Ion sensor
First Claim
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1. An ion sensor comprising:
- an electrically conductive substrate;
an electrically polymerized redox layer having a redox function covering a surface of said electrically conductive substrate; and
an ion-selective layer exhibiting ion selectivity covering a surface of said redox layer wherein said ion selective layer contains the following ingredients (a) - (d);
space="preserve" listing-type="tabular">______________________________________ (a) a polyvinyl chloride 100 parts by weight (b) ion carrier material 6-30 parts by weight (c) electrolytic salt 0-3.6 parts by weight (d) plasticizers 40-665 parts by weight. ______________________________________
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Abstract
Disclosed is a solid-type ion sensor which does not have an internal liquid chamber. The ion sensor has a laminated structure basically includes an electrically conductive substrate, a redox layer having a redox function covering the surface of the electrically conductive substrate, and an ion-selective layer covering the surface of the redox layer. Also provided is an ion sensor of this type having an insulated thermister imbedded so as to contact the redox layer.
36 Citations
47 Claims
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1. An ion sensor comprising:
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an electrically conductive substrate; an electrically polymerized redox layer having a redox function covering a surface of said electrically conductive substrate; and an ion-selective layer exhibiting ion selectivity covering a surface of said redox layer wherein said ion selective layer contains the following ingredients (a) - (d);
space="preserve" listing-type="tabular">______________________________________ (a) a polyvinyl chloride 100 parts by weight (b) ion carrier material 6-30 parts by weight (c) electrolytic salt 0-3.6 parts by weight (d) plasticizers 40-665 parts by weight. ______________________________________ - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An ion sensor comprising:
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an electrically conductive substrate having a tip; a redox layer having a redox function covering a surface of said electrically conductive substrate; and a thermister coated with an insulating membrane and imbedded adjacent the tip of said electrically conductive substrate so as to contact said redox layer; and an ion-selective layer covering a surface of said redox layer and of said insulating membrane which covers said thermister. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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35. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is a compound expressed by the formula ##STR19## where R4 represents an alkyl group having a carbon number of 8-18, and is selective to hydrogen ion.
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36. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group consisting of crown ether compounds including valinomycin, nonactin and monactin, and is selective to potassium ion.
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37. An ion sensor according to claim 36 wherein said crown ether compounds comprise dicyclohexyl-18-crown-6,naphtho-15-crown-5,bis (15-crown-5).
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38. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group consisting of aromatic amides or diamides, aliphatic amides or diamides, and crown compounds, and is selective to sodium ion.
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39. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group of the quaternary ammonium salts expressed by the formula ##STR20## where R7, R8, R9 represent the same or different alkyl groups which have a carbon number of 8-10, and R10 represents hydrogen or an alkyl group having a carbon number of 1-8, and is selective to chlorine ion.
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40. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is expressed by the formula ##STR21## and is selective to chlorine ion.
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41. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group consisting of calcium bis(di-(n-octylphenyl) phosphate), (-)-(R,R)-N,N'"'"'-bis(11-ethoxy carbonyl) undecyl)-N,N'"'"',4,5-tetramethyl-3,6-dioxaoctane-diamide and calcium bis(di(n-decyl) phosphate), and is selective to calcium ion.
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42. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group of quaternary ammonium salts expressed by the formula ##STR22## where R11, R12, R13 represent the same or different alkyl groups having a carbon number of 8-18, R14 represents hydrogen atom or an alkyl group having a carbon number of 1-4 , and X- represents Cl-, Br- or OH-, and is selective to hydrogencarbonate ion.
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43. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group of tertiary amine compounds expressed by the formulae ##STR23## and is selective to hydrogencarbonate ion.
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44. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is selected from the group of nonactins consisting of monactin and tetranactine, and is selective to ammonium ion.
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45. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material selective to magnesium ion.
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46. The ion sensor according to claim 24, wherein said ion-sensitive layer comprises a polymeric membrane containing an ion carrier material, which is a tertiary amine compound selective to hydrogencarbonate ion.
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47. An ion sensor comprising:
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an electrically conductive substrate; a redox layer electrolytically polymerized at about -20°
C. having a redox function covering a surface of said electrically conductive substrate; andan ion-selective layer exhibiting ion selectivity covering a surface of said redox layer.
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Specification