Abstract
Anhydrous ruthenium dioxide powder spontaneously decomposes to ruthenium metal on irradiation in a 1000 W domestic microwave oven to form microwires of about 5–30 μm diameter and up to several millimetres in length. Localised differences in temperature during irradiation and arcing close to the material lead to the assembly of wire structures with different morphologies and dimensions. Nanorods (250 nm diameter) of metal/oxide material are also observed to form emanating from the spine of some wires.
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