All-polymer-based ammonia gas sensor: applying insights from the morphology-driven ac electrical performance
| Autor: | Ana Carolina Kelmer, Cleidinéia Cavalcante da Costa, Rodrigo Fernando Bianchi |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Polímeros, Vol 34, Iss 1 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1678-5169 0104-1428 |
| DOI: | 10.1590/0104-1428.20230070 |
| Popis: | Abstract This paper investigates the electrical, morphological, and mechanical behavior of ultrathin layer-by-layer polyaniline/poly(vinyl sulfonic acid) (PANI/PVS) ultrathin films for ammonia gas sensing. Atomic force microscopy shows that the PANI/PVS surface's roughness increases almost linearly with the number of PANI/PVS bilayers, while the surface morphology varies from a rod-like structure to a film-like architecture. Impedance measurements and their representation by a Cole-Cole model confirm this transition at ~15 bilayers. The designed sensor shows low response time (< 1 min), an optimal operating frequency range (1–100 Hz), high stability and sensibility to ammonia (~ 98 kΩ/ppm), and low sensibility to strain (~ 3.6 kΩ/%). This study suggests that hopping carriers' concentration remains constant, and hopping carriers' mobility changes with the number of bilayers. The simultaneous analysis of morphology with complex impedance measurements is a strategy for enhancing the electrical performance of low-cost and flexible organic sensing devices. |
| Databáze: | Directory of Open Access Journals |
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