POS5-0349
Enhanced NO2 Sensing in P3HT Organic Gas Sensors by Metal Cluster Controlled UiO-66-NH2 MOFs
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Choi seulgi (Incheon National University)
Co-Author(s)
Abstract
Organic gas sensors have attracted attention as next generation sensing platforms for environmental monitoring and industrial safety because of their low temperature processability, light weight, and mechanical flexibility. However, conventional polymer semiconductor based sensors have limited sensing performance due to their low surface area and insufficient gas adsorption sites. In this study, cluster controlled UiO-66-NH₂ metal organic frameworks were incorporated into a poly(3-hexylthiophene) sensing layer to enhance gas adsorption capability and investigate the effect of metal clusters on NO₂ gas sensing performance.
Zr-, Hf-, and Ce-based UiO-66-NH₂ MOFs were synthesized while maintaining the same fcu topology. PXRD analysis confirmed that all MOFs had similar crystallinity, and SEM-EDS mapping verified the uniform distribution of each metal element. P3HT/MOF blend films were fabricated using 30 wt% MOF, which was selected as the optimized condition from the NO₂ sensing test. UV-Vis and transfer curve analyses confirmed that MOF incorporation did not significantly disturb the electronic structure or charge transport properties of P3HT.
The gas sensing performance was evaluated using repeated exposure to 10 ppm NO₂ and dynamic sensing tests from 10 to 50 ppm under fixed gate and drain voltages of −20 V. Among the cluster controlled MOF sensors, the Hf-based MOF sensor exhibited the highest responsivity and sensitivity, as well as fast response and recovery behavior. In contrast, the Ce-based MOF sensor showed relatively low sensing performance, which was attributed to its lower specific surface area and limited accessible adsorption sites. These results demonstrate that metal cluster engineering of MOFs is an effective strategy for improving the gas adsorption capability and NO₂ sensing performance of P3HT based organic gas sensors.
Zr-, Hf-, and Ce-based UiO-66-NH₂ MOFs were synthesized while maintaining the same fcu topology. PXRD analysis confirmed that all MOFs had similar crystallinity, and SEM-EDS mapping verified the uniform distribution of each metal element. P3HT/MOF blend films were fabricated using 30 wt% MOF, which was selected as the optimized condition from the NO₂ sensing test. UV-Vis and transfer curve analyses confirmed that MOF incorporation did not significantly disturb the electronic structure or charge transport properties of P3HT.
The gas sensing performance was evaluated using repeated exposure to 10 ppm NO₂ and dynamic sensing tests from 10 to 50 ppm under fixed gate and drain voltages of −20 V. Among the cluster controlled MOF sensors, the Hf-based MOF sensor exhibited the highest responsivity and sensitivity, as well as fast response and recovery behavior. In contrast, the Ce-based MOF sensor showed relatively low sensing performance, which was attributed to its lower specific surface area and limited accessible adsorption sites. These results demonstrate that metal cluster engineering of MOFs is an effective strategy for improving the gas adsorption capability and NO₂ sensing performance of P3HT based organic gas sensors.
