Characterization of All Solid State Hydrogen Ion Selective Electrode Based on PVC-SR Hybrid Membranes

Abstract

Hydrogen ion selective membranes formulated with 3140 RTV silicone rubber (SR) in PVC were studied to extend the life time of solid state ion sensors through improved membrane adhesion. All solid state hydrogen ion selective electrodes were prepared by incorporation of tridodecyl amine (TDDA) as an ionophore, potassium tetrakis[3,5-bis(pchlorophenyl)borate (KTpClPB) as a lipophilic additive, bis(2-ethylhexyl)adipate (DOA) as a plasticizer. Their linear dynamic range was pH 2.0-11.0 and showed the near Nernstian slope of 55.1±0.2 mV/pH (r=0.999). The influences from alkali and alkaline earth metal ions were studied for the response of the final ISE membrane composition. Impedance spectroscopic data showed that the resistance was increased by increasing SR content in PVC. Brewster Angle Microscopy (BAM) image showed clear differences according to the SR compositions in PVC. Life time of the all solid state membrane electrode was extended to about 2 months by preparing the membrane with PVC and SR. The standard reference material from NIST (2181 HEPES Free acid and 2182 NaHEPESate) was tested for the ISE and it gave a good result.

Laser-induced graphene electrodes for electrochemical ion sensing, pesticide monitoring, and water splitting

“…The ISE sensors demonstrated wide linear ranges (0.3-150 mM K + and pH 5.0-8.0), near-Nernstian sensitivity (53.0 mV/ dec for K + ISE and − 56.6 mV/pH for pH ISE), and good dry-storage stability (100% of the initial sensitivity after 40 days for K + ISE and 97% after 44 days for pH ISE). These analytical characteristics of the sensors are comparable or exceed previous reports for nanomaterial-based K + [67] and pH [71,73] solid-state sensors. Practical applicability of the proposed ISEs was confirmed by the analysis of artificial urine that contained 11 metabolites and inorganic ions.…”

“…Another pH ISE based on Pt electrodes with poly(aniline) had sensitivities of 55-59 mV/pH (depending on the ionophore) and remained stable for 1 month [72]. A pH ISE based on a graphite rod demonstrated a sensitivity of − 55 mV/pH and was stable during 2 months [73]. Graphene-based pH ISEs had a sensitivity of − 56 mV/pH, but its storage stability was not tested [21].…”

Integration of an Aerosol-Assisted Deposition Technique for the Deposition of Functional Biomaterials Applied to the Fabrication of Miniaturised Ion Sensors

“…This roughness has an impact on the diffusion layer, which is translated into a difference in the time response and stability of the devices [ 34 , 37 ]. In addition, such roughness can increase the interfacial resistance of the films due to a change on their capacitive behavior [ 38 , 39 , 40 ]. Consequently, the fabrication of highly smooth and homogeneous films is necessary to achieve a systematic study of the effects of thickness in the performance of the ion sensors.…”

A Solid State Polymer‐Coated Electrode Containing a Chiral Crown Ether Derivative for Enantioselective Detection of Phenylglycine Methyl Ester Isomer

“…Thus, the ratio of NPOE to TPU was fixed in 2 : 1 at the subsequent experiment. It had been known that lipophilic additives improved the selectivity [19,20] and the responsibility of ISE by reducing the ohmic resistance [21,22]. Hence, the effect of lipophilic salt on the response of ASESE was investigated by varying the KTpClPB content from 0.6 to 5.0 wt%, where the contents of ionophore and TPU were kept constant.…”