P1GS.23 - Hydrogen Sulfide Gas Sensor Based on Conducting Polyimide/Gold Nanoparticles

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-1 - Gas Sensors
K. Santiago, L. Padua - Department of Chemistry, College of Science, University of Santo Tomas, Manila (Philippines), J. Yeh - Department of Chemistry, Center for Nanotechnology, Chung Yuan Christian University (Taiwan)
562 - 563


This work presents the development of H2S gas sensor based on conducting polyimide/gold nanoparticles (CPI/AuNPs). The sensing membrane was prepared via a facile two-step process of polymerization and imidization to obtain CPI, followed by incorporation of AuNPs into the polymer matrix through reduction of HAuCl4. The success of synthesis was confirmed via Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy-energy dispersive X-rays (SEM-EDX). The FTIR spectra confirmed the presence of functional groups that constitute the polymer, while its morphological structure and EDX spectra revealed small white globules on the surface of the polymer, and Au peaks, respectively, that could be attributed to the incorporation of AuNPs. The gas sensor was constructed by drop casting CPI/AuNPs onto two circular gold substrates separated by a gap distance of 500 μm. The fabricated CPI/AuNPs-based gas sensor showed a sensitivity of -0.29 % ppm-1 H 2S from 50 to 300 ppm H2S at a linearity of 0.9731 (n=3). The sensor provided a stable response reading at an average response time of 51 seconds, which can be easily recovered after an average of 103 seconds. The response was highly repeatable and reproducible with an RSD of 6.05% and 5.96%, respectively. The sensor shows high reversibility with an RSD of 8.42%.