Claims
- 1. A method of coating an electrode for use in a hydrogen sulfide sensor comprising the steps of
- dissolving a compound of formula ##STR8## wherein n is from zero to three, in a solvent to form a tungsten carboxylate precursor solution;
- depositing said precursor solution on an electrode using a solution casting technique to form a film coating over said electrode; and
- heating said coated electrode so that said coating decomposes to tungsten oxide.
- 2. A method of coating an electrode for use in a hydrogen sulfide sensor comprising the steps of
- dissolving a tungsten salt in an aprotic solvent to form a tungsten carboxylate precursor solution, said tungsten salt prepared by the process consisting essentially of combining tungsten (VI) oxychloride with four equivalents of sodium 2-ethylhexanoate in the presence of a large excess of 2-ethylhexanoic acid in toluene and refluxing for 16 hours;
- depositing said precursor solution on an electrode using a solution casting technique to form a film coating over said electrode; and
- heating said coated electrode so that said coating decomposes to sodium tungstate.
- 3. A method of coating an electrode for use in a hydrogen sulfide sensor comprising the steps of
- dissolving tungsten bis(2-ethylhexanoate) in a solvent to form a tungsten carboxylate precursor solution;
- depositing said precursor solution on an electrode using a solution casting technique to form a film coating over said electrode; and
- heating said coated electrode so that said coating decomposes to tungsten oxide.
- 4. A method of coating an electrode for use in a hydrogen sulfide sensor comprising the steps of
- dissolving a compound of empirical formula
- ClO.sub.3 W.sub.3 (OOCR).sub.2
- wherein R is alkyl, alkenyl or aralkyl of 2 to 19 carbons in a solvent to form a tungsten carboxylate precursor solution;
- depositing said precursor solution on an electrode using a solution casting technique to form a film coating over said electrode; and
- heating said coated electrode so that said coating decomposes to tungsten oxide.
- 5. A method of coating an electrode for use in a hydrogen sulfide sensor comprising the steps of
- dissolving a tungsten compound in an aprotic solvent to form a tungsten carboxylate precursor solution, said tungsten compound prepared by the process consisting essentially of combining tungsten (VI) oxychloride with thirty equivalents of 2-ethylhexanoic acid and heating at 160.degree. C. for 24 hours;
- depositing said precursor solution on an electrode using a solution casting technique to form a film coating over said electrode; and
- heating said coated electrode so that said coating decomposes to tungsten oxide.
- 6. A method of coating an electrode for use in a hydrogen sulfide sensor according to claim 4 wherein R is 1-ethylpentyl.
- 7. A method of coating an electrode for use in a hydrogen sulfide sensor comprising the steps of
- dissolving a compound of formula
- Na[OW(OOCR).sub.2 ].sub.2
- wherein R is alkyl, alkenyl or aralkyl of 2 to 19 carbons in a solvent to form a tungsten carboxylate precursor solution;
- depositing said precursor solution on an electrode using a solution casting technique to form a film coating over said electrode; and
- heating said coated electrode so that said coating decomposes to sodium tungstate.
- 8. A method of coating an electrode for use in a hydrogen sulfide sensor according to claim 7 wherein R is alkyl or aralkyl of 6 to 10 carbons.
- 9. A method of coating an electrode for use in a hydrogen sulfide sensor according to claim 8 wherein R is a 1-ethylpentyl radical.
- 10. A method of coating an electrode for use in a hydrogen sulfide sensor according to claim 8 wherein R is 2 or 3-phenylpropyl.
Parent Case Info
This application is a division of application Ser. No. 07/934,920, filed Aug. 25, 1992 now U.S. Pat. No. 5,321,146 which is a CIP of Ser. No. 07/677,729 filed Mar. 29, 1991 now abandoned.
US Referenced Citations (7)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
934920 |
Aug 1992 |
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Parent |
677729 |
Mar 1991 |
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