Facile in situ growth of highly monodispersed Ag nanoparticles on electrospun PU nanofiber membranes: Flexible and high efficiency substrates for surface enhanced Raman scattering

• Published in: Applied surface science 2014-07, Vol.308, p.396-401
• Main Authors: Amarjargal, Altangerel, Tijing, Leonard D., Shon, Ho Kyong, Park, Chan-Hee, Kim, Cheol Sang
• Format: Article
• Language: English
• Subjects: Ag nanoparticles; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Electrospun PU nanofibers; Ethylene glycol; Exact sciences and technology; Physics; SERS
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2014.04.188

•Highly monodisperse Ag NPs have been successfully grown on electrospun PU nanofibers by means of simple polyol technique.•The function of polyol immersion medium was not only as a reducing agent, but also it was confirmed to have a significant effect on the growth density of silver particles on support fibers.•The present PU–Ag(EG) nanofibrous membranes may be a potential candidate as a highly sensitive SERS substrates. In this study, by utilizing a two-step route of electrospinning and polyol immersion, in the absence of any surfactant or sensitizing and stabilizing reagent, a well-distributed assembly of Ag NPs on the electrospun polyurethane (PU) nanofibers was successfully fabricated through a simple and controllable manner. Based on the FE-SEM, XRD and FT-IR analyses, the polyol medium plays an important role in the growth of highly monodispersed Ag NPs, wherein the hydroxyl group of ethylene glycol (EG) can be bridged to the amide group on the surface of the PU nanofibers through intermolecular hydrogen bonds. Fabrication of a polymer fibrous membrane effectively attached/decorated with noble metal NPs, which is essential as flexible and high efficiency substrates for SERS application where the molecule analytes are directly adsorbed on their surfaces is important, could be realized by the present electrospun PU–Ag(EG) nanofibers, employing 4-mercaptobenzoic acid (4-MBA) as probe molecules.