There's something in the air … A nanocomposite consisting of well-dispersed SnO(2) and Pt nanoparticles on reduced graphene oxide (see the high-resolution TEM image) exhibited very high responses to hydrogen at concentrations between 0.5 and 3% in air, with response times of 3-7 s and recovery times of 2-6 s. The sensor was prepared by a straightforward microwave-assisted non-aqueous sol-gel approach.

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Scheme 1 . Procedure of iron oxide/reduced graphene oxide composites fabrication.

Es liegt was in der Luft …︁ Ein Nanokomposit aus dispergierten SnO2‐ und Pt‐Nanopartikeln auf reduziertem Graphenoxid (siehe TEM‐Bild) zeigt ein sehr starkes Ansprechverhalten auf Wasserstoff in Konzentrationen zwischen 0.5 und 3 % in der Luft, bei Ansprechzeiten von 3–7 s und Erholungszeiten von 2–6 s. Der Sensor wurde über einen einfachen mikrowellenunterstützten nichtwässrigen Sol‐Gel‐Prozess hergestellt.

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Among the many industrial and research level applications of fluorides like microelectronics, polymers, agronomy, imaging, dental composites, uranium enrichment processes or catalysis, there is a recent and growing interest for these ionic compounds in the field of energy storage and conversion. Li-ion technology in particular, has been attracted to fluorides due to the possibility of morethan-one electrode reaction. In fact, these reactions can potentially enhance the energy stored in commercial cells (conversion reactions). By reaction with lithium, transition metal fluorides such as MnF 3 , FeF 3 , CoF 3 or CuF 2 , can be reduced to the respective zero valent metal/LiF mixture with resulting high theoretical capacities ranging from 3 to 4.2 times the amount currently delivered by commercial LiFePO 4 (170 mAh g-1). Since, in practice, the most of the research efforts are being put into iron trifluoride due to chemical (relatively mild synthesis conditions), electrochemical (lower polarization than MnF 3 for example) and environmental (Fe is more environmentally friendly than Co) reasons, in this review we will focus on the electrochemistry, synthesis strategies and amelioration techniques for the high oxidation state ferric fluoride and its derivatives.

A simple microwave-assisted fluorolytic sol-gel synthesis of 30 nm sized FeF3 nanocrystals supported on partially reduced graphene oxide is reported. The as-fabricated nanostructures used as positive electrodes in Li-ion batteries show capacity retention as high as 150 mA h g(-1) even after having sustained repeated charge-discharge cycles.