Tungstic Oxide Nano-wire and Method for Preparing Tungstic Oxide Nano-wire Ammonia Sensitive Sensor

The invention relates to a tungsten oxide nano-wire ammonia-sensitive sensor and a preparation method thereof, belonging to the gas sensor technical field. The method comprises the following steps that: sodium tungstate is dissolved in deionized water to prepare a sodium tungstate solution; a hydrochloric acid and an oxalic acid are dripped slowly and stirred; a flaxen micellar solution is transferred into a reaction kettle, added with 25 to 30 grams of potassium sulfate and uniformly stirred, and the mixture undergoes hydrothermal treatment for 12 to 144 hours at a temperature of 180 DEG C; hydrothermal products are washed and fully dried in the presence of air with a temperature of 65 DEG C, and then a tungsten oxide nano-wire is prepared; adhesives and frit are added according to the tungsten oxide nano-wire prepared to prepare gas-sensitive materials slurry; and then the tungsten oxide nano-wire ammonia-sensitive sensor is prepared after element sintering and ageing. The method has simple steps, easily controlled parameters, and low energy consumption during the whole preparation process; the tungsten oxide nano-wire prepared has a large specific surface area; and the tungsten oxide nano-wire ammonia-sensitive sensor prepared has high sensitivity on low-concentration ammonia (between 1 and 100 pars per million), good repeatability and high stability.

A tungsten oxide nanowires, characterized in that the preparation steps are as follows: (1) 1.0 to 1.5 g of sodium tungstate was dissolved in 24 to 30 ml of deionized water and a magnetic stirring in an ice water bath 1 hours a colorless transparent solution of sodium tungsten; (2) in the step (1) in the resulting sodium tungstate solution was slowly added dropwise 3.5 to 4 ml 3M / L hydrochloric acid and continuously stirred for 0.5 hours and then slowly added dropwise 4.6 ~ 5.2 ml 0.3M / L oxalic acid and stirring was continued for 0.5 hours to form a pale yellow micellar solution; (3) 28 to 30 ml in step (2) of the micellar solution into 50ml reactor and adding 25 to 30 grams Stir potassium, and water at a temperature of 180 ℃ heat treatment of 12 to 144 hours; (4) in the step (3) of the hot products of water in deionized water and ethanol after repeated washing, the air atmosphere at 65 ℃ under fully drying, to prepare the tungsten oxide nanowires.

A tungsten oxide nanowires preparation of ammonia sensitive sensor, characterized in that the preparation steps are as follows: (l) the preparation of the slurry to the gas-sensitive material of the tungsten oxide nanowires adding a binder and a glass frit, stir to prepare a slurry sensitive material; wherein the binder is ethyl cellulose and terpineol; (2) element sintering step (l) of said sensitive material by screen printing paste with silver electrodes and leads alumina substrate, 70 ° C in air sufficiently dried in a box furnace at 300 to 500. The sintering temperature of C 1 to 2 hours to obtain a tungsten oxide nanowires ammonia sensitive sensor element; (3) aging of components in the step (2) was obtained in the ammonia tungsten oxide nanowires sensitive sensor element 300 ° C aging for 72 hours obtained tungsten oxide nanowires ammonia sensitive sensor.




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