POS5-0616
Tannic Acid-Modified Silica Nanoparticles as Versatile Interfacial Agents for UV-Stable, High-Sensitivity NO₂ Detection in P3HT-Based Organic Field-Effect Transistors
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Divya Panikar (Chonnam National University)
Co-Author(s)
Abstract
Organic field-effect transistors (OFETs) offer a promising route toward room-temperature gas sensing, yet achieving simultaneous high sensitivity and long-term UV photostability remains a major unmet challenge in conjugated polymer-based devices. This work presents a novel organic–inorganic hybrid strategy to address both limitations by incorporating tannic acid-functionalized silica nanoparticles (TASi) into poly(3-hexylthiophene) (P3HT) active layers for NO₂ sensing applications. A modified sol–gel approach enables uniform tannic acid coating on silica nanoparticles, promoting strong interfacial coupling with P3HT and inducing favorable morphological reorganization within the hybrid film. Systematic compositional studies reveal a clear decoupling between optimal charge transport and gas-sensing performance, offering new insights into the governing sensing mechanisms, including analyte diffusion and interfacial interactions. Notably, the tannic acid shell imparts substantial UV-shielding and radical-scavenging functionality, markedly enhancing device photostability compared to conventional systems. This work establishes TASi as a multifunctional interfacial modulator and presents a scalable design strategy for next-generation flexible, durable environmental monitoring devices.
