An array of Bi2S3 nanowires on tungsten foil (see image), in which the long axis of the wires is perpendicular to the W substrate, is prepared by a hydrothermal process without the aid of template or catalyst. The semiconducting Bi2S3 nanowires on the metallic tungsten substrate are covered with a metal electrode to form a metal/semiconductor/metal sandwich, which yields a back-to-back Schottky diode.
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Bao et al. (2008) studied this question.
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