www.ijcrt.org © 2020 IJCRT | Volume 8, Issue 12 December 2020 | ISSN: 2320-2882 IJCRT2012004 International Journal of Creative Research Thoughts (IJCRT) www.ijcrt.org 19 Investigating the Sensing Response of Polyaniline for Ammonia Prepared at Lower Room Temperature Abhay G. Shrivas, 1 N. S. Patil and 2 L. S. Patil 1 Department of Physics Bhusaval Arts Sci and P.O.Nahata Commerce College Bhuisaval-425201 2 Department of Electronics, Dr. Anna Saheb G.D. Bendale Mahila Mahavidyalaya, Jalgaon -425001 Abstract : The useful ammonia (NH3) gas sensor based on polyaniline (PANI) film as an active sensing layer. The PANI films prepared on a Glass substrate by a simple in-situ polymerization technique. In FTIR spectroscopy N-H and C- H stretching observed at the 3400 /cm which confirms the functional group of PANI. In UV–Visible absorption spectrum of the synthesized PANI film extended tail at 800nm representing the conducting ES state of Polyaniline. Ammonia (NH3) gas-sensing properties of the films prepared at 0 o C conditions were examined at room temperature in the range of 10 to 100ppm.The room temperature functioning of the sensor is critical, which facilitates low-power operation and also enhances the life time of a sensor. The observed variation in resistance of PANI film corresponding to 10 ppm and 100 ppm of NH3 exposure. Furthermore, good reproducibility and long-term stability were also observed over a concentration range from 10 to 100 ppm. These results indicate that the PANI films on glass substrate promising for portable on-site detection. I. Introduction The most commonly studied classes of conducting polymer is polyacetylene, polythiophene, polypyrrole, polyaniline and derivates, being investigated as conducting matrices for electronics applications such as Functional electrodes, Electrochromic devices, Optical switching devices, Batteries, TFTS, OLED, Sensors and so on. [1-3] Among all these conducting polymer, polyaniline is one of the most studied material because of its high conductivity upon doping with acids, its well-behaved electrochemistry, and easy preparation under reproducible conditions by electro chemical polymerization and chemically oxidation of aniline, chemical and electrical stability and good environmental stability. [4–15]. In recent times, we have witnessed for development of ammonia gas sensor for detection of toxic gases with a fast response time. Anhy-drous ammonia (NH3) is one such toxic gas, which is colourless and water-soluble with an execrable odour. Hence, due to the deleterious effects of NH 3 to human health and the environment monitoring of the NH3 level has become extremely important. [16] [17] The polymerization temperature is an important characteristic in the synthesis and it plays the important role in sensing of gases. To the best of our knowledge, the sensor explained by waghule et. Al shows response above 100ppm [18]. and the synthesis of PANI at 5 o C are not been yet studied for detection of NH 3 gas. Following this idea, in the present work, PANI sensor was developed and operated at room temperature where it shows good response and excellent recovery time 100 ppm of NH 3 gas. In addition, the sensors demonstrated a linear response in the range of 20-100 ppm as well as satisfying the conditions of stability and reproducability too. we also show the Fourier transform infrared spectroscopy (FTIR), and U-Visible spectroscopy for confirmation of PANI. II Experimental Setup, Materials and Equipment: All the chemicals and solvents used were dried and purified by standard methods. Analytical grade Aniline Hydrochloride, Ammonium Peroxi- disulphate (APS) and Hydrochloric acid (HCL), Acetone, DMF and for filtration of precipitate, what man’s filter paper ware used. The Polyaniline films produced were characterized by FTIR spectroscopy (Nicolet-380),UV-spectrophotometer (SHIMADZU-1601),ad Conductivity measurement is done by the two-probe technique. A. Synthesis of conducting polymer: In present paper the conducting polymer is synthesized by chemical method by oxidizing the corresponding monomer. The thin film of PANI has been prepared successfully by chemical oxidatiative polymerization and CBD technique. The physical properties of the film are characterized by the FTIR spectroscopy; the FTIR spectroscopy gives details of stretching bond in the prepared polymer film. The UV-vis spectrum is useful for gauging and providing information about the extent of conjugation, the electronic spectrum is indicative of polymer morphology, the presence of a free carrier tail. The change in conductivity due to temperature variations were observed with two probe method at room temperature. To oxidize 0.2M Aniline hydrochloride with 0.25M Ammonium peroxidisulphate aqueous medium Aniline Hydrochloride was dissolved in deionised water in volumetric flask to 50 ml. of solution. Ammonium peroxidisulphate was dissolved in deionised water in volumetric flask to 50 ml. of solution. Both solutions are kept below room temperature for 1 hour, then mixed in beaker, and left to polymerize. The polymerization was carried out in a temperature-controlled water bath for 24 hours at 5 0 C. After 24 hrs. Polyaniline precipitate was formed and collected on What man’s filter paper, washed with thrice 100 ml portion of 0.2M HCL and thereafter with