Górski Lukasz, Matusevich Alexey, Pietrzak Mariusz, Wang Lin, Meyerhoff Mark E, Malinowska Elżbieta
Warsaw University of Technology, Faculty of Chemistry, Department of Analytical, Chemistry, 00-664 Warsaw, POLAND.
J Solid State Electrochem. 2009 Jan 1;13(1):157-164. doi: 10.1007/s10008-008-0613-4.
The performance of solid-contact/coated wire type electrodes with plasticized PVC membranes containing metalloporphyrins as anion selective ionophores is reported. The membranes are deposited on transducers based on graphite pastes and graphite rods. The hydrophobicity of the underlying conductive transducer surface is found to be a key factor that influences the formation of an aqueous layer beneath the polymer film. Elimination of this ill-defined water layer greatly improves the electrochemical properties of the ion-sensors, such as EMF stability and life-time. Only highly lipophilic electrode substrates, namely graphite paste with mineral oil, were shown to prevent the formation of aqueous layer underneath the ion-sensing membrane. The possibility of employing Co(III)-tetraphenylporphyrin both as NO(2) (-) selective ionophore and as electron/ion conducting species to ensure ion-to-electron translation was also discussed based on the results of preliminary experiments.
报道了以含金属卟啉作为阴离子选择性离子载体的增塑PVC膜的固体接触/涂层丝型电极的性能。这些膜沉积在基于石墨糊和石墨棒的换能器上。发现底层导电换能器表面的疏水性是影响聚合物膜下形成水层的关键因素。消除这个不明确的水层可极大地改善离子传感器的电化学性能，如电动势稳定性和寿命。只有高度亲脂性的电极基底，即含矿物油的石墨糊，被证明能防止离子传感膜下形成水层。基于初步实验结果，还讨论了将Co(III)-四苯基卟啉既用作NO(2)(-)选择性离子载体又用作电子/离子传导物种以确保离子到电子转换的可能性。
