title: An Electrochemical pH Sensor Based on the Amino-Functionalized Graphene and Polyaniline Composite Film.
abstract: Conventional glass-based pH sensors are usually fragile and space consuming. Herein, a miniature electrochemical pH sensor based on amino-functionalized graphene fragments and polyaniline (NH2-G/PANI) composite film is developed via simply one-pot electrochemical polymerization on the ITO-coated glass substrates. Cyclic Voltammetry (CV), Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Raman Spectra are involved to confirm the successful synthesis and to characterize the properties of the NH2-G/PANI composite film. The developed electrochemical pH sensor presents fast response, high sensitivity (51.1 mV/pH) and wide detection range when applied to PBS solutions of pH values from 1 to 11. The robust reproducibility and good stability of the developed pH sensors are investigated as well. Compared to the conventional glass-based pH meters, the NH2-G/PANI composite film-based pH sensor could be a promising contender for the flexible and miniaturized pH-sensing devices.
authors.forename: W
authors.initials: W
authors.lastname: Su
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: Xianting
authors.initials: X
authors.lastname: Ding
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053761:Nanocomposites / Q000737:chemistry*; D012680:Sensitivity and Specificity
chemical_list: D000814:Aniline Compounds; C416807:polyaniline; D006108:Graphite