Spectroscopy-based study on the interaction between gold nanoparticle and poly(vinylpyrrolidone) molecules in a non-hydrocolloid

Abstract

The study of the interaction between poly(vinylpyrrolidone) (PVP) and gold (Au) nanoparticles (NPs) in a colloid is of special interest for possible applications in the field of catalysis, biosensing, and biomedicine. A strong optical absorption arising from Au NPs at 532 nm in Au-PVP colloids is ascribed to surface plasmon resonance. The X-ray photoelectron spectroscopic results confirm reduction of the Au 3+ ion to Au 0 . A noticeable decrease in the binding energies of the Au4f doublet peak of the Au NP with PVP as compared to the bulk Au atom implies interfacial interaction between the Au NP and PVP molecules. A marked enhancement in vibrational band intensities of C-H (2,961, 2,936, and 2,872 cm −1 ) stretching, C-N (1,463 cm −1 ) stretching, and CH 2 (1,381 cm) bending vibrations in the pyrrolidone ring of PVP molecules reveals a charge-transfer-type interaction between the PVP molecules and surface of the Au NP. A significant decay of the emission band intensity (approximately 85%) in the π ← π* band of the PVP molecules at approximately 392 nm in the presence of Au NPs suggests non-bonding (n) electron transfer from the O atom of the pyrrolidone ring of PVP molecules to the electron-deficient Au NP. A negative zeta potential of (−) 15.2 mV reveals accumulation of n-electrons of the O atom of the carbonyl group of PVP molecules on the surface of the Au NP. Transmission electron microscopic images of PVP-capped Au NPs corroborate the spectroscopic results.

Carrier recombination in sonochemically synthesized ZnO powders

“…2 can be explained by assuming that a molecule of IPA is absorbed on the surface of ZnO and then interacts with the surface of the grain via O atoms. It is interesting that the similar conclusion can be drawn from the data describing the synthesis of gold and silver nanoparticles passivated by PVP [44][45][46][47].…”

Inquiring the photocatalytic activity of cuprous oxide nanoparticles synthesized by a green route on methylene blue dye

“…Disappearance of C-H bending vibration of heterocycle ring of MB in presence of oxide NPs also suggests that surface interaction arises between these two entities. In an experiment, Behera and Ram [25] have ascribed a small red shift of 5 cm -1 in the C=O stretching vibration in presence of Au NPs to a weak interaction between poly(vinyl pyrrolidone) polymer and Au surface via the O-atom of the pyrrolidone ring.…”

“…Further we studied PL quenching of MB molecules in presence of an oxide quencher using the well-known SternVolmer equation [25,34] which can be written as:…”

Gold nanoparticles for sensitive detection of hydrogen peroxide: a simple non-enzymatic approach

“…A weak coordinative bond between oxygen atoms in carbonyl group of PVP and metallic Au atoms is the likely cause for the interaction [52][53][54]. Behera et al [49,55] and several others [52,54,56] reported a small shift of C=O stretching vibrations when Au NPs are stabilized by PVP. Earlier reports based on other noble metal NPs such as silver (Ag) and palladium (Pd) account for this carbonyl group shift.…”