Electrochemical Performance of pH Sensor Based on LbL Films of Polyaniline-Gum Arabic Nanocomposite and Graphene Oxide. Issue 4 (14th February 2020)

• Record Type: Journal Article
• Authors: Oliveira, Rafaela D.; Pscheidt, Juliane; Santos, Cleverson S.; Ferreira, Rodolfo T.; Marciniuk, Gustavo; Garcia, Jarem R.; Vidotti, Marcio; Marchesi, Luís F.; Pessoa, Christiana A.
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 4(2020)
• Publication Date: 2020-02-14
• Subjects: Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/ab721d
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Miniaturized pH sensors have attracted the attention mostly due to their applications for monitoring chemical and biological processes. The modification of electrodes by Layer-by-Layer (LbL) technique results in films with nanometric structure for application in devices with different sizes. In this paper, an electrode modified with LbL films of polyaniline-gum Arabic nanocomposite (PANI-GA) and graphene oxide (GO), designed (PANI-GA/GO)3, was applied as a potentiometric pH sensor based on states of oxidation PANI. The pH measurements were performed in BR buffer solution and a linear range was observed from pH 2 to 7. The detection limit (DL) and quantification limit (QL) were of pH = 0.465 and 1.55, respectively. Analytical curves were obtained in triplicate and inter-assay precision was calculated for the system, demonstrating good results with relative standard deviation (RSD) of 3.7% for five measurements in different days. The (PANI-GA/GO)3 LbL film showed promising results for its use in the development of potentiometric pH sensor.