Synthesis of Conductive PPy/SiO₂ Aerogels Nanocomposites by In Situ Polymerization of Pyrrole

Abstract

Electrical conductive nanocomposite aerogels were synthesized throughin situoxidative polymerization of pyrrole (Py) using ammonium persulfate (APS) as an oxidizing agent in SiO2gels. The effect of Py concentration on the electrical conductivity and physical and morphological properties of aerogels SiO2/PPy was evaluated. B.E.T. analysis indicated that the surface area of the composite SiO2/PPy decreases with increasing concentration of Py. CHN analysis showed an increase in the amount of PPy, from 13 wt.% to 23 wt.%, with increasing concentration of pyrrole synthesis. FTIR-ATR analysis of the composites revealed bands in the region of 1500–1400 cm−1, indicating the presence of the conductive polymer in the silica aerogel as well as the characteristic bands of Si-O-Si and Si-OH covalent bonds. TEM micrographs revealed the presence of particles of PPy with the increased size of the nanoparticles. The composites were successfully applied as passive components, in RC circuits, for low-pass frequency filters. The filters exhibited a cutoff frequency at approximately 435 Hz. The aerogels obtained in this work exhibited suitable electrical conductivity for use in various other applications in electronics.

Ex Situ Fabrication of Polypyrrole-Coated Core-Shell Nanoparticles for High-Performance Coin Cell Supercapacitor

“…Due to such structural characteristics, PPy can achieve thermal stability up to 150 °C. Therefore, various studies on the synthetic methods of PPy have been made through the chemical oxidation polymerization and the electrochemical polymerization [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ].…”

“…Proper control of the shape of the PPy is very important for high performance in a variety of applications, such as supercapacitors, chemical sensors, solar cells (SCs), fuel cells (FCs) and so forth [ 3 , 4 , 5 , 6 , 7 , 8 ]. When PPy is made of nanomaterials, it has following advantages over bulk materials: (1) higher surface area; (2) better reactivity; (3) enhanced electrical conductivity [ 1 , 2 , 4 , 6 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Studies on the synthesis of nanomaterials with various shapes such as nanorods (NRs), nanoparticles (NPs), and nanotubes (NTs) have been carried out using template-mediated methodologies [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”

“…Among the various nanomaterials, the core-shell is very suitable as a stable electrode material because the Si core can protect the CP shell from swelling and shrinkage problems [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. In addition, the high surface area of the Si cores enable rapid adsorption/desorption of electrolyte ions within the electrodes [ 19 ].…”

Ni(OH)2 Aerogels Incorporated with Polypyrrole as Electrodes for Supercapacitors

“…This behavior can be explained by the polymerization of the conducting polymer on the nanoparticles in smaller pores. 32 During calcination, the hydroxyl groups are removed, which causes important changes in the structure of the aerogel depending on the temperature at which it is submitted. Up to 200°C, the pores of the structure still remain, but the hydroxyl groups were totally removed.…”

Thermal Stability and Crystallinity Study of Polystyrene/SiO<sub>2</sub> Nano-Composites Synthesis via Microwave-Assisted <i>In Situ</i> Polymerization

“…Among the inorganic materials, SiO 2 is viewed as being very important among both biological and synthetic materials. The silica has extremely large specific surface area, which enhances the connection between the filler and the polymer matrix [6]. It is well known that the thermal stabilities of the polymeric materials could be improved by addition of inorganic nano-fillers [7].…”