PVP-Coated Iron Nanocrystals:  Anhydrous Synthesis, Characterization, and Electrocatalysis for Two Species

Abstract

We report the synthesis of Fe nanocrystals (approximately 9 nm) in an anhydrous media, formamide, using poly(N-vinyl-2-pyrrolidone) (PVP) as a protecting agent. The morphology, structure, and composition of the PVP-coated Fe nanocrystals are studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and FT-Raman spectroscopy. The surface properties of the PVP-coated Fe nanocrystals are studied by electrochemistry and micro-surface-enhanced Raman scattering (mSERS) using pyridine as a probing molecule. The PVP-coated Fe nanocrystals, when immobilized on an electrode substrate, display very good electrocatalytic activities in the selective reduction of H2O2 in the presence of oxygen and in the oxidation of NO.

Polyvinyl pyrrolidone-modified Pd/Fe nanoparticles for enhanced dechlorination of 2,4-dichlorophenal

“…2, the peaks of modified Pd/Fe NPs are weaker than that of pristine one. This is consistent with the results reported by Guo et al and Chen et al [27,28]. Fig.…”

“…In general, Pd/Fe NPs represented lower dechlorination activities under alkaline or acidic conditions, especially at pH value larger than 7.0 (such as pH = 10.0), dechlorination efficiencies were significantly reduced from the alkaline condition. Because the ferrous ions Fe 2+ dissolved in reaction system might collided with hydroxyl ions, followed by the formation of ferrous hydroxide precipitation, resulting in occupation of reactive sites by the precipitates and decrease in dechlorination efficiency [27]. At pH lower than 7, excessive hydrogen gas bubbles produced by the erosion of ZVI NPs might largely prevent 2,4-DCP from approaching the modified Pd/Fe NPs, and hence resulting in the decrease of removal efficiency.…”

In vitro biocompatibility of nanoscale zerovalent iron particles (NZVI) synthesized using tea polyphenols

“…The cytotoxicity assays were run and any group with a p value less than 0.05 was considered significant. The reaction between Fe(NO 3 ) 3 and tea extract was instantaneous and the color of the reaction mixture changed from yellow to dark brown as shown in the inset of Fig. Understanding properties of nanomaterials obtained through different routes is still a challenge.…”

“…Tea extract preparation: about 2 grams of tea powder (Red label from Tata, India Ltd. 99%) were extracted in 100 mL hot water and were then used to carry out the reaction with 0.1 N Fe(NO 3 ) 3 . The different compositions were prepared at room temperature and are shown in Table 1.…”

Preparation and Characterization of TiO2 Coated Fe Nanofibers for Electromagnetic Wave Absorber

“…Fe nanofibers easily undergo surface oxidation, they need to prevent the re-oxidation of the Fe nanofibers. [13][14] As above, in order to solve the problem, we attempted reduction of TiO 2 coated Fe 2 O 3 nanofibers based on Ellingham diagram. A dielectric TiO 2 coated Fe nanofibers were shown in Figures 5(c) and (d).…”