Photonic crystals in biology - NanoTR-VI

Poster Session, Thursday, June 17Theme F686 - N1123Synthesis and Characterization of Polyimide-silver Nanocomposite Containing Chalcone Moieties inThe Main Chain by UV-radiationKhalil Faghihi 1 *, Meisam Shabanian 11 Organic Polymer Research Laboratory, Department of Chemistry, Faculty of Science, Arak University, Arak, 38156, Iran,Abstract-The soluble polyimide (PI)-silver nanocomposite (PISN) 6a containing chalcone moieties as a photosensitive group was synthesizedsuccessfully by a convenient ultraviolet irradiation technique. A precursor such as AgNO 3 was used as the source of the silver particles.Polyimide 6 as a source of polymer was synthesized by the one-step synthesis of polyimide from polycondensation reaction of 4,4'-diaminochalcone 4 with pyromellitic anhydride 5 in the presence of iso-quinoline solution. The resulting composite film was characterized by FTIRspectoscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA) and diffrantial scanning calorimetry(DSC).There is intense interest in the synthesis and properties ofmetal clusters and nanoparticles prepared in both aqueous andorganic solutions and prepared in condensed state, forinstance, polymers, zeolites and glasses. Clusters,nanoparticles and its containing materials are potentiallyuseful in a wide range of application, including highly activecatalysts [1], magnetic materials, quantum dots andminiaturization of electronic devices and nonlinear opticalmaterials [2-5]. In this work, we investigated the preparationof new polyimide (PI)-silver nanocomposite by convenientultraviolet irradiation technique at room temperature. Thesilver nanoparticles were homogeneously dispersed in the PImatrix and the PI–silver nanocomposites exhibited anultraviolet–visible (UV-vis) absorption peak, corresponding tothe characteristic surface plasmon resonance of silverparticles.Polyimide 6 as a source of polymer was synthesized by theone-step synthesis of polyimide from polycondensationreaction of 4,4'-diamino chalcone 4 with pyromelliticanhydride 5 in m-cresol solution and in the presence of isoquinolineas a base (Figure 1).Figure 2. SEM image of polyimide-silver nanocomposite 6aIn summery in this work, a polyimide-silver nanocompositecontaining chalcone moieties was successfully prepared by aconvenient reduction of silver by ultraviolet irradiationtechnique. From the SEM and XRD investigations, the silvernanopaticles homogeneously dispersed in the PI matrix. In theUV–vis absorption spectra of the PI-silver nanocomposite, theabsorption peak due to the surface plasmon resonance of silverparticles was observed at 418 nm. Because of the goodthermal properties and Due to presence chalcone moieties inpolymer backbone, these silver/PI nanocomposites can bephotosensitive and has the potential for use inmicrofabrication of conductive components in microelectronicindustry.*Corresponding author: k-faghihi@araku.ac.irFigure 1. Synthetic route of PI 6The soluble PI–silver nanocomposite was prepared by usingultraviolet irradiation is presented. A precursor of the silverparticles AgNO3 was used. The XRD pattern of the solublePI-silver nanocomposite 6a. shows five diffraction peaks inthe XRD patterns of samples 6a widen greatly, indicating theformation of the nanometer scale of silver particles in the PIsilvernanocomposite. Figure 1 containing diffraction signalsat 2h values of 38.2 º, 45.3 º, 66.1 º, 75.5 º and 83.7 attributedto the diffraction planes (1 1 1), (2 0 0), (2 2 0), (3 1 1) and (22 2) of fcc silver nanoparticles confirming the presence ofsilver nanoparticles in the nanocomposites. The SEMmicrograph of the PI-silver nanocomposite 6a in figure 1shows that the silver nanoparticles were homogeneouslydispersed in polyimide matrix (Figure 1).0B[1] Lewis, L.N. Chemical Review 93: 2693-2730 (1993).[2] Huang, J.C., Qian, X.F., Yin, J., Zhu, Z.K. and Xu, H.J.Materials Chemistry and Physics 69: 172-175 (2001).[3] Robin, E.S. and David, W.T. Chemistry Material 16: 1277-1284 (2004).[4] Henglein, A. Chemical Review 89: 1861-1873 (1989)[5] Kobayashi, T. and Iwaki, M. Surface and CoatingsTechnology: 196, 211-215 (2005).6th Nanoscience and Nanotechnology Conference, zmir, 2010 721