Abstract
Self-organized straight nanowires ofWO3 have been epitaxially grown on muscovite mica in low super-saturation conditions.Morphology, structure and chemical composition of the prepared nanostructures have beeninvestigated by scanning electron microscopy (SEM), x-ray diffraction (XRD) and x-rayphotoelectron spectroscopy (XPS). SEM permits us to observe nanowire networks andsubstrate electron channeling patterns (ECP) simultaneously and thus to determinecrystallographic direction of nanowire growth. The experimental results show that straightWO3 nanowires are orientated preferentially parallel to two of three high symmetrycrystallographic directions of mica [100] and [110] or [100] and . XRD and XPS measurements indicated self-assembly of very thin nanowires of hexagonaltungsten bronze in the first stage of growth followed by the formation of stoichiometricWO3. The growth mechanism has been studied as a function of different preparation conditionswith special focus on the role of potassium ions present on the mica surface. Based onobtained results a growth model of tungsten oxide nanowires on mica is proposed.
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