Facile and green synthesis of well-dispersed Au nanoparticles in PAN nanofibers by tea polyphenols

Abstract

The green natural compounds, tea polyphenols (TP), were introduced to synthesize well-dispersed Au nanoparticles (AuNPs) in polyacrylonitrile (PAN) nanofibers by combining an in situ reduction approach and electrospinning technique. The AuNPs were firstly synthesized in aqueous solution to test the reducibility of the TP. Then, the well-dispersed AuNPs in PAN nanofibers were obtained by an in situ reduction approach and electrospinning technique. Fourier transform infrared spectroscopy (FTIR) was utilized to confirm the reducibility of TP. The transmission electron microscopy (TEM) and the ultraviolet-visible spectroscopy (UV-Vis) demonstrated the formation of AuNPs and their morphology. Surprisingly, compared with the AuNPs in aqueous solution, the AuNPs in PAN nanofibers via electrospinning were much smaller and well-dispersed and it was attributed to the stabilization effect of PAN through the chelating effect between gold and cyano groups. Apart from the reducibility effect, TP also served as a stabilizer together with PAN to prevent the aggregation of AuNPs effectively, which were testified by X-ray photoelectron spectroscopy (XPS) results.

Synthesis of silver nanoparticles in electrospun polyacrylonitrile nanofibers using tea polyphenols as the reductant

“…2). Our previous work found that as consists of multiple hydroxyls, TP can chelate with the Ag ions and the chelated Ag ions can be reduced into Ag 0 atoms in situ, contributing to forming smaller and uniform AgNPs [39]. It is believed that the prepared AgNPs in the present approach were mainly reduced by TP, which will be discussed in the following work.…”

Improvement in electrocatalytic activity of oxygen reduction reaction of electrospun carbon nitride/polyacrylonitrile nanofibers by addition of carbon black and Nafion® fillers

“…Pyrrolic N is found to be 29% of total N content in CN x /PAN/CB/Nafion ® nanofibers. The presence of peak in CN x /PAN/CB/Nafion ® nanofibers at 391.1 eV is attributed to nitrile peak [24]. Nitrile N content is found to be 25% out of total N content in CN x /PAN/CB/ Nafion ® nanofibers.…”

Single-step green synthesis and characterization of gold-conjugated polyphenol nanoparticles with antioxidant and biological activities

“…[35][36][37] Polyphenols such as EGCG demonstrated to be efficient ligands for metal ions and multiple phenolic hydroxyls are able to bind Au 3+ ions by forming stable chelating rings. As a consequence of complexation, a redox reaction occurs, and the chelated Au 3+ ions are reduced to Au 0 atoms in situ, while a part of the phenolic hydroxyls is simultaneously oxidized to corresponding quinone.…”