Abstract
Application of conducting polymers with additional functional groups for a solid contact formation and photocurable membranes as sensitive elements of solid-state chemical sensors is discussed. Problems associated with application of UV-curable polymers for sensors are analyzed. A method of sensor fabrication using copolymerized conductive layer and sensitive membrane is presented and the proof of concept is confirmed by two examples of solid-contact electrodes for Ca ions and pH.
Highlights
The history of solid-state chemical sensors is a history of attempts to find materials and technological process that permit to obtain stable signal on miniaturized devices fabricated by mass production technologies
We may speak about a very large group of ion-selective electrodes (ISE) with inner solid contact and coated wire electrodes (CWE) and sensors based on field effect transducers, like ion- selective field effect transistors (ISFETs), light addressable potentiometric sensors (LAPS) and electrolyte-insulator-semiconductor (EIS) capacitances
Due to the water uptake, thin aqueous layers or pools of water can be formed at the membrane/electrode interface in potentiometric solid-contact ion sensors resulting in potential instability and poor membrane adhesion to the solid contact [3]
Summary
The history of solid-state chemical sensors is a history of attempts to find materials and technological process that permit to obtain stable signal on miniaturized devices fabricated by mass production technologies. At the same time conducting polymers with photopolymerizable groups applied by using of thin- and thick-films microfabrication technologies can result in cheap, mass-produced sensor arrays that can be integrated with control electronic in a straightforward way [11]. Another positive feature of these two classes of organic polymers is the opportunity to obtain an ISE membrane chemically attached to solid support and without leaching of its main components (ionophore, liphophilic additives, and plasticizer). In consideration of proposed idea the aim of this mini-review is to discuss some problems that may arise in the case of photocurable membranes application and present the proof of concept and some examples of solid-contact electrodes with copolymerized conductive layer and sensitive membrane
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