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Solvent-processible polymer membrane-based liquid junction-free reference electrode
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DOI：10.1021/ac980265k.png)
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摘要
En 中文
A new type of liquid junction;free reference electrode system is devised by employing solvent-processible polymer membranes. The membranes are formulated with either a one-component silicone rubber or an aromatic-type polyurethane as the matrixes. The optimized formulations incorporate both cation- and anion-exchange sites (i.e,, potassium tetrakis(p-chlorophenyl)borate and tridodecylmethylammonium chloride) and; in the case of silicone rubber, a plasticizer. The silicone rubber-based membrane, while possessing minimal response toward most ions, is found to display a near-Nernstian response to pH change. The aromatic polyurethane matrix formulation, however; is not sensitive to pH over a wide range (i.e,, pH 2-12) and is shown to exhibit only a small emf variation (within +/-2 mV) toward a wide variety of salts added even at very high concentrations (i,e,, up to 0.1 M). Potentiometric emf responses of ISEs (e.g,, Na+, K+, Ca2+, Cl-), whether paired with a polymer membrane-based reference electrode or with a conventional liquid junction-type reference electrode, are shown to be remarkably similar within the precision of the measurement setup. The feasibility of adapting the proposed reference electrode to the planar solid-state sensor format is also demonstrated.
Keyword:
STATE REFERENCE ELECTRODE
FIELD-EFFECT TRANSISTORS
ION-SELECTIVE ELECTRODE
ELECTROCHEMICAL PERFORMANCE
POTENTIOMETRIC PROPERTIES
SENSORS
POLYURETHANE
GATE
MATRICES
ISFETS
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期刊
IF:
6.7
论文数:
4.7W
被引数:
15.9W
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