The convenient preparation of stable aryl-coated zerovalent iron nanoparticles

• Olga A. Guselnikova,
• Andrey I. Galanov,
• Anton K. Gutakovskii and
• Pavel S. Postnikov

Beilstein J. Nanotechnol. 2015, 6, 1192–1198, doi:10.3762/bjnano.6.121

• chemistry is proposed. Surface-modified zerovalent iron NPs (ZVI NPs) were prepared by simple chemical reduction of iron(III) chloride aqueous solution followed by in situ modification using water soluble arenediazonium tosylate. The resulting NPs, with average iron core diameter of 21 nm, were coated with

• analysis were performed in order to characterize the resulting material. Keywords: arenediazonium salts; chemical reduction; covalent modification; surface-modified nanoparticles; zerovalent iron nanoparticles; Introduction Functionalized magnetic nanoparticles (NPs) have aroused great interest recently

• methods for zerovalent iron (ZVI) NP synthesis is chemical reduction. A variety of different approaches have been employed to protect this sensitive material from oxidation, where commonly used methods include coating with carbon [19][22], silica [23], noble metals and oxides [24][25][26], or the

Palladium nanoparticles anchored to anatase TiO₂ for enhanced surface plasmon resonance-stimulated, visible-light-driven photocatalytic activity

• Kah Hon Leong,
• Hong Ye Chu,
• Shaliza Ibrahim and
• Pichiah Saravanan

Beilstein J. Nanotechnol. 2015, 6, 428–437, doi:10.3762/bjnano.6.43

• photoactivity. There are several synthesis methods available for preparing plasmonic photocatalysts, namely photodeposition [3][30][31], hydrothermal [4][32][33][34], ion exchange [35][36], chemical reduction [25][37][38], physical vapour deposition [27][39][40], and deposition–precipitation [41][42][43]. Among

The impact of the confinement of reactants on the metal distribution in bimetallic nanoparticles synthesized in reverse micelles

• Concha Tojo,
• Elena González and
• Nuria Vila-Romeu

Beilstein J. Nanotechnol. 2014, 5, 1966–1979, doi:10.3762/bjnano.5.206

• the chemical reduction rate, but also on the intermicellar exchange rate. Furthermore, intermicellar exchange causes the accumulation of slower precursors inside the micelles, which favors chemical reduction. As a consequence, slower reduction rates strongly correlate with the number of reactants in

• channel between them. When one of the two metal salts ([AuCl4]−or [PtCl6]2− for the preparation of Au/Pt particles) and the reducing agent (e.g., hydrazine) are located in the same micelle, the chemical reduction takes place inside the reverse micelle to obtain metal atoms (Au or Pt). That is, the

• kex was used in this investigation (). Chemical reduction rates Due to the redistribution of material between the micelles, one metal salt and the reducer can be located inside the same micelle in order for chemical reduction to take place. The reduction potentials of the two metal salts, [AuCl4]− and

Highly NO₂ sensitive caesium doped graphene oxide conductometric sensors

• Carlo Piloto,
• Marco Notarianni,
• Mahnaz Shafiei,
• Elena Taran,
• Dilini Galpaya,
• Cheng Yan and
• Nunzio Motta

Beilstein J. Nanotechnol. 2014, 5, 1073–1081, doi:10.3762/bjnano.5.120

• . We attribute this drop to the chemical reduction of the GO caused by the Cs2CO3 that tends to decrease the work function as observed by [55][59][60][61]. This result suggests that doped GO may have good performance as a gas sensing material. XPS survey analysis of the GO (Figure 3a, blue line

Enhancement of photocatalytic H₂ evolution of eosin Y-sensitized reduced graphene oxide through a simple photoreaction

• Weiying Zhang,
• Yuexiang Li,
• Shaoqin Peng and
• Xiang Cai

Beilstein J. Nanotechnol. 2014, 5, 801–811, doi:10.3762/bjnano.5.92

• efficient electron relay between the photoexcited EY and the loaded Pt co-catalyst, which shows an AQY of 4.15% under visible light irradiation. In these works, RGO was obtained by a chemical reduction of GO with hydrazine or sodium borohydride as a reductant. Graphene, an atom-thick two-dimensional (2D

• -RGO/Pt produced by chemical reduction methods in the literature [19][20]. A possible mechanism is discussed. Results and Discussion The effect of irradiation time on the performance of RGOx Figure 1 shows UV–vis spectra of GO and RGOx solution. The peak at 232 nm is due to the C=C bond in an aromatic

Thermal stability and reduction of iron oxide nanowires at moderate temperatures

• Annalisa Paolone,
• Marco Angelucci,
• Stefania Panero,
• Maria Grazia Betti and
• Carlo Mariani

Beilstein J. Nanotechnol. 2014, 5, 323–328, doi:10.3762/bjnano.5.36

• method [25] that allows for a good control over the size of the nanoparticles [26]. The characterization was carried out as a function of the annealing temperature in order to assess the thermal stability of the NWs and the temperatures, above which a chemical reduction of the Fe ions takes place

• . Thermogravimetry measurements distinctly show the mass reduction due to oxygen loss, and infrared transmittance and core-level photoemission measurements allow to follow the reduction process of the iron ions at different temperatures, showing the chemical reduction to Fe3O4 starting at moderate temperatures

• either shape or morphology in the bundled structure. Thus, the thermal treatment causes a chemical reduction, while not affecting the structure of the assembly, which renders the NWs a stable system for potential use in batteries, even after heating. We underline that heating at 650 K is by far a much

In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation

• Eva-Maria Steyskal,
• Stefan Topolovec,
• Stephan Landgraf,
• Heinz Krenn and
• Roland Würschum

Beilstein J. Nanotechnol. 2013, 4, 394–399, doi:10.3762/bjnano.4.46

• different behavior has to be assigned to the strongly different types of surface states originating from the preparation, which is a chemical reduction process for the commercial Pt powder, whereas dealloying takes place under strongly oxidizing conditions. In fact, as shown by Viswanath et al. [18