ISOLATION OF CATECHINS FROM WHITE TEA AND ANTIBACTERIAL PROPERTIES TEST AGAINST STAPHYLOCOCCUS EPIDERMIDIS

• Main Author: AYU ANDARI NIM:10513053, GAYATRI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27463
• Institution: Institut Teknologi Bandung

Polyaniline (PAni) is one of conductive polymers which is being subject to research because its attractive <br /> <br /> <br /> properties and can be applied for modern technology. PAni is one of the easiest synthesized polymers, <br /> <br /> <br /> either by chemical reaction or electrochemical. In this study, the polyaniline was synthesized using pulse <br /> <br /> <br /> electropolymerization method by varying the percent duty, HCl concentration, and aniline concentration. <br /> <br /> <br /> Variation of percent duty used was 50; 60; 65; 75; 80; 83,3; and 85,7%. Variation of HCl concentration <br /> <br /> <br /> used was 1; 1,5; 2; 2,5; and 3 M. Variation of aniline concentration used was 0,25; 0,5; 0,75; 1; and 1,25 <br /> <br /> <br /> M. PAni was characterized using FTIR ATR spectroscopy, Raman spectroscopy, SEM, and measured its <br /> <br /> <br /> cell performance by dye-sensitized solar cell (DSSC). The results of FTIR ATR spectroscopy show that <br /> <br /> <br /> PAni has distinctive peaks of emeraldine, namely vibration of quinonoid ring and benzenoid ring, <br /> <br /> <br /> vibration C-N, vibration bend C-H. In addition, there is a peak showing the formation of phenazine in <br /> <br /> <br /> PANi polymer chains. In the Raman spectroscopy from variation of percent duty, more intense peak <br /> <br /> <br /> appear at 1520 cm-1 (duty 60% and 65%), 1481 cm-1 (duty 75%) and 1483 cm-1 (duty 80-85,7 %) showing <br /> <br /> <br /> the peak of vibration C=N quinonoid. In variation of HCl concentration, Raman shifts at 1191 cm-1 and <br /> <br /> <br /> 1623 cm-1, indicating bending vibration of C-H benzenoid and vibration of C-C benzenoid, were <br /> <br /> <br /> increased after HCl concentration was increased to 1,5 M. In variation of aniline concentration, Raman <br /> <br /> <br /> shift at 1568 cm-1, which shows the vibration of C=C quinonoid, very intense at aniline concentration <br /> <br /> <br /> 1,25 M. In the SEM, the PAni was synthesized using pulse electropolymerization method have fibershaped <br /> <br /> <br /> morphology with a rough surface. From the FESEM, the surface of PAni's morphology is covered <br /> <br /> <br /> by bulge like a thorn with size 6-11 nm. The diameter of polyaniline ranges from 100-550 nm. In <br /> <br /> <br /> characterization of DSSC using solar simulator highest efficiency is 0,76% when percent duty is 50%, <br /> <br /> <br /> concentration of HCl is 2 M, and concentration of aniline is 0,75 M.