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Optimized Drop-Casted Polyaniline Thin Films for High-Sensitivity Electrochemical and Optical pH Sensors.
Mücke, Bruna Eduarda Darolt; Rossignatti, Beatriz Cotting; Abegão, Luis Miguel Gomes; Barbosa, Martin Schwellberger; Mello, Hugo José Nogueira Pedroza Dias.
Afiliação
  • Mücke BED; Physics of Materials Group, Institute of Physics, Federal University of Goiás, Samambaia Campus, Goiânia 74001-970, GO, Brazil.
  • Rossignatti BC; Physics of Materials Group, Institute of Physics, Federal University of Goiás, Samambaia Campus, Goiânia 74001-970, GO, Brazil.
  • Abegão LMG; Photonics Group, Physics Institute, Federal University of Goiás, Samambaia Campus, Goiânia 74001-970, GO, Brazil.
  • Barbosa MS; Institute of Chemistry, Federal University of Goiás, Samambaia Campus, Goiânia 74001-970, GO, Brazil.
  • Mello HJNPD; Physics of Materials Group, Institute of Physics, Federal University of Goiás, Samambaia Campus, Goiânia 74001-970, GO, Brazil.
Polymers (Basel) ; 16(19)2024 Oct 01.
Article em En | MEDLINE | ID: mdl-39408500
ABSTRACT
Conducting polymers used in chemical sensors are attractive because of their ability to confer reversible properties controlled by the doping/de-doping process. Polyaniline (PANI) is one of the most prominent materials used due to its ease of synthesis, tailored properties, and higher stability. Here, PANI thin films deposited by the drop-casting method on fluorine-doped tin oxide (FTO) substrates were used in electrochemical and optical sensors for pH measurement. The response of the devices was correlated with the deposition parameters; namely, the volume of deposition solution dropped on the substrate and the concentration of the solution, which was determined by the weight ratio of polymer to solvent. The characterisation of the samples aimed to determine the structure-property relationship of the films and showed that the chemical properties, oxidation states, and protonation level are similar for all samples, as concluded from the cyclic voltammetry and UV-VIS spectroscopic analysis. The sensing performance of the PANI film is correlated with its relative physical properties, thickness, and surface roughness. The highest electrochemical sensitivity obtained was 127.3 ± 6.2 mV/pH, twice the Nernst limit-the highest pH sensitivity reported to our knowledge-from the thicker and rougher sample. The highest optical sensitivity, 0.45 ± 0.05 1/pH, was obtained from a less rough sample, which is desirable as it reduces light scattering and sample oxidation. The results presented demonstrate the importance of understanding the structure-property relationship of materials for optimised sensors and their potential applications where high-sensitivity pH measurement is required.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Polymers (Basel) Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Suíça

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Polymers (Basel) Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Brasil País de publicação: Suíça