Latest Publications

Senso and Actuators B: Chemical 2018

DOI: 10.1016/j.snb.2017.07.200 pdf_format

In this work the gas sensing properties of nanosensors fabricated by a “bottom-up” approach in a FIB/SEM system based on a single Pd modified ZnO nanowire is investigated in detail. Synthesis, surface doping and functionalization of ZnO nanowires (NWs) with Pd (Pd/ZnO) in a one − step process were performed during electrochemical deposition. The influence of the diameter of the NW, the operating temperature and the humidity are studied in detail and corresponding sensing mechanisms are proposed. An increase in the gas response by a decrease of the NW diameter was observed. Also, by increasing the operating temperature to 200 °C an enhancement in the hydrogen gas response of about 3.5 times (from ≈400 to 1440 to 100 ppm) was obtained and was attributed to the increased catalytic properties of the Pd nanoparticles (NPs). However, long-term investigations revealed a lowered signal stability of the nanosensor oper...

ACS Catalysis 2017, 7 (7), 4253–4264

DOI: 10.1021/acscatal.7b00911

Experimental and theoretical mechanistic studies on the Cu(OTf)2-catalyzed hydroamination reaction of terminal allenes with secondary amines reveal that in situ generated cationic Cu(I) is the catalytically active species and explain the observed regio- and stereoselectivity for the unbranched E product. Insight into the structure of the relevant transition states allowed the generalization of this methodology to allenamides and N-allenylcarbamates under unprecedentedly mild and functional-group-tolerant conditions. Chelation effects by the amide oxygen in addition to electronic effects explain the high innate reactivity of this class of substrates.

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