Nickel nanoparticle-decorated reduced graphene oxide/WO₃ nanocomposite – a promising candidate for gas sensing

• Ilka Simon,
• Alexandr Savitsky,
• Rolf Mülhaupt,
• Vladimir Pankov and
• Christoph Janiak

Beilstein J. Nanotechnol. 2021, 12, 343–353, doi:10.3762/bjnano.12.28

• mbar for several days. Then rGO was dispersed with Ni(COD)2 in [BMIm][NTf2] to gain 0.5 wt % metal nanoparticles and 0.5 wt % rGO. In order to stir the reaction mixture during the microwave decomposition, 0.5 wt % rGO could not be exceeded. The obtained nanomaterial was analyzed using powder X-ray

• mg, 0.178 mmol) and rGO (10 mg) were suspended for 2 h in the dried and deoxygenated IL (2 g [BMIm][NTf2]) before microwave decomposition (230 °C, 10 min, 50 W) to obtain a dispersion of 0.5 wt % of Ni nanoparticles on rGO in ionic liquid. Preparation of WO3 nanopowder Tungsten oxide nanopowder was

• achieved [47]. Thermally reduced graphene oxide was tested before with different metals in ionic liquids [48][49]. The decoration of nanoparticles on rGO can be achieved in situ or by mixing previously prepared solutions [50]. Here, we chose the ionic liquid [BMIm][NTf2] for an in situ microwave

Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids

• Ilka Simon,
• Julius Hornung,
• Juri Barthel,
• Jörg Thomas,
• Maik Finze,
• Roland A. Fischer and
• Christoph Janiak

Beilstein J. Nanotechnol. 2019, 10, 1754–1767, doi:10.3762/bjnano.10.171

• conversion values. IL-free, precipitated NiGa nanoparticles achieve conversion values of over 90% and selectivity of 100% towards alkene over three runs. Keywords: ionic liquids; microwave decomposition; nickel/gallium nanoparticles; semihydrogenation catalysis; soft wet-chemical synthesis; Introduction

• deficient with a ratio of 28:72 atom % (±2 atom %). After 24 h of dispersion, the initial 1:1 ratio led to almost exclusively NiGa nanoparticles. Thus, a dispersion time of 24 h before microwave decomposition is needed to gain phase-pure NiGa nanoparticles without Ga(Ni) nanoparticles as by-products. We

• for a chosen time (30 min, 1 h, 12 h or 24 h) in the dried and desoxygenated IL or PC before microwave decomposition to gain 0.5–1.5 wt % dispersion of the nanoparticles. All precursor dispersions were decomposed at a power of 50 W to a temperature of 230 °C for a chosen time (10 min, 20 min, 30 min

Microwave assisted synthesis and characterisation of a zinc oxide/tobacco mosaic virus hybrid material. An active hybrid semiconductor in a field-effect transistor device

• Shawn Sanctis,
• Rudolf C. Hoffmann,
• Sabine Eiben and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2015, 6, 785–791, doi:10.3762/bjnano.6.81

• ranging up to several hundred nanometres in size, was observed in the presence of higher amounts of the base. In order to gain insight into the microwave decomposition process of the molecular precursor, the microwave decomposition process was studied in the absence and presence of the base TEAOH using

• of undesirable precipitates of zinc oxide aggregates, in a very similar way as addition of excess base TEAOH does. Thus it can be concluded that the microwave decomposition reaction has to be fine tuned in order to obtain pure precipitates of the desired nanoscale ZnO product. A comprehensive

• materials with functional properties that can be implemented into future device applications. Schematic representation of the microwave decomposition pathway of the zinc oximato precursor in the presence of TEAOH as a base based on NMR spectroscopy. Note that the water ligands are omitted in the starting