Granted Patent B2

US 10,161,897 · App. 14/593,111 · Granted Dec 25, 2018

Inventor: Yiliang Wu (Oakville, CA)

Assignee: XEROX CORPORATION

G01N27/302

Abstract

Claims (19)

1. A pH sensor comprising:

(a) a sensing electrode;

(b) a counter electrode;

(c) an electrolyte layer located between the sensing electrode and the counter electrode; and

(d) a metal oxide layer located between the sensing electrode and the electrolyte layer, the metal oxide layer being made of TiO 2 , ZnO, WO 3 , SnO 2 , RuO 2 , Ta 2 O 5 , or IrO 2 ;

wherein the sensing electrode consists of palladium formed by thermal decomposition of a palladium precursor composition.

2. The pH sensor of claim 1 , wherein the electrolyte layer is in physical contact with the sensing electrode and the counter electrode.

3. The pH sensor of claim 1 , wherein the counter electrode comprises silver and silver chloride.

4. The pH sensor of claim 1 , wherein the sensor has a sensitivity of at least 40 mV/pH.

5. The pH sensor of claim 1 , wherein the sensor has a response time of no longer than 200 seconds.

6. The pH sensor of claim 1 , wherein the sensor has a linearity of at least 95% in the pH range from 2 to 12.

7. The pH sensor of claim 1 , wherein the sensor further comprises an insulator located adjacent to the electrolyte layer and between the sensing electrode and the counter electrode.

8. A biomedical device comprising a pH sensor comprising:

(a) a sensing electrode;

(b) a counter electrode;

(c) an electrolyte layer located between the sensing electrode and the counter electrode; and

(d) a metal oxide layer located between the sensing electrode and the electrolyte layer, the metal oxide layer being made of TiO 2 , ZnO, WO 3 , SnO 2 , RuO 2 , Ta 2 O 5 , or IrO 2 ;

wherein the sensing electrode comprises palladium and palladium oxide.

9. The biomedical device of claim 8 , wherein the sensing electrode comprises more than 50 at % PdO.

Assignments (10)

Continuity (1)