• K. C. Dubey
• Tanveer Hasan

Wide variety of metal oxide nanostructures such as iron oxide, tin-oxide, copper oxide, tungsten oxide, molybdenum oxide, zirconium-titanium mixed oxides, indium oxide and their applications such as gas-, bio- and chemical sensors, optical sensors, dye-sensitized solar cells etc. To control the humidity of air means the increasing or decreasing of moisture content of air during summer and winter respectively in order to produce comfortable & healthy efficiency of the worker. In general, for summer the summer relative humidity should not be less than 60% whereas for winter it should not be more than 40%. It may be noted that human being feels comfortable when air is at 210C and 56% relative humidity. The sensor device which is used to measure the relative humidity is known as humidity sensor. A humidity sensitivity meter is use for measuring the change in relative humidity of the chamber. A steel box is taken to use as a chamber & rubber is stripper at its mouth and then a glass cover is put over it to make it air resistive. Then the wires comes from resistivity meter is switched at the terminals of one glass slide. It may be noted that the film on the glass slide should be equal and of same thickness for all the films. The graph between humidity and resistivity of SnO2 which is made-up by spray, which gives many variations. When the humidity is increases then the resistivity is continuously increases and it gives slopes which show the sensitivity.it is linearly decreases. So from the graph this indicated the linear decrease in resistance with increasing humidity in 25-70% RH and thus proves the suitability of composite for humidity sensing purposes. The sensitivity was calculated with slope of curve and is found approximate at 30%RH. Further change in resistance at 90%RH with time is measure and curve which reveals the response time 10 sec. for 85%RH of material is very low and recovery time after blowing dry air is very high i.e. 13sec.

Humidity Sensor, Metal Oxide, Thin film, Spray Pyrolysis.

"GROWTH AND HUMIDITY SENSING PROPERTY OF METAL OXIDE THIN FILM BY SPRAY PYROLYSIS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 11, page no.d444-d451, November-2021, Available :http://www.jetir.org/papers/JETIR2111364.pdf

"GROWTH AND HUMIDITY SENSING PROPERTY OF METAL OXIDE THIN FILM BY SPRAY PYROLYSIS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 11, page no. ppd444-d451, November-2021, Available at : http://www.jetir.org/papers/JETIR2111364.pdf