Synthesis and Characterization of Ag/PVP Nanocomposites by Reduction Method

P. M. Geethu Krishnan, A. Sobha^*, Mini P. Balakrishnan, R. Sumangala

Department of Physics, Providence Women’s College, Calicut, Kerala, India.

DOI: 10.4236/oalib.1100519                

Abstract

A polyvinylpyrrolidone (PVP)/Ag nanocomposite was prepared by reduction of silver nitrate in ethylene-glycol in the presence of a polymeric protective agent (i.e., poly (N-vinylpyrrolidone)). The size dependent color variation of this nanocolloid is a clear indication of the presence of Ag as nanoparticles in the polymer matrix. The nonlinear optical properties were studied by Z-scan technique in which a Q-switched Nd: YAG laser with a pulse width of 7 ns at 532 nm was used as the source of light. Z scan measurement shows that Ag/PVP exhibits third order Nonlinear Optical effects. The peak-valley curve from closed aperture measurement indicates the self-defocusing process. The third order nonlinear optical parameters n², β, χ³ are found to be of the orders of 10^-9 esu, 10^-9 m/W, 10^-11 esu respectively. The very strong Plasmon resonance peak at 419 nm was observed and is a clear consequence of the nanosize of dilute Ag particles. The optical band gap of this nanomaterial was calculated as 2.535 eV. The XRD pattern indicates the presence of crystalline Ag and the average grain size was obtained as 17.4 nm. The SEM micrograph confirms this observation. Thermal Gravimetric Analysis implies that Ag/PVP nanocomposite exhibits high degree of thermal stability.

