Nanostructured polyaniline thin films as pH sensing membranes in FET-based devices

Autor(es)

Vieira, Nirton C. S. ^[1] ; Fernandes, Edson G. R. ^[1] ; Faceto, Angelo D. ^[1] ; Zucolotto, Valtencir ^[1] ; Guimaraes, Francisco E. G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 160, n. 1, p. 312-317, DEC 15 2011.
• Citações Web of Science: 24

Resumo

Polyaniline (PANI) has become an important conducting polymer for sensing due to its morphological and electrical properties. However, the processing of polyaniline in the form of nanostructured thin films is often limited by the low solubility of the polymer in water. We synthesized nanostructured polyaniline (N-PANI) aimed at improving its solubility to form layer-by-layer (LbL) thin films in conjunction with poly(vinyl sulfonic acid) (PVS) as counter ion. N-PANI was characterized via spectroscopic measurements and SEM images. After assembled as LbL thin films onto gold (Au) substrates, the PVS/N-PANI were employed as separative extended gate pH sensing membrane in FET-based devices presenting pH sensitivity around 58 mV/pH with small voltage drift. The results suggest that N-PANI can be easily processed to form suitable thin films for pH sensing and can be combined with biomolecules to be applied in FET-based biosensors. (C) 2011 Elsevier B.V. All rights reserved. (AU)