Effect of heat treatment on the characteristics and NH3 Sensing properties of Tin Dioxide SnO2 Thin Film
الباحث الأول:
رضية مهدي الجراح
الباحثين الآخرين:
هدى علاوي حمزة
نور علي جعفر
المجلة:
Journal of Physics: Conference Series
تاريخ النشر:
None
مختصر البحث:
this research, Spray pyrolysis technique used to prepared Tin dioxide (SnO2) thin films on glass substrate with thickness about 200± 8 nm by dissolved 2.2563 g of SnCl2.2H2O in 100 ml of ethanol then added 60 drops from concentrated hydrochloric ac…
this research, Spray pyrolysis technique used to prepared Tin dioxide (SnO2) thin films on glass substrate with thickness about 200± 8 nm by dissolved 2.2563 g of SnCl2.2H2O in 100 ml of ethanol then added 60 drops from concentrated hydrochloric acid (HCl) .After that the films were annealed at different temperatures (300, 400 and 400 oC ). X-ray analyses shows that the structure of all SnO2 films is polycrystalline with tetragonal rutile crystalline structuree with preferentiall orientation in the direction (200).
The optical measurements show that the optical transitions has been direct and the average band gap has been tendency to decreases from 3.98 eV to 3.73 eV with increasing of Ta. The extent and nature of transmittance and optimized. band gap, of the material, assure to utilizee it for sensor applicationss.
From sensing measurements for NH3 gas at different operating temperature (100,200,250 and 300)oC and gas concentrationn (5%, 10%, 15%, 20%, 25%, 30%, and 35% ) can be seen that the sensitivityy increases with increasing, operatingg temperature, and gas concentration , the response time decreases to smallest value (4s) at operating temperature 200 oC while the recovery time (22 s) .
