Abstract
Nanocomposites of tetraaniline (TAN) nanostructures/silver nanoparticles (Ag NPs) were synthesized by an interfacial polymerization method using N-phenyl-1, 4-phenylenediamine (NPPD), AgNO3 and ammonium persulphate (APS) as monomer, oxidizing agent in immiscible solvent toluene–water respectively. The structure and morphology of the as-prepared TAN and Ag NPs were investigated by UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and thermogravimetry (TG). The results of FTIR spectroscopy confirmed the formation of TAN and Ag NPs and those of XRD showed the presence of the face centred cubic (fcc) phase of Ag NPs. The FESEM and TEM images gave direct evidence that Ag NPs stabilized with the TAN nanostructures. TGA indicated the enhanced thermal stability of the nanocomposites (NCs). The catalytic activity of TAN/Ag NCs was investigated for the model reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of excess sodium borohydride.
Highlights
Noble metal nanoparticles have received signi cant attention due to their numerous technological applications such as catalysis, medicine, electronics, and sensors.[1,2,3] In particular, Ag nanoparticles have been studied because of their optoelectronic properties,[4,5,6] which make them useful in numerous applications such as electronics, catalysis, and antimicrobial studies.[7,8] To realize these applications, the size of the Ag nanoparticles must be below 100 nm but at this scale, the nanoparticles aggregate due to their high volume-to-surface ratio[9] and result in irregular macrostructures, which can limit their applications
Surface morphology was examined by scanning electron microscopy (SEM) using JEOL-JSM-6610 LV equipped with an electron probe-micro analyzer and field emission scanning electron microscopy (FESEM) (JSM-7500F)
Thermogravimetric analysis (TGA) was carried out using a Shimadzu thermogravimetric analyzer (DTG-60H) with temperatures ranging from 25 to 800 C under a stable N2 ow (50 ml minÀ1) and with a heating rate set at 10 C minÀ1
Summary
Noble metal nanoparticles have received signi cant attention due to their numerous technological applications such as catalysis, medicine, electronics, and sensors.[1,2,3] In particular, Ag nanoparticles have been studied because of their optoelectronic properties,[4,5,6] which make them useful in numerous applications such as electronics, catalysis, and antimicrobial studies.[7,8] To realize these applications, the size of the Ag nanoparticles must be below 100 nm but at this scale, the nanoparticles aggregate due to their high volume-to-surface ratio[9] and result in irregular macrostructures, which can limit their applications. The immobilization of silver nanoparticles on different supports including polymers[15] and inorganic supports such as metal oxides,[16] carbon,[17] and alumina[18] can be an alternative choice for delivering better efficiencies and ease of separation from the reaction medium.[19]
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