[11a-PB3-1~11] 13.5 Semiconductor devices/ Interconnect/ Integration technologies

▲ [11a-PB3-6] Sensing Behavior of Polyaniline Supported Gold Atomic Clusters Propanol Sensor

〇(M1)Yuan Chien¹, Parthojit Chakraborty¹, Wan-Ting Chiu², Tso-Fu Mark Chang¹, Takamichi Nakamoto¹, Masato Sone¹ (1.Tokyo Tech, 2.U Tokyo)

Keywords:gas sensor, polyaniline, atomic gold cluster

In this study, polyaniline (PANI) supported gold atomic clusters electrodes were fabricated through a lucid two-step process for detecting 1-propanol and 2-propanol. The PANI was electro-polymerized onto a pretreated commercial platinum disk electrode from aniline monomers in tetrafluoroboric acid. Gold atomic clusters were deposited onto PANI/Pt electrodes by a cyclic process with a laboratory developed flow injection analysis system. For propanol oxidation reactions, the modified Au/PANI electrode showed better catalytic activity when compared with an as-prepared non-modified PANI electrode and higher catalytic efficiency when compared with bulk gold electrode. The electrodes were taken as the working electrodes in a standard three-electrode electrochemical sensor for 1-propanol and 2-propanol sensing. The Au/PANI electrodes-based sensor showed high sensitivity and fast response toward propanol oxidation reactions at room temperature. The cyclic voltammetric (CV) detection of 1-propanol showed a linear dependence of current response versus concentration from 10^-5 M to 10^-2 M with a sensitivity of 42.86 μA / (mM cm²) (R²=0.994). Current responses were sampled at potential of first 1-propanol oxidation peak (≈-0.04V vs SHE). The CV detection of 2-propanol also showed a quantifiable linear dependence of current response versus concentration.