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Vertically oriented single-crystalline Co3O4 nanowalls (see Figure) have been successfully fabricated by directly heating Co foil in air using a hot plate. The morphologies of the Co3O4 nanowalls can be controlled by varying the growth temperature and time. The Co3O4 nanowalls show promising field-emission performance that is comparable to many other nanomaterials.
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Yu et al. (2005) studied this question.
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