SINTESIS DAN KARAKTERISTIK LAPISAN TIPIS POLIANILIN SEBAGAI BAHAN AKTIF SENSOR GAS BTX (BENZENE, TOLUENE, DAN XYLENE)

SYNTHESIS AND CHARACTERISTICS OF POLYANILINE THIN COATING AS ACTIVE MATERIALS OF BTX (BENZENE, TOLUENE AND XYLENE) GAS SENSORS 

Polianilin (PANi) adalah salah satu jenis polimer konduktif yang dapat disintesis dengan menggunakan metode elektrodeposisi pada subtrat ITO. Penelitian ini bertujuan untuk menganalisis hasil dan mendeskripsikan hasil dari sensitivitas, reusable, response time dan recovery time PANi terhadap gas BTX. Lapisan tipis PANi terbentuk pada permukaan substrat ITO dengan menggunakan scan rate sebesar 100 mV/s dan siklus sebanyak 10. Hasil uji spektroskopi PANi sebelum dan sesudah terpapar gas Benzene tidak menunjukkan perbedaan dan masih dalam range gugus fungsi PANi. Untuk mengetahui performa penginderaan lapisan PANi terhadap gas analit dilakukan uji resistansi menggunakan Four Point Probe (FPP) dan didapatkan hasil sensitivitas, recovery time, dan response time, yang cenderung meningkat seiring peningkatan konsentrasi gas BTX yang dipaparkan. Pada penginderaan Benzene dengan konsentrasi rendah (2 ppm) didapatkan response time sebesar 34.18 S, recovery time sebesar 30.56 s, dan sensitivitas sebesar 6,48%. Pada penginderaan Benzene dengan konsentrasi tinggi (20 ppm) didapatkan response time sebesar 63.04 s, recovery time sebesar 54.39 s, dan sensitivitas sebesar 11,73 %. Pada penginderaan Toluene dengan konsentrasi rendah (2 ppm) didapatkan response time sebesar 34.08 s, recovery time sebesar 26.78 s, dan sensitivitas sebesar 4,65%. Pada penginderaan Toluene dengan konsentrasi tinggi (20 ppm) didapatkan response time sebesar 52.77 s, recovery time sebesar 50.79 s, dan sensitivitas sebesar 9,39%. Pada penginderaan Xylene dengan konsentrasi rendah (2 ppm) didapatkan response time sebesar 33.76 s, recovery time sebesar 25.56 s, dan sensitivitas sebesar 3.96%. Pada penginderaan Toluene dengan konsentrasi tinggi (10 ppm) didapatkan response time sebesar 50.42 s, recovery time sebesar 45.78 s, dan sensitivitas sebesar 8,64%. Sehingga, lapisan PANi layak digunakan sebagai bahan fungsional sensor gas BTX

Kata kunci : Polianilin, BTX, elektrodeposisi, sensitivitas

Polyaniline (PANi) is a type of conductive polymer that can be synthesized using the electrodeposition method on ITO substrates. This study aims to analyze the results and describe the results of the sensitivity, reusable, response time and recovery time of PANi to BTX gas. A thin PANi layer was formed on the surface of the ITO substrate using a scan rate of 100 mV/s and 10 cycles. The PANi spectroscopy test results before and after exposure to Benzene gas showed no difference and were still within the range of the PANi functional groups. To determine the sensing performance of the PANi layer against analyte gas, a resistance test was carried out using a Four Point Probe (FPP) and the sensitivity, recovery time, and response time results were obtained, which tended to increase with an increase in the concentration of BTX gas exposed. On sensing Benzene at a low concentration (2 ppm), a response time of 34.18 S was obtained, a recovery time of 30.56 s, and a sensitivity of 6.48%. On sensing Benzene with a high concentration (20 ppm), a response time of 63.04 s, a recovery time of 54.39 s, and a sensitivity of 11.73 % were obtained. In sensing Toluene with low concentration (2 ppm), a response time of 34.08 s, a recovery time of 26.78 s, and a sensitivity of 4.65% were obtained. Toluene sensing with high concentrations (20 ppm) obtained a response time of 52.77 s, a recovery time of 50.79 s, and a sensitivity of 9.39%. In Xylene sensing with low concentration (2 ppm), a response time of 33.76 s, a recovery time of 25.56 s, and a sensitivity of 3.96% were obtained. Toluene sensing with high concentration (10 ppm) obtained a response time of 50.42 s, a recovery time of 45.78 s, and a sensitivity of 8.64%. Thus, the PANi layer is suitable for use as a functional material for BTX gas sensors

Keywords : Polyaniline, BTX, electrodeposition, sensitivity