Zinc Oxide Lab Report

2006 Words9 Pages
Mechanism of DC Conductivity measurement of Zinc Oxide doped Polyaniline Nanocomposites Sharanabasamma M Ambalagi*, Hajeebaba K Inamdar and Basavaraja Sannakki* Department of Post graduate and Research in Physics Gulbarga University Kalaburagi.585106 Karnataka, India. *Author of Correspondence Email id: shakti6585@gmail.com sannakki.phy@gmail.com, Abstract: In the present study, Zinc oxide nanoparticles were prepared by sol-gel method. Polyaniline/Zinc oxide (PANI-ZnO) nanocomposites were synthesized by the process of in- situ polymerization by using various weight percentage of nanoparticles of Zinc oxide say 10%, 20%, 30%, 40% and 50%. The samples of nanocomposites were characterized by powder…show more content…
Further, the spongy gel was slowly heated at T = 1500 C for 1 hour in a hot air oven and obtained the compound. The compound was grinded well and calcinated for 2 hour to remove impurities. Finally, pure zinc oxide nanoparticles were obtained. 2.1 Synthesis of Polyaniline/ZnO Nanocomposites Synthesis of the PANI/Zinc Oxide nanocomposites was carried out by in-situ polymerization method. Aniline (0.1 M) was mixed in 1 M HCl and stirred for 15 minute to form aniline hydrochloride. The nanoparticles of Zinc oxide at 10 wt% were added in the above solution with vigorous stirring in order to get the homogeneously suspended Zinc oxide nanoparticles in the solution. Further slowly added 0.1 M of ammonium persulphate drop-wise which acts as an oxidizer with continuous stirring to this solution. The temperature was maintained at 4oC by keeping in the ice for 4 hours for polymerizing completely. Then the precipitate was filtered, washed with deionized water, acetone and finally dried in an hot air oven for 24 hours. Similarly PANI/ZnO Nanocomposites at different weigh percentages, that is…show more content…
dc (S /c m ) Temprature (oC) pani 10wt% 20wt% 30wt% 40wt% 50wt% Fig 4.3: Shows Electrical Conductivity of Pure PANI and PANI-ZnO Nanocomposites. The inter chain and inter chain hopping depends on conjugation length. It is observed in many conducting polymer systems that as the chain length increases, conductivity increases and the temperature dependence of conductivity becomes weaker. The conductivity varies directly with the temperature, obeying an expression of the following form 1/4 ( ) exp oo TT T ? ? ? ?? ? ? ?? ?? ? ? ?? ?? ? Where: ? is the conductivity, T is the temperature and ?0 is the conductivity at characteristic temperature T0. The Mott Theory type temperature dependence can also result from the effect of finite conjugation length on the frequency of nearest neighbor inter chain hopping. The nearest neighbor hopping process with a distribution of activation energies can give same type of exponential temperature dependence for conductivity. It is observed that the conductivity values increase up to 50 wt % of ZnO in Polyaniline. This is attributed due to extended chain length of Polyaniline which facilitate the hopping of charge carriers when

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