Synthesis and characterization of polyprrole–silica nanocomposites with study of their physical properties

سال انتشار: 1389
محل انتشار: همایش منطقه ای شیمی
کد COI اختصاصی: MIAUCHEMISTRY01_113
زبان مقاله: انگلیسی
تعداد مشاهده: 301

نویسندگان

Department of Chemistry, Islamic Azad University-Tabriz Branch, Tabriz, Iran - Islamic Azad University-Bostanabad Branch, Bostanabad, Iran

Gh. Shahverdizadeh

Department of Chemistry, Islamic Azad University-Tabriz Branch, Tabriz, Iran

N. Mokari

Department of Chemistry, Islamic Azad University-Tabriz Branch, Tabriz, Iran

چکیده

Nanocomposites are a special class of materials having unique physical properties and wid application potential in diverse areas. Novel properties of nanocomposites can be obtained by the successful combination of the characteristics of parent constituents into a single material.Encapsulation of inorganic nanoparticles inside the shell of conducting polymers is the most popular and interesting aspectof nanocomposites synthesis. These materials differ from both the pure polymers and the inorganic nanoparticles in some of the physical and chemical properties. Among conducting polymers, polypyrrole is easily oxidized, water- soluble, commercially available, possesses environmental stability and good reddox properties. In this research a serious of nanocomposites of polypyrrole (PPy) encapsulating silica (SiO2) with nanometer size was prepared by the oxidating pyrrole with ferric chloride (FeCl3) in the presence of SiO2 nanoparticles in different dopants. The obtained compounds were characterized by Fourier-transform infrared (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques. The conductivity of nanocomposites was also investigated by four-point probe instrument. The optimum molar ratio of pyrrole:SiO2 and the best dopant with high conductivity was also found. The obtained results showed that HCl is the best dopant agent and the maximum conductivity of PPy-SiO2 is high has reached 18.02Cm-1.The size and shape of neat SiO2 nanoparticles, PPy and PPy-SiO2 nanocomposites were detrmined by SEM images. TGA results showed that the PPy-SiO2 nanocomposites have slightly higher thermal stability than neat PPy. TGA, XRD,and FT-IR data also confirmed that SiO2 nanoparticles are encapsulated by polypyrrole.

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