Keywords

Ag/PVP Nanocomposites, XRD, Optical Band Gap, Z-Scan

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Rishi Pal, C., Suman, M., Tomar, A.K. and Shyam, K. (2011) Effect of Ultraviolet Irradiation on the Optical and Structural Characteristics of In-Situ Prepared PVP-Ag Nanocomposites. Digest Journal of Nanomaterials and Biostructures, 6.
[2]	Zhang, Z., Zhang, L., Wang, S., Chen, W. and Lei, Y. (2002) A Convenient Route to Polyacrylonitrile/Silver Nanoparticle Composite by Simultaneous Polymerization-Reduction Approach. Polymer, 42, 8315-8318. http://dx.doi.org/10.1016/S0032-3861(01)00285-3
[3]	Wada, Y., Kobayashi, T., Yamasaki, H., Sakata, T., Hasegawa, N., Mori, H. and Tsukahara, Y. (2007) Nanohybrid Polymer Prepared by Successive Polymerization of Methacrylate Monomer Containing Silver Nanoparticles in Situ Prepared under Microwave Irradiation. Polymer, 48, 1441-1444. http://dx.doi.org/10.1016/j.polymer.2007.01.047
[4]	Huang, L.M. and Wen, T.C. (2007) One-Step Synthesis of Silver Nanoparticles and Poly(2,5-dimethoxyaniline) in Poly(Styrene Sulfonic Acid). Materials Science and Engineering: A, 445-446, 7-13. http://dx.doi.org/10.1016/j.msea.2006.05.121
[5]	Ghosh, K. and Maiti, S.N.J. (1996) Mechanical Properties of Silver-Powder-Filled Polypropylene Composites. Applied Polymer Science, 60, 323-331. http://dx.doi.org/10.1002/(SICI)1097-4628(19960418)60:3<323::AID-APP5>3.0.CO;2-N
[6]	Hatchett, D.W., Josowicz, M., Janata, J. and Baer, D.R. (1999) Electrochemical Formation of Au Clusters in Polyaniline. Chemistry of Materials, 11, 2989-2994. http://dx.doi.org/10.1021/cm990365m
[7]	Huang, C.J., Yen, C.C. and Chang, T.C.J. (1991) Studies on the Preparation and Properties of Conductive Polymers. III. Metallized Polymer Films by Retroplating out. Applied Polymer Science, 42, 2237-2245. http://dx.doi.org/10.1002/app.1991.070420814
[8]	Gotoh, Y., Igarashi, R., Ohkoshi, Y., Nagura, M., Akamatsu, K. and Deki. S. (2000) Preparation and Structure of Copper Nanoparticle/Poly(Acrylicacid) Composite Films. Journal of Materials Chemistry, 11, 2548-2552. http://dx.doi.org/10.1039/b003899g
[9]	Carotenuto, G., Pepe, G.P. and Nicolais, L. (2000) Preparation and Characterization of Nano-Sized Ag/PVP Composites for Optical Applications. Europen Physical Journal B, 16.
[10]	Garcia, M.A., de la Venta, J., Crespo, P., Lopis, J.L., Penadés, S., Fernández, A. and Hernando, A. (2005) Surface Plasmon Resonance of Capped Au Nanoparticles. Physical Review B, 72, 241403(R).
[11]	Susie, E. and El-Sayed, M.A. (2005) Why Gold Nanoparticles Are More Precious than Pretty Gold: Noble Metal Surface Plasmon Resonance and Its Enhancement of the Radiative and Nonradiative Properties of Nanocrystals of Different shapes.
[12]	Jean-Michel, M., Markus, B., Iliya, S. and van Driel, H.M. (2007) Single-Beam Differential Z-Scan Technique. Applied Optics, 46.
[13]	Mansoor, S.-B., Ali, A.S., Wei, T.-H., Hagan, D.J. and Van Stryland, E.W. (1990) Sensitive Measurement of Optical Nonlinearities Using a Single Beam. IEEE Journal of Quantum Electronics, 26.
[14]	Mansoor, S.-B. and Van Stryland, E.W. (1998) Z-Scan Measurements of Optical Nonlinearities. In: Kuzyk, M.G. and Dirk, C.W., Eds., Characterization Techniques and Tabulations for Organic Nonlinear Materials, Marcel Dekker, Inc., 655-692.
[15]	Wang, J.M., Sheik-Bahae, A., Said, A., Hagan, D.J. and Van Stryland, E.W. (1994) Time-Resolved Z-Scan Measurements of Optical Nonlinearities. Journal of the Optical Society of America B, 11.
[16]	Esmaeil Shahriari, W., Mahmood, M.Y., Kazem, N. and Elias, S. (2010) The Optical Nonlinearity of Au and Ag Nanoparticle Prepared by the γ-Radiation Method. American Journal of Engineering and Applied Sciences, 3, 260-264. http://dx.doi.org/10.3844/ajeassp.2010.260.264
[17]	Rawat, A., Mahavar, H.K., Chauhan, S., Tanwar, A. and Singh, P.J. (2012) Optical Bandgap of Polyvinylpyrrolidone/ Polyacrilamide Blend Thinfilm. Indian Journal of Pure and Applied Physics, 50.
[18]	Monti, O.L.A., Fourkas, J.T. and Nesbitt, D.J. (2004) Diffraction-Limited Photogeneration and Characterization of Silver Nanoparticles. Journal of Physical Chemistry B, 108, 1604-1612. http://dx.doi.org/10.1021/jp030492c
[19]	Hyun-Ki, H., Chan-Kyo, P. and Myoung-Seon, G. (2010) Preparation of Ag/PVP Nanocomposites as a Solid Precursor for Silver Nanocolloids Solution. Bulletin of the Korean Chemical Society, 31, 1252-1256. http://dx.doi.org/10.5012/bkcs.2010.31.5.1252
[20]	Kothapalle, S., Koramala, N.K., Naresh, V. and Srinivasa, B. (2011) Structural and Optical Properties of Li+: PVP & Ag+: PVP Polymer Films. Materials Sciences and Applications, 2, 1688-1696. http://dx.doi.org/10.4236/msa.2011.211225
[21]	Zheng, M.P., Gu, M.Y., Jin, Y.P. and Jin, G.L. (2001) Optical Properties of Silver-Dispersed PVP Thin Film. Material Research Bulletin, 36, 2001.
[22]	Bogle, K.A., Dhole, S.D. and Bhoraskar, V.N. (2006) Nanotechnology, 17, 3204.
[23]	Khanna, P.K., Narendra, S., Shobhit, C. and Viswanath, A.K. (2005) Synthesis of Ag/polyaniline Nanocomposite via an in Situ Photo-Redox Mechanism. Materials Chemistry and Physics, 92, 214-219. http://dx.doi.org/10.1016/j.matchemphys.2005.01.011
[24]	Shawkat, S.G., Shahidan, R., Lee, Y.H., Elias Saion, G.H. and Mohamed, S. (2010) Synthesis and Characterization of Silver/Polyvinilpirrolidone (Ag/PVP) Nanoparticles Using Gamma Irradiation Techniques. American Journal of Applied Sciences, 7, 2010.
[25]	Mbhele, Z.H., Salemane, M.G., van Sittert, C.G.C.E., Nedeljkovic, J.M., Djokovic, V. and Luyt, A.S. (2003) Journal of Chemical Materials, 15, 5019.