Synthesis, Electrical And Sensing Studies on Polyaniline/V2o5 Nanocomposites

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Synthesis, Electrical And Sensing Studies on Polyaniline/V2o5 Nanocomposites

Dr.Jakeer Husain Assistant Professor Dept of Engg Physics

KBNU Gulbarga,karnataka

Dr.Narsappa Reddy Associate Professor ECM Department

JBIET Moinabad ,Hydrabad

Dr. Rehana Anjum Professor S&H HOD Chemistry Lords Institute of Engineering and

Technology ,Hydrabad

Jaisheel Sagar

Department of Mechanical Engineering, Farah Institute of Technology

Chevella, JNTUH, India

Bushara anjum

Nagambika College of education for woman Bijapur university ,karnataka India

Abstract Polyaniline and its nanocomposites were synthesized by chemical oxidative polymerization technique using monomer aniline and ammonium persulphate as an oxidant. The prepared Polyaniline and composite were characterized by Scanning electron microscopy (SEM), And also we study on the performance of a room temperature LPG gas sensor based on Polyaniline- V2O5 nanocomposites and there electrical properties.

Keywords- SEM;PAN;,Composite;Polymerization;,LPG.

  1. INTRODUCTION

    Polyaniline is the most widely studied due to its several properties [1,2]. It ease to synthesis , low density, less cost, better electronic, optical properties, highly stable in air and soluble in various solvents, and good processibility [1].Thus the synthesis of novel conducting polymers and study of their physical properties has been of prime importance. Aqueous electrochemical process in an environmentally friendly and efficient technique used to process conducting polymer. It is widely preferred because of its simplicity and it can be used as a one step method to form polymer. It allows efficient control of the physiochemical properties of the coatings and

    it can also be easily scaled up for large scale production [2-4]. Conductive polymers had been the topic of the large number of investigations during last decades because of their unique properties such as mechanical strength, electrical conductivity, corrosion, stability and possibility of both oxidative and electrochemical synthesis. Hence PANI is useful in wide area of application[5-6]

    In the present investigations attempts were made to report on synthesis of PANI composite by chemical oxidative method the synthesized compound is characterized by Scanning electron microscopy (SEM).

  2. EXPERIMENTAL

    Synthesis of Polyaniline/ V2O5 nanocomposites

    Synthesis of the PANI/ V2O5 nanocomposites was carried out by in-situ polymerization method. Aniline (0.1 M) was mixed in 1 M HCl and stirred for 15 min to form aniline hydrochloride. V2O5 nanoparticles were added in the mass

    fraction to the above solution with vigorous stirring in order to keep the V2O5 homogeneously suspended in the solution. To this solution, 0.1 M of ammonium persulphate, which acts as an oxidizer was slowly added drop-wise with continuous stirring at 5C for 4 h to completely polymerize. The precipitate was ltered, washed with deionized water, Acetone, and nally dried in an oven for 24 h to achieve a constant mass. In these way, PANI V2O5 nanocomposites containing various weight percentages of V2O5 (10 %, 20 %, 30 %, 40 %, and 50 %) in PANI were synthesized.

  3. RESULTS AND DISCUSSION

    1. Scanning Electron Microscopy

      Figure 3.1 (a)&(b) shows the Scanning Electronic Micrograph image of pure PANI and Polyaniline V2O5 nanocomposites. figure shows the pure V2O5 paricle shows uniform sphere-like shape.

      1. Polyaniline

      2. PANI/Composite

        Figure 3.1 (a)&(b) shows the Scanning Electronic Micrograph image of pure PANI and Polyaniline V2O5 nanocomposites.

  1. SENSING STUDIES

    Figure 4 shows the variation of Sensitivity with time for PANI/V2O5 nanocomposite containing:10wt%, 20wt%, 30wt%, 40 wt % 50wt% V2O5 particles.The Sensitivty of the nanocomposite was measured at room temperature when expose to LPG vapors the Sensitivty of all pani nanocomposite samples increses with increasing the weight

    an increase in temperatures due to the flow of ions from one localized state to another and It is also suggested here that the thermal curling effects of the chain alignment of the Polyaniline leads to the increase in conjugation length and that brings about the increase of conductivity.

    2.2×10-5

    percentage of V2O5 nanoparticle increase in sensitivity can be the increase in V2O5 adsorption capacity of the contact zone between the charged particles of pani and V2O5 nanoparticles.the increasing sensitivity at higher weight percentage may be due to high surface area with possible reaction sites of the nanocomposites due to adsorption of gas molecules .

    3.5×103

    pani 10wt% 20wt% 30wt%

    pani 10wt% 20wt% 30wt%

    3.0×103

    2.5×103

    2.0×10-5

    1.8×10-5

    1.6×10-5

    (S/cm)

    (S/cm)

    1.4×10-5

    1.2×10-5

    dc

    dc

    1.0×10-5

    8.0×10-6

    6.0×10-6

    4.0×10-6

    2.0×10-6

    pani 10wt% 20wt% 30wt% 40wt% 50wt%

    40 60 80 100 120 140 160

    Temprature (oC)

    40wt%

    50wt%

    40wt%

    50wt%

    Sensitivity

    Sensitivity

    2.0×103

    Figure 5 shows the dc conductivity of Pani, Pani/V2O5 nanocomposites

    1.5×103

    1.0×103

    5.0×102

    0.0

    0 200 400 600

    Time in se conds

    CONCLUSIONS

    In this study PANI/V2O5 nanocomposites were successfully synthesized by in-situ polymerization method in the presence of V2O5 nanoparticles.The results of SEM show the formation of the nanocomposite and indicate an interaction between PANI and V2O5nanoparticles. The maximum Sensitivity and conductivity is observed for 50wt% of V2O5 nanocomposite.

    Figure 4 shows the variation of Sensitivity with time for PANI/V2O5 nanocomposite

  2. DC CONDUCTIVITY

Figure 5 shows the dc conductivity of Pani, Pani/V2O5 nanocomposites as a function of temperature which varies from 40 to1600c. The conductivity values are almost constant up to 80oc and after it increases steadily up to 160oc, which shows the semiconducting material behavior. At higher temperature, conductivity increases because of hoping of charge carriers (polarans) from one localized state to another localized state. The increase in dc conductivity as a function of temperature of the PANI/ V2O5 nanocomposites at different weight percentages. The conductivity increases with

REFERENCES

[1]. A.Gadisa,Tvingstedt,S.Admassie,L.Lindeel,X.Cripsin,M.R.Anderson, W.R.Salanech,O.

[2]. Inganas, Synth .met, 2006,156, 1102.

[3]. K.Yoshino, Synth. Met, 1989, 28, C669.

[4]. K.Yoshino, M.Ozaki and R.Sugimoto, Jpn.J.Appl.Phys.Lett. ,1985, 24,

373.

[5]. J.C.Chiang and A.G.Mac Diarmid, Synth. Met, 1986,13, [6]. Dr.Jakeer Husain et almaterials today proceedings.2016. [7]. ]JakeerHusain etal 2020 J.Phys.:Conf.Ser.1495012008

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