE EFFECTS OF POTENTIOSTAT SCAN RATE VARIATION ON IMPEDANCE VALUE, TOPOGRAPHY, AND MORPHOLOGY OF THE POLYANILINE THIN FILM

Pengaruh besar scan rate potensiostat terhadap impedansi, topografi, dan morfologi lapisan tipis Polianilin (PANi) telah diobservasi pada penelitian ini. PANi dideposisi diatas permukaan sensor Quartz Crystal Microbalance (QCM) dengan variasi scan rate diamati perubahan nilai impedansi dengan pengujian impedance analyzer. Topografi lapisan diamati dengan pengujian Topography Measurement System (TMS) sedangkan morfologi lapisan diamati menggunakan mikroskop optik dan Scanning Electron Microscope (SEM). Hasil penelitian menunjukkan bahwa sampel terbaik yaitu pada scan rate 10mV/s, dengan nilai impedansi yang rendah dan menandakan lapisan bersifat rigid. Variasi scan rate dapat mempengaruhi nilai impedansi, tetapi tidak signifikan dan tidak menunjukkan adanya efek damping pada QCM. Dari pengamatan topografi dan morfologi, lapisan yang homogen terdeposisi pada scan rate rendah, sedangkan scan rate tinggi menghasilkan lapisan yang tidak homogen.

Kata kunci: PANi, Scan Rate, Potentiostat

The effects of potentiostat scan rate on the impedance, topography, and morphology of the Polyaniline (PANi) thin film has observed in this study. PANi has deposited on the surface of the Quartz Crystal Microbalance (QCM) with various scan rates, and changes in the impedance value have observed through an impedance analyzer test. The layer topography has observed by Topography Measurement System (TMS), while the layer morphology has observed using optical microscopy and Scanning Electron Microscope (SEM). The results have shown that the best sample has a scan rate of 10 mV/s, with a low impedance value indicating the layer has rigid. The variation in scan rate can affect the impedance value, but it is not significant and does not indicate a damping effect on QCM. A homogeneous layer is deposited at a low scan rate from topography and morphological observations, while a high scan rate results in an inhomogeneous layer.

Keywords: PANi, Scan Rate, Electropolymerization