Water Sensor for a Nonaqueous Solvent with Poly(1,5-diaminonapthalene) Nanofibers

Abstract

A water sensor for a nonaqueous solvent was fabricated using poly(1,5-diaminonapthalene (DAN) nanofibers, which were prepared through a catalytic chemical polymerization of the DAN monomer using Fe(III) salt as the catalyst. Poly(1,5-DAN) nanofibers were characterized by atomic force microscope (AFM), transmission electron microscope (TEM), scanning electron microscope (SEM), and UV-vis spectroscopy. The electrochemical properties of poly(1,5-DAN) nanofibers were investigated using cyclic voltammetry (CV). The electrochemical activity of poly(1,5-DAN) nanofibers was utilized for water sensing. The fabrication of water sensor was followed by placing one drop (about 2 microL) of 0.01% poly(1,5-DAN) nanofibers solution in the gap between two split gold electrodes (PBSA) and completely dried. The response of the water sensor in an acetonitrile solution was evaluated under optimized conditions. The linear dynamic range was from 0.05 to 20%, and the detection limit was determined to be 0.01%. The response of this sensor was shown to be comparable to that obtained with the Karl Fischer titration method.

Colorimetric and Fluorescent Dual Mode Sensing of Alcoholic Strength in Spirit Samples with Stimuli-Responsive Infinite Coordination Polymers

“…For comparison, we have also detected the AS values of the real spirit samples with Karl Fischer method. 38,39 As displayed in Figure 8 and Table 1, the results obtained with our assay correlate well with those obtained with Karl Fischer method and certified by the suppliers, again validating the colorimetric and fluorescent dual mode sensing system demonstrated here for effectively quantifying AS in real samples with the stimuliresponsive RhB/Zn(bix) particles as the optical probe. …”

Electrochemical Sensors

“…Rahman and colleagues synthesized nanofibers from poly(1,5-diaminonapthalene) for use as a water sensor for non-aqueous solvents (71). The nanofibers were suspended between two closely-spaced gold electrodes, forming the water sensor.…”

Analysis of water in room temperature ionic liquids by linear sweep, differential pulse and square wave cathodic stripping voltammetries

“…In most cases, water in non-aqueous solvents (including RTILs) is quantified by Karl Fischer titration (KFT) as a reference method [21][22][23]. There are two main variants of this determination: the volumetric titration and the coulometric one, the latter being the procedure that requires the lesser amount of sample and having the greater control over the determination of water.…